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diff --git a/ldmicro/pic16.cpp b/ldmicro/pic16.cpp
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+++ b/ldmicro/pic16.cpp
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+//-----------------------------------------------------------------------------
+// Copyright 2007 Jonathan Westhues
+//
+// This file is part of LDmicro.
+//
+// LDmicro is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// LDmicro is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with LDmicro. If not, see <http://www.gnu.org/licenses/>.
+//------
+//
+// A PIC16... assembler, for our own internal use, plus routines to generate
+// code from the ladder logic structure, plus routines to generate the
+// runtime needed to schedule the cycles.
+// Jonathan Westhues, Oct 2004
+//-----------------------------------------------------------------------------
+#include "linuxUI.h"
+#include <math.h>
+#include <stdio.h>
+#include <setjmp.h>
+#include <stdlib.h>
+
+#include "ldmicro.h"
+#include "intcode.h"
+
+// not complete; just what I need
+typedef enum Pic16OpTag {
+ OP_VACANT,
+ OP_ADDWF,
+ OP_ANDWF,
+ OP_CALL,
+ OP_BSF,
+ OP_BCF,
+ OP_BTFSC,
+ OP_BTFSS,
+ OP_GOTO,
+ OP_CLRF,
+ OP_CLRWDT,
+ OP_COMF,
+ OP_DECF,
+ OP_DECFSZ,
+ OP_INCF,
+ OP_INCFSZ,
+ OP_IORWF,
+ OP_MOVLW,
+ OP_MOVF,
+ OP_MOVWF,
+ OP_NOP,
+ OP_RETFIE,
+ OP_RETURN,
+ OP_RLF,
+ OP_RRF,
+ OP_SUBLW,
+ OP_SUBWF,
+ OP_XORWF,
+} Pic16Op;
+
+#define DEST_F 1
+#define DEST_W 0
+
+#define STATUS_RP1 6
+#define STATUS_RP0 5
+#define STATUS_Z 2
+#define STATUS_C 0
+
+typedef struct Pic16InstructionTag {
+ Pic16Op op;
+ DWORD arg1;
+ DWORD arg2;
+} Pic16Instruction;
+
+#define MAX_PROGRAM_LEN 128*1024
+static Pic16Instruction PicProg[MAX_PROGRAM_LEN];
+static DWORD PicProgWriteP;
+
+// Scratch variables, for temporaries
+static DWORD Scratch0;
+static DWORD Scratch1;
+static DWORD Scratch2;
+static DWORD Scratch3;
+static DWORD Scratch4;
+static DWORD Scratch5;
+static DWORD Scratch6;
+static DWORD Scratch7;
+
+// The extra byte to program, for the EEPROM (because we can only set
+// up one byte to program at a time, and we will be writing two-byte
+// variables, in general).
+static DWORD EepromHighByte;
+static DWORD EepromHighByteWaitingAddr;
+static int EepromHighByteWaitingBit;
+
+// Subroutines to do multiply/divide
+static DWORD MultiplyRoutineAddress;
+static DWORD DivideRoutineAddress;
+static BOOL MultiplyNeeded;
+static BOOL DivideNeeded;
+
+// For yet unresolved references in jumps
+static DWORD FwdAddrCount;
+
+// As I start to support the paging; it is sometimes necessary to pick
+// out the high vs. low portions of the address, so that the high portion
+// goes in PCLATH, and the low portion is just used for the jump.
+#define FWD_LO(x) ((x) | 0x20000000)
+#define FWD_HI(x) ((x) | 0x40000000)
+
+// Some useful registers, which I think are mostly in the same place on
+// all the PIC16... devices.
+#define REG_INDF 0x00
+#define REG_STATUS 0x03
+#define REG_FSR 0x04
+#define REG_PCLATH 0x0a
+#define REG_INTCON 0x0b
+#define REG_PIR1 0x0c
+#define REG_PIE1 0x8c
+#define REG_TMR1L 0x0e
+#define REG_TMR1H 0x0f
+#define REG_T1CON 0x10
+#define REG_CCPR1L 0x15
+#define REG_CCPR1H 0x16
+#define REG_CCP1CON 0x17
+#define REG_CMCON 0x1f
+
+#define REG_TXSTA 0x98
+#define REG_RCSTA 0x18
+#define REG_SPBRG 0x99
+#define REG_TXREG 0x19
+#define REG_RCREG 0x1a
+
+#define REG_ADRESH 0x1e
+#define REG_ADRESL 0x9e
+#define REG_ADCON0 0x1f
+#define REG_ADCON1 0x9f
+
+#define REG_T2CON 0x12
+#define REG_CCPR2L 0x1b
+#define REG_CCP2CON 0x1d
+#define REG_PR2 0x92
+
+// These move around from device to device.
+static DWORD REG_EECON1;
+static DWORD REG_EECON2;
+static DWORD REG_EEDATA;
+static DWORD REG_EEADR;
+static DWORD REG_ANSEL;
+static DWORD REG_ANSELH;
+
+static int IntPc;
+
+static void CompileFromIntermediate(BOOL topLevel);
+
+//-----------------------------------------------------------------------------
+// A convenience function, whether we are using a particular MCU.
+//-----------------------------------------------------------------------------
+static BOOL McuIs(char *str)
+{
+ return strcmp(Prog.mcu->mcuName, str) == 0;
+}
+
+//-----------------------------------------------------------------------------
+// Wipe the program and set the write pointer back to the beginning.
+//-----------------------------------------------------------------------------
+static void WipeMemory(void)
+{
+ memset(PicProg, 0, sizeof(PicProg));
+ PicProgWriteP = 0;
+}
+
+//-----------------------------------------------------------------------------
+// Store an instruction at the next spot in program memory. Error condition
+// if this spot is already filled. We don't actually assemble to binary yet;
+// there may be references to resolve.
+//-----------------------------------------------------------------------------
+static void Instruction(Pic16Op op, DWORD arg1, DWORD arg2)
+{
+ if(PicProg[PicProgWriteP].op != OP_VACANT) oops();
+
+ PicProg[PicProgWriteP].op = op;
+ PicProg[PicProgWriteP].arg1 = arg1;
+ PicProg[PicProgWriteP].arg2 = arg2;
+ PicProgWriteP++;
+}
+
+//-----------------------------------------------------------------------------
+// Allocate a unique descriptor for a forward reference. Later that forward
+// reference gets assigned to an absolute address, and we can go back and
+// fix up the reference.
+//-----------------------------------------------------------------------------
+static DWORD AllocFwdAddr(void)
+{
+ FwdAddrCount++;
+ return 0x80000000 | FwdAddrCount;
+}
+
+//-----------------------------------------------------------------------------
+// Go back and fix up the program given that the provided forward address
+// corresponds to the next instruction to be assembled.
+//-----------------------------------------------------------------------------
+static void FwdAddrIsNow(DWORD addr)
+{
+ if(!(addr & 0x80000000)) oops();
+
+ BOOL seen = FALSE;
+ DWORD i;
+ for(i = 0; i < PicProgWriteP; i++) {
+ if(PicProg[i].arg1 == addr) {
+ // Insist that they be in the same page, but otherwise assume
+ // that PCLATH has already been set up appropriately.
+ if((i >> 11) != (PicProgWriteP >> 11)) {
+ Error(_("Internal error relating to PIC paging; make program "
+ "smaller or reshuffle it."));
+ CompileError();
+ }
+ PicProg[i].arg1 = PicProgWriteP;
+ seen = TRUE;
+ } else if(PicProg[i].arg1 == FWD_LO(addr)) {
+ PicProg[i].arg1 = (PicProgWriteP & 0x7ff);
+ seen = TRUE;
+ } else if(PicProg[i].arg1 == FWD_HI(addr)) {
+ PicProg[i].arg1 = (PicProgWriteP >> 8);
+ }
+ }
+ if(!seen) oops();
+}
+
+//-----------------------------------------------------------------------------
+// Given an opcode and its operands, assemble the 14-bit instruction for the
+// PIC. Check that the operands do not have more bits set than is meaningful;
+// it is an internal error if they do.
+//-----------------------------------------------------------------------------
+static DWORD Assemble(Pic16Op op, DWORD arg1, DWORD arg2)
+{
+#define CHECK(v, bits) if((v) != ((v) & ((1 << (bits))-1))) oops()
+ switch(op) {
+ case OP_ADDWF:
+ CHECK(arg2, 1); CHECK(arg1, 7);
+ return (7 << 8) | (arg2 << 7) | arg1;
+
+ case OP_ANDWF:
+ CHECK(arg2, 1); CHECK(arg1, 7);
+ return (5 << 8) | (arg2 << 7) | arg1;
+
+ case OP_BSF:
+ CHECK(arg2, 3); CHECK(arg1, 7);
+ return (5 << 10) | (arg2 << 7) | arg1;
+
+ case OP_BCF:
+ CHECK(arg2, 3); CHECK(arg1, 7);
+ return (4 << 10) | (arg2 << 7) | arg1;
+
+ case OP_BTFSC:
+ CHECK(arg2, 3); CHECK(arg1, 7);
+ return (6 << 10) | (arg2 << 7) | arg1;
+
+ case OP_BTFSS:
+ CHECK(arg2, 3); CHECK(arg1, 7);
+ return (7 << 10) | (arg2 << 7) | arg1;
+
+ case OP_CLRF:
+ CHECK(arg1, 7); CHECK(arg2, 0);
+ return (3 << 7) | arg1;
+
+ case OP_CLRWDT:
+ return 0x0064;
+
+ case OP_COMF:
+ CHECK(arg2, 1); CHECK(arg1, 7);
+ return (9 << 8) | (arg2 << 7) | arg1;
+
+ case OP_DECF:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (3 << 8) | (arg2 << 7) | arg1;
+
+ case OP_DECFSZ:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (11 << 8) | (arg2 << 7) | arg1;
+
+ case OP_GOTO:
+ // Very special case: we will assume that the PCLATH stuff has
+ // been taken care of already.
+ arg1 &= 0x7ff;
+ CHECK(arg1, 11); CHECK(arg2, 0);
+ return (5 << 11) | arg1;
+
+ case OP_CALL:
+ CHECK(arg1, 11); CHECK(arg2, 0);
+ return (4 << 11) | arg1;
+
+ case OP_INCF:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (10 << 8) | (arg2 << 7) | arg1;
+
+ case OP_INCFSZ:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (15 << 8) | (arg2 << 7) | arg1;
+
+ case OP_IORWF:
+ CHECK(arg2, 1); CHECK(arg1, 7);
+ return (4 << 8) | (arg2 << 7) | arg1;
+
+ case OP_MOVLW:
+ CHECK(arg1, 8); CHECK(arg2, 0);
+ return (3 << 12) | arg1;
+
+ case OP_MOVF:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (8 << 8) | (arg2 << 7) | arg1;
+
+ case OP_MOVWF:
+ CHECK(arg1, 7); CHECK(arg2, 0);
+ return (1 << 7) | arg1;
+
+ case OP_NOP:
+ return 0x0000;
+
+ case OP_RETURN:
+ return 0x0008;
+
+ case OP_RETFIE:
+ return 0x0009;
+
+ case OP_RLF:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (13 << 8) | (arg2 << 7) | arg1;
+
+ case OP_RRF:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (12 << 8) | (arg2 << 7) | arg1;
+
+ case OP_SUBLW:
+ CHECK(arg1, 8); CHECK(arg2, 0);
+ return (15 << 9) | arg1;
+
+ case OP_SUBWF:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (2 << 8) | (arg2 << 7) | arg1;
+
+ case OP_XORWF:
+ CHECK(arg1, 7); CHECK(arg2, 1);
+ return (6 << 8) | (arg2 << 7) | arg1;
+
+ default:
+ oops();
+ break;
+ }
+}
+
+//-----------------------------------------------------------------------------
+// Write an intel IHEX format description of the program assembled so far.
+// This is where we actually do the assembly to binary format.
+//-----------------------------------------------------------------------------
+static void WriteHexFile(FILE *f)
+{
+ BYTE soFar[16];
+ int soFarCount = 0;
+ DWORD soFarStart = 0;
+
+ // always start from address 0
+ fprintf(f, ":020000040000FA\n");
+
+ DWORD i;
+ for(i = 0; i < PicProgWriteP; i++) {
+ DWORD w = Assemble(PicProg[i].op, PicProg[i].arg1, PicProg[i].arg2);
+
+ if(soFarCount == 0) soFarStart = i;
+ soFar[soFarCount++] = (BYTE)(w & 0xff);
+ soFar[soFarCount++] = (BYTE)(w >> 8);
+
+ if(soFarCount >= 0x10 || i == (PicProgWriteP-1)) {
+ StartIhex(f);
+ WriteIhex(f, soFarCount);
+ WriteIhex(f, (BYTE)((soFarStart*2) >> 8));
+ WriteIhex(f, (BYTE)((soFarStart*2) & 0xff));
+ WriteIhex(f, 0x00);
+ int j;
+ for(j = 0; j < soFarCount; j++) {
+ WriteIhex(f, soFar[j]);
+ }
+ FinishIhex(f);
+ soFarCount = 0;
+ }
+ }
+
+ StartIhex(f);
+ // Configuration words start at address 0x2007 in program memory; and the
+ // hex file addresses are by bytes, not words, so we start at 0x400e.
+ // There may be either 16 or 32 bits of conf word, depending on the part.
+ if(McuIs("Microchip PIC16F887 40-PDIP") ||
+ McuIs("Microchip PIC16F886 28-PDIP or 28-SOIC"))
+ {
+ WriteIhex(f, 0x04);
+ WriteIhex(f, 0x40);
+ WriteIhex(f, 0x0E);
+ WriteIhex(f, 0x00);
+ WriteIhex(f, (Prog.mcu->configurationWord >> 0) & 0xff);
+ WriteIhex(f, (Prog.mcu->configurationWord >> 8) & 0xff);
+ WriteIhex(f, (Prog.mcu->configurationWord >> 16) & 0xff);
+ WriteIhex(f, (Prog.mcu->configurationWord >> 24) & 0xff);
+ } else {
+ if(Prog.mcu->configurationWord & 0xffff0000) oops();
+ WriteIhex(f, 0x02);
+ WriteIhex(f, 0x40);
+ WriteIhex(f, 0x0E);
+ WriteIhex(f, 0x00);
+ WriteIhex(f, (Prog.mcu->configurationWord >> 0) & 0xff);
+ WriteIhex(f, (Prog.mcu->configurationWord >> 8) & 0xff);
+ }
+ FinishIhex(f);
+
+ // end of file record
+ fprintf(f, ":00000001FF\n");
+}
+
+//-----------------------------------------------------------------------------
+// Generate code to write an 8-bit value to a particular register. Takes care
+// of the bank switching if necessary; assumes that code is called in bank
+// 0.
+//-----------------------------------------------------------------------------
+static void WriteRegister(DWORD reg, BYTE val)
+{
+ if(reg & 0x080) Instruction(OP_BSF, REG_STATUS, STATUS_RP0);
+ if(reg & 0x100) Instruction(OP_BSF, REG_STATUS, STATUS_RP1);
+
+ Instruction(OP_MOVLW, val, 0);
+ Instruction(OP_MOVWF, (reg & 0x7f), 0);
+
+ if(reg & 0x080) Instruction(OP_BCF, REG_STATUS, STATUS_RP0);
+ if(reg & 0x100) Instruction(OP_BCF, REG_STATUS, STATUS_RP1);
+}
+
+//-----------------------------------------------------------------------------
+// Call a subroutine, that might be in an arbitrary page, and then put
+// PCLATH back where we want it.
+//-----------------------------------------------------------------------------
+static void CallWithPclath(DWORD addr)
+{
+ // Set up PCLATH for the jump, and then do it.
+ Instruction(OP_MOVLW, FWD_HI(addr), 0);
+ Instruction(OP_MOVWF, REG_PCLATH, 0);
+ Instruction(OP_CALL, FWD_LO(addr), 0);
+
+ // Restore PCLATH to something appropriate for our page. (We have
+ // already made fairly sure that we will never try to compile across
+ // a page boundary.)
+ Instruction(OP_MOVLW, (PicProgWriteP >> 8), 0);
+ Instruction(OP_MOVWF, REG_PCLATH, 0);
+}
+
+// Note that all of these are single instructions on the PIC; this is not the
+// case for their equivalents on the AVR!
+#define SetBit(reg, b) Instruction(OP_BSF, reg, b)
+#define ClearBit(reg, b) Instruction(OP_BCF, reg, b)
+#define IfBitClear(reg, b) Instruction(OP_BTFSS, reg, b)
+#define IfBitSet(reg, b) Instruction(OP_BTFSC, reg, b)
+static void CopyBit(DWORD addrDest, int bitDest, DWORD addrSrc, int bitSrc)
+{
+ IfBitSet(addrSrc, bitSrc);
+ SetBit(addrDest, bitDest);
+ IfBitClear(addrSrc, bitSrc);
+ ClearBit(addrDest, bitDest);
+}
+
+//-----------------------------------------------------------------------------
+// Handle an IF statement. Flow continues to the first instruction generated
+// by this function if the condition is true, else it jumps to the given
+// address (which is an FwdAddress, so not yet assigned). Called with IntPc
+// on the IF statement, returns with IntPc on the END IF.
+//-----------------------------------------------------------------------------
+static void CompileIfBody(DWORD condFalse)
+{
+ IntPc++;
+ CompileFromIntermediate(FALSE);
+ if(IntCode[IntPc].op == INT_ELSE) {
+ IntPc++;
+ DWORD endBlock = AllocFwdAddr();
+ Instruction(OP_GOTO, endBlock, 0);
+
+ FwdAddrIsNow(condFalse);
+ CompileFromIntermediate(FALSE);
+ FwdAddrIsNow(endBlock);
+ } else {
+ FwdAddrIsNow(condFalse);
+ }
+
+ if(IntCode[IntPc].op != INT_END_IF) oops();
+}
+
+//-----------------------------------------------------------------------------
+// Compile the intermediate code to PIC16 native code.
+//-----------------------------------------------------------------------------
+static void CompileFromIntermediate(BOOL topLevel)
+{
+ DWORD addr, addr2;
+ int bit, bit2;
+ DWORD addrl, addrh;
+ DWORD addrl2, addrh2;
+ DWORD addrl3, addrh3;
+
+ // Keep track of which 2k section we are using. When it looks like we
+ // are about to run out, fill with nops and move on to the next one.
+ DWORD section = 0;
+
+ for(; IntPc < IntCodeLen; IntPc++) {
+ // Try for a margin of about 400 words, which is a little bit
+ // wasteful but considering that the formatted output commands
+ // are huge, probably necessary. Of course if we are in our
+ // last section then it is silly to do that, either we make it
+ // or we're screwed...
+ if(topLevel && (((PicProgWriteP + 400) >> 11) != section) &&
+ ((PicProgWriteP + 400) < Prog.mcu->flashWords))
+ {
+
+ // Jump to the beginning of the next section
+ Instruction(OP_MOVLW, (PicProgWriteP >> 8) + (1<<3), 0);
+ Instruction(OP_MOVWF, REG_PCLATH, 0);
+ Instruction(OP_GOTO, 0, 0);
+ // Then, just burn the last of this section with NOPs.
+ while((PicProgWriteP >> 11) == section) {
+ Instruction(OP_MOVLW, 0xab, 0);
+ }
+ section = (PicProgWriteP >> 11);
+ // And now PCLATH is set up, so everything in our new section
+ // should just work
+ }
+ IntOp *a = &IntCode[IntPc];
+ switch(a->op) {
+ case INT_SET_BIT:
+ MemForSingleBit(a->name1, FALSE, &addr, &bit);
+ SetBit(addr, bit);
+ break;
+
+ case INT_CLEAR_BIT:
+ MemForSingleBit(a->name1, FALSE, &addr, &bit);
+ ClearBit(addr, bit);
+ break;
+
+ case INT_COPY_BIT_TO_BIT:
+ MemForSingleBit(a->name1, FALSE, &addr, &bit);
+ MemForSingleBit(a->name2, FALSE, &addr2, &bit2);
+ CopyBit(addr, bit, addr2, bit2);
+ break;
+
+ case INT_SET_VARIABLE_TO_LITERAL:
+ MemForVariable(a->name1, &addrl, &addrh);
+ WriteRegister(addrl, a->literal & 0xff);
+ WriteRegister(addrh, a->literal >> 8);
+ break;
+
+ case INT_INCREMENT_VARIABLE: {
+ MemForVariable(a->name1, &addrl, &addrh);
+ DWORD noCarry = AllocFwdAddr();
+ Instruction(OP_INCFSZ, addrl, DEST_F);
+ Instruction(OP_GOTO, noCarry, 0);
+ Instruction(OP_INCF, addrh, DEST_F);
+ FwdAddrIsNow(noCarry);
+ break;
+ }
+ case INT_IF_BIT_SET: {
+ DWORD condFalse = AllocFwdAddr();
+ MemForSingleBit(a->name1, TRUE, &addr, &bit);
+ IfBitClear(addr, bit);
+ Instruction(OP_GOTO, condFalse, 0);
+ CompileIfBody(condFalse);
+ break;
+ }
+ case INT_IF_BIT_CLEAR: {
+ DWORD condFalse = AllocFwdAddr();
+ MemForSingleBit(a->name1, TRUE, &addr, &bit);
+ IfBitSet(addr, bit);
+ Instruction(OP_GOTO, condFalse, 0);
+ CompileIfBody(condFalse);
+ break;
+ }
+ case INT_IF_VARIABLE_LES_LITERAL: {
+ DWORD notTrue = AllocFwdAddr();
+ DWORD isTrue = AllocFwdAddr();
+ DWORD lsbDecides = AllocFwdAddr();
+
+ // V = Rd7*(Rr7')*(R7') + (Rd7')*Rr7*R7 ; but only one of the
+ // product terms can be true, and we know which at compile
+ // time
+ BYTE litH = (a->literal >> 8);
+ BYTE litL = (a->literal & 0xff);
+
+ MemForVariable(a->name1, &addrl, &addrh);
+
+ // var - lit
+ Instruction(OP_MOVLW, litH, 0);
+ Instruction(OP_SUBWF, addrh, DEST_W);
+ IfBitSet(REG_STATUS, STATUS_Z);
+ Instruction(OP_GOTO, lsbDecides, 0);
+ Instruction(OP_MOVWF, Scratch0, 0);
+ if(litH & 0x80) {
+ Instruction(OP_COMF, addrh, DEST_W);
+ Instruction(OP_ANDWF, Scratch0, DEST_W);
+ Instruction(OP_XORWF, Scratch0, DEST_F);
+ } else {
+ Instruction(OP_COMF, Scratch0, DEST_W);
+ Instruction(OP_ANDWF, addrh, DEST_W);
+ Instruction(OP_XORWF, Scratch0, DEST_F);
+ }
+ IfBitSet(Scratch0, 7); // var - lit < 0, var < lit
+ Instruction(OP_GOTO, isTrue, 0);
+ Instruction(OP_GOTO, notTrue, 0);
+
+ FwdAddrIsNow(lsbDecides);
+
+ // var - lit < 0
+ // var < lit
+ Instruction(OP_MOVLW, litL, 0);
+ Instruction(OP_SUBWF, addrl, DEST_W);
+ IfBitClear(REG_STATUS, STATUS_C);
+ Instruction(OP_GOTO, isTrue, 0);
+ Instruction(OP_GOTO, notTrue, 0);
+
+ FwdAddrIsNow(isTrue);
+ CompileIfBody(notTrue);
+ break;
+ }
+ case INT_IF_VARIABLE_EQUALS_VARIABLE: {
+ DWORD notEqual = AllocFwdAddr();
+
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForVariable(a->name2, &addrl2, &addrh2);
+ Instruction(OP_MOVF, addrl, DEST_W);
+ Instruction(OP_SUBWF, addrl2, DEST_W);
+ IfBitClear(REG_STATUS, STATUS_Z);
+ Instruction(OP_GOTO, notEqual, 0);
+ Instruction(OP_MOVF, addrh, DEST_W);
+ Instruction(OP_SUBWF, addrh2, DEST_W);
+ IfBitClear(REG_STATUS, STATUS_Z);
+ Instruction(OP_GOTO, notEqual, 0);
+ CompileIfBody(notEqual);
+ break;
+ }
+ case INT_IF_VARIABLE_GRT_VARIABLE: {
+ DWORD notTrue = AllocFwdAddr();
+ DWORD isTrue = AllocFwdAddr();
+ DWORD lsbDecides = AllocFwdAddr();
+
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForVariable(a->name2, &addrl2, &addrh2);
+
+ // first, a signed comparison of the high octets, which is
+ // a huge pain on the PIC16
+ DWORD iu = addrh2, ju = addrh;
+ DWORD signa = Scratch0;
+ DWORD signb = Scratch1;
+
+ Instruction(OP_COMF, ju, DEST_W);
+ Instruction(OP_MOVWF, signb, 0);
+
+ Instruction(OP_ANDWF, iu, DEST_W);
+ Instruction(OP_MOVWF, signa, 0);
+
+ Instruction(OP_MOVF, iu, DEST_W);
+ Instruction(OP_IORWF, signb, DEST_F);
+ Instruction(OP_COMF, signb, DEST_F);
+
+ Instruction(OP_MOVF, ju, DEST_W);
+ Instruction(OP_SUBWF, iu, DEST_W);
+ IfBitSet(REG_STATUS, STATUS_Z);
+ Instruction(OP_GOTO, lsbDecides, 0);
+
+ Instruction(OP_ANDWF, signb, DEST_F);
+ Instruction(OP_MOVWF, Scratch2, 0);
+ Instruction(OP_COMF, Scratch2, DEST_W);
+ Instruction(OP_ANDWF, signa, DEST_W);
+ Instruction(OP_IORWF, signb, DEST_W);
+ Instruction(OP_XORWF, Scratch2, DEST_F);
+ IfBitSet(Scratch2, 7);
+ Instruction(OP_GOTO, isTrue, 0);
+
+ Instruction(OP_GOTO, notTrue, 0);
+
+ FwdAddrIsNow(lsbDecides);
+ Instruction(OP_MOVF, addrl, DEST_W);
+ Instruction(OP_SUBWF, addrl2, DEST_W);
+ IfBitClear(REG_STATUS, STATUS_C);
+ Instruction(OP_GOTO, isTrue, 0);
+
+ Instruction(OP_GOTO, notTrue, 0);
+
+ FwdAddrIsNow(isTrue);
+ CompileIfBody(notTrue);
+ break;
+ }
+ case INT_SET_VARIABLE_TO_VARIABLE:
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForVariable(a->name2, &addrl2, &addrh2);
+
+ Instruction(OP_MOVF, addrl2, DEST_W);
+ Instruction(OP_MOVWF, addrl, 0);
+
+ Instruction(OP_MOVF, addrh2, DEST_W);
+ Instruction(OP_MOVWF, addrh, 0);
+ break;
+
+ // The add and subtract routines must be written to return correct
+ // results if the destination and one of the operands happen to
+ // be the same registers (e.g. for B = A - B).
+
+ case INT_SET_VARIABLE_ADD:
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForVariable(a->name2, &addrl2, &addrh2);
+ MemForVariable(a->name3, &addrl3, &addrh3);
+
+ Instruction(OP_MOVF, addrl2, DEST_W);
+ Instruction(OP_ADDWF, addrl3, DEST_W);
+ Instruction(OP_MOVWF, addrl, 0);
+ ClearBit(Scratch0, 0);
+ IfBitSet(REG_STATUS, STATUS_C);
+ SetBit(Scratch0, 0);
+
+ Instruction(OP_MOVF, addrh2, DEST_W);
+ Instruction(OP_ADDWF, addrh3, DEST_W);
+ Instruction(OP_MOVWF, addrh, 0);
+ IfBitSet(Scratch0, 0);
+ Instruction(OP_INCF, addrh, DEST_F);
+ break;
+
+ case INT_SET_VARIABLE_SUBTRACT:
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForVariable(a->name2, &addrl2, &addrh2);
+ MemForVariable(a->name3, &addrl3, &addrh3);
+
+ Instruction(OP_MOVF, addrl3, DEST_W);
+ Instruction(OP_SUBWF, addrl2, DEST_W);
+ Instruction(OP_MOVWF, addrl, 0);
+ ClearBit(Scratch0, 0);
+ IfBitSet(REG_STATUS, STATUS_C);
+ SetBit(Scratch0, 0);
+
+ Instruction(OP_MOVF, addrh3, DEST_W);
+ Instruction(OP_SUBWF, addrh2, DEST_W);
+ Instruction(OP_MOVWF, addrh, 0);
+ IfBitClear(Scratch0, 0); // bit is carry / (not borrow)
+ Instruction(OP_DECF, addrh, DEST_F);
+ break;
+
+ case INT_SET_VARIABLE_MULTIPLY:
+ MultiplyNeeded = TRUE;
+
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForVariable(a->name2, &addrl2, &addrh2);
+ MemForVariable(a->name3, &addrl3, &addrh3);
+
+ Instruction(OP_MOVF, addrl2, DEST_W);
+ Instruction(OP_MOVWF, Scratch0, 0);
+ Instruction(OP_MOVF, addrh2, DEST_W);
+ Instruction(OP_MOVWF, Scratch1, 0);
+
+ Instruction(OP_MOVF, addrl3, DEST_W);
+ Instruction(OP_MOVWF, Scratch2, 0);
+ Instruction(OP_MOVF, addrh3, DEST_W);
+ Instruction(OP_MOVWF, Scratch3, 0);
+
+ CallWithPclath(MultiplyRoutineAddress);
+
+ Instruction(OP_MOVF, Scratch2, DEST_W);
+ Instruction(OP_MOVWF, addrl, 0);
+ Instruction(OP_MOVF, Scratch3, DEST_W);
+ Instruction(OP_MOVWF, addrh, 0);
+ break;
+
+ case INT_SET_VARIABLE_DIVIDE:
+ DivideNeeded = TRUE;
+
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForVariable(a->name2, &addrl2, &addrh2);
+ MemForVariable(a->name3, &addrl3, &addrh3);
+
+ Instruction(OP_MOVF, addrl2, DEST_W);
+ Instruction(OP_MOVWF, Scratch0, 0);
+ Instruction(OP_MOVF, addrh2, DEST_W);
+ Instruction(OP_MOVWF, Scratch1, 0);
+
+ Instruction(OP_MOVF, addrl3, DEST_W);
+ Instruction(OP_MOVWF, Scratch2, 0);
+ Instruction(OP_MOVF, addrh3, DEST_W);
+ Instruction(OP_MOVWF, Scratch3, 0);
+
+ CallWithPclath(DivideRoutineAddress);
+
+ Instruction(OP_MOVF, Scratch0, DEST_W);
+ Instruction(OP_MOVWF, addrl, 0);
+ Instruction(OP_MOVF, Scratch1, DEST_W);
+ Instruction(OP_MOVWF, addrh, 0);
+ break;
+
+ case INT_UART_SEND: {
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForSingleBit(a->name2, TRUE, &addr, &bit);
+
+ DWORD noSend = AllocFwdAddr();
+ IfBitClear(addr, bit);
+ Instruction(OP_GOTO, noSend, 0);
+
+ Instruction(OP_MOVF, addrl, DEST_W);
+ Instruction(OP_MOVWF, REG_TXREG, 0);
+
+ FwdAddrIsNow(noSend);
+ ClearBit(addr, bit);
+
+ DWORD notBusy = AllocFwdAddr();
+ Instruction(OP_BSF, REG_STATUS, STATUS_RP0);
+ Instruction(OP_BTFSC, REG_TXSTA ^ 0x80, 1);
+ Instruction(OP_GOTO, notBusy, 0);
+
+ Instruction(OP_BCF, REG_STATUS, STATUS_RP0);
+ SetBit(addr, bit);
+
+ FwdAddrIsNow(notBusy);
+ Instruction(OP_BCF, REG_STATUS, STATUS_RP0);
+
+ break;
+ }
+ case INT_UART_RECV: {
+ MemForVariable(a->name1, &addrl, &addrh);
+ MemForSingleBit(a->name2, TRUE, &addr, &bit);
+
+ ClearBit(addr, bit);
+
+ // If RCIF is still clear, then there's nothing to do; in that
+ // case jump to the end, and leave the rung-out clear.
+ DWORD done = AllocFwdAddr();
+ IfBitClear(REG_PIR1, 5);
+ Instruction(OP_GOTO, done, 0);
+
+ // RCIF is set, so we have a character. Read it now.
+ Instruction(OP_MOVF, REG_RCREG, DEST_W);
+ Instruction(OP_MOVWF, addrl, 0);
+ Instruction(OP_CLRF, addrh, 0);
+ // and set rung-out true
+ SetBit(addr, bit);
+
+ // And check for errors; need to reset the UART if yes.
+ DWORD yesError = AllocFwdAddr();
+ IfBitSet(REG_RCSTA, 1); // overrun error
+ Instruction(OP_GOTO, yesError, 0);
+ IfBitSet(REG_RCSTA, 2); // framing error
+ Instruction(OP_GOTO, yesError, 0);
+
+ // Neither FERR nor OERR is set, so we're good.
+ Instruction(OP_GOTO, done, 0);
+
+ FwdAddrIsNow(yesError);
+ // An error did occur, so flush the FIFO.
+ Instruction(OP_MOVF, REG_RCREG, DEST_W);
+ Instruction(OP_MOVF, REG_RCREG, DEST_W);
+ // And clear and then set CREN, to clear the error flags.
+ ClearBit(REG_RCSTA, 4);
+ SetBit(REG_RCSTA, 4);
+
+ FwdAddrIsNow(done);
+ break;
+ }
+ case INT_SET_PWM: {
+ int target = atoi(a->name2);
+
+ // So the PWM frequency is given by
+ // target = xtal/(4*prescale*pr2)
+ // xtal/target = 4*prescale*pr2
+ // and pr2 should be made as large as possible to keep
+ // resolution, so prescale should be as small as possible
+
+ int pr2;
+ int prescale;
+ for(prescale = 1;;) {
+ int dv = 4*prescale*target;
+ pr2 = (Prog.mcuClock + (dv/2))/dv;
+ if(pr2 < 3) {
+ Error(_("PWM frequency too fast."));
+ CompileError();
+ }
+ if(pr2 >= 256) {
+ if(prescale == 1) {
+ prescale = 4;
+ } else if(prescale == 4) {
+ prescale = 16;
+ } else {
+ Error(_("PWM frequency too slow."));
+ CompileError();
+ }
+ } else {
+ break;
+ }
+ }
+
+ // First scale the input variable from percent to timer units,
+ // with a multiply and then a divide.
+ MultiplyNeeded = TRUE; DivideNeeded = TRUE;
+ MemForVariable(a->name1, &addrl, &addrh);
+ Instruction(OP_MOVF, addrl, DEST_W);
+ Instruction(OP_MOVWF, Scratch0, 0);
+ Instruction(OP_CLRF, Scratch1, 0);
+
+ Instruction(OP_MOVLW, pr2, 0);
+ Instruction(OP_MOVWF, Scratch2, 0);
+ Instruction(OP_CLRF, Scratch3, 0);
+
+ CallWithPclath(MultiplyRoutineAddress);
+
+ Instruction(OP_MOVF, Scratch3, DEST_W);
+ Instruction(OP_MOVWF, Scratch1, 0);
+ Instruction(OP_MOVF, Scratch2, DEST_W);
+ Instruction(OP_MOVWF, Scratch0, 0);
+ Instruction(OP_MOVLW, 100, 0);
+ Instruction(OP_MOVWF, Scratch2, 0);
+ Instruction(OP_CLRF, Scratch3, 0);
+
+ CallWithPclath(DivideRoutineAddress);
+
+ Instruction(OP_MOVF, Scratch0, DEST_W);
+ Instruction(OP_MOVWF, REG_CCPR2L, 0);
+
+ // Only need to do the setup stuff once
+ MemForSingleBit("$pwm_init", FALSE, &addr, &bit);
+ DWORD skip = AllocFwdAddr();
+ IfBitSet(addr, bit);
+ Instruction(OP_GOTO, skip, 0);
+ SetBit(addr, bit);
+
+ // Set up the CCP2 and TMR2 peripherals.
+ WriteRegister(REG_PR2, (pr2-1));
+ WriteRegister(REG_CCP2CON, 0x0c); // PWM mode, ignore lsbs
+
+ BYTE t2con = (1 << 2); // timer 2 on
+ if(prescale == 1)
+ t2con |= 0;
+ else if(prescale == 4)
+ t2con |= 1;
+ else if(prescale == 16)
+ t2con |= 2;
+ else oops();
+ WriteRegister(REG_T2CON, t2con);
+
+ FwdAddrIsNow(skip);
+ break;
+ }
+
+// A quick helper macro to set the banksel bits correctly; this is necessary
+// because the EEwhatever registers are all over in the memory maps.
+#define EE_REG_BANKSEL(r) \
+ if((r) & 0x80) { \
+ if(!(m & 0x80)) { \
+ m |= 0x80; \
+ Instruction(OP_BSF, REG_STATUS, STATUS_RP0); \
+ } \
+ } else { \
+ if(m & 0x80) { \
+ m &= ~0x80; \
+ Instruction(OP_BCF, REG_STATUS, STATUS_RP0); \
+ } \
+ } \
+ if((r) & 0x100) { \
+ if(!(m & 0x100)) { \
+ m |= 0x100; \
+ Instruction(OP_BSF, REG_STATUS, STATUS_RP1); \
+ } \
+ } else { \
+ if(m & 0x100) { \
+ m &= ~0x100; \
+ Instruction(OP_BCF, REG_STATUS, STATUS_RP1); \
+ } \
+ }
+
+ case INT_EEPROM_BUSY_CHECK: {
+ DWORD isBusy = AllocFwdAddr();
+ DWORD done = AllocFwdAddr();
+ MemForSingleBit(a->name1, FALSE, &addr, &bit);
+
+ WORD m = 0;
+
+ EE_REG_BANKSEL(REG_EECON1);
+ IfBitSet(REG_EECON1 ^ m, 1);
+ Instruction(OP_GOTO, isBusy, 0);
+ EE_REG_BANKSEL(0);
+
+ IfBitClear(EepromHighByteWaitingAddr, EepromHighByteWaitingBit);
+ Instruction(OP_GOTO, done, 0);
+
+ // So there is not a write pending, but we have another
+ // character to transmit queued up.
+
+ EE_REG_BANKSEL(REG_EEADR);
+ Instruction(OP_INCF, REG_EEADR ^ m, DEST_F);
+ EE_REG_BANKSEL(0);
+ Instruction(OP_MOVF, EepromHighByte, DEST_W);
+ EE_REG_BANKSEL(REG_EEDATA);
+ Instruction(OP_MOVWF, REG_EEDATA ^ m, 0);
+ EE_REG_BANKSEL(REG_EECON1);
+ Instruction(OP_BCF, REG_EECON1 ^ m, 7);
+ Instruction(OP_BSF, REG_EECON1 ^ m, 2);
+ Instruction(OP_MOVLW, 0x55, 0);
+ Instruction(OP_MOVWF, REG_EECON2 ^ m, 0);
+ Instruction(OP_MOVLW, 0xaa, 0);
+ Instruction(OP_MOVWF, REG_EECON2 ^ m, 0);
+ Instruction(OP_BSF, REG_EECON1 ^ m, 1);
+
+ EE_REG_BANKSEL(0);
+
+ ClearBit(EepromHighByteWaitingAddr, EepromHighByteWaitingBit);
+
+ FwdAddrIsNow(isBusy);
+ // Have to do these explicitly; m is out of date due to jump.
+ Instruction(OP_BCF, REG_STATUS, STATUS_RP0);
+ Instruction(OP_BCF, REG_STATUS, STATUS_RP1);
+ SetBit(addr, bit);
+
+ FwdAddrIsNow(done);
+ break;
+ }
+ case INT_EEPROM_WRITE: {
+ MemForVariable(a->name1, &addrl, &addrh);
+
+ WORD m = 0;
+
+ SetBit(EepromHighByteWaitingAddr, EepromHighByteWaitingBit);
+ Instruction(OP_MOVF, addrh, DEST_W);
+ Instruction(OP_MOVWF, EepromHighByte, 0);
+
+ EE_REG_BANKSEL(REG_EEADR);
+ Instruction(OP_MOVLW, a->literal, 0);
+ Instruction(OP_MOVWF, REG_EEADR ^ m, 0);
+ EE_REG_BANKSEL(0);
+ Instruction(OP_MOVF, addrl, DEST_W);
+ EE_REG_BANKSEL(REG_EEDATA);
+ Instruction(OP_MOVWF, REG_EEDATA ^ m, 0);
+ EE_REG_BANKSEL(REG_EECON1);
+ Instruction(OP_BCF, REG_EECON1 ^ m, 7);
+ Instruction(OP_BSF, REG_EECON1 ^ m, 2);
+ Instruction(OP_MOVLW, 0x55, 0);
+ Instruction(OP_MOVWF, REG_EECON2 ^ m, 0);
+ Instruction(OP_MOVLW, 0xaa, 0);
+ Instruction(OP_MOVWF, REG_EECON2 ^ m, 0);
+ Instruction(OP_BSF, REG_EECON1 ^ m, 1);
+
+ EE_REG_BANKSEL(0);
+ break;
+ }
+ case INT_EEPROM_READ: {
+ int i;
+ MemForVariable(a->name1, &addrl, &addrh);
+ WORD m = 0;
+ for(i = 0; i < 2; i++) {
+ EE_REG_BANKSEL(REG_EEADR);
+ Instruction(OP_MOVLW, a->literal+i, 0);
+ Instruction(OP_MOVWF, REG_EEADR ^ m, 0);
+ EE_REG_BANKSEL(REG_EECON1);
+ Instruction(OP_BCF, REG_EECON1 ^ m, 7);
+ Instruction(OP_BSF, REG_EECON1 ^ m, 0);
+ EE_REG_BANKSEL(REG_EEDATA);
+ Instruction(OP_MOVF, REG_EEDATA ^ m , DEST_W);
+ EE_REG_BANKSEL(0);
+ if(i == 0) {
+ Instruction(OP_MOVWF, addrl, 0);
+ } else {
+ Instruction(OP_MOVWF, addrh, 0);
+ }
+ }
+ break;
+ }
+ case INT_READ_ADC: {
+ BYTE adcs;
+
+ MemForVariable(a->name1, &addrl, &addrh);
+
+ if(Prog.mcuClock > 5000000) {
+ adcs = 2; // 32*Tosc
+ } else if(Prog.mcuClock > 1250000) {
+ adcs = 1; // 8*Tosc
+ } else {
+ adcs = 0; // 2*Tosc
+ }
+
+ int goPos, chsPos;
+ if(McuIs("Microchip PIC16F887 40-PDIP") ||
+ McuIs("Microchip PIC16F886 28-PDIP or 28-SOIC"))
+ {
+ goPos = 1;
+ chsPos = 2;
+ } else {
+ goPos = 2;
+ chsPos = 3;
+ }
+ WriteRegister(REG_ADCON0, (BYTE)
+ ((adcs << 6) |
+ (MuxForAdcVariable(a->name1) << chsPos) |
+ (0 << goPos) | // don't start yet
+ // bit 1 unimplemented
+ (1 << 0)) // A/D peripheral on
+ );
+
+ WriteRegister(REG_ADCON1,
+ (1 << 7) | // right-justified
+ (0 << 0) // for now, all analog inputs
+ );
+ if(strcmp(Prog.mcu->mcuName,
+ "Microchip PIC16F88 18-PDIP or 18-SOIC")==0)
+ {
+ WriteRegister(REG_ANSEL, 0x7f);
+ }
+ if(McuIs("Microchip PIC16F887 40-PDIP") ||
+ McuIs("Microchip PIC16F886 28-PDIP or 28-SOIC"))
+ {
+ WriteRegister(REG_ANSEL, 0xff);
+ WriteRegister(REG_ANSELH, 0x3f);
+ }
+
+ // need to wait Tacq (about 20 us) for mux, S/H etc. to settle
+ int cyclesToWait = ((Prog.mcuClock / 4) * 20) / 1000000;
+ cyclesToWait /= 3;
+ if(cyclesToWait < 1) cyclesToWait = 1;
+
+ Instruction(OP_MOVLW, cyclesToWait, 0);
+ Instruction(OP_MOVWF, Scratch1, 0);
+ DWORD wait = PicProgWriteP;
+ Instruction(OP_DECFSZ, Scratch1, DEST_F);
+ Instruction(OP_GOTO, wait, 0);
+
+ SetBit(REG_ADCON0, goPos);
+ DWORD spin = PicProgWriteP;
+ IfBitSet(REG_ADCON0, goPos);
+ Instruction(OP_GOTO, spin, 0);
+
+ Instruction(OP_MOVF, REG_ADRESH, DEST_W);
+ Instruction(OP_MOVWF, addrh, 0);
+
+ Instruction(OP_BSF, REG_STATUS, STATUS_RP0);
+ Instruction(OP_MOVF, REG_ADRESL ^ 0x80, DEST_W);
+ Instruction(OP_BCF, REG_STATUS, STATUS_RP0);
+ Instruction(OP_MOVWF, addrl, 0);
+
+ // hook those pins back up to the digital inputs in case
+ // some of them are used that way
+ WriteRegister(REG_ADCON1,
+ (1 << 7) | // right-justify A/D result
+ (6 << 0) // all digital inputs
+ );
+ if(strcmp(Prog.mcu->mcuName,
+ "Microchip PIC16F88 18-PDIP or 18-SOIC")==0)
+ {
+ WriteRegister(REG_ANSEL, 0x00);
+ }
+ if(McuIs("Microchip PIC16F887 40-PDIP") ||
+ McuIs("Microchip PIC16F886 28-PDIP or 28-SOIC"))
+ {
+ WriteRegister(REG_ANSEL, 0x00);
+ WriteRegister(REG_ANSELH, 0x00);
+ }
+ break;
+ }
+ case INT_END_IF:
+ case INT_ELSE:
+ return;
+
+ case INT_SIMULATE_NODE_STATE:
+ case INT_COMMENT:
+ break;
+
+ default:
+ oops();
+ break;
+ }
+ if(((PicProgWriteP >> 11) != section) && topLevel) {
+ // This is particularly prone to happening in the last section,
+ // if the program doesn't fit (since we won't have attempted
+ // to add padding).
+ Error(_("Internal error relating to PIC paging; make program "
+ "smaller or reshuffle it."));
+ CompileError();
+ }
+ }
+}
+
+//-----------------------------------------------------------------------------
+// Configure Timer1 and Ccp1 to generate the periodic `cycle' interrupt
+// that triggers all the ladder logic processing. We will always use 16-bit
+// Timer1, with the prescaler configured appropriately.
+//-----------------------------------------------------------------------------
+static void ConfigureTimer1(int cycleTimeMicroseconds)
+{
+ int divisor = 1;
+ int countsPerCycle;
+
+ while(divisor < 16) {
+ int timerRate = (Prog.mcuClock / (4*divisor)); // hertz
+ double timerPeriod = 1e6 / timerRate; // timer period, us
+ countsPerCycle = (int)(cycleTimeMicroseconds / timerPeriod);
+
+ if(countsPerCycle < 1000) {
+ Error(_("Cycle time too fast; increase cycle time, or use faster "
+ "crystal."));
+ CompileError();
+ } else if(countsPerCycle > 0xffff) {
+ if(divisor >= 8) {
+ Error(
+ _("Cycle time too slow; decrease cycle time, or use slower "
+ "crystal."));
+ CompileError();
+ }
+ } else {
+ break;
+ }
+ divisor *= 2;
+ }
+
+ WriteRegister(REG_CCPR1L, countsPerCycle & 0xff);
+ WriteRegister(REG_CCPR1H, countsPerCycle >> 8);
+
+ WriteRegister(REG_TMR1L, 0);
+ WriteRegister(REG_TMR1H, 0);
+
+ BYTE t1con = 0;
+ // set up prescaler
+ if(divisor == 1) t1con |= 0x00;
+ else if(divisor == 2) t1con |= 0x10;
+ else if(divisor == 4) t1con |= 0x20;
+ else if(divisor == 8) t1con |= 0x30;
+ else oops();
+ // enable clock, internal source
+ t1con |= 0x01;
+ WriteRegister(REG_T1CON, t1con);
+
+ BYTE ccp1con;
+ // compare mode, reset TMR1 on trigger
+ ccp1con = 0x0b;
+ WriteRegister(REG_CCP1CON, ccp1con);
+}
+
+//-----------------------------------------------------------------------------
+// Write a subroutine to do a 16x16 signed multiply. One operand in
+// Scratch1:Scratch0, other in Scratch3:Scratch2, result in Scratch3:Scratch2.
+//-----------------------------------------------------------------------------
+static void WriteMultiplyRoutine(void)
+{
+ DWORD result3 = Scratch5;
+ DWORD result2 = Scratch4;
+ DWORD result1 = Scratch3;
+ DWORD result0 = Scratch2;
+
+ DWORD multiplicand0 = Scratch0;
+ DWORD multiplicand1 = Scratch1;
+
+ DWORD counter = Scratch6;
+
+ DWORD dontAdd = AllocFwdAddr();
+ DWORD top;
+
+ FwdAddrIsNow(MultiplyRoutineAddress);
+
+ Instruction(OP_CLRF, result3, 0);
+ Instruction(OP_CLRF, result2, 0);
+ Instruction(OP_BCF, REG_STATUS, STATUS_C);
+ Instruction(OP_RRF, result1, DEST_F);
+ Instruction(OP_RRF, result0, DEST_F);
+
+ Instruction(OP_MOVLW, 16, 0);
+ Instruction(OP_MOVWF, counter, 0);
+
+ top = PicProgWriteP;
+ Instruction(OP_BTFSS, REG_STATUS, STATUS_C);
+ Instruction(OP_GOTO, dontAdd, 0);
+ Instruction(OP_MOVF, multiplicand0, DEST_W);
+ Instruction(OP_ADDWF, result2, DEST_F);
+ Instruction(OP_BTFSC, REG_STATUS, STATUS_C);
+ Instruction(OP_INCF, result3, DEST_F);
+ Instruction(OP_MOVF, multiplicand1, DEST_W);
+ Instruction(OP_ADDWF, result3, DEST_F);
+ FwdAddrIsNow(dontAdd);
+
+
+ Instruction(OP_BCF, REG_STATUS, STATUS_C);
+ Instruction(OP_RRF, result3, DEST_F);
+ Instruction(OP_RRF, result2, DEST_F);
+ Instruction(OP_RRF, result1, DEST_F);
+ Instruction(OP_RRF, result0, DEST_F);
+
+ Instruction(OP_DECFSZ, counter, DEST_F);
+ Instruction(OP_GOTO, top, 0);
+
+ Instruction(OP_RETURN, 0, 0);
+}
+
+//-----------------------------------------------------------------------------
+// Write a subroutine to do a 16/16 signed divide. Call with dividend in
+// Scratch1:0, divisor in Scratch3:2, and get the result in Scratch1:0.
+//-----------------------------------------------------------------------------
+static void WriteDivideRoutine(void)
+{
+ DWORD dividend0 = Scratch0;
+ DWORD dividend1 = Scratch1;
+
+ DWORD divisor0 = Scratch2;
+ DWORD divisor1 = Scratch3;
+
+ DWORD remainder0 = Scratch4;
+ DWORD remainder1 = Scratch5;
+
+ DWORD counter = Scratch6;
+ DWORD sign = Scratch7;
+
+ DWORD dontNegateDivisor = AllocFwdAddr();
+ DWORD dontNegateDividend = AllocFwdAddr();
+ DWORD done = AllocFwdAddr();
+ DWORD notNegative = AllocFwdAddr();
+ DWORD loop;
+
+ FwdAddrIsNow(DivideRoutineAddress);
+ Instruction(OP_MOVF, dividend1, DEST_W);
+ Instruction(OP_XORWF, divisor1, DEST_W);
+ Instruction(OP_MOVWF, sign, 0);
+
+ Instruction(OP_BTFSS, divisor1, 7);
+ Instruction(OP_GOTO, dontNegateDivisor, 0);
+ Instruction(OP_COMF, divisor0, DEST_F);
+ Instruction(OP_COMF, divisor1, DEST_F);
+ Instruction(OP_INCF, divisor0, DEST_F);
+ Instruction(OP_BTFSC, REG_STATUS, STATUS_Z);
+ Instruction(OP_INCF, divisor1, DEST_F);
+ FwdAddrIsNow(dontNegateDivisor);
+
+ Instruction(OP_BTFSS, dividend1, 7);
+ Instruction(OP_GOTO, dontNegateDividend, 0);
+ Instruction(OP_COMF, dividend0, DEST_F);
+ Instruction(OP_COMF, dividend1, DEST_F);
+ Instruction(OP_INCF, dividend0, DEST_F);
+ Instruction(OP_BTFSC, REG_STATUS, STATUS_Z);
+ Instruction(OP_INCF, dividend1, DEST_F);
+ FwdAddrIsNow(dontNegateDividend);
+
+ Instruction(OP_CLRF, remainder1, 0);
+ Instruction(OP_CLRF, remainder0, 0);
+
+ Instruction(OP_BCF, REG_STATUS, STATUS_C);
+
+ Instruction(OP_MOVLW, 17, 0);
+ Instruction(OP_MOVWF, counter, 0);
+
+ loop = PicProgWriteP;
+ Instruction(OP_RLF, dividend0, DEST_F);
+ Instruction(OP_RLF, dividend1, DEST_F);
+
+ Instruction(OP_DECF, counter, DEST_F);
+ Instruction(OP_BTFSC, REG_STATUS, STATUS_Z);
+ Instruction(OP_GOTO, done, 0);
+
+ Instruction(OP_RLF, remainder0, DEST_F);
+ Instruction(OP_RLF, remainder1, DEST_F);
+
+ Instruction(OP_MOVF, divisor0, DEST_W);
+ Instruction(OP_SUBWF, remainder0, DEST_F);
+ Instruction(OP_BTFSS, REG_STATUS, STATUS_C);
+ Instruction(OP_DECF, remainder1, DEST_F);
+ Instruction(OP_MOVF, divisor1, DEST_W);
+ Instruction(OP_SUBWF, remainder1, DEST_F);
+
+ Instruction(OP_BTFSS, remainder1, 7);
+ Instruction(OP_GOTO, notNegative, 0);
+
+ Instruction(OP_MOVF, divisor0, DEST_W);
+ Instruction(OP_ADDWF, remainder0, DEST_F);
+ Instruction(OP_BTFSC, REG_STATUS, STATUS_C);
+ Instruction(OP_INCF, remainder1, DEST_F);
+ Instruction(OP_MOVF, divisor1, DEST_W);
+ Instruction(OP_ADDWF, remainder1, DEST_F);
+
+ Instruction(OP_BCF, REG_STATUS, STATUS_C);
+ Instruction(OP_GOTO, loop, 0);
+
+ FwdAddrIsNow(notNegative);
+ Instruction(OP_BSF, REG_STATUS, STATUS_C);
+ Instruction(OP_GOTO, loop, 0);
+
+ FwdAddrIsNow(done);
+ Instruction(OP_BTFSS, sign, 7);
+ Instruction(OP_RETURN, 0, 0);
+
+ Instruction(OP_COMF, dividend0, DEST_F);
+ Instruction(OP_COMF, dividend1, DEST_F);
+ Instruction(OP_INCF, dividend0, DEST_F);
+ Instruction(OP_BTFSC, REG_STATUS, STATUS_Z);
+ Instruction(OP_INCF, dividend1, DEST_F);
+ Instruction(OP_RETURN, 0, 0);
+}
+
+//-----------------------------------------------------------------------------
+// Compile the program to PIC16 code for the currently selected processor
+// and write it to the given file. Produce an error message if we cannot
+// write to the file, or if there is something inconsistent about the
+// program.
+//-----------------------------------------------------------------------------
+void CompilePic16(char *outFile)
+{
+ FILE *f = fopen(outFile, "w");
+ if(!f) {
+ Error(_("Couldn't open file '%s'"), outFile);
+ return;
+ }
+
+ if(setjmp(CompileErrorBuf) != 0) {
+ fclose(f);
+ return;
+ }
+
+ WipeMemory();
+
+ AllocStart();
+
+ Scratch0 = AllocOctetRam();
+ Scratch1 = AllocOctetRam();
+ Scratch2 = AllocOctetRam();
+ Scratch3 = AllocOctetRam();
+ Scratch4 = AllocOctetRam();
+ Scratch5 = AllocOctetRam();
+ Scratch6 = AllocOctetRam();
+ Scratch7 = AllocOctetRam();
+
+ // Allocate the register used to hold the high byte of the EEPROM word
+ // that's queued up to program, plus the bit to indicate that it is
+ // valid.
+ EepromHighByte = AllocOctetRam();
+ AllocBitRam(&EepromHighByteWaitingAddr, &EepromHighByteWaitingBit);
+
+ DWORD progStart = AllocFwdAddr();
+ // Our boot vectors; not necessary to do it like this, but it lets
+ // bootloaders rewrite the beginning of the program to do their magic.
+ // PCLATH is init to 0, but apparently some bootloaders want to see us
+ // initialize it again.
+
+ Instruction(OP_BCF, REG_PCLATH, 3);
+ Instruction(OP_BCF, REG_PCLATH, 4);
+ Instruction(OP_GOTO, progStart, 0);
+ Instruction(OP_NOP, 0, 0);
+ Instruction(OP_NOP, 0, 0);
+ Instruction(OP_NOP, 0, 0);
+ Instruction(OP_NOP, 0, 0);
+ Instruction(OP_NOP, 0, 0);
+ FwdAddrIsNow(progStart);
+
+ // Now zero out the RAM
+ Instruction(OP_MOVLW, Prog.mcu->ram[0].start + 8, 0);
+ Instruction(OP_MOVWF, REG_FSR, 0);
+ Instruction(OP_MOVLW, Prog.mcu->ram[0].len - 8, 0);
+ Instruction(OP_MOVWF, Scratch0, 0);
+
+ DWORD zeroMem = PicProgWriteP;
+ Instruction(OP_CLRF, REG_INDF, 0);
+ Instruction(OP_INCF, REG_FSR, DEST_F);
+ Instruction(OP_DECFSZ, Scratch0, DEST_F);
+ Instruction(OP_GOTO, zeroMem, 0);
+
+ DivideRoutineAddress = AllocFwdAddr();
+ DivideNeeded = FALSE;
+ MultiplyRoutineAddress = AllocFwdAddr();
+ MultiplyNeeded = FALSE;
+
+ ConfigureTimer1(Prog.cycleTime);
+
+ // Set up the TRISx registers (direction). 1 means tri-stated (input).
+ BYTE isInput[MAX_IO_PORTS], isOutput[MAX_IO_PORTS];
+ BuildDirectionRegisters(isInput, isOutput);
+
+ if(McuIs("Microchip PIC16F877 40-PDIP") ||
+ McuIs("Microchip PIC16F819 18-PDIP or 18-SOIC") ||
+ McuIs("Microchip PIC16F88 18-PDIP or 18-SOIC") ||
+ McuIs("Microchip PIC16F876 28-PDIP or 28-SOIC") ||
+ McuIs("Microchip PIC16F887 40-PDIP") ||
+ McuIs("Microchip PIC16F886 28-PDIP or 28-SOIC"))
+ {
+ REG_EECON1 = 0x18c;
+ REG_EECON2 = 0x18d;
+ REG_EEDATA = 0x10c;
+ REG_EEADR = 0x10d;
+ } else if(McuIs("Microchip PIC16F628 18-PDIP or 18-SOIC")) {
+ REG_EECON1 = 0x9c;
+ REG_EECON2 = 0x9d;
+ REG_EEDATA = 0x9a;
+ REG_EEADR = 0x9b;
+ } else {
+ oops();
+ }
+
+ if(McuIs("Microchip PIC16F887 40-PDIP") ||
+ McuIs("Microchip PIC16F886 28-PDIP or 28-SOIC"))
+ {
+ REG_ANSEL = 0x188;
+ REG_ANSELH = 0x189;
+ } else {
+ REG_ANSEL = 0x9b;
+ }
+
+ if(strcmp(Prog.mcu->mcuName, "Microchip PIC16F877 40-PDIP")==0) {
+ // This is a nasty special case; one of the extra bits in TRISE
+ // enables the PSP, and must be kept clear (set here as will be
+ // inverted).
+ isOutput[4] |= 0xf8;
+ }
+
+ if(strcmp(Prog.mcu->mcuName, "Microchip PIC16F877 40-PDIP")==0 ||
+ strcmp(Prog.mcu->mcuName, "Microchip PIC16F819 18-PDIP or 18-SOIC")==0 ||
+ strcmp(Prog.mcu->mcuName, "Microchip PIC16F876 28-PDIP or 28-SOIC")==0)
+ {
+ // The GPIOs that can also be A/D inputs default to being A/D
+ // inputs, so turn that around
+ WriteRegister(REG_ADCON1,
+ (1 << 7) | // right-justify A/D result
+ (6 << 0) // all digital inputs
+ );
+ }
+
+ if(strcmp(Prog.mcu->mcuName, "Microchip PIC16F88 18-PDIP or 18-SOIC")==0) {
+ WriteRegister(REG_ANSEL, 0x00); // all digital inputs
+ }
+
+ if(strcmp(Prog.mcu->mcuName, "Microchip PIC16F628 18-PDIP or 18-SOIC")==0) {
+ // This is also a nasty special case; the comparators on the
+ // PIC16F628 are enabled by default and need to be disabled, or
+ // else the PORTA GPIOs don't work.
+ WriteRegister(REG_CMCON, 0x07);
+ }
+
+ if(McuIs("Microchip PIC16F887 40-PDIP") ||
+ McuIs("Microchip PIC16F886 28-PDIP or 28-SOIC"))
+ {
+ WriteRegister(REG_ANSEL, 0x00); // all digital inputs
+ WriteRegister(REG_ANSELH, 0x00); // all digital inputs
+ }
+
+ if(PwmFunctionUsed()) {
+ // Need to clear TRIS bit corresponding to PWM pin
+ int i;
+ for(i = 0; i < Prog.mcu->pinCount; i++) {
+ if(Prog.mcu->pinInfo[i].pin == Prog.mcu->pwmNeedsPin) {
+ McuIoPinInfo *iop = &(Prog.mcu->pinInfo[i]);
+ isOutput[iop->port - 'A'] |= (1 << iop->bit);
+ break;
+ }
+ }
+ if(i == Prog.mcu->pinCount) oops();
+ }
+
+ int i;
+ for(i = 0; Prog.mcu->dirRegs[i] != 0; i++) {
+ WriteRegister(Prog.mcu->outputRegs[i], 0x00);
+ WriteRegister(Prog.mcu->dirRegs[i], ~isOutput[i]);
+ }
+
+ if(UartFunctionUsed()) {
+ if(Prog.baudRate == 0) {
+ Error(_("Zero baud rate not possible."));
+ fclose(f);
+ return;
+ }
+
+ // So now we should set up the UART. First let us calculate the
+ // baud rate; there is so little point in the fast baud rates that
+ // I won't even bother, so
+ // bps = Fosc/(64*(X+1))
+ // bps*64*(X + 1) = Fosc
+ // X = Fosc/(bps*64)-1
+ // and round, don't truncate
+ int divisor = (Prog.mcuClock + Prog.baudRate*32)/(Prog.baudRate*64) - 1;
+
+ double actual = Prog.mcuClock/(64.0*(divisor+1));
+ double percentErr = 100*(actual - Prog.baudRate)/Prog.baudRate;
+
+ if(fabs(percentErr) > 2) {
+ ComplainAboutBaudRateError(divisor, actual, percentErr);
+ }
+ if(divisor > 255) ComplainAboutBaudRateOverflow();
+
+ WriteRegister(REG_SPBRG, divisor);
+ WriteRegister(REG_TXSTA, 0x20); // only TXEN set
+ WriteRegister(REG_RCSTA, 0x90); // only SPEN, CREN set
+ }
+
+ DWORD top = PicProgWriteP;
+
+ IfBitClear(REG_PIR1, 2);
+ Instruction(OP_GOTO, PicProgWriteP - 1, 0);
+
+ Instruction(OP_BCF, REG_PIR1, 2);
+
+ Instruction(OP_CLRWDT, 0, 0);
+ IntPc = 0;
+ CompileFromIntermediate(TRUE);
+
+ MemCheckForErrorsPostCompile();
+
+ // This is probably a big jump, so give it PCLATH.
+ Instruction(OP_CLRF, REG_PCLATH, 0);
+ Instruction(OP_GOTO, top, 0);
+
+ // Once again, let us make sure not to put stuff on a page boundary
+ if((PicProgWriteP >> 11) != ((PicProgWriteP + 150) >> 11)) {
+ DWORD section = (PicProgWriteP >> 11);
+ // Just burn the last of this section with NOPs.
+ while((PicProgWriteP >> 11) == section) {
+ Instruction(OP_MOVLW, 0xab, 0);
+ }
+ }
+
+ if(MultiplyNeeded) WriteMultiplyRoutine();
+ if(DivideNeeded) WriteDivideRoutine();
+
+ WriteHexFile(f);
+ fclose(f);
+
+ char str[MAX_PATH+500];
+ sprintf(str, _("Compile successful; wrote IHEX for PIC16 to '%s'.\r\n\r\n"
+ "Configuration word (fuses) has been set for crystal oscillator, BOD "
+ "enabled, LVP disabled, PWRT enabled, all code protection off.\r\n\r\n"
+ "Used %d/%d words of program flash (chip %d%% full)."),
+ outFile, PicProgWriteP, Prog.mcu->flashWords,
+ (100*PicProgWriteP)/Prog.mcu->flashWords);
+ CompileSuccessfulMessage(str);
+}
generated by cgit (git 2.34.1) at 2024-12-19 11:59:12 +0000