/*
* Copyright 2007 Free Software Foundation, Inc.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "u2_init.h"
#include "memory_map.h"
#include "spi.h"
#include "hal_io.h"
#include "buffer_pool.h"
#include "pic.h"
#include "bool.h"
#include "ethernet.h"
#include "nonstdio.h"
#include "usrp2_eth_packet.h"
#include "memcpy_wa.h"
#include "dbsm.h"
#include "app_common_v2.h"
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <db.h>
#include <db_base.h>
#define FW_SETS_SEQNO 1 // define to 0 or 1
#if (FW_SETS_SEQNO)
static int fw_seqno; // used when f/w is filling in sequence numbers
#endif
/*
* This program can respond to queries from the host
* and stream rx samples.
*
* Buffer 0 is used for rcvd frames from ethernet
* Buffer 1 is used by the cpu to send frames to the host.
* Buffers 2 and 3 are used to double-buffer the DSP Rx to eth flow
*/
#define CPU_RX_BUF 0 // eth -> cpu
//#define CPU_TX_BUF 1 // cpu -> eth
#define DSP_RX_BUF_0 2 // dsp rx -> eth (double buffer)
#define DSP_RX_BUF_1 3 // dsp rx -> eth
// variables for streaming mode
static bool streaming_p = false;
static int streaming_frame_count = 0;
#define FRAMES_PER_CMD 1000
/*
* ================================================================
* configure DSP RX double buffering state machine
* ================================================================
*/
// 4 lines of ethernet hdr + 1 line transport hdr + 1 line (word0)
// DSP Rx writes timestamp followed by nlines_per_frame of samples
#define DSP_RX_FIRST_LINE ((sizeof(u2_eth_hdr_t) + sizeof(u2_transport_hdr_t))/4 + 1)
// receive from DSP
buf_cmd_args_t dsp_rx_recv_args = {
PORT_DSP,
DSP_RX_FIRST_LINE,
BP_LAST_LINE
};
// send to ETH
buf_cmd_args_t dsp_rx_send_args = {
PORT_ETH,
0, // starts with ethernet header in line 0
0, // filled in from list_line register
};
dbsm_t dsp_rx_sm; // the state machine
// ----------------------------------------------------------------
// The mac address of the host we're sending to.
u2_mac_addr_t host_mac_addr;
void link_changed_callback(int speed);
void
start_rx_streaming_cmd(const u2_mac_addr_t *host, op_start_rx_streaming_t *p)
{
host_mac_addr = *host; // remember who we're sending to
/*
* Construct ethernet header and word0 and preload into two buffers
*/
u2_eth_packet_t pkt;
memset(&pkt, 0, sizeof(pkt));
pkt.ehdr.dst = *host;
pkt.ehdr.ethertype = U2_ETHERTYPE;
u2p_set_word0(&pkt.fixed, 0, 0);
// DSP RX will fill in timestamp
memcpy_wa(buffer_ram(DSP_RX_BUF_0), &pkt, sizeof(pkt));
memcpy_wa(buffer_ram(DSP_RX_BUF_1), &pkt, sizeof(pkt));
if (FW_SETS_SEQNO)
fw_seqno = 0;
// setup RX DSP regs
dsp_rx_regs->clear_state = 1; // reset
if (1){ // we're streaming
streaming_p = true;
streaming_frame_count = FRAMES_PER_CMD;
dsp_rx_regs->rx_command =
MK_RX_CMD(FRAMES_PER_CMD * p->items_per_frame, p->items_per_frame,
1, 1); // set "chain" bit
// kick off the state machine
dbsm_start(&dsp_rx_sm);
dsp_rx_regs->rx_time = 0; // enqueue first of two commands
// make sure this one and the rest have the "now" and "chain" bits set.
dsp_rx_regs->rx_command =
MK_RX_CMD(FRAMES_PER_CMD * p->items_per_frame, p->items_per_frame,
1, 1);
dsp_rx_regs->rx_time = 0; // enqueue second command
}
#if 0
else {
streaming_p = false;
dsp_rx_regs->rx_command =
MK_RX_CMD(p->total_samples, p->items_per_frame, p->rx_now, 0);
// kick off the state machine
dbsm_start(&dsp_rx_sm);
dsp_rx_regs->rx_time = p->rx_time;
}
#endif
}
void
stop_rx_cmd(void)
{
streaming_p = false;
dsp_rx_regs->clear_state = 1; // flush cmd queue
bp_clear_buf(DSP_RX_BUF_0);
bp_clear_buf(DSP_RX_BUF_1);
}
inline static void
buffer_irq_handler(unsigned irq)
{
uint32_t status = buffer_pool_status->status;
if (status & BPS_DONE(CPU_RX_BUF)){ // we've rcvd a frame from ethernet
bp_clear_buf(CPU_RX_BUF);
eth_pkt_inspector(0, CPU_RX_BUF);
bp_receive_to_buf(CPU_RX_BUF, PORT_ETH, 1, 0, BP_LAST_LINE);
}
if (status & BPS_ERROR(CPU_RX_BUF)){ // error from ethernet
bp_clear_buf(CPU_RX_BUF);
bp_receive_to_buf(CPU_RX_BUF, PORT_ETH, 1, 0, BP_LAST_LINE);
}
dbsm_process_status(&dsp_rx_sm, status);
if (status & BPS_DONE(CPU_TX_BUF)){
bp_clear_buf(CPU_TX_BUF);
}
}
#if (FW_SETS_SEQNO)
/*
* Debugging ONLY. This will be handled by the tx_protocol_engine.
*
* This is called when the DSP Rx chain has filled in a packet.
* We set and increment the seqno, then return false, indicating
* that we didn't handle the packet. A bit of a kludge
* but it should work.
*/
bool
fw_sets_seqno_inspector(dbsm_t *sm, int buf_this) // returns false
{
uint32_t *p = buffer_ram(buf_this);
uint32_t seqno = fw_seqno++;
// KLUDGE all kinds of nasty magic numbers and embedded knowledge
uint32_t t = p[4];
t = (t & 0xffff00ff) | ((seqno & 0xff) << 8);
p[4] = t;
// queue up another rx command when required
if (streaming_p && --streaming_frame_count == 0){
streaming_frame_count = FRAMES_PER_CMD;
dsp_rx_regs->rx_time = 0;
}
return false; // we didn't handle the packet
}
#endif
int
main(void)
{
u2_init();
putstr("\nrx_only_v2\n");
ethernet_register_link_changed_callback(link_changed_callback);
ethernet_init();
// initialize double buffering state machine for DSP RX -> Ethernet
if (FW_SETS_SEQNO){
dbsm_init(&dsp_rx_sm, DSP_RX_BUF_0,
&dsp_rx_recv_args, &dsp_rx_send_args,
fw_sets_seqno_inspector);
}
else {
dbsm_init(&dsp_rx_sm, DSP_RX_BUF_0,
&dsp_rx_recv_args, &dsp_rx_send_args,
dbsm_nop_inspector);
}
// setup receive from ETH
bp_receive_to_buf(CPU_RX_BUF, PORT_ETH, 1, 0, BP_LAST_LINE);
while(1){
buffer_irq_handler(0);
int pending = pic_regs->pending; // poll for under or overrun
if (pending & PIC_OVERRUN_INT){
dbsm_handle_rx_overrun(&dsp_rx_sm);
pic_regs->pending = PIC_OVERRUN_INT; // clear pending interrupt
putchar('O');
}
}
}