diff options
Diffstat (limited to 'usrp/firmware/lib/i2c.c')
-rw-r--r-- | usrp/firmware/lib/i2c.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/usrp/firmware/lib/i2c.c b/usrp/firmware/lib/i2c.c deleted file mode 100644 index 0f238b5cf..000000000 --- a/usrp/firmware/lib/i2c.c +++ /dev/null @@ -1,123 +0,0 @@ -/* -*- c++ -*- */ -/* - * Copyright 2003 Free Software Foundation, Inc. - * - * This file is part of GNU Radio - * - * GNU Radio 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, or (at your option) - * any later version. - * - * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to - * the Free Software Foundation, Inc., 51 Franklin Street, - * Boston, MA 02110-1301, USA. - */ - -#include "i2c.h" -#include "fx2regs.h" -#include <string.h> - - -// issue a stop bus cycle and wait for completion - - -// returns non-zero if successful, else 0 -unsigned char -i2c_read (unsigned char addr, xdata unsigned char *buf, unsigned char len) -{ - volatile unsigned char junk; - - if (len == 0) // reading zero bytes always works - return 1; - - while (I2CS & bmSTOP) // wait for stop to clear - ; - - I2CS = bmSTART; - I2DAT = (addr << 1) | 1; // write address and direction (1's the read bit) - - while ((I2CS & bmDONE) == 0) - ; - - if ((I2CS & bmBERR) || (I2CS & bmACK) == 0) // no device answered... - goto fail; - - if (len == 1) - I2CS |= bmLASTRD; - - junk = I2DAT; // trigger the first read cycle - - while (--len != 0){ - while ((I2CS & bmDONE) == 0) - ; - - if (I2CS & bmBERR) - goto fail; - - if (len == 1) - I2CS |= bmLASTRD; - - *buf++ = I2DAT; // get data, trigger another read - } - - // wait for final byte - - while ((I2CS & bmDONE) == 0) - ; - - if (I2CS & bmBERR) - goto fail; - - I2CS |= bmSTOP; - *buf = I2DAT; - - return 1; - - fail: - I2CS |= bmSTOP; - return 0; -} - - - -// returns non-zero if successful, else 0 -unsigned char -i2c_write (unsigned char addr, xdata const unsigned char *buf, unsigned char len) -{ - while (I2CS & bmSTOP) // wait for stop to clear - ; - - I2CS = bmSTART; - I2DAT = (addr << 1) | 0; // write address and direction (0's the write bit) - - while ((I2CS & bmDONE) == 0) - ; - - if ((I2CS & bmBERR) || (I2CS & bmACK) == 0) // no device answered... - goto fail; - - while (len > 0){ - I2DAT = *buf++; - len--; - - while ((I2CS & bmDONE) == 0) - ; - - if ((I2CS & bmBERR) || (I2CS & bmACK) == 0) // no device answered... - goto fail; - } - - I2CS |= bmSTOP; - return 1; - - fail: - I2CS |= bmSTOP; - return 0; -} |