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ch341eeprom.c
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ch341eeprom.c
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//
// ch341eeprom programmer version 0.1 (Beta)
//
// Programming tool for the 24Cxx serial EEPROMs using the Winchiphead CH341A IC
//
// (c) December 2011 asbokid <ballymunboy@gmail.com>
//
// 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/>.
#include <libusb-1.0/libusb.h>
#include <asm/errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <inttypes.h>
#include <getopt.h>
#include "ch341eeprom.h"
FILE *debugout, *verbout;
uint8_t *readbuf = NULL;
int main(int argc, char **argv) {
int i, ret = 0, eepromsize = 0, bytesread = 0;
uint8_t debug = FALSE, verbose = FALSE;
struct libusb_device_handle *devHandle = NULL;
char *filename = NULL, eepromname[12], operation = 0;
FILE *fp;
static char version_msg[] =
"ch341eeprom - an i2c EEPROM programming tool for the WCH CH341a IC\n" \
"Version " CH341TOOLVERSION " copyright (c) 2011 asbokid <ballymunboy@gmail.com>\n\n" \
"This program comes with asbolutely no warranty; This is free software,\n" \
"and you are welcome to redistribute it under certain conditions:\n" \
"GNU GPL v3 License: http://www.gnu.org/licenses/gpl.html\n";
static char usage_msg[] =
"Usage:\n" \
" -h, --help display this text\n" \
" -v, --verbose verbose output\n" \
" -d, --debug debug output\n" \
" -s, --size size of EEPROM {24c32|24c64}\n" \
" -e, --erase erase EEPROM (fill with 0xff)\n" \
" -w, --write <filename> write EEPROM with image from filename\n" \
" -r, --read <filename> read EEPROM and save image to filename\n\n" \
"Example: ch341eeprom -v -s 24c64 -w bootrom.bin\n";
static struct option longopts[] = {
{"help", no_argument, 0, 'h'},
{"verbose", no_argument, 0, 'v'},
{"debug", no_argument, 0, 'd'},
{"erase", no_argument, 0, 'e'},
{"size", required_argument, 0, 's'},
{"read", required_argument, 0, 'r'},
{"write", required_argument, 0, 'w'},
{0, 0, 0, 0}
};
while (TRUE) {
int32_t optidx = 0;
int8_t c = getopt_long(argc,argv,"hvdes:w:r:", longopts, &optidx);
if (c == -1)
break;
switch (c) {
case 'h': fprintf(stdout, "%s\n%s", version_msg, usage_msg);
return 0;
case 'v': verbose = TRUE;
break;
case 'd': debug = TRUE;
break;
case 's': if((eepromsize = parseEEPsize(optarg)) > 0)
strncpy(eepromname, optarg, 10);
break;
case 'e': if(!operation)
operation = 'e';
else {
fprintf(stderr, "Conflicting command line options\n");
goto shutdown;
}
break;
case 'r': if(!operation) {
operation = 'r';
filename = (char *) malloc(strlen(optarg)+1);
strcpy(filename, optarg);
} else {
fprintf(stderr, "Conflicting command line options\n");
goto shutdown;
}
break;
case 'w': if(!operation) {
operation = 'w';
filename = (char *) malloc(strlen(optarg)+1);
strcpy(filename, optarg);
} else {
fprintf(stderr, "Conflicting command line options\n");
goto shutdown;
}
break;
default :
case '?': fprintf(stdout, "%s", version_msg);
fprintf(stderr, "%s", usage_msg);
goto shutdown;
}
}
debugout = (debug == TRUE) ? stdout : fopen("/dev/null","w");
verbout = (verbose == TRUE) ? stdout : fopen("/dev/null","w");
fprintf(debugout, "Debug Enabled\n");
if(!operation) {
fprintf(stderr, "%s\n%s", version_msg, usage_msg);
goto shutdown;
}
if(eepromsize <= 0) {
fprintf(stderr, "Invalid EEPROM size\n");
goto shutdown;
}
readbuf = (uint8_t *) malloc(MAX_EEPROM_SIZE); // space to store loaded EEPROM
if(!readbuf) {
fprintf(stderr, "Couldnt malloc space needed for EEPROM image\n");
goto shutdown;
}
if(!(devHandle = ch341configure(USB_LOCK_VENDOR, USB_LOCK_PRODUCT))) {
fprintf(stderr, "Couldnt configure USB device\n", USB_LOCK_VENDOR, USB_LOCK_PRODUCT);
goto shutdown;
}
fprintf(verbout, "Configured USB device\n", USB_LOCK_VENDOR, USB_LOCK_PRODUCT);
if(ch341setstream(devHandle, CH341_I2C_STANDARD_SPEED) < 0) {
fprintf(stderr, "Couldnt set i2c bus speed\n");
goto shutdown;
}
fprintf(verbout, "Set i2c bus speed to [100kHz]\n");
switch(operation) {
case 'r': // read
memset(readbuf, 0xff, MAX_EEPROM_SIZE);
if(ch341readEEPROM(devHandle, readbuf, eepromsize) < 0) {
fprintf(stderr, "Couldnt read [%d] bytes from [%s] EEPROM\n", eepromsize, eepromname);
goto shutdown;
}
fprintf(stdout, "Read [%d] bytes from [%s] EEPROM\n", eepromsize, eepromname);
for(i=0;i<eepromsize;i++) {
if(!(i%16))
fprintf(debugout, "\n%04x: ", i);
fprintf(debugout, "%02x ", readbuf[i]);
}
fprintf(debugout, "\n");
if(!(fp=fopen(filename, "wb"))) {
fprintf(stderr, "Couldnt open file [%s] for writing\n", filename);
goto shutdown;
}
fwrite(readbuf, 1, eepromsize, fp);
if(ferror(fp)) {
fprintf(stderr, "Error writing file [%s]\n", filename);
if(fp)
fclose(fp);
goto shutdown;
}
fclose(fp);
fprintf(stdout, "Wrote [%d] bytes to file [%s]\n", eepromsize, filename);
break;
case 'w': // write
if(!(fp=fopen(filename, "rb"))) {
fprintf(stderr, "Couldnt open file [%s] for reading\n", filename);
goto shutdown;
}
memset(readbuf, 0xff, MAX_EEPROM_SIZE);
bytesread = fread(readbuf, 1, MAX_EEPROM_SIZE, fp);
if(ferror(fp)) {
fprintf(stderr, "Error reading file [%s]\n", filename);
if(fp)
fclose(fp);
goto shutdown;
}
fclose(fp);
fprintf(stdout, "Read [%d] bytes from file [%s]\n", bytesread, filename);
if(bytesread < eepromsize)
fprintf(stdout, "Padded to [%d] bytes for [%s] EEPROM\n", eepromsize, eepromname);
if(bytesread > eepromsize)
fprintf(stdout, "Truncated to [%d] bytes for [%s] EEPROM\n", eepromsize, eepromname);
if(ch341writeEEPROM(devHandle, readbuf, eepromsize) < 0) {
fprintf(stderr,"Failed to write [%d] bytes from [%s] to [%s] EEPROM\n", eepromsize, filename, eepromname);
goto shutdown;
}
fprintf(stdout, "Wrote [%d] bytes to [%s] EEPROM\n", eepromsize, eepromname);
break;
case 'e': // erase
memset(readbuf, 0xff, MAX_EEPROM_SIZE);
if(ch341writeEEPROM(devHandle, readbuf, eepromsize) < 0) {
fprintf(stderr,"Failed to erase [%d] bytes of [%s] EEPROM\n", eepromsize, eepromname);
goto shutdown;
}
fprintf(stdout, "Erased [%d] bytes of [%s] EEPROM\n", eepromsize, eepromname);
break;
default:
fprintf(stderr, "Unknown option\n");
goto shutdown;
}
shutdown:
if(readbuf)
free(readbuf);
if(filename)
free(filename);
if(devHandle) {
libusb_release_interface(devHandle, DEFAULT_INTERFACE);
fprintf(debugout, "Released device interface [%d]\n", DEFAULT_INTERFACE);
libusb_close(devHandle);
fprintf(verbout, "Closed USB device\n");
libusb_exit(NULL);
}
return 0;
}