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Fix for eeproms bigger than 4k #7

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186 changes: 95 additions & 91 deletions fx2eeprom.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@
cat eeprom.raw | ./fxeeprom w 0x123 0x234 45 > eeprom.raw

Copyright Ricardo Ribalda - 2012 - ricardo.ribalda@gmail.com
Copyright Robert Sinclair - 2025 - 0wwafa@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
Expand All @@ -40,105 +41,108 @@
#define TRANS_TYPE_READ 0xc0
#define TRANS_TYPE_WRITE 0x40
#define EEPROM 0xa2
#define TIMEOUT 1000
#define TIMEOUT 4000
#define LOCATION (1<<4)
#define CHUNK_SIZE 4096

enum {READ,WRITE};

void use(char *prog){

fprintf(stdout,"%s w/r VID PID size\n",prog);
fprintf(stdout,"%s w/r VID PID size\n",prog);

return;
return;
}

int main(int argc, char *argv[]){
struct libusb_device_handle *dev;
int ret;
unsigned char *buffer;
int pid, vid,length;
int address =0;
int mode;

if (argc!=5){
use(argv[0]);
return -1;
}

if ((argv[1][0]=='W')||(argv[1][0]=='w'))
mode=WRITE;
else mode=READ;

vid=strtoul(argv[2],NULL,0);
pid=strtoul(argv[3],NULL,0);
length=strtoul(argv[4],NULL,0);

buffer=malloc(length);
if (!buffer){
fprintf(stderr,"Unable to alloc memory\n");
perror("malloc");
return -1;
}


ret=libusb_init(NULL);
if (ret<0){
fprintf(stderr,"Unable to init libusb\n");
perror("libusb_init");
return -1;
}

dev=libusb_open_device_with_vid_pid(NULL,vid,pid);
if (!dev){
fprintf(stderr,"Unable to find device\n");
perror("libusb_open");
return -1;
}

if (libusb_kernel_driver_active(dev, 0) && libusb_detach_kernel_driver(dev, 0)){
fprintf(stderr,"Unable to detach kernel driver\n");
perror("libusb_detach_kernel_driver");
return -1;
}

ret=libusb_claim_interface(dev,0);
if (ret<0){
fprintf(stderr,"Unable to clain interface\n");
perror("libusb_claim_interface");
return -1;
}

if (mode==READ){
ret = libusb_control_transfer(dev,TRANS_TYPE_READ,EEPROM,address,LOCATION,buffer,length,TIMEOUT);
if (ret<0){
fprintf(stderr,"Unable to control transfer\n");
perror("libusb_control_transfer");
return -1;
}

fprintf(stderr,"Readed %d bytes\n",ret);

length=fwrite(buffer,ret,1,stdout);
}
else {
ret=fread(buffer,1,length,stdin);
if (length!=ret){
fprintf(stderr,"Wrong size from stdin, expected %d readed %d\n",length,ret);
perror("fread");
return -1;
}

ret = libusb_control_transfer(dev,TRANS_TYPE_WRITE,EEPROM,address,LOCATION,buffer,length,TIMEOUT);
if (ret<0){
fprintf(stderr,"Unable to control transfer\n");
perror("libusb_control_transfer");
return -1;
}
fprintf(stderr,"Written %d bytes\n",ret);
}

libusb_close(dev);
libusb_exit(NULL);

return 0;
struct libusb_device_handle *dev;
int ret;
unsigned char *buffer;
int pid, vid,length;
int mode;

if (argc!=5){
use(argv[0]);
return -1;
}

if ((argv[1][0]=='W')||(argv[1][0]=='w'))
mode=WRITE;
else mode=READ;

vid=strtoul(argv[2],NULL,0);
pid=strtoul(argv[3],NULL,0);
length=strtoul(argv[4],NULL,0);

buffer=malloc(CHUNK_SIZE);
if (!buffer){
fprintf(stderr,"Unable to alloc memory\n");
perror("malloc");
return -1;
}

ret=libusb_init(NULL);
if (ret<0){
fprintf(stderr,"Unable to init libusb\n");
perror("libusb_init");
return -1;
}

dev=libusb_open_device_with_vid_pid(NULL,vid,pid);
if (!dev){
fprintf(stderr,"Unable to find device\n");
perror("libusb_open");
return -1;
}

if (libusb_kernel_driver_active(dev, 0) && libusb_detach_kernel_driver(dev, 0)){
fprintf(stderr,"Unable to detach kernel driver\n");
perror("libusb_detach_kernel_driver");
return -1;
}

ret=libusb_claim_interface(dev,0);
if (ret<0){
fprintf(stderr,"Unable to claim interface\n");
perror("libusb_claim_interface");
return -1;
}

if (mode==READ){
int total_read = 0;
while (total_read < length) {
int chunk = (length - total_read) > CHUNK_SIZE ? CHUNK_SIZE : (length - total_read);
ret = libusb_control_transfer(dev, TRANS_TYPE_READ, EEPROM, total_read, LOCATION, buffer, chunk, TIMEOUT);
if (ret != chunk) {
fprintf(stderr,"Read error at %d: expected %d, got %d\n", total_read, chunk, ret);
return -1;
}
fwrite(buffer, 1, ret, stdout);
total_read += ret;
}
fprintf(stderr,"Read %d bytes\n", total_read);
}
else {
int total_written = 0;
while (total_written < length) {
int chunk = (length - total_written) > CHUNK_SIZE ? CHUNK_SIZE : (length - total_written);
ret = fread(buffer, 1, chunk, stdin);
if (ret != chunk) {
fprintf(stderr,"Wrong size from stdin, expected %d read %d\n", chunk, ret);
return -1;
}
ret = libusb_control_transfer(dev, TRANS_TYPE_WRITE, EEPROM, total_written, LOCATION, buffer, chunk, TIMEOUT);
if (ret != chunk) {
fprintf(stderr,"Write error at %d: expected %d, got %d\n", total_written, chunk, ret);
return -1;
}
total_written += chunk;
}
fprintf(stderr,"Written %d bytes\n", total_written);
}

libusb_close(dev);
libusb_exit(NULL);

return 0;
}