Hello every one ,
I m using Mv4 on EVMDM355.
I want to use J30 & J31 as general purpose GPIO pins.
For that I need to change the MUX select line via MS0430 using I2C.
To do so, I ve used i2c-dev interface here is the code..
This is just to test I2C , so I tried to toggle LEDs on MSP430
//********************************************************************************
// test_i2c.c
//********************************************************************************
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <getopt.h>
#include <errno.h>
#include "i2c-dev.h"
#define __E(fmt, args...) fprintf(stderr, "i2ctest Error: " fmt, ## args)
#define I2C_DEVICE "/dev/i2c/0"
#define I2C_DEV_ADDR 0x25 // address of MSP430
int init_i2c(void)
{
int fd;
fd = open(I2C_DEVICE, O_RDWR);
if (fd < 0) {
__E("Error while opening i2c device %s\n", I2C_DEVICE);
return fd;
}
if (ioctl(fd, I2C_SLAVE, I2C_DEV_ADDR) == -1) {
__E("Failed to set I2C_SLAVE %#x\n", I2C_DEV_ADDR);
return -1;
}
return fd;
}
int main(int argc, char **argv)
{
int i2cfd;
__u8 buf[256];
i2cfd = init_i2c();
buf[0] = 0x03;
buf[1] = 0xFF;
write(i2cfd, buf, 1);
read(i2cfd, buf, 2);
printf("data on Address %x is %x \n",buf[0], buf[1]);
buf[0] = 0x03;
buf[1] = 0x00;
write(i2cfd, buf, 1);
read(i2cfd, buf, 2);
printf("data on Address %x is %x \n",buf[0], buf[1]);
close(i2cfd);
exit(EXIT_SUCCESS);
}
//************************************************************************
// here is the log when I run this application...
//************************************************************************
root@192.168.2.229:/home# ./test_i2c
data on Address 3 is ff
data on Address 3 is 0
//************************************************************************
// Kernel MSges
//************************************************************************
DaVinci I2C WARNING: timeout waiting for bus ready
DaVinci I2C WARNING: timeout waiting for bus ready
DaVinci I2C WARNING: timeout waiting for bus ready
SUCCESS gpio_direction_input(CORE)
SUCCESS gpio_direction_output(CORE)
SUCCESS __gpio_set(CORE)
MUX: initialized GPIO14
MUX: initialized GPIO15
SUCCESS __gpio_set(CORE)
SUCCESS __gpio_set(CORE)
.
.
.
SUCCESS __gpio_set(CORE)
SUCCESS __gpio_set(CORE)
SUCCESS __gpio_set(CORE)
MUX: initialized I2C_SDA
MUX: initialized I2C_SCL
//*****************************************************************
Though the reading and witting in file done successfully (I think so ;) ),but the LEDs are "ON" throughout..:(
I have used printk in gpio.c file.
I am also getting the same "DaVinci I2C WARNING: timeout waiting for bus ready"while boot up.While booting it also shows i2c error -111.
Please help.
If you know any other simple way to change mux position than tell me ASAP.Thx in advance.
