I am using a MYS-6ULX-IND board running linux os
I am trying to write to addresses in memory using mmap for the ADC. I have write the following code to read and write to memory for the ADC_CFG location. The problem I an having is that it writes then it is erased immediately. Is there a solution to make it write and save the information in memory?
void *ADCmap;
int fd,i;
unsigned int ADC1_Address,CFG_Value,New_Value;
unsigned int CFG_Settings[16] = {0,0,0,1,1,0,0,0,1,1,0,0,0,0,1,1,1};
CFG_Value = 0;
ADC1_Address = ADC1_BASE;
fd = open("/dev/mem",O_RDWR);
if (fd < 0)
{
perror("Open mem for ADC\n");
return -1;
}
ADCmap = mmap(NULL,4096,PROT_READ | PROT_WRITE,MAP_SHARED,fd,ADC1_Address);
//Set the config register for ADC1
unsigned int *ADC1_CFG = (unsigned int *)(ADCmap + 0x0014);
CFG_Value = *ADC1_CFG;
printf("CFG Register = %u\n",CFG_Value);
for (i = 0;i<sizeof(CFG_Settings);i++)
{
switch(CFG_Settings[i])
{
case 0:
CFG_Value = Bit_Conversion(CFG_Value,i,"CLR");
break;
case 1:
CFG_Value = Bit_Conversion(CFG_Value,i,"SET");
break;
}
}
printf("NEW CFG Value = %u\n",CFG_Value);
*ADC1_CFG = CFG_Value;
close(fd);
munmap(ADCmap,4096);
