I have been trying for several days to get the MAX11616 running on a custom HAT with a Raspberry Pi 4 in C. With the current setup, if I only select channel 0, I get valid measurements. But anything above channel 0 and the readings are all the same. I hope someone can point out the error of my way. Here is the code; I tried adding code from the insert, but the OK did nothing
int i2c_ADC = -1;
uint8_t ADC_add = 0x35;
uint8_t setup = 0xD2;//0xF2; // Correct setup byte
uint16_t raw;
void ADC_Init(void)
{
i2c_ADC = open("/dev/i2c-1", O_RDWR);
if (i2c_ADC < 0) { perror("open"); exit(1); }
if (ioctl(i2c_ADC, I2C_SLAVE, ADC_add) < 0) { perror("ioctl"); exit(1); }
usleep(5000); // power-up delay
// Send setup byte
if (write(i2c_ADC, &setup, 1) != 1)
{
perror("write setup");
exit(1);
}
usleep(5000); // allow init to take hold
}
void ADC_Read(void)
{
uint8_t data[2];
uint8_t config = 0x0F; // SCAN=00, CS=11, SGL=1
int counter;
write(i2c_ADC, &config, 1);
ioctl(i2c_ADC, I2C_SLAVE, ADC_add); // forces STOP
usleep(50); // let the chip settle
// Dummy read — throw away the first conversion
read(i2c_ADC, data, 2);
// read all 12 channels
for (counter = 0; counter < 12; counter++)
{
if (read(i2c_ADC, data, 2) != 2)
{
perror("read data");
return;
}
data[0] = data[0] & 0x0f;
ADC_Array[counter] = ((data[0] << 8) | data[1]);
}
//display data
for (counter = 0; counter < 12; counter++)
{
printf("ADC_Array[%d] = %04x\n",counter, ADC_Array[counter]);
}
}
Kind regards,
David
