Other Parts Discussed in Thread: CC3220SF
Hi,
When I try to read the CHIP ID of BMM150 I get the value 0xFF. The correct CHIP ID value is 0x32. Is there anything wrong with my I2C Code?
/*
* ======== mainThread ========
*/
void *mainThread(void *arg0)
{
unsigned int i;
int8_t MagX, MagY, MagZ;
I2C_Handle i2c;
I2C_Params i2cParams;
/* Call driver init functions */
Display_init();
GPIO_init();
I2C_init();
/* Configure the LED pin */
GPIO_setConfig(Board_GPIO_LED0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
/* Open the HOST display for output */
display = Display_open(Display_Type_UART, NULL);
if (display == NULL) {
while (1);
}
/* Turn on user LED */
GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);
Display_printf(display, 0, 0, "Starting the i2cbme280 example\n");
/* Create I2C for usage */
I2C_Params_init(&i2cParams);
i2cParams.transferMode = I2C_MODE_BLOCKING;
i2cParams.transferCallbackFxn = NULL;
i2cParams.bitRate = I2C_400kHz;
i2c = I2C_open(0, &i2cParams);
if (i2c == NULL) {
Display_printf(display, 0, 0, "Error Initializing I2C\n");
while (1);
}
else {
Display_printf(display, 0, 0, "I2C Initialized!\n");
}
// Init the BME280 API
BMM150_init(i2c, 0x13);
if (!BMM150_open())
{
Display_printf(display, 0, 0, "ERROR opening BMM150_open()\n"); //always go here
}
else
{
Display_printf(display, 0, 0, "BMM150 opened; polling every\r\n");
}
#if 0
/* Take 20 samples and print them out onto the console */
for (i = 0; i < 50; i++)
{
// Read & interpret results, spitting to CIO console
BMM150_ReadNew(&MagX, &MagY, &MagZ);
sprintf(ubuf,
"MagX: %d MagX: %d MagY: %d",
(int16_t)MagX,
(int16_t)MagY,
(int16_t)MagZ);
Display_printf(display, 0, 0, "%s", ubuf);
/* Sleep for 1 second */
sleep(1);
}
#endif
/* Deinitialized I2C */
I2C_close(i2c);
Display_printf(display, 0, 0, "I2C closed!\n");
return (0);
}
bool BMM150_open(void)
{
uint8_t readId;
uint8_t reg_data;
/* Power up the sensor from suspend to sleep mode */
reg_data = BMM150_readReg(BMM150_POWER_CONTROL_ADDR); //0x4B
reg_data = reg_data | BMM150_POWER_CNTRL_ENABLE; //0x01
BMM150_writeReg(BMM150_POWER_CONTROL_ADDR, reg_data);
// Start-up time delay of 3ms
Task_sleep(BMM150_RESET_SETTLING_TIME);
// Find Chip ID
readId = BMM150_readReg(BMM150_CHIP_ID_ADDR); //0x40
if (readId != BMM150_CHIP_ID) { // Not a BMM150? //0x32
return false;
}
return true;
}
/// @brief Write a single 8-bit value to a specified memory address
void BMM150_writeReg(uint8_t memAddress, uint8_t value)
{
I2C_Transaction txn;
uint8_t wrBuf[2];
txn.readBuf = NULL;
txn.readCount = 0;
txn.writeBuf = wrBuf;
txn.writeCount = 2;
txn.slaveAddress = i2cAddr;
wrBuf[0] = memAddress;
wrBuf[1] = value;
I2C_transfer(i2cbus, &txn);
}
/// @brief Read a single 8-bit value from the specified memory address
uint8_t BMM150_readReg(uint8_t memAddress)
{
I2C_Transaction txn;
uint8_t regAddr = memAddress;
uint8_t rdBuf;
txn.readBuf = &rdBuf;
txn.readCount = 1;
txn.writeBuf = ®Addr;
txn.writeCount = 1;
txn.slaveAddress = i2cAddr;
I2C_transfer(i2cbus, &txn);
return rdBuf;
}
-kel
