Tool/software:
Hello,
I m using AWR1843boost for my project and flashes OUT_OF_BOX_DEMO which is available on resource explorer. Want to establish communication between AWR1843boost and ICM-20948 through I2C. According tho this understanding created function named WriteI2C and ReadI2C.
So firstly to check I2C was working or not, so want to read ICM-20948 one register which is WHO_I_AM. According to the datasheet of the ICM-20948 register was divided in to 4 bank and WHO_I_AM register is in bank 0. so had to write bank 0 register address first then read the WHO_I_AM register of the ICM-20948. According tho this understanding created function named ReadI2C and WriteI2C.
1.
for write
Slaveadd = ICM-20948 address which is 0x68 according to datasheet
slaveregadd = USER_BANK_0 which address is 0x00
value = NULL
len = 1
int32_t WriteI2C(uint16_t Slaveadd, uint16_t slaveregadd, uint8_t value, uint8_t len)
{
2C_Handle i2cHandle;
I2C_Params i2cParams;
bool retVal = false;
int32_t errCode = 0;
uint32_t i = 0, numTestBytes;
uint32_t arg;
I2C_init();
i2cParams.transferMode = I2C_WRITE_MODE;
i2cParams.bitRate = I2C_100kHz;
/* Open the I2C driver */
i2cHandle = I2C_open(0, &i2cParams);
if (i2cHandle == NULL)
{
System_printf ("Error: I2C Driver Open failed\n");
return -1;
}
arg = 0;
errCode = I2C_control (i2cHandle, I2C_CMD_ADDR_MODE, (void* )&arg);
if (errCode < 0)
{
System_printf ("Error: I2C control Set loopback failed [Error code %d]\n", errCode);
return -1;
}
/* Test write only followed by read only */
memset(&txData1, 0, sizeof (txData1));
// txData1[0] = 0xA;
txData1[0] = slaveregadd;
txData1[1] = value;
numTestBytes = len;
i2cTransaction.slaveAddress = Slaveadd;
i2cTransaction.writeBuf = txData1;
i2cTransaction.writeCount = numTestBytes;
i2cTransaction.readBuf = NULL;
i2cTransaction.readCount = 0;
retVal = I2C_transfer(i2cHandle, &i2cTransaction);
if (retVal == false)
{
System_printf ("Error: I2C Read from Slave failed\n");
return -1;
}
/* Close I2C driver */
I2C_close(i2cHandle);
return 0;
}
2.
for read
Slaveadd = ICM-20948 address which is 0x68 according to datasheet
slaveregadd = WHO_AM_I_REG which address is 0x00
value = NULL
len = 1
int32_t ReadI2C(uint16_t Slaveadd, uint16_t slaveregadd, uint8_t value, uint8_t len)
{
I2C_Handle i2cHandle;
I2C_Params i2cParams;
bool retVal = false;
int32_t errCode = 0;
uint32_t i = 0, numTestBytes;
uint32_t arg;
I2C_init();
i2cParams.transferMode = I2C_READ_MODE;
i2cParams.bitRate = I2C_100kHz;
/* Open the I2C driver */
i2cHandle = I2C_open(0, &i2cParams);
if (i2cHandle == NULL)
{
System_printf ("Error: I2C Driver Open failed\n");
}
/* Configure the I2C device in loopback mode */
arg = 0;
errCode = I2C_control (i2cHandle, I2C_CMD_ADDR_MODE, (void* )&arg);
if (errCode < 0)
{
System_printf ("Error: I2C control Set loopback failed [Error code %d]\n", errCode);
return -1;
}
/* Test write only followed by read only */
// memset(&rxData1, 0, sizeof (rxData1));
// txData1[0] = 0xA;
// txData1[0] = USER_BANK_SEL;
txData1[0] = slaveregadd;
txData1[1] = value;
numTestBytes = len;
i2cTransaction.slaveAddress = Slaveadd;
i2cTransaction.writeBuf = txData1;
i2cTransaction.writeCount = 1;
i2cTransaction.readBuf = rxData1;
i2cTransaction.readCount = numTestBytes;
/* Re-try writing to slave till I2C_transfer returns true */
retVal = I2C_transfer(i2cHandle, &i2cTransaction);
ret = retVal;
if (retVal == false)
{
System_printf ("Error: I2C Read from Slave failed\n");
return -1;
}
/* Close I2C driver */
I2C_close(i2cHandle);
return 0;
}
But, while write the output of the I2C_transfer function was received as -1, so please tell me that my understanding is correct.?, if no so guide me with the right steps for the same.
Regards,
Miit prajapati.
