Hi,
I am using I2C lpc54618 for connecting multiple sensors on the same I2C bus with 3.3K pull-up resistor(3.3v).
I am able to read and write data using I2C (Single slave sensor not multiple)of lpc54618 on flexcomm2 but not flexcomm6.
In pinmux I have initialized port1_12 ,port1_13 and port1_14 as below to use for multiple sensors.
//I2C6 SCL
const uint32_t port1_pin12_config = (
IOCON_PIO_FUNC2 | /* Pin is configured as FC6_TXD_SCL_MISO */
IOCON_PIO_MODE_PULLUP | /* Selects pull-up function */
IOCON_PIO_INV_DI | /* Input function is not inverted */
IOCON_PIO_DIGITAL_EN | /* Enables digital function */
IOCON_PIO_INPFILT_OFF | /* Input filter disabled */
IOCON_PIO_OPENDRAIN_DI /* Open drain is disabled */
);
IOCON_PinMuxSet(IOCON, PORT1_IDX, PIN12_IDX, port1_pin12_config); /* PORT1 PIN12 (coords: N5) is configured as FC6_SCK */
//I2C6 SDA
const uint32_t port1_pin13_config = (
IOCON_PIO_FUNC2 | /* Pin is configured as FC6_TXD_SCL_MISO */
IOCON_PIO_MODE_PULLUP | /* Selects pull-up function */
IOCON_PIO_INV_DI | /* Input function is not inverted */
IOCON_PIO_DIGITAL_EN | /* Enables digital function */
IOCON_PIO_INPFILT_OFF | /* Input filter disabled */
IOCON_PIO_OPENDRAIN_DI /* Open drain is disabled */
);
IOCON_PinMuxSet(IOCON, PORT1_IDX, PIN13_IDX, port1_pin13_config); /* PORT1 PIN13 (coords: N5) is configured as FC6_RXD_SDA_MOSI_DATA */
//INTR pin
const uint32_t port1_pin14_config = (
IOCON_PIO_FUNC0 | /*INTR PIN*/
IOCON_PIO_MODE_PULLUP | /* Selects pull-up function */
IOCON_PIO_INV_DI | /* Input function is not inverted */
IOCON_PIO_DIGITAL_EN | /* Enables digital function */
IOCON_PIO_INPFILT_OFF | /* Input filter disabled */
IOCON_PIO_OPENDRAIN_DI /* Open drain is disabled */
);
IOCON_PinMuxSet(IOCON, PORT1_IDX, PIN14_IDX, port1_pin14_config); /* PORT1 PIN14 (coords: N5) is configured INTR pin */
Similar to port1_14 I have configured port1_15 and port1_16 for other sensors.
I have configured lpc54618 as master as below:-
#define EXAMPLE_I2C6_MASTER_BASE (I2C6_BASE)
#define I2C_MASTER_CLOCK_FREQUENCY (12000000)
#define EXAMPLE_I2C6_MASTER ((I2C_Type *)EXAMPLE_I2C6_MASTER_BASE)
#define I2C_MASTER_SLAVE_ADDR_7BIT SENSOR_I2C_ADDRESS
#define I2C_BAUDRATE (400000) /* 100K */
#define I2C_DATA_LENGTH (8) /* MAX is 256 */
i2c_master_handle_t g_m_handle;
volatile bool g_MasterCompletionFlag = false;
i2c_master_config_t masterConfig;
uint8_t status;
status_t result = kStatus_Success;
uint8_t txBuff[I2C_DATA_LENGTH];
i2c_master_transfer_t masterXfer;
char DataReady;
static void i2c_master_callback(I2C_Type *base, i2c_master_handle_t *handle, status_t status, void *userData)
{
/* Signal transfer success when received success status. */
if (status == kStatus_Success)
{
g_MasterCompletionFlag = true;
}
}
.
.
.
.
CLOCK_AttachClk(kFRO12M_to_FLEXCOMM6);
RESET_PeripheralReset(kFC6_RST_SHIFT_RSTn);
NVIC_SetPriority(FLEXCOMM6_IRQn, 1);
/* Get default configuration for master. */
I2C_MasterGetDefaultConfig(&masterConfig);
masterConfig.baudRate_Bps = I2C_BAUDRATE;
/* Init I2C master. */
I2C_MasterInit(EXAMPLE_I2C6_MASTER, &masterConfig, I2C_MASTER_CLOCK_FREQUENCY);
I2C_MasterTransferCreateHandle(EXAMPLE_I2C6_MASTER, &g_m_handle, i2c_master_callback, NULL);
.
.
.
.
.
Following are the read and write functions for I2C based sensor registers
uint32_t sensor_i2c_register_write(uint8_t register_address, uint8_t value)
{
status_t reVal = kStatus_Fail;
txBuff[0] = register_address;
txBuff[1] = value;
masterXfer.slaveAddress = I2C_MASTER_SLAVE_ADDR_7BIT;
masterXfer.direction = kI2C_Write;
masterXfer.subaddress = 0;
masterXfer.subaddressSize = 0;
masterXfer.data = txBuff;
masterXfer.dataSize = 2;
masterXfer.flags = kI2C_TransferDefaultFlag;
reVal = I2C_MasterTransferNonBlocking(EXAMPLE_I2C6_MASTER, &g_m_handle, &masterXfer);
if (reVal != kStatus_Success)
{
return kStatus_Fail;
}
/* Wait for transfer completed. */
while (!g_MasterCompletionFlag)
{
}
g_MasterCompletionFlag = false;
return kStatus_Success;
}
uint32_t sensor_i2c_register_read(uint8_t first_reg_address, uint8_t * p_destination, uint8_t num_bytes)
{
status_t reVal = kStatus_Fail;
txBuff[0] = first_reg_address;
masterXfer.slaveAddress = I2C_MASTER_SLAVE_ADDR_7BIT;
masterXfer.direction = kI2C_Write;
masterXfer.subaddress = 0;
masterXfer.subaddressSize = 0;
masterXfer.data = txBuff;
masterXfer.dataSize = 1;
masterXfer.flags = kI2C_TransferNoStopFlag;
reVal = I2C_MasterTransferNonBlocking(EXAMPLE_I2C6_MASTER, &g_m_handle, &masterXfer);
if (reVal != kStatus_Success)
{
return kStatus_Fail;
}
/* Wait for transfer completed. */
while (!g_MasterCompletionFlag)
{
}
g_MasterCompletionFlag = false;
masterXfer.slaveAddress = I2C_MASTER_SLAVE_ADDR_7BIT;
masterXfer.direction = kI2C_Read;
masterXfer.subaddress = 0;
masterXfer.subaddressSize = 0;
masterXfer.data = p_destination;
masterXfer.dataSize = num_bytes;
masterXfer.flags = kI2C_TransferRepeatedStartFlag;
reVal = I2C_MasterTransferNonBlocking(EXAMPLE_I2C6_MASTER, &g_m_handle, &masterXfer);
if (reVal != kStatus_Success)
{
return kStatus_Fail;
}
/* Wait for transfer completed. */
while (!g_MasterCompletionFlag)
{
}
g_MasterCompletionFlag = false;
return reVal;
}
when I try to read data from sensors from flexcomm6( port1_12 and port1_13) no data is given back and MCU stops executing further code.
Could anyone please provide me some pointers for..
1] Are there any special config needed for master to connect to one slave or many slave?
2] are register read/write i2c functions correct?
