For some reason I can't get an I2C interface to work on Flexcomm5 on an LPC5506.
I have double checked my code, most of it was generated by the pin and peripheral tools inside MCUXpresso. The SDA and SCL lines never get driven low. I have verified my PCB by changing them to GPIO and making sure they can go low.
I have also tried using the polling method with the same results, no action on the SDA and SCL lines. I have 10k pull up resistors.
Any help will be appreciated
From perhipherals.c
**********************************************************************************************************************/
/* clang-format off */
/* TEXT BELOW IS USED AS SETTING FOR TOOLS *************************************
instance:
- name: 'I2C'
- type: 'flexcomm_i2c'
- mode: 'I2C_Transfer'
- custom_name_enabled: 'true'
- type_id: 'flexcomm_i2c_567d1a9d97c12e5d39b00259c3436dc4'
- functional_group: 'BOARD_InitPeripherals'
- peripheral: 'FLEXCOMM5'
- config_sets:
- transferCfg:
- transfer:
- init_callback: 'true'
- callback_fcn: 'I2C_callback'
- user_data: ''
- init_transfer: 'false'
- master_transfer_cfg:
- flags: 'kI2C_TransferDefaultFlag'
- slaveAddress: '0'
- direction: 'kI2C_Write'
- subaddressSize: '0'
- subaddress: '0'
- dataSize: '32'
- fsl_i2c:
- i2c_mode: 'kI2C_Master'
- clockSource: 'FXCOMFunctionClock'
- clockSourceFreq: 'BOARD_BootClockFRO12M'
- i2c_master_config:
- enableMaster: 'true'
- baudRate_Bps: '100000'
- enableTimeout: 'true'
- interrupt_priority:
- IRQn: 'FLEXCOMM5_IRQn'
- enable_priority: 'false'
- priority: '5'
* BE CAREFUL MODIFYING THIS COMMENT - IT IS YAML SETTINGS FOR TOOLS **********/
/* clang-format on */
const i2c_master_config_t I2C_config = {
.enableMaster = true,
.baudRate_Bps = 100000UL,
.enableTimeout = true
};
i2c_master_handle_t I2C_handle;
static void I2C_init(void) {
RESET_PeripheralReset( kFC5_RST_SHIFT_RSTn);
/* Initialization function */
I2C_MasterInit(I2C_PERIPHERAL, &I2C_config, I2C_CLOCK_SOURCE);
memset(&I2C_handle, 0, sizeof(I2C_handle));
I2C_MasterTransferCreateHandle(I2C_PERIPHERAL, &I2C_handle, I2C_callback, NULL);
}
Peripherals.h
/* BOARD_InitPeripherals defines for FLEXCOMM5 */
/* Definition of peripheral ID */
#define I2C_PERIPHERAL ((I2C_Type *)FLEXCOMM5)
/* Definition of the clock source frequency */
#define I2C_CLOCK_SOURCE 8000000UL
/* I2C interrupt vector ID (number). */
#define I2C_FLEXCOMM_IRQN FLEXCOMM5_IRQn
I2C routines
uint8_t completion_flag;
uint8_t nak_flag;
void I2C_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)
{
completion_flag = true;
}
/* Signal transfer success when received success status. */
if ((status == kStatus_I2C_Nak))
{
nak_flag = true;
}
}
uint8_t i2c_wait(int timeout)
{
uint32_t start_time = tick_counter;
while(1)
{
if(start_time + timeout > start_time)
{
if((start_time + timeout) < tick_counter)
break;
}
else
{
if((start_time + timeout) < tick_counter && tick_counter < (4294967295 - timeout))
break;
}
if(completion_flag)
return 0;
}
return 1;
}
uint8_t i2c_write(uint8_t addr, uint16_t sub_addr, uint8_t sub_addr_len, uint8_t *d, uint8_t len, int timeout)
{
i2c_master_transfer_t i2c_transfer;
memset(&i2c_transfer, 0, sizeof(i2c_transfer));
i2c_transfer.slaveAddress = addr;
i2c_transfer.direction = kI2C_Write;
i2c_transfer.subaddress = sub_addr;
i2c_transfer.subaddressSize = sub_addr_len;
i2c_transfer.data = d;
i2c_transfer.dataSize = len;
i2c_transfer.flags = kI2C_TransferDefaultFlag;
completion_flag = false;
nak_flag = false;
I2C_MasterTransferNonBlocking(I2C_PERIPHERAL, &I2C_handle, &i2c_transfer);
if(i2c_wait(timeout))
return 1;
else
return 0;
}
uint8_t i2c_read(uint8_t addr, uint16_t sub_addr, uint8_t sub_addr_len, uint8_t *d, uint8_t len, int timeout)
{
i2c_master_transfer_t i2c_transfer;
memset(&i2c_transfer, 0, sizeof(i2c_transfer));
i2c_transfer.slaveAddress = addr;
i2c_transfer.direction = kI2C_Read;
i2c_transfer.subaddress = sub_addr;
i2c_transfer.subaddressSize = sub_addr_len;
i2c_transfer.data = d;
i2c_transfer.dataSize = len;
i2c_transfer.flags = kI2C_TransferDefaultFlag;
completion_flag = false;
nak_flag = false;
I2C_MasterTransferNonBlocking(I2C_PERIPHERAL, &I2C_handle, &i2c_transfer);
if(i2c_wait(timeout))
return 1;
else
return 0;
}
