Hello,
I would like to use Nordic SDK libraries (currently I'm using SDK 17.0.2) to read and write on a FM24CL16B I2C F-RAM.
This device has the following writing workflow:
Following Nordic TWI example, the piece of code I'm using to write values 0x7A and 0x7B at 0x00 and 0x01 memory addresses:
static const nrf_drv_twi_t twi_instance = NRF_DRV_TWI_INSTANCE( 1 ); // Instance of TWI master driver that will be used for communication
ret_code_t err_code;
static uint8_t reg_addr = 0x00;
static uint8_t p_buff[5] = {0x7A, 0x7B, 0x83, 0x84, 0x85};
static const nrf_drv_twi_config_t twi_config = {
.scl = TWI_SCL_PIN, // SCL pin number.
.sda = TWI_SDA_PIN, // SDA pin number.
.frequency = NRF_DRV_TWI_FREQ_100K, // TWI frequency.
.interrupt_priority = TWI_IRQ_PRIORITY, // Interrupt priority.
.clear_bus_init = false, // Clear bus during init.
.hold_bus_uninit = false // Hold pull up state on gpio pins after uninit.
};
err_code = nrf_drv_twi_init( &twi_instance, &twi_config, NULL, NULL );
APP_ERROR_CHECK( err_code );
nrf_drv_twi_enable( &twi_instance ); // enable I2C
err_code = nrf_drv_twi_tx( &twi_instance, 0x50, ®_addr, 1, true );
APP_ERROR_CHECK( err_code );
err_code = nrf_drv_twi_tx( &twi_instance, 0x50, p_buff, 2, false );
APP_ERROR_CHECK( err_code );
nrf_drv_twi_disable( &twi_instance );
Using this library the problem I have is that the start condition and the slave address are sent twice, and the writing on the memory does not happen correctly.
Due to double sending, the value 0x7B is written to the address 0x7A:
Could you give me some hints to set the code correctly?
Thanks!
