RE: C advice with app_twi peripheral configuration

Sensors — Tue, 22 Dec 2015 15:54:48 GMT

I was sort of looking for a way to expand the configuration array neatly, I think I found a way that works okay by using a 3d array:

void LSM303_config(app_twi_t *m_app_twi)
{
	// Default configuration array
	uint8_t default_config[][2] = {
		{LSM303_ACC_CTRL_REG1_A, ODR_10Hz | Acc_X_EN | Acc_Y_EN | Acc_Z_EN},
		{LSM303_ACC_CTRL_REG2_A, 0x00}
	};

	// Queue transfers
	app_twi_transfer_t const lsm303_cfg_transfers[2] = {
		APP_TWI_WRITE(LSM303_ADDRESS_ACCEL, default_config[0], 2, 0),
		APP_TWI_WRITE(LSM303_ADDRESS_ACCEL, default_config[1], 2, 0)
	};
	
	APP_ERROR_CHECK( app_twi_perform(m_app_twi, lsm303_cfg_transfers, 2, NULL) );
}

RE: C advice with app_twi peripheral configuration

Petter Myhre — Mon, 21 Dec 2015 15:15:02 GMT

I don't know of any neater way, it seems you have found the TWI Transaction Manager Example, I would follow the implementation used there.

For how to send multiple commands you can have a look at the TWI transaction manager library documentation.