tap_detection.c

#include <stdio.h>
#include "bma400.h"

void set_interface(enum bma400_intf intf, struct bma400_dev *dev);
void delay_ms(uint32_t period);
int8_t i2c_reg_write(void *intf_ptr, uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
int8_t i2c_reg_read(void *intf_ptr, uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
int8_t spi_reg_write(void *intf_ptr, uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
int8_t spi_reg_read(void *intf_ptr, uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length);
void print_rslt(int8_t rslt);

int main(int argc, char const *argv[])
{
	struct bma400_dev bma;
	struct bma400_int_enable tap_int[2];
	struct bma400_sensor_conf conf[2];
	int8_t rslt;
	uint32_t poll_period = 5, test_dur_ms = 30000;
	uint16_t int_status;

	set_interface(BMA400_SPI_INTF, &bma);

	rslt = bma400_init(&bma);
	print_rslt(rslt);

	rslt = bma400_soft_reset(&bma);
	print_rslt(rslt);

	conf[0].type = BMA400_ACCEL;
	conf[1].type = BMA400_TAP_INT;

	rslt = bma400_get_sensor_conf(conf, 2, &bma);
	print_rslt(rslt);

	conf[0].param.accel.odr = BMA400_ODR_200HZ;
	conf[0].param.accel.range = BMA400_4G_RANGE;
	conf[0].param.accel.data_src = BMA400_DATA_SRC_ACCEL_FILT_1;
	conf[0].param.accel.filt1_bw = BMA400_ACCEL_FILT1_BW_1;

	conf[1].param.tap.int_chan = BMA400_UNMAP_INT_PIN;
	conf[1].param.tap.axes_sel = BMA400_Z_AXIS_EN_TAP;
	conf[1].param.tap.sensitivity = BMA400_TAP_SENSITIVITY_0;

	rslt = bma400_set_sensor_conf(conf, 2, &bma);
	print_rslt(rslt);

	bma.delay_ms(100);

	tap_int[0].type = BMA400_SINGLE_TAP_INT_EN;
	tap_int[0].conf = BMA400_ENABLE;

	tap_int[1].type = BMA400_DOUBLE_TAP_INT_EN;
	tap_int[1].conf = BMA400_ENABLE;

	rslt = bma400_enable_interrupt(tap_int, 2, &bma);
	print_rslt(rslt);

	bma.delay_ms(100);

	rslt = bma400_set_power_mode(BMA400_NORMAL_MODE, &bma);
	print_rslt(rslt);

	bma.delay_ms(100);

	if (rslt == BMA400_OK) {
		printf("Tap configured.\r\n");

		while (test_dur_ms) {
			bma.delay_ms(poll_period);

			rslt = bma400_get_interrupt_status(&int_status, &bma);
			print_rslt(rslt);

			if (int_status & BMA400_S_TAP_INT_ASSERTED) {
				printf("Single tap detected!\r\n");
			}

			if (int_status & BMA400_D_TAP_INT_ASSERTED) {
				printf("Double tap detected!\r\n");
			}

			test_dur_ms -= poll_period;
		}

	}

	return 0;
}

void set_interface(enum bma400_intf intf, struct bma400_dev *dev)
{
	switch (intf) {
	case BMA400_I2C_INTF:
		dev->intf_ptr = NULL; /* To attach your interface device reference */
		dev->delay_ms = delay_ms;
		dev->dev_id = BMA400_I2C_ADDRESS_SDO_LOW;
		dev->read = i2c_reg_read;
		dev->write = i2c_reg_write;
		dev->intf = BMA400_I2C_INTF;
		break;
	case BMA400_SPI_INTF:
		dev->intf_ptr = NULL; /* To attach your interface device reference */
		dev->dev_id = 0; /* Could be used to identify the chip select line. */
		dev->read = spi_reg_read;
		dev->write = spi_reg_write;
		dev->intf = BMA400_SPI_INTF;
		break;
	default:
		printf("Interface not supported.\r\n");
	}
}

void delay_ms(uint32_t period)
{
	/* Wait for a period amount of ms*/
}

int8_t i2c_reg_write(void *intf_ptr, uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
	/* Write to registers using I2C. Return 0 for a successful execution. */
	return -1;
}

int8_t i2c_reg_read(void *intf_ptr, uint8_t i2c_addr, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
	/* Read from registers using I2C. Return 0 for a successful execution. */
	return -1;
}

int8_t spi_reg_write(void *intf_ptr, uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
	/* Write to registers using SPI. Return 0 for a successful execution. */
	return -1;
}

int8_t spi_reg_read(void *intf_ptr, uint8_t cs, uint8_t reg_addr, uint8_t *reg_data, uint16_t length)
{
	/* Read from registers using SPI. Return 0 for a successful execution. */
	return -1;
}

void print_rslt(int8_t rslt)
{
	switch (rslt) {
	case BMA400_OK:
		/* Do nothing */
		break;
	case BMA400_E_NULL_PTR:
		printf("Error [%d] : Null pointer\r\n", rslt);
		break;
	case BMA400_E_COM_FAIL:
		printf("Error [%d] : Communication failure\r\n", rslt);
		break;
	case BMA400_E_DEV_NOT_FOUND:
		printf("Error [%d] : Device not found\r\n", rslt);
		break;
	case BMA400_E_INVALID_CONFIG:
		printf("Error [%d] : Invalid configuration\r\n", rslt);
		break;
	case BMA400_W_SELF_TEST_FAIL:
		printf("Warning [%d] : Self test failed\r\n", rslt);
		break;
	default:
		printf("Error [%d] : Unknown error code\r\n", rslt);
		break;
	}
}