rt-thread/bsp/efm32/dev_accel.h

/***************************************************************************//**
 * @file 	dev_accel.h
 * @brief 	Accelerometer driver of RT-Thread RTOS for EFM32
 * 	COPYRIGHT (C) 2011, RT-Thread Development Team
 * @author 	onelife
 * @version 0.4 beta
 *******************************************************************************
 * @section License
 * The license and distribution terms for this file may be found in the file 
 * LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
 *******************************************************************************
 * @section Change Logs
 * Date			Author		Notes
 * 2011-07-13	onelife		Initial creation for using EFM32 ADC module to 
 *  interface the Freescale MMA7361L
 * 2011-08-02	onelife		Add digital interface support of using EFM32 IIC 
 *  module for the Freescale MMA7455L
 ******************************************************************************/
#ifndef __DEV_ACCEL_H__
#define __DEV_ACCEL_H__

/* Includes ------------------------------------------------------------------*/
#if (EFM32_USING_ACCEL == EFM32_INTERFACE_IIC)
#include "mma7455l.h"
#endif

/* Exported types ------------------------------------------------------------*/
struct efm32_accel_result_t
{
	rt_int32_t 				x;
	rt_int32_t 				y;
	rt_int32_t 				z;
};

/* Exported constants --------------------------------------------------------*/
/* Exported macro ------------------------------------------------------------*/
/* 	MMA7361LC 
 	g-Select 	g-Range 	Sensitivity
 	0 			1.5 g 		800 mV/g
 	1 			6 g 		206 mV/g

 	MMA7455L
 	g-Select 	g-Range 	Sensitivity
 	0 			2 g 		64 LSB/g
 	1 			4 g 		32 LSB/g
	2			8 g 		16 LSB/g
*/
#define ACCEL_G_SELECT 			(0)

#define ACCEL_CAL_SAMPLES 		(4) 	/* Must be multiple of 2 */
#define ACCEL_CAL_ROUND 		(50)
#define ACCEL_CAL_SIMPLE 		(0)
#define ACCEL_CAL_INTERACT 		(1)

#if (EFM32_USING_ACCEL == EFM32_INTERFACE_ADC)
/* Reading_at_1g = Sensitivity * Max_reading / Refference_voltage */
#define ACCEL_CAL_1G_VALUE 		{993, 256}

#define ACCEL_X_ADC_CH 			ADC_SCANCTRL_INPUTMASK_CH2
#define ACCEL_Y_ADC_CH 			ADC_SCANCTRL_INPUTMASK_CH3
#define ACCEL_Z_ADC_CH 			ADC_SCANCTRL_INPUTMASK_CH4
#elif (EFM32_USING_ACCEL == EFM32_INTERFACE_IIC)
#define ACCEL_CAL_1G_VALUE 		{0x3f, 0x1f, 0x0f}
#define ACCEL_IIC_SLAVE_ADDRESS (0x1d)

#define ACCEL_INT1_PORT			(gpioPortD)
#define ACCEL_INT1_PIN			(13)
#define ACCEL_INT2_PORT 		(gpioPortD)
#define ACCEL_INT2_PIN 			(12)

#define ACCEL_MODE_STANDBY 		(1 << 0)
#define ACCEL_MODE_MEASUREMENT	(1 << 1)
#define ACCEL_MODE_LEVEL		(1 << 2)
#define ACCEL_MODE_PULSE 		(1 << 3)
#define ACCEL_RANGE_8G 			(1 << 4)
#define ACCEL_RANGE_4G 			(1 << 5)
#define ACCEL_RANGE_2G 			(1 << 6)
#define ACCEL_INTPIN_INVERSE 	(1 << 7)
#define ACCEL_INT_LEVEL_PULSE 	(1 << 8)
#define ACCEL_INT_PULSE_LEVEL 	(1 << 9)
#define ACCEL_INT_SINGLE_DOUBLE	(1 << 10)
#define ACCEL_DISABLE_X 		(1 << 11)
#define ACCEL_DISABLE_Y 		(1 << 12)
#define ACCEL_DISABLE_Z 		(1 << 13)
#define ACCEL_THRESHOLD_INTEGER	(1 << 14) 	/* For level detection only */
#define ACCEL_BANDWIDTH_125HZ	(1 << 15)
#define ACCEL_LEVEL_AND			(1 << 16)
#define ACCEL_PULSE_AND			(1 << 17)
#define ACCEL_DRIVE_STRONG		(1 << 18)
#define ACCEL_SOURCE_LEVEL_X 	(1 << 19)
#define ACCEL_SOURCE_LEVEL_Y 	(1 << 20)
#define ACCEL_SOURCE_LEVEL_Z 	(1 << 21)
#define ACCEL_SOURCE_PULSE_X 	(1 << 22)
#define ACCEL_SOURCE_PULSE_Y 	(1 << 23)
#define ACCEL_SOURCE_PULSE_Z 	(1 << 24)

#define ACCEL_SHIFT_MODE 		(0)
#define ACCEL_SHIFT_RANGE 		(4)
#define ACCEL_SHIFT_INT 		(8)
#define ACCEL_SHIFT_DISABLE		(11)
#define ACCEL_SHIFT_SOURCE		(19)

#define ACCEL_MASK_MODE 		(0X0000000f << ACCEL_SHIFT_MODE)
#define ACCEL_MASK_RANGE 		(0X00000007 << ACCEL_SHIFT_RANGE)
#define ACCEL_MASK_INT 			(0X00000007 << ACCEL_SHIFT_INT)
#define ACCEL_MASK_DISABLE 		(0X00000007 << ACCEL_SHIFT_DISABLE)
#define ACCEL_MASK_SOURCE 		(0X0000003f << ACCEL_SHIFT_SOURCE)
#endif

/* Exported functions ------------------------------------------------------- */
rt_err_t efm_accel_get_data(struct efm32_accel_result_t *data, 
	rt_bool_t lowResolution);
rt_err_t efm_accel_config(rt_uint32_t config,
	rt_uint8_t level_threshold,
	rt_uint8_t pulse_threshold,
	rt_uint8_t pulse_duration,
	rt_uint8_t pulse_latency,
	rt_uint8_t pulse_duration2);
rt_err_t efm_accel_auto_zero(rt_uint8_t mode, rt_tick_t period);
rt_err_t efm_accel_init(void);

#endif /*__DEV_ACCEL_H__ */