2013-01-08 22:40:58 +08:00
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/***************************************************************************//**
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* @file dev_accel.h
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* @brief Accelerometer driver of RT-Thread RTOS for EFM32
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* COPYRIGHT (C) 2012, RT-Thread Development Team
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* @author onelife
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* @version 1.0
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*******************************************************************************
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* @section License
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* The license and distribution terms for this file may be found in the file
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* LICENSE in this distribution or at http://www.rt-thread.org/license/LICENSE
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*******************************************************************************
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* @section Change Logs
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* Date Author Notes
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* 2011-07-13 onelife Initial creation for using EFM32 ADC module to
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* interface the Freescale MMA7361L
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* 2011-08-02 onelife Add digital interface support of using EFM32 IIC
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* module for the Freescale MMA7455L
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******************************************************************************/
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#ifndef __DEV_ACCEL_H__
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#define __DEV_ACCEL_H__
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/* Includes ------------------------------------------------------------------*/
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#if (EFM32_USING_ACCEL == EFM32_INTERFACE_IIC)
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#include "mma7455l.h"
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#endif
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/* Exported types ------------------------------------------------------------*/
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struct efm32_accel_result_t
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{
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rt_int32_t x;
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rt_int32_t y;
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rt_int32_t z;
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};
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/* Exported constants --------------------------------------------------------*/
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/* Exported macro ------------------------------------------------------------*/
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/* MMA7361LC
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g-Select g-Range Sensitivity
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0 1.5 g 800 mV/g
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1 6 g 206 mV/g
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MMA7455L
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g-Select g-Range Sensitivity
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0 2 g 64 LSB/g
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1 4 g 32 LSB/g
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2 8 g 16 LSB/g
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*/
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#define ACCEL_G_SELECT (0)
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#define ACCEL_CAL_SAMPLES (4) /* Must be multiple of 2 */
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#define ACCEL_CAL_ROUND (50)
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#define ACCEL_CAL_SIMPLE (0)
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#define ACCEL_CAL_INTERACT (1)
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#if (EFM32_USING_ACCEL == EFM32_INTERFACE_ADC)
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/* Reading_at_1g = Sensitivity * Max_reading / Refference_voltage */
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#define ACCEL_CAL_1G_VALUE {993, 256}
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#define ACCEL_X_ADC_CH ADC_SCANCTRL_INPUTMASK_CH2
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#define ACCEL_Y_ADC_CH ADC_SCANCTRL_INPUTMASK_CH3
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#define ACCEL_Z_ADC_CH ADC_SCANCTRL_INPUTMASK_CH4
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#elif (EFM32_USING_ACCEL == EFM32_INTERFACE_IIC)
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#define ACCEL_CAL_1G_VALUE {0x3f, 0x1f, 0x0f}
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#define ACCEL_IIC_SLAVE_ADDRESS (0x1d)
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#define ACCEL_INT1_PORT (gpioPortD)
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#define ACCEL_INT1_PIN (13)
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#define ACCEL_INT2_PORT (gpioPortD)
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#define ACCEL_INT2_PIN (12)
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#define ACCEL_MODE_STANDBY (1 << 0)
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#define ACCEL_MODE_MEASUREMENT (1 << 1)
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#define ACCEL_MODE_LEVEL (1 << 2)
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#define ACCEL_MODE_PULSE (1 << 3)
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#define ACCEL_RANGE_8G (1 << 4)
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#define ACCEL_RANGE_4G (1 << 5)
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#define ACCEL_RANGE_2G (1 << 6)
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#define ACCEL_INTPIN_INVERSE (1 << 7)
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#define ACCEL_INT_LEVEL_PULSE (1 << 8)
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#define ACCEL_INT_PULSE_LEVEL (1 << 9)
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#define ACCEL_INT_SINGLE_DOUBLE (1 << 10)
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#define ACCEL_DISABLE_X (1 << 11)
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#define ACCEL_DISABLE_Y (1 << 12)
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#define ACCEL_DISABLE_Z (1 << 13)
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#define ACCEL_THRESHOLD_INTEGER (1 << 14) /* For level detection only */
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#define ACCEL_BANDWIDTH_125HZ (1 << 15)
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#define ACCEL_LEVEL_AND (1 << 16)
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#define ACCEL_PULSE_AND (1 << 17)
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#define ACCEL_DRIVE_STRONG (1 << 18)
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#define ACCEL_SOURCE_LEVEL_X (1 << 19)
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#define ACCEL_SOURCE_LEVEL_Y (1 << 20)
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#define ACCEL_SOURCE_LEVEL_Z (1 << 21)
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#define ACCEL_SOURCE_PULSE_X (1 << 22)
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#define ACCEL_SOURCE_PULSE_Y (1 << 23)
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#define ACCEL_SOURCE_PULSE_Z (1 << 24)
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#define ACCEL_SHIFT_MODE (0)
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#define ACCEL_SHIFT_RANGE (4)
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#define ACCEL_SHIFT_INT (8)
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#define ACCEL_SHIFT_DISABLE (11)
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#define ACCEL_SHIFT_SOURCE (19)
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#define ACCEL_MASK_MODE (0X0000000f << ACCEL_SHIFT_MODE)
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#define ACCEL_MASK_RANGE (0X00000007 << ACCEL_SHIFT_RANGE)
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#define ACCEL_MASK_INT (0X00000007 << ACCEL_SHIFT_INT)
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#define ACCEL_MASK_DISABLE (0X00000007 << ACCEL_SHIFT_DISABLE)
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#define ACCEL_MASK_SOURCE (0X0000003f << ACCEL_SHIFT_SOURCE)
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#endif
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/* Exported functions ------------------------------------------------------- */
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rt_err_t efm_accel_get_data(struct efm32_accel_result_t *data,
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rt_bool_t lowResolution);
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rt_err_t efm_accel_config(rt_uint32_t config,
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rt_uint8_t level_threshold,
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rt_uint8_t pulse_threshold,
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rt_uint8_t pulse_duration,
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rt_uint8_t pulse_latency,
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rt_uint8_t pulse_duration2);
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rt_err_t efm_accel_auto_zero(rt_uint8_t mode, rt_tick_t period);
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rt_err_t efm_accel_init(void);
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#endif /*__DEV_ACCEL_H__ */
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