193 lines
6.0 KiB
C
193 lines
6.0 KiB
C
/******************************************************************//**
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* @file dev_misc.c
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* @brief Miscellaneous drivers of RT-Thread RTOS for EFM32
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* COPYRIGHT (C) 2011, RT-Thread Development Team
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* @author onelife
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* @version 0.4 beta
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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 LICENSE in this
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* 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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* 2011-02-22 onelife Initial creation for EFM32
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*********************************************************************/
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/******************************************************************//**
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* @addtogroup efm32
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* @{
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*********************************************************************/
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/* Includes -------------------------------------------------------------------*/
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#include "board.h"
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#include "drv_adc.h"
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/* Private typedef -------------------------------------------------------------*/
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/* Private define --------------------------------------------------------------*/
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/* Private macro --------------------------------------------------------------*/
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/* Private constants -----------------------------------------------------------*/
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static rt_device_t adc0;
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static struct efm32_adc_control_t control = {ADC_MODE_SINGLE};
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/* Private variables ------------------------------------------------------------*/
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/* Private function prototypes ---------------------------------------------------*/
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rt_int32_t efm32_misc_getCelsius(rt_uint32_t adcSample);
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/* Private functions ------------------------------------------------------------*/
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/******************************************************************//**
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* @brief
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* Get current temperature value in degree celsius
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*
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* @details
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*
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* @note
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*
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* @return
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* Temperature value (signed integer) in degree celsius times 100
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*
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*********************************************************************/
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rt_int32_t rt_hw_get_temp(void)
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{
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ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT;
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rt_uint32_t temp;
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/* Set input to temperature sensor. Acquisition time must be 256 cycles. Reference must
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be 1.25V */
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singleInit.acqTime = adcAcqTime32;
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singleInit.reference = adcRef1V25;
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singleInit.input = adcSingleInpTemp;
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control.singleInit = &singleInit;
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adc0->control(adc0, RT_DEVICE_CTRL_ADC_MODE, &control);
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adc0->control(adc0, RT_DEVICE_CTRL_RESUME, EFM32_NO_POINTER);
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adc0->control(adc0, RT_DEVICE_CTRL_ADC_RESULT, &temp);
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return efm32_misc_getCelsius(temp);
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}
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/******************************************************************//**
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* @brief
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* Get current VDD value in volt
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*
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* @details
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*
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* @note
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*
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* @return
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* VDD value (unsigned integer) in volt times 100
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*
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*********************************************************************/
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rt_uint32_t rt_hw_get_vdd(void)
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{
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ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT;
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rt_uint32_t vdd;
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/* Set input to temperature sensor. Reference must be 1.25V */
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singleInit.acqTime = adcAcqTime32;
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singleInit.reference = adcRef1V25;
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singleInit.input = adcSingleInpVDDDiv3;
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control.singleInit = &singleInit;
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adc0->control(adc0, RT_DEVICE_CTRL_ADC_MODE, &control);
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adc0->control(adc0, RT_DEVICE_CTRL_RESUME, EFM32_NO_POINTER);
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adc0->control(adc0, RT_DEVICE_CTRL_ADC_RESULT, &vdd);
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return (vdd * 125 * 3) / 4096;
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}
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/******************************************************************//**
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* @brief
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* Initialize all the miscellaneous drivers
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*
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* @details
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*
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* @note
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*
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* @return
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* Error code
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*********************************************************************/
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rt_err_t rt_hw_misc_init(void)
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{
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adc0 = rt_device_find(RT_ADC0_NAME);
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if (adc0 == RT_NULL)
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{
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#ifdef RT_MISC_DEBUG
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rt_kprintf("Batt err: Can't find device: %s!\n", RT_ADC0_NAME);
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#endif
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goto MISC_INIT_ERROR;
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}
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return RT_EOK;
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MISC_INIT_ERROR:
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#ifdef RT_MISC_DEBUG
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rt_kprintf("Misc err: Init failed!\n");
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#endif
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return -RT_ERROR;
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}
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/**************************************************************************//**
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* @brief
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* Convert ADC result to degree celsius.
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*
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* @details
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*
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* @note
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* See section 2.3.4 in the reference manual for details on this calculatoin
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*
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* @param adcResult
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* Raw value from ADC to be converted to celsius
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*
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* @return
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* The temperature value (signed integer) in degrees celsius times 100
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*
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*****************************************************************************/
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rt_int32_t efm32_misc_getCelsius(rt_uint32_t adcResult)
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{
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/* Factory calibration temperature from device information page. */
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rt_int32_t cal_temp = ((DEVINFO->CAL & _DEVINFO_CAL_TEMP_MASK) \
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>> _DEVINFO_CAL_TEMP_SHIFT) * 100;
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/* Factory calibration value from device information page. */
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rt_int32_t cal_value = ((DEVINFO->ADC0CAL2 & _DEVINFO_ADC0CAL2_TEMP1V25_MASK) \
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>> _DEVINFO_ADC0CAL2_TEMP1V25_SHIFT) * 10000;
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/* Temperature gradient (from datasheet) in (ADC unit / degree celsius * 100) */
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rt_int32_t t_grad = -385;
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return (cal_temp - (cal_value - (rt_int32_t)adcResult * 10000) / t_grad);
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}
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/*********************************************************************
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* Export to FINSH
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*********************************************************************/
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#ifdef RT_USING_FINSH
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#include <finsh.h>
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void list_temp(void)
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{
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rt_int32_t temp = rt_hw_get_temp();
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rt_kprintf("Temperature is %2d.%02d C\n", temp / 100, temp % 100);
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}
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FINSH_FUNCTION_EXPORT(list_temp, list current temperature value.)
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void list_vdd(void)
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{
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rt_uint32_t vdd = rt_hw_get_vdd();
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rt_kprintf("VDD is %1d.%02d V\n", vdd / 100, vdd % 100);
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}
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FINSH_FUNCTION_EXPORT(list_vdd, list current VDD value.)
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#endif
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/******************************************************************//**
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* @}
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*********************************************************************/
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