199 lines
6.3 KiB
C
199 lines
6.3 KiB
C
/*
|
|
* Copyright (c) 2006-2022, RT-Thread Development Team
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2011-02-22 onelife Initial creation for EFM32
|
|
* 2011-07-27 onelife Modify according to ADC driver changes
|
|
*/
|
|
|
|
/***************************************************************************//**
|
|
* @addtogroup efm32
|
|
* @{
|
|
******************************************************************************/
|
|
|
|
/* Includes ------------------------------------------------------------------*/
|
|
#include "board.h"
|
|
#include "drv_adc.h"
|
|
|
|
#if defined(RT_USING_MISC)
|
|
/* Private typedef -----------------------------------------------------------*/
|
|
/* Private define ------------------------------------------------------------*/
|
|
/* Private macro -------------------------------------------------------------*/
|
|
#ifdef RT_MISC_DEBUG
|
|
#define misc_debug(format,args...) rt_kprintf(format, ##args)
|
|
#else
|
|
#define misc_debug(format,args...)
|
|
#endif
|
|
|
|
/* Private constants ---------------------------------------------------------*/
|
|
static rt_device_t adc0;
|
|
static struct efm32_adc_control_t control = \
|
|
{ADC_MODE_SINGLE, {}, {0, (rt_uint8_t)EFM32_NO_DMA}};
|
|
|
|
/* Private variables ---------------------------------------------------------*/
|
|
/* Private function prototypes -----------------------------------------------*/
|
|
rt_int32_t efm32_misc_getCelsius(rt_uint32_t adcSample);
|
|
|
|
/* Private functions ---------------------------------------------------------*/
|
|
/***************************************************************************//**
|
|
* @brief
|
|
* Get current temperature value in degree celsius
|
|
*
|
|
* @details
|
|
*
|
|
* @note
|
|
*
|
|
* @return
|
|
* Temperature value (signed integer) in degree celsius times 100
|
|
*
|
|
******************************************************************************/
|
|
rt_int32_t rt_hw_get_temp(void)
|
|
{
|
|
ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT;
|
|
struct efm32_adc_result_t result;
|
|
rt_uint32_t temp;
|
|
|
|
/* Set input to temperature sensor. Acquisition time must be 256 cycles.
|
|
Reference must be 1.25V */
|
|
singleInit.acqTime = adcAcqTime32;
|
|
singleInit.reference = adcRef1V25;
|
|
singleInit.input = adcSingleInpTemp;
|
|
|
|
control.single.init = &singleInit;
|
|
adc0->control(adc0, RT_DEVICE_CTRL_ADC_MODE, &control);
|
|
result.mode = control.mode;
|
|
result.buffer = (void *)&temp;
|
|
adc0->control(adc0, RT_DEVICE_CTRL_RESUME, &result);
|
|
adc0->control(adc0, RT_DEVICE_CTRL_ADC_RESULT, &result);
|
|
|
|
return efm32_misc_getCelsius(temp);
|
|
}
|
|
|
|
/***************************************************************************//**
|
|
* @brief
|
|
* Get current VDD value in volt
|
|
*
|
|
* @details
|
|
*
|
|
* @note
|
|
*
|
|
* @return
|
|
* VDD value (unsigned integer) in volt times 100
|
|
*
|
|
******************************************************************************/
|
|
rt_uint32_t rt_hw_get_vdd(void)
|
|
{
|
|
ADC_InitSingle_TypeDef singleInit = ADC_INITSINGLE_DEFAULT;
|
|
struct efm32_adc_result_t result;
|
|
rt_uint32_t vdd;
|
|
|
|
/* Set input to temperature sensor. Reference must be 1.25V */
|
|
singleInit.acqTime = adcAcqTime32;
|
|
singleInit.reference = adcRef1V25;
|
|
singleInit.input = adcSingleInpVDDDiv3;
|
|
|
|
control.single.init = &singleInit;
|
|
adc0->control(adc0, RT_DEVICE_CTRL_ADC_MODE, &control);
|
|
result.mode = control.mode;
|
|
result.buffer = (void *)&vdd;
|
|
adc0->control(adc0, RT_DEVICE_CTRL_RESUME, &result);
|
|
adc0->control(adc0, RT_DEVICE_CTRL_ADC_RESULT, &result);
|
|
|
|
return (vdd * 125 * 3) / 4096;
|
|
}
|
|
|
|
/***************************************************************************//**
|
|
* @brief
|
|
* Initialize all the miscellaneous drivers
|
|
*
|
|
* @details
|
|
*
|
|
* @note
|
|
*
|
|
* @return
|
|
* Error code
|
|
******************************************************************************/
|
|
rt_err_t rt_hw_misc_init(void)
|
|
{
|
|
do
|
|
{
|
|
/* Find ADC device */
|
|
adc0 = rt_device_find(RT_ADC0_NAME);
|
|
if (adc0 == RT_NULL)
|
|
{
|
|
misc_debug("Misc err: Can't find device: %s!\n", RT_ADC0_NAME);
|
|
break;
|
|
}
|
|
misc_debug("Misc: Find device %s\n", RT_ADC0_NAME);
|
|
|
|
return RT_EOK;
|
|
} while (0);
|
|
|
|
misc_debug("Misc err: Init failed!\n");
|
|
return -RT_ERROR;
|
|
}
|
|
|
|
/***************************************************************************//**
|
|
* @brief
|
|
* Convert ADC result to degree celsius.
|
|
*
|
|
* @details
|
|
*
|
|
* @note
|
|
* See section 2.3.4 in the reference manual for details on this calculatoin
|
|
*
|
|
* @param adcResult
|
|
* Raw value from ADC to be converted to celsius
|
|
*
|
|
* @return
|
|
* The temperature value (signed integer) in degrees celsius times 100
|
|
*
|
|
******************************************************************************/
|
|
rt_int32_t efm32_misc_getCelsius(rt_uint32_t adcResult)
|
|
{
|
|
/* Factory calibration temperature from device information page. */
|
|
rt_int32_t cal_temp = ((DEVINFO->CAL & _DEVINFO_CAL_TEMP_MASK) \
|
|
>> _DEVINFO_CAL_TEMP_SHIFT) * 100;
|
|
|
|
/* Factory calibration value from device information page. */
|
|
rt_int32_t cal_value = ((DEVINFO->ADC0CAL2 & _DEVINFO_ADC0CAL2_TEMP1V25_MASK) \
|
|
>> _DEVINFO_ADC0CAL2_TEMP1V25_SHIFT) * 10000;
|
|
|
|
/* Temperature gradient (from datasheet) in (ADC unit / degree celsius * 100) */
|
|
rt_int32_t t_grad = -385;
|
|
|
|
return (cal_temp - (cal_value - (rt_int32_t)adcResult * 10000) / t_grad);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
* Export to FINSH
|
|
******************************************************************************/
|
|
#ifdef RT_USING_FINSH
|
|
#include <finsh.h>
|
|
|
|
void list_temp(void)
|
|
{
|
|
rt_int32_t temp = rt_hw_get_temp();
|
|
|
|
rt_kprintf("Temperature is %2d.%02d C\n", temp / 100, temp % 100);
|
|
}
|
|
FINSH_FUNCTION_EXPORT(list_temp, list current temperature value.)
|
|
|
|
void list_vdd(void)
|
|
{
|
|
rt_uint32_t vdd = rt_hw_get_vdd();
|
|
|
|
rt_kprintf("VDD is %1d.%02d V\n", vdd / 100, vdd % 100);
|
|
}
|
|
FINSH_FUNCTION_EXPORT(list_vdd, list current VDD value.)
|
|
|
|
#endif /* RT_USING_FINSH */
|
|
|
|
#endif /* defined(RT_USING_MISC) */
|
|
/***************************************************************************//**
|
|
* @}
|
|
******************************************************************************/
|