ef6bbc34fa
1. Add ENC28J60 Ethernet controller driver 2. Add lwIP support (Please read "Readme.txt") 3. Add simple Http server demo application 4. Modify USART device write function to avoid sleep in ISR 5. Fix a bug in USART driver when using compiler optimization 6. Modify to make use the start-up code in libraries 7. Change the default build option for squeezing the executable file size 8. Modify source code alignment git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1622 bbd45198-f89e-11dd-88c7-29a3b14d5316
191 lines
6.2 KiB
C
191 lines
6.2 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
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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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* 2011-02-22 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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#ifdef RT_MISC_DEBUG
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#define misc_debug(format,args...) rt_kprintf(format, ##args)
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#else
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#define misc_debug(format,args...)
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#endif
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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.
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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 = 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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misc_debug("Batt err: Can't find device: %s!\n", RT_ADC0_NAME);
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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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misc_debug("Misc err: Init failed!\n");
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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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