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git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@1777 ebee16cc-31ac-478f-84a7-5cbb03baadba
213 lines
6.9 KiB
C
213 lines
6.9 KiB
C
/**
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******************************************************************************
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* @addtogroup PIOS PIOS Core hardware abstraction layer
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* @{
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* @addtogroup PIOS_ADC ADC Functions
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* @brief STM32 ADC PIOS interface
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* @{
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*
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* @file pios_adc.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* Parts by Thorsten Klose (tk@midibox.org) (tk@midibox.org)
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* @brief Analog to Digital converstion routines
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* @see The GNU Public License (GPL) Version 3
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Project Includes */
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#include "pios.h"
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#if defined(PIOS_INCLUDE_ADC)
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/* Local Variables */
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static GPIO_TypeDef *ADC_GPIO_PORT[PIOS_ADC_NUM_PINS] = PIOS_ADC_PORTS;
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static const uint32_t ADC_GPIO_PIN[PIOS_ADC_NUM_PINS] = PIOS_ADC_PINS;
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static const uint32_t ADC_CHANNEL[PIOS_ADC_NUM_PINS] = PIOS_ADC_CHANNELS;
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static ADC_TypeDef *ADC_MAPPING[PIOS_ADC_NUM_PINS] = PIOS_ADC_MAPPING;
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static const uint32_t ADC_CHANNEL_MAPPING[PIOS_ADC_NUM_PINS] = PIOS_ADC_CHANNEL_MAPPING;
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/* The following two arrays are word aligned, so that DMA can transfer two hwords at once */
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static uint16_t adc_conversion_values[PIOS_ADC_NUM_CHANNELS] __attribute__ ((aligned(4)));
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//static uint16_t adc_conversion_values_sum[PIOS_ADC_NUM_CHANNELS]; __attribute__((aligned(4)));
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static uint16_t adc_pin_values[PIOS_ADC_NUM_CHANNELS];
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/**
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* Initialise the ADC Peripheral
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*/
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void PIOS_ADC_Init(void)
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{
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int32_t i;
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/* Clear arrays and variables */
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for (i = 0; i < PIOS_ADC_NUM_CHANNELS; ++i) {
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adc_conversion_values[i] = 0;
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}
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for (i = 0; i < PIOS_ADC_NUM_CHANNELS; ++i) {
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adc_pin_values[i] = 0;
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}
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/* Setup analog pins */
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_StructInit(&GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
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/* Enable each ADC pin in the array */
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for (i = 0; i < PIOS_ADC_NUM_PINS; i++) {
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GPIO_InitStructure.GPIO_Pin = ADC_GPIO_PIN[i];
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GPIO_Init(ADC_GPIO_PORT[i], &GPIO_InitStructure);
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}
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/* Enable ADC clocks */
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PIOS_ADC_CLOCK_FUNCTION;
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/* Map channels to conversion slots depending on the channel selection mask */
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for (i = 0; i < PIOS_ADC_NUM_PINS; i++) {
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ADC_RegularChannelConfig(ADC_MAPPING[i], ADC_CHANNEL[i], ADC_CHANNEL_MAPPING[i], PIOS_ADC_SAMPLE_TIME);
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}
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#if (PIOS_ADC_USE_TEMP_SENSOR)
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ADC_TempSensorVrefintCmd(ENABLE);
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ADC_RegularChannelConfig(PIOS_ADC_TEMP_SENSOR_ADC, ADC_Channel_14, PIOS_ADC_TEMP_SENSOR_ADC_CHANNEL, PIOS_ADC_SAMPLE_TIME);
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#endif
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/* Configure ADCs */
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ADC_InitTypeDef ADC_InitStructure;
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ADC_StructInit(&ADC_InitStructure);
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ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;
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ADC_InitStructure.ADC_ScanConvMode = ENABLE;
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ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
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ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
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ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
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ADC_InitStructure.ADC_NbrOfChannel = ((PIOS_ADC_NUM_CHANNELS + 1) >> 1);
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ADC_Init(ADC1, &ADC_InitStructure);
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#if (PIOS_ADC_USE_ADC2)
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ADC_Init(ADC2, &ADC_InitStructure);
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/* Enable ADC2 external trigger conversion (to synch with ADC1) */
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ADC_ExternalTrigConvCmd(ADC2, ENABLE);
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#endif
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//RCC_ADCCLKConfig(PIOS_ADC_ADCCLK);
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/* Enable ADC1->DMA request */
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ADC_DMACmd(ADC1, ENABLE);
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/* ADC1 calibration */
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ADC_Cmd(ADC1, ENABLE);
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ADC_ResetCalibration(ADC1);
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while (ADC_GetResetCalibrationStatus(ADC1)) ;
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ADC_StartCalibration(ADC1);
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while (ADC_GetCalibrationStatus(ADC1)) ;
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#if (PIOS_ADC_USE_ADC2)
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/* ADC2 calibration */
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ADC_Cmd(ADC2, ENABLE);
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ADC_ResetCalibration(ADC2);
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while (ADC_GetResetCalibrationStatus(ADC2)) ;
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ADC_StartCalibration(ADC2);
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while (ADC_GetCalibrationStatus(ADC2)) ;
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#endif
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/* Enable DMA1 clock */
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
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/* Configure DMA1 channel 1 to fetch data from ADC result register */
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DMA_InitTypeDef DMA_InitStructure;
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DMA_StructInit(&DMA_InitStructure);
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DMA_DeInit(DMA1_Channel1);
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DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & ADC1->DR;
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DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) & adc_conversion_values;
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DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
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DMA_InitStructure.DMA_BufferSize = ((PIOS_ADC_NUM_CHANNELS + 1) >> 1); /* Number of conversions depends on number of used channels */
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DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
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DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
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DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
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DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
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DMA_Init(DMA1_Channel1, &DMA_InitStructure);
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DMA_Cmd(DMA1_Channel1, ENABLE);
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/* Trigger interrupt when all conversion values have been fetched */
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DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
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/* Configure and enable DMA interrupt */
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = PIOS_ADC_IRQ_PRIO;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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/* Finally start initial conversion */
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ADC_SoftwareStartConvCmd(ADC1, ENABLE);
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}
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/**
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* Returns value of an ADC Pin
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* \param[in] pin number
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* \return ADC pin value - resolution depends on the selected oversampling rate
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* \return -1 if pin doesn't exist
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*/
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int32_t PIOS_ADC_PinGet(uint32_t pin)
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{
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/* Check if pin exists */
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if (pin >= PIOS_ADC_NUM_CHANNELS) {
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return -1;
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}
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/* Return last conversion result */
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return adc_pin_values[pin];
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}
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/**
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* DMA channel interrupt is triggered when all ADC channels have been converted
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* \note shouldn't be called directly from application
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*/
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void DMA1_Channel1_IRQHandler(void)
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{
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int32_t i;
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uint16_t *src_ptr;
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/* Clear the pending flag(s) */
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DMA_ClearFlag(DMA1_FLAG_TC1 | DMA1_FLAG_TE1 | DMA1_FLAG_HT1 | DMA1_FLAG_GL1);
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src_ptr = (uint16_t *) adc_conversion_values;
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/* Copy conversion values to adc_pin_values */
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for (i = 0; i < PIOS_ADC_NUM_CHANNELS; ++i) {
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/* Takeover new value */
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adc_pin_values[i] = *src_ptr;
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++src_ptr;
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}
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/* Request next conversion */
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ADC_SoftwareStartConvCmd(ADC1, ENABLE);
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}
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#endif
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/**
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* @}
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* @}
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*/
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