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162 lines
5.3 KiB
C
162 lines
5.3 KiB
C
/**
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******************************************************************************
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* @file platform_adc.c
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* @author William Xu
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* @version V1.0.0
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* @date 05-May-2014
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* @brief This file provide ADC driver functions.
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******************************************************************************
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* UNPUBLISHED PROPRIETARY SOURCE CODE
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* Copyright (c) 2016 MXCHIP Inc.
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*
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* The contents of this file may not be disclosed to third parties, copied or
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* duplicated in any form, in whole or in part, without the prior written
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* permission of MXCHIP Corporation.
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******************************************************************************
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*/
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#include "platform.h"
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#include "platform_peripheral.h"
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#include "platform_logging.h"
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/******************************************************
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* Constants
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******************************************************/
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/******************************************************
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* Enumerations
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******************************************************/
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/******************************************************
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* Type Definitions
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******************************************************/
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/******************************************************
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* Structures
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******************************************************/
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/******************************************************
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* Variables Definitions
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******************************************************/
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static const uint16_t adc_sampling_cycle[] =
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{
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[ADC_SampleTime_3Cycles ] = 3,
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[ADC_SampleTime_15Cycles ] = 15,
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[ADC_SampleTime_28Cycles ] = 28,
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[ADC_SampleTime_56Cycles ] = 56,
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[ADC_SampleTime_84Cycles ] = 84,
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[ADC_SampleTime_112Cycles] = 112,
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[ADC_SampleTime_144Cycles] = 144,
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[ADC_SampleTime_480Cycles] = 480,
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};
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/******************************************************
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* Function Declarations
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******************************************************/
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/******************************************************
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* Function Definitions
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******************************************************/
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OSStatus platform_adc_init( const platform_adc_t* adc, uint32_t sample_cycle )
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{
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GPIO_InitTypeDef gpio_init_structure;
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ADC_InitTypeDef adc_init_structure;
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ADC_CommonInitTypeDef adc_common_init_structure;
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uint8_t a;
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OSStatus err = kNoErr;
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platform_mcu_powersave_disable();
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require_action_quiet( adc != NULL, exit, err = kParamErr);
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/* Enable peripheral clock for this port */
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err = platform_gpio_enable_clock( adc->pin );
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require_noerr(err, exit);
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/* Initialize the associated GPIO */
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gpio_init_structure.GPIO_Pin = (uint32_t)( 1 << adc->pin->pin_number );;
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gpio_init_structure.GPIO_Speed = (GPIOSpeed_TypeDef) 0;
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gpio_init_structure.GPIO_Mode = GPIO_Mode_AN;
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gpio_init_structure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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gpio_init_structure.GPIO_OType = GPIO_OType_OD;
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GPIO_Init( adc->pin->port, &gpio_init_structure );
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RCC_APB2PeriphClockCmd( adc->adc_peripheral_clock, ENABLE );
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/* Initialize the ADC */
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ADC_StructInit( &adc_init_structure );
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adc_init_structure.ADC_Resolution = ADC_Resolution_12b;
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adc_init_structure.ADC_ScanConvMode = DISABLE;
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adc_init_structure.ADC_ContinuousConvMode = DISABLE;
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adc_init_structure.ADC_ExternalTrigConv = ADC_ExternalTrigConvEdge_None;
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adc_init_structure.ADC_DataAlign = ADC_DataAlign_Right;
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adc_init_structure.ADC_NbrOfConversion = 1;
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ADC_Init( adc->port, &adc_init_structure );
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ADC_CommonStructInit( &adc_common_init_structure );
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adc_common_init_structure.ADC_Mode = ADC_Mode_Independent;
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adc_common_init_structure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
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adc_common_init_structure.ADC_Prescaler = ADC_Prescaler_Div2;
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adc_common_init_structure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
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ADC_CommonInit( &adc_common_init_structure );
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ADC_Cmd( adc->port, ENABLE );
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/* Find the closest supported sampling time by the MCU */
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for ( a = 0; ( a < sizeof( adc_sampling_cycle ) / sizeof(uint16_t) ) && adc_sampling_cycle[a] < sample_cycle; a++ )
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{
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}
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/* Initialize the ADC channel */
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ADC_RegularChannelConfig( adc->port, adc->channel, adc->rank, a );
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exit:
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platform_mcu_powersave_enable();
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return err;
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}
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OSStatus platform_adc_take_sample( const platform_adc_t* adc, uint16_t* output )
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{
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OSStatus err = kNoErr;
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platform_mcu_powersave_disable();
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require_action_quiet( adc != NULL, exit, err = kParamErr);
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/* Start conversion */
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ADC_SoftwareStartConv( adc->port );
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/* Wait until end of conversion */
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while ( ADC_GetFlagStatus( adc->port, ADC_FLAG_EOC ) == RESET )
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{
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}
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/* Read ADC conversion result */
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*output = ADC_GetConversionValue( adc->port );
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exit:
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platform_mcu_powersave_enable();
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return err;
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}
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OSStatus platform_adc_take_sample_stream( const platform_adc_t* adc, void* buffer, uint16_t buffer_length )
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{
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UNUSED_PARAMETER(adc);
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UNUSED_PARAMETER(buffer);
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UNUSED_PARAMETER(buffer_length);
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platform_log("unimplemented");
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return kNotPreparedErr;
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}
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OSStatus platform_adc_deinit( const platform_adc_t* adc )
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{
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UNUSED_PARAMETER(adc);
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platform_log("unimplemented");
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return kNotPreparedErr;
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}
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