/**
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* @file adc.c
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* @author Ethan.Tao (tzj0429@163.com)
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* @brief
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* @version 0.1
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* @date 2020-12-13
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*
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* @copyright Copyright (c)
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*
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*/
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#include "adc.h"
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#include "gpio.h"
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#include "gd32e23x_adc.h"
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static __IO uint16_t ad_value[2];
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static void ADC_GPIOCfg(void)
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{
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/* enable DMA clock */
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rcu_periph_clock_enable(RCU_DMA);
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/* enable ADC clock */
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rcu_periph_clock_enable(RCU_ADC);
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gpio_mode_set(CURRENT_AI_PORT, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, CURRENT_AI_PIN);
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gpio_mode_set(VOLTAGE_AI_PORT, GPIO_MODE_ANALOG, GPIO_PUPD_NONE, VOLTAGE_AI_PIN);
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}
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static void ADC_DMAconfig(void)
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{
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dma_parameter_struct dma_init_struct;
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/* initialize DMA channel0 */
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dma_deinit(DMA_CH0);
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dma_init_struct.direction = DMA_PERIPHERAL_TO_MEMORY;
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dma_init_struct.memory_addr = (uint32_t)ad_value;
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dma_init_struct.memory_inc = DMA_MEMORY_INCREASE_ENABLE;
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dma_init_struct.memory_width = DMA_MEMORY_WIDTH_16BIT;
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dma_init_struct.number = 2;
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dma_init_struct.periph_addr = (uint32_t) & (ADC_RDATA);
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dma_init_struct.periph_inc = DMA_PERIPH_INCREASE_DISABLE;
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dma_init_struct.periph_width = DMA_PERIPHERAL_WIDTH_16BIT;
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dma_init_struct.priority = DMA_PRIORITY_ULTRA_HIGH;
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dma_init(DMA_CH0, &dma_init_struct);
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/* configure DMA mode */
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dma_circulation_enable(DMA_CH0);
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dma_memory_to_memory_disable(DMA_CH0);
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/* enable DMA channel0 */
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dma_channel_enable(DMA_CH0);
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}
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extern void ADC_Init(void)
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{
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ADC_GPIOCfg();
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ADC_DMAconfig();
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/* ADC channel length config */
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adc_channel_length_config(ADC_REGULAR_CHANNEL, 2); //¹æÔò×é ¹²2¸öͨµÀ
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/* ADC regular channel config */
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adc_regular_channel_config(0, ADC_CHANNEL_1, ADC_SAMPLETIME_7POINT5);
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adc_regular_channel_config(1, ADC_CHANNEL_2, ADC_SAMPLETIME_7POINT5);
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/* ADC external trigger enable */
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adc_external_trigger_config(ADC_REGULAR_CHANNEL, ENABLE);
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/* ADC external trigger source config */
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adc_external_trigger_source_config(ADC_REGULAR_CHANNEL, ADC_EXTTRIG_REGULAR_T0_CH2);
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/* ADC data alignment config */
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adc_data_alignment_config(ADC_DATAALIGN_RIGHT);
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/* enable ADC interface */
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adc_enable();
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/* ADC calibration and reset calibration */
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adc_calibration_enable();
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/* ADC DMA function enable */
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adc_dma_mode_enable();
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}
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extern uint16_t ADC_GetChannleValue(uint8_t ch)
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{
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while (!dma_flag_get(DMA_CH0, DMA_FLAG_FTF))
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;
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/* clear channel0 transfer complete flag */
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dma_flag_clear(DMA_CH0, DMA_FLAG_FTF);
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return ad_value[ch];
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}
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