gd32f103 adc通道说明

/*!
\file main.c
\brief ADC Temperature Vrefint demo
*/

/*
Copyright © 2017 GigaDevice
2017-06-23, V1.0.0, demo for GD32F30x
*/

#include “gd32f30x.h”
#include “gd32f303c_eval.h”
#include “systick.h”
#include <stdio.h>
//定义13通道
#define BOARD_ADC_CHANEL ADC_CHANNEL_13
//c组 gpio

#define ADC_GPIO_PORT GPIOC
//第三个gpio
#define ADC_GPIO_PIN GPIO_PIN_3
//pos机 pa1 1.29v pa2 1.46v pa3 3.3v
//刚好对比代码执行正常
//IN0 :PA0 IN1: PA1 IN2 :PA2 IN3:PA3
//5组数值
uint16_t adc_value[5];
//float temperature;
//校验值 为 浮点数
float vref_value;

void rcu_config(void);
void gpio_config(void);
void dma_config(void);
void adc_config(void);

/*!
\brief main function
\param[in] none
\param[out] none
\retval none
*/
int main(void)
{

int i;
/* system clocks configuration */
rcu_config();
/* configure systick */
systick_config();  
/*GPIO configuration*/
  gpio_config();
/* ADC configuration */
adc_config();
/* USART configuration */
//串口1 传输
gd_eval_com_init(EVAL_COM1);
while(1){
	dma_config();
   //软件触发启用
	adc_software_trigger_enable(ADC0, ADC_REGULAR_CHANNEL);     //规则通道
/* delay a time in milliseconds */
delay_1ms(2000);
  
 /* value convert  */
 //  temperature = (1.43 - ADC_IDATA0(ADC0)*3.3/4096) * 1000 / 4.3 + 25;
		for ( i=0;i<5;i++){
		     vref_value = adc_value[i] * 3.3 / 4096;
			   printf("%5.3fV ", vref_value);
       
		}
		printf("\r\n");

  
 /* value print */
 //  printf(" the temperature data is %2.0f degrees Celsius\r\n", temperature);

}

}

/*!
\brief configure the different system clocks
\param[in] none
\param[out] none
\retval none
/
void rcu_config(void)
{
/ enable GPIOA clock */
//a c 组 时钟开启
rcu_periph_clock_enable(RCU_GPIOC);
rcu_periph_clock_enable(RCU_GPIOA);

/* enable ADC clock */
//adc时钟开启
rcu_periph_clock_enable(RCU_ADC0);
/* config ADC clock */
//时钟分频
rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV6);
  /* enable DMA0 clock */
  //dma时钟开启
rcu_periph_clock_enable(RCU_DMA0);

}

/*!
\brief configure the ADC peripheral
\param[in] none
\param[out] none
\retval none
*/

void gpio_config(void)
{
/* config the GPIO as analog mode */
//gpio 设为模拟量输入模式
gpio_init(ADC_GPIO_PORT, GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, ADC_GPIO_PIN);
gpio_init(GPIOA,GPIO_MODE_AIN,GPIO_OSPEED_50MHZ,GPIO_PIN_0);
gpio_init(GPIOA,GPIO_MODE_AIN,GPIO_OSPEED_50MHZ,GPIO_PIN_1);
gpio_init(GPIOA,GPIO_MODE_AIN,GPIO_OSPEED_50MHZ,GPIO_PIN_2);
gpio_init(GPIOA,GPIO_MODE_AIN,GPIO_OSPEED_50MHZ,GPIO_PIN_3);
}

void dma_config(void)
{
/* ADC_DMA_channel configuration */
dma_parameter_struct dma_data_parameter;

/* ADC DMA_channel configuration */
dma_deinit(DMA0, DMA_CH0);

/* initialize DMA single data mode */
dma_data_parameter.periph_addr  = (uint32_t)(&ADC_RDATA(ADC0));
dma_data_parameter.periph_inc   = DMA_PERIPH_INCREASE_DISABLE;
dma_data_parameter.memory_addr  = (uint32_t)(&adc_value);
dma_data_parameter.memory_inc   = DMA_MEMORY_INCREASE_ENABLE;
dma_data_parameter.periph_width = DMA_PERIPHERAL_WIDTH_16BIT;
dma_data_parameter.memory_width = DMA_MEMORY_WIDTH_16BIT;  
dma_data_parameter.direction    = DMA_PERIPHERAL_TO_MEMORY;
//5组数值
dma_data_parameter.number       = 5;
dma_data_parameter.priority     = DMA_PRIORITY_HIGH;
dma_init(DMA0, DMA_CH0, &dma_data_parameter);
dma_circulation_disable(DMA0, DMA_CH0);
	dma_memory_to_memory_disable(DMA0, DMA_CH0);
		/* enable DMA channel */
dma_channel_enable(DMA0, DMA_CH0);

}
void adc_config(void)
{
/* reset ADC /
adc_deinit(ADC0); //复用ADC外设
/ ADC mode config /
adc_mode_config(ADC_MODE_FREE); //配置ADC同步模式
/ ADC contineous function enable /
adc_special_function_config(ADC0, ADC_CONTINUOUS_MODE, DISABLE); // ADC连续模式使能
/ ADC scan mode disable /
adc_special_function_config(ADC0, ADC_SCAN_MODE, ENABLE);
/ ADC data alignment config /
adc_data_alignment_config(ADC0, ADC_DATAALIGN_RIGHT); //ADC数据右对齐配置
/ ADC channel length config */
adc_channel_length_config(ADC0, ADC_REGULAR_CHANNEL, 5); //ADC通道长度配置 w五路通道

/* ADC regular channel config */       //规则通道配置
//每个adc端口 设置扫描模式
adc_regular_channel_config(ADC0, 4,  ADC_CHANNEL_0 , ADC_SAMPLETIME_55POINT5);//采样时间；55.5个ADC工作周期
  adc_regular_channel_config(ADC0, 3,  ADC_CHANNEL_1 , ADC_SAMPLETIME_55POINT5);
  adc_regular_channel_config(ADC0, 2,  ADC_CHANNEL_2 , ADC_SAMPLETIME_55POINT5);
  adc_regular_channel_config(ADC0, 1,  ADC_CHANNEL_3 , ADC_SAMPLETIME_55POINT5);
  adc_regular_channel_config(ADC0, 0,  BOARD_ADC_CHANEL, ADC_SAMPLETIME_55POINT5);
/* ADC trigger config */
adc_external_trigger_source_config(ADC0, ADC_REGULAR_CHANNEL, ADC0_1_2_EXTTRIG_REGULAR_NONE);//触发条件 none是不使用外部触发，只使用软件触发
adc_external_trigger_config(ADC0, ADC_REGULAR_CHANNEL, ENABLE);   //配置adc外部触发

/* enable ADC interface */
adc_enable(ADC0);
delay_1ms(1);
/* ADC calibration and reset calibration */
adc_calibration_enable(ADC0);
	/* ADC DMA function enable */
adc_dma_mode_enable(ADC0);

}

/* retarget the C library printf function to the USART */

//将数据 发送到串口显示
int fputc(int ch, FILE *f)
{
usart_data_transmit(EVAL_COM1, (uint8_t) ch);
while (RESET == usart_flag_get(EVAL_COM1,USART_FLAG_TBE));
return ch;
}