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
//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;
}