参考STM32F7实现ADC采集(软件触发+DMA传输)解决了采样结果不实时更新的问题和STM32F7普通定时器的使用(定时+中断+PWM),实现了定时器加DMA的等周期采集。
adc.c
:
#include "adc.h"
#include "delay.h"
ADC_HandleTypeDef ADC1_Handler;//ADC句柄
DMA_HandleTypeDef ADC1DMA_Handler;
ADC_ChannelConfTypeDef ADC1_ChanConf;
TIM_HandleTypeDef TIM2_Handler;
TIM_OC_InitTypeDef TIM2_CH2Handler;
uint16_t buffer[128];
static void MX_TIM2_Init(void)
{
__HAL_RCC_TIM2_CLK_ENABLE();
HAL_NVIC_SetPriority(TIM2_IRQn, 1, 3);
HAL_NVIC_EnableIRQ(TIM2_IRQn);
TIM2_Handler.Instance = TIM2;
TIM2_Handler.Init.Prescaler = 10800;
TIM2_Handler.Init.CounterMode = TIM_COUNTERMODE_UP;
TIM2_Handler.Init.Period = 20000;
TIM2_Handler.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_PWM_Init(&TIM2_Handler);
TIM2_CH2Handler.OCMode = TIM_OCMODE_PWM1;
TIM2_CH2Handler.Pulse = 10000;
TIM2_CH2Handler.OCPolarity = TIM_OCPOLARITY_HIGH;
TIM2_CH2Handler.OCFastMode = TIM_OCFAST_DISABLE;
HAL_TIM_PWM_ConfigChannel(&TIM2_Handler, &TIM2_CH2Handler, TIM_CHANNEL_2) ;
__HAL_TIM_ENABLE_IT(&TIM2_Handler, TIM_IT_UPDATE);
TIM_CCxChannelCmd(TIM2_Handler.Instance, TIM_CHANNEL_2, TIM_CCx_ENABLE);
__HAL_TIM_ENABLE(&TIM2_Handler);
}
void TIM2_IRQHandler(void)
{
HAL_TIM_IRQHandler(&TIM2_Handler);
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
if (htim == (&TIM2_Handler))
{
printf("timer irq\r\n");
}
}
void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_TIM2_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
GPIO_InitStruct.Alternate = GPIO_AF1_TIM2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}
//初始化ADC
//ch: ADC_channels
//通道值 0~16取值范围为:ADC_CHANNEL_0~ADC_CHANNEL_16
void MY_ADC_Init(void)
{
__HAL_RCC_DMA2_CLK_ENABLE();
HAL_NVIC_SetPriority(DMA2_Stream0_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream0_IRQn);
ADC1DMA_Handler.Instance = DMA2_Stream0;
ADC1DMA_Handler.Init.Channel = DMA_CHANNEL_0;
ADC1DMA_Handler.Init.Direction = DMA_PERIPH_TO_MEMORY;
ADC1DMA_Handler.Init.PeriphInc = DMA_PINC_DISABLE; //外设非增量模式
ADC1DMA_Handler.Init.MemInc = DMA_MINC_ENABLE; //存储器增量模式
ADC1DMA_Handler.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据长度:16位
ADC1DMA_Handler.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据长度:16位
ADC1DMA_Handler.Init.Mode = DMA_CIRCULAR; //传输一次就结束
ADC1DMA_Handler.Init.Priority = DMA_PRIORITY_LOW; //中等优先级
ADC1DMA_Handler.Init.FIFOMode = DMA_FIFOMODE_DISABLE; /* 禁止FIFO*/
HAL_DMA_Init(&ADC1DMA_Handler);
__HAL_LINKDMA(&ADC1_Handler, DMA_Handle, ADC1DMA_Handler); //将DMA与ADC联系起来
ADC1_Handler.Instance = ADC1;
ADC1_Handler.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; //4分频,ADCCLK=PCLK2/4=108/4=27MHZ
ADC1_Handler.Init.Resolution = ADC_RESOLUTION_12B; //12位模式
ADC1_Handler.Init.ScanConvMode = ENABLE; //非扫描模式
ADC1_Handler.Init.ContinuousConvMode = DISABLE; //关闭连续转换
ADC1_Handler.Init.DiscontinuousConvMode = DISABLE; //禁止不连续采样模式
ADC1_Handler.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; //使用软件触发
ADC1_Handler.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T2_CC2; //软件触发
ADC1_Handler.Init.DataAlign = ADC_DATAALIGN_RIGHT; //右对齐
ADC1_Handler.Init.NbrOfConversion = 2; //1个转换在规则序列中 也就是只转换规则序列1
ADC1_Handler.Init.DMAContinuousRequests = ENABLE; //关闭DMA请求
ADC1_Handler.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
HAL_ADC_Init(&ADC1_Handler);
ADC1_ChanConf.Channel = ADC_CHANNEL_5; //通道
ADC1_ChanConf.Rank = 1; //序列1
ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
ADC1_ChanConf.Offset = 0;
HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置
ADC1_ChanConf.Channel = ADC_CHANNEL_6; //通道
ADC1_ChanConf.Rank = 2; //序列2
ADC1_ChanConf.SamplingTime = ADC_SAMPLETIME_480CYCLES; //采样时间
ADC1_ChanConf.Offset = 0;
HAL_ADC_ConfigChannel(&ADC1_Handler, &ADC1_ChanConf); //通道配置
MX_TIM2_Init();
HAL_ADC_Start_DMA(&ADC1_Handler, (uint32_t *)buffer, 128);
}
//ADC底层驱动,引脚配置,时钟使能
//此函数会被HAL_ADC_Init()调用
//hadc:ADC句柄
void HAL_ADC_MspInit(ADC_HandleTypeDef *hadc)
{
GPIO_InitTypeDef GPIO_Initure;
__HAL_RCC_ADC1_CLK_ENABLE(); //使能ADC1时钟
__HAL_RCC_GPIOA_CLK_ENABLE(); //开启GPIOA时钟
GPIO_Initure.Pin = GPIO_PIN_5 | GPIO_PIN_6; //PA5
GPIO_Initure.Mode = GPIO_MODE_ANALOG; //模拟
GPIO_Initure.Pull = GPIO_NOPULL; //不带上下拉
HAL_GPIO_Init(GPIOA, &GPIO_Initure);
}
void DMA2_Stream0_IRQHandler(void)
{
HAL_DMA_IRQHandler(&ADC1DMA_Handler);
}
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef *hadc)
{
printf("DMA transfer complete\r\n");
}
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
{
printf("DMA Half transfer complete\r\n");
}
void HAL_ADC_ErrorCallback(ADC_HandleTypeDef *hadc)
{
printf("DMA transfer error\r\n");
}
main.c:
#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "adc.h"
extern uint16_t buffer[128];
void show()
{
int i;
printf("\r\ndata:");
for (i = 0; i < 128; i++)
{
if (i % 16 == 0) printf("\r\n");
printf("%6d", buffer[i]);
//buffer[i]=0;
}
printf("\r\n");
}
int main(void)
{
//Cache_Enable(); //打开L1-Cache
HAL_Init(); //初始化HAL库
Stm32_Clock_Init(432, 8, 2, 9); //设置时钟,216Mhz
delay_init(216); //延时初始化
uart_init(115200); //串口初始化
printf("\r\n\r\n\r\n---------------------------------------\r\nstart\r\n");
MY_ADC_Init(); //初始化ADC1通道5
while (1)
{
show();
//printf("cnt:%d\r\n",TIM2->CNT);
delay_ms(1000);
}
}
因为定时器是2s采集一次,主函数是1s打印一次,所以显示结果如下: