Learning link:[HAL library detailed explanation] STM32 ADC HAL library usage_bilibili_bilibili
Table of contents
1.1 Single-channel acquisition software configuration
1.3 Single channel acquisition main code
Three, Tatsudo Kashu
1. Concept
1. Introduction to ADC
12-bit ADC is a successive approximation analog-to-digital converter. It has up to 18 channels and can measure 16 external and 2 internal signal sources. A/D conversion of each channel can be performed in single, continuous, scan or discontinuous modes. The results of the ADC can be stored in a 16-bit data register either left-aligned or right-aligned.
2. Main features of ADC
12-bit resolution
● Interrupts at end of conversion, end of injected conversion and analog watchdog events
● Single and continuous conversions Mode
● Auto scan mode from channel 0 to channel n
● Self-calibration
● With embedded data consistency Data alignment
● Sampling intervals can be programmed individually per channel
● External triggering options for both rule conversion and injection conversion
● Discontinuity Mode
● Dual mode (devices with 2 or more ADCs)
● ADC conversion time:
─ STM32F103xx enhanced Product: 1μs when the clock is 56MHz (1.17μs when the clock is 72MHz)
● ADC power supply requirement: 2.4V to 3.6V
● ADC input range: VREF - ≤ VIN ≤ VREF+
● A DMA request is generated during regular channel conversion.
2. ADC mode
1. Query (blocking) mode
1.1 Single-channel acquisition software configuration
1.1.1 Just select the interface
1.1.2 Open the serial port for printing data
1.2 Query mode steps
1.3 Main functions of query mode
①HAL_ADC_Start(&hadc1);
Start ADC and ADC conversion
②HAL_ADC_Stop(&hadc1);
Turn off ADC
③HAL_ADC_PollForConversion(&hadc1, 100);//Blocking to determine whether the conversion is completed
Polling to check whether the ADC conversion is completed, a status will be returned when the conversion is completed
④HAL_ADC_PollForEvent();
Wait for the specified ADC event to occur and return a status, which can be used to wait for a specific event to occur and then execute related code.
//ADC_PollForEvent`函数用于轮询检查ADC事件是否发生。
// 假设使用了ADC1进行操作
ADC_HandleTypeDef hadc1; // 声明一个 ADC_HandleTypeDef 结构体变量
// 在适当的地方对ADC1进行初始化配置
// 等待ADC转换完成的函数
void wait_for_adc_event() {
// 在这里进行ADC转换启动等操作（例如设置通道、采样时间等）
// 轮询检查特定的ADC事件，例如转换完成事件
while (HAL_ADC_PollForEvent(&hadc1, ADC_EOC_SINGLE_CONV) != HAL_OK) {
// 可以添加一些等待的代码，或者执行其他操作
}
// 如果到达这里，表示已经检测到了特定的ADC事件（例如转换完成事件）
// 可以继续执行其他代码，例如获取ADC转换值等
}
//使用ADC_PollForEvent函数等待特定的 ADC 事件（单次转换完成事件 ADC_EOC_SINGLE_CONV）
//然后在事件发生后执行相应的操作。在实际应用中，根据需求可能需要进行相应的配置和处理。1.4 Single channel acquisition main code
#include <stdio.h>
#include <string.h>
//ADC采集值获取
int16_t get_adc_value(void)
{
HAL_ADC_Start(&hadc1);
HAL_ADC_PollForConversion(&hadc1, 100);//阻塞判断是否转换完成
if(HAL_IS_BIT_SET(HAL_ADC_GetState(&hadc1),HAL_ADC_STATE_REG_EOC))
{
return HAL_ADC_GetValue(&hadc1);
}
return -1;
}
//main函数主循环代码如下
/* USER CODE BEGIN WHILE */
int16_t value=0;
char buff[30];
while (1)
{
value=get_adc_value();
if(value==-1)
{
HAL_UART_Transmit(&huart2, (uint8_t*)"GetADCValue Faild !! \r\n", 25, 50);
}
else
{
sprintf(buff, "value:%d \r\n",value);
HAL_UART_Transmit(&huart2, (uint8_t*)buff, strlen(buff), 50);
}
HAL_Delay(1000);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}1.5 Multi-channel acquisition
2. Interrupt mode
3. DMA mode
3. Multi-channel acquisition
2.1 Software configuration
2.2 Main code
while (1)
{
get_adc_value(DMARes);
sprintf(buff, "value:%d,%d,%d \r\n",DMARes[0],DMARes[1],DMARes[2]);
HAL_UART_Transmit(&huart2, (uint8_t*)buff, strlen(buff), 50);
HAL_Delay(500);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
void get_adc_value(int* DMARes)
{
HAL_ADC_Start(&hadc1);
HAL_ADC_PollForConversion(&hadc1, 100);//阻塞判断是否转换完成
DMARes[0]= HAL_ADC_GetValue(&hadc1);
HAL_ADC_PollForConversion(&hadc1, 100);//阻塞判断是否转换完成
DMARes[1]= HAL_ADC_GetValue(&hadc1);
HAL_ADC_PollForConversion(&hadc1, 100);//阻塞判断是否转换完成
DMARes[2]= HAL_ADC_GetValue(&hadc1);
HAL_ADC_Stop(&hadc1);
}