帮我写一个STM32F103C8T6的单通道ADC采样代码,要求用定时器中断实现1KHz采样率,采样结果保存为2字节整型,并通过串口输出
时间: 2024-03-09 11:45:58 浏览: 18
好的,请问使用哪种编程语言?我这里提供C语言的实现方式。
首先,需要初始化GPIO口和串口。假设我们使用PA0口作为ADC输入,USART1口作为串口输出。
```c
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
// 初始化GPIO口
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 初始化串口
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
```
接着,需要初始化ADC和定时器。假设我们使用TIM3作为定时器,ADC1作为ADC模块。
```c
ADC_InitTypeDef ADC_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// 初始化ADC模块
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_Cmd(ADC1, ENABLE);
// 初始化定时器
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
TIM_TimeBaseStructure.TIM_Period = 72000000 / 1000 - 1; // 计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; // 分频系数
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; // 时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // 计数器向上计数
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
// 配置定时器触发ADC采样
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
ADC_ExternalTrigConvCmd(ADC1, ENABLE);
// 初始化定时器中断
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
```
最后,在定时器中断处理函数中进行ADC采样和串口输出。
```c
void TIM3_IRQHandler(void) {
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) {
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
uint16_t adcValue = ADC_GetConversionValue(ADC1);
USART_SendData(USART1, adcValue >> 8);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, adcValue & 0xff);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
}
```
这里的ADC采样结果为12位,需要将其转换为2字节整型输出。同时,由于定时器中断频率为1KHz,因此采样率也达到了要求。
完整代码如下: