STM32F030C8T6 定时器中断处理函数的详细代码,用于实现正弦波信号的矩形脉冲调制:上述这个代码中,while(1)语句中在主循环中执行其他任务指的是什么任务
时间: 2024-02-18 12:02:11 浏览: 74
下面是一个基本的 STM32F030C8T6 定时器中断处理函数的代码,用于实现正弦波信号的矩形脉冲调制:
```c
#include "stm32f0xx.h"
#define PI 3.1415926f
// 定义正弦波的离散数据
float sinTable[64] = {
0, 0.098017, 0.19509, 0.290285, 0.382683, 0.471397, 0.55557, 0.634393,
0.707107, 0.77301, 0.83147, 0.881921, 0.92388, 0.95694, 0.980785, 0.995185,
1, 0.995185, 0.980785, 0.95694, 0.92388, 0.881921, 0.83147, 0.77301,
0.707107, 0.634393, 0.55557, 0.471397, 0.382683, 0.290285, 0.19509, 0.098017,
0, -0.098017, -0.19509, -0.290285, -0.382683, -0.471397, -0.55557, -0.634393,
-0.707107, -0.77301, -0.83147, -0.881921, -0.92388, -0.95694, -0.980785, -0.995185,
-1, -0.995185, -0.980785, -0.95694, -0.92388, -0.881921, -0.83147, -0.77301,
-0.707107, -0.634393, -0.55557, -0.471397, -0.382683, -0.290285, -0.19509, -0.098017
};
// 定义定时器中断处理函数
void TIM3_IRQHandler(void) {
if (TIM3->SR & TIM_SR_UIF) {
static uint8_t dutyCycle = 0;
static uint8_t index = 0;
static uint8_t count = 0;
static float delta = PI / 32;
// 按照矩形脉冲周期调制正弦波
if (count < dutyCycle) {
GPIOA->ODR |= GPIO_ODR_4;
} else {
GPIOA->ODR &= ~GPIO_ODR_4;
}
// 更新计数器
count++;
if (count >= 100) {
count = 0;
dutyCycle += 2; // 调制周期为 2
if (dutyCycle > 98) {
dutyCycle = 0;
index++;
if (index >= 64) {
index = 0;
}
delta = PI * (index + 1) / 32;
}
}
// 更新正弦波的幅值
float value = sinTable[index] * (1 - dutyCycle / 100.0);
uint16_t pulse = (uint16_t)(value * 4095 / 3.3);
TIM3->CCR1 = pulse;
// 清除中断标志
TIM3->SR &= ~TIM_SR_UIF;
}
}
int main(void) {
// 配置 GPIOA 和 TIM3
RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
RCC->APB1ENR |= RCC_APB1ENR_TIM3EN;
GPIOA->MODER |= GPIO_MODER_MODER4_0;
GPIOA->AFR[0] |= GPIO_AFRL_AFSEL4_0 | GPIO_AFRL_AFSEL4_1;
TIM3->PSC = 9; // 预分频器为 10,计数频率为 8 MHz
TIM3->ARR = 799; // 计数器自动重载值为 800
TIM3->CCMR1 |= TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_1; // PWM 模式 1
TIM3->CCER |= TIM_CCER_CC1E; // 输出比较通道 1 使能
TIM3->DIER |= TIM_DIER_UIE; // 更新中断使能
// 启动定时器
TIM3->CR1 |= TIM_CR1_CEN;
// 注册定时器中断处理函数
NVIC_EnableIRQ(TIM3_IRQn);
// 主循环
while (1) {
// 在主循环中执行其他任务
// ...
}
}
```
在上述代码中,while(1) 语句中在主循环中执行其他任务指的是除了定时器中断处理函数以外的其他任务。这些任务可能包括但不限于:
- 初始化其他外设,比如 ADC、UART、SPI 等;
- 处理其他的中断事件;
- 等待用户输入或者其他事件;
- 执行其他的逻辑代码,比如控制流程、算法计算等等。
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