CH32V307 定时器10PWM输出
时间: 2023-10-28 08:56:24 浏览: 47
CH32V307 有 6 个定时器,其中 TIM0~TIM3 支持 PWM 输出。但是每个定时器最多只支持 4 路 PWM 输出,所以不能直接使用一个定时器实现 10 路 PWM 输出。不过可以使用多个定时器协同工作来实现。
以下是一个示例代码,使用 TIM0、TIM1 和 TIM2 实现 10 路 PWM 输出:
```c
#include "ch32v30x.h"
void PWM_Init(void)
{
// GPIO 初始化
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
// 定时器时钟使能
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM0 | RCC_APB1Periph_TIM1 | RCC_APB1Periph_TIM2, ENABLE);
// 定时器基本配置
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 999; // 1 kHz 的 PWM 频率
TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / 1000000 - 1; // 定时器时钟为 1 MHz
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
// PWM 配置
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
// TIM0 配置
TIM_TimeBaseInit(TIM0, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_Pulse = 0; // 占空比 0%
TIM_OC1Init(TIM0, &TIM_OCInitStructure);
TIM_OC2Init(TIM0, &TIM_OCInitStructure);
TIM_OC3Init(TIM0, &TIM_OCInitStructure);
TIM_OC4Init(TIM0, &TIM_OCInitStructure);
TIM_Cmd(TIM0, ENABLE);
// TIM1 配置
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_Pulse = 0; // 占空比 0%
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
TIM_Cmd(TIM1, ENABLE);
// TIM2 配置
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_Pulse = 0; // 占空比 0%
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
TIM_OC4Init(TIM2, &TIM_OCInitStructure);
TIM_Cmd(TIM2, ENABLE);
}
void PWM_SetDutyCycle(uint8_t channel, uint16_t duty_cycle)
{
if (duty_cycle > 999) {
duty_cycle = 999;
}
if (channel < 4) {
TIM_SetCompare1(TIM0, duty_cycle);
TIM_SetCompare2(TIM0, duty_cycle);
TIM_SetCompare3(TIM0, duty_cycle);
TIM_SetCompare4(TIM0, duty_cycle);
} else if (channel < 8) {
TIM_SetCompare1(TIM1, duty_cycle);
TIM_SetCompare2(TIM1, duty_cycle);
TIM_SetCompare3(TIM1, duty_cycle);
TIM_SetCompare4(TIM1, duty_cycle);
} else {
TIM_SetCompare1(TIM2, duty_cycle);
TIM_SetCompare2(TIM2, duty_cycle);
TIM_SetCompare3(TIM2, duty_cycle);
TIM_SetCompare4(TIM2, duty_cycle);
}
}
```
以上代码使用了 TIM0、TIM1 和 TIM2 三个定时器,分别控制前 8 路和后 2 路 PWM 输出。PWM_SetDutyCycle 函数用于设置指定通道的占空比,channel 参数为通道编号,范围为 0~9,duty_cycle 参数为占空比,范围为 0~999。
需要注意的是,以上代码没有考虑到定时器的计数值溢出问题,需要根据实际情况进行优化。另外,由于 CH32V307 的定时器功能比较简单,所以需要手动计算定时器时钟频率和占空比值。如果需要更加灵活的 PWM 配置,可以考虑使用外部 PWM 控制芯片或者更加强大的定时器模块。