第七十二章：CH32V103应用教程——PWM输出-8路

草帽王子 · 发表于 2021-5-1 00:01:07

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本帖最后由草帽王子于 2021-9-10 18:03 编辑

在智能小车应用当中，我们通常需要使用PWM实现对电机的控制。本章教程主要使用TIM1和TIM2的共8个通道产生8路PWM输出。

1、TIM简介及相关函数介绍

关于TIM以及PWM的简介前面章节已经介绍，在此不再赘述。

2、硬件设计

本章教程使用TIM1和TIM2的共8个通道产生8路PWM输出，需要用到8个GPIO引脚，具体对应引脚见程序注释。

3、软件设计

本章教程主要进行简单的8路PWM输出，具体程序如下：
pwm.h文件

#ifndef __PWM_H
#define __PWM_H
#include "ch32v10x_conf.h"
void PWM_GPIO_Configuration(void);
void PWM_TIM_Configuration(void);
#endif

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pwm.h文件主要进行函数的声明；
pwm.c文件

#include "pwm.h"
//PWM输出通道对应GPIO引脚初始化配置
//此处使用TIM1和TIM2，对应通道分别为下：
//TIM2:CH1(PA0) CH2(PA1) CH3(PA2) CH4(PA3)
//TIM1:CH1(PA8) CH2(PA9) CH3(PA10) CH4(PA11)
void PWM_GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //打开管脚复用AFIO时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
//此处PA9引脚既作为USART_TX,又作为TIM1_CH2,需要进行复用操作
GPIO_PinRemapConfig(GPIO_FullRemap_TIM1,ENABLE); //更改指定管脚的映射。
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_8 | GPIO_Pin_9|GPIO_Pin_10 | GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
//定时器PWM输出配置
void PWM_TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_BaseInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BaseInitStructure.TIM_Period = 1000-1;
TIM_BaseInitStructure.TIM_Prescaler = 72-1;
TIM_BaseInitStructure.TIM_ClockDivision = 0;
TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_BaseInitStructure);
TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse = 200;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_Pulse = 400;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_Pulse = 600;
TIM_OC3Init(TIM1, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_Pulse = 800;
TIM_OC4Init(TIM1, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_BaseInitStructure.TIM_Period = 1000-1;
TIM_BaseInitStructure.TIM_Prescaler = 72-1;
TIM_BaseInitStructure.TIM_ClockDivision = 0;
TIM_BaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_BaseInitStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_BaseInitStructure);
TIM_ARRPreloadConfig(TIM2, ENABLE);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_Pulse =100;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_Pulse =300;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_Pulse =500;
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_OCInitStructure.TIM_Pulse =700;
TIM_OC4Init(TIM2, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM2, TIM_OCPreload_Enable);
TIM_Cmd(TIM1, ENABLE);
TIM_Cmd(TIM2, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM2, ENABLE);
}

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pwm.c文件主要进行定时器的PWM输出配置，与应用教程第八章PWM输出类似，主要进行8个通道的配置，具体过程及讲解可参考第八章。此外，此处还需要注意GPIO引脚的复用。
main.c文件

int main(void)
{
Delay_Init();
//USART_Printf_Init(115200);
//printf("SystemClk:%d\r\n",SystemCoreClock);
PWM_GPIO_Configuration();
PWM_TIM_Configuration();
while(1)
{
//TIM_SetCompare1(TIM1,500); //可对占空比进行修改
}
}

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main.c文件主要进行函数初始化。此外，若要对PWM输出占空比进行修改，可使用TIM_SetComparex函数（x为1、2、3、4）修改占空比。

4、下载验证

将编译好的程序下载到开发版并复位，PWM输出波形如下：

CH32V CH573单片机芯片-第七十二章：CH32V103应用教程——PWM输出-8路risc-v单片机中文社区(1)

CH32V CH573单片机芯片-第七十二章：CH32V103应用教程——PWM输出-8路risc-v单片机中文社区(2)

71、PWM输出-8路.rar
CH32V CH573单片机芯片-第七十二章：CH32V103应用教程——PWM输出-8路risc-v单片机中文社区(3)

71、PWM输出-8路.rar (443.75 KB, 下载次数: 14)
链接：https://pan.baidu.com/s/1K4iiv84G15E2k7itRnzndg
提取码：tr5y
复制这段内容后打开百度网盘手机App，操作更方便哦

完

▶ 语音朗读 · 发表于 2021-6-29 15:18:40

这个RISC-V 单片机共有7个定时器，
1个16位高级TIM1,
3个16位通用TIM,
2个看门狗
1个系统时间

▶ 语音朗读 · 发表于 2021-6-29 15:20:37

RV32IMAC开源指令集，CORE MAX:80MHz,建议72MHz

▶ 语音朗读 · 发表于 2021-6-29 15:29:34

APB2-------TIM1 4个通道，CH1,CH2,CH3,CH4
APB1-------TIM2 4个通道，CH1,CH2,CH3,CH4
APB1-------TIM3 4个通道，CH1,CH2,CH3,CH4
APB1-------TIM4 4个通道，CH1,CH2,CH3,CH4

孔明 · 发表于 2021-6-29 15:59:00

目前RISC-V-CH32V103能输出PWM脉冲的引脚有
PA0-TIM2CH1
PA1-TIM2CH2
PA2-TIM2CH3
PA3-TIM2CH4
PA6-TIM3CH1.TIM1BKIN
PA7-TIM3CH2,TIM1CH1N
PA8-TIM1CH1
PA9-TIM1CH2
PA10-TIM1CH3
PA11-TIM1CH4
PA12-TIM1ETR
PA15--TIM2CH1,TIM2ETR

PB0-TIM3CH3,TIM1CH2N
PB1-TIM3CH4,TIM1CH3N
PB3--TIM2CH2
PB4--TIM3CH1
PB5--TIM3CH2
PB6-TIM4CH1
PB7-TIM4CH2
PB8-TIM4CH3
PB9-TIM4CH4
PB10-TIM2CH3
PB11-TIM2CH4
PB12-TIM1BKIN
PB13-TIM1CH1N
PB14-TIM1CH2N
PB15-TIM1CH3N

PC6-TIM3CH1
PC7-TIM3CH2
PC8-TIM3CH3
PC9-TIM3CH4

PD2-TIM3ETR