本文最后修改时间：2026年09月15日
一、本节简介
本文介绍如何使用MT32F006使用PWM控制白光的背光灯。
二、实验平台
库版本：V1.0.0
编译软件：MDK5.37
硬件平台：MT32F006开发板（主芯片MT32F006）
仿真器：JLINK
三、版权声明
1）作者：甜甜的大香瓜
2）声明：喝水不忘挖井人，转载请注明出处。
3）本文出处：原创连载资料《简单粗暴学MT32F006》
四、实验前提
1、在进行本文步骤前，请先阅读以下章节：
1）《简单粗暴学MT32F006》的"第一章和第二章"章节。
2）《简单粗暴学MT32F006》的《MT32F006之PWM控制背光灯（RGB）》。
2、在进行本文步骤前，请先实现以下章节：
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五、基础知识
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六、硬件原理
七、实验步骤
1 、编写并添加驱动
1 ）编写驱动GUA_PWM.c（存放在"......\Projects\MT006_StdPeriph_Templates\GUA"）
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| //********************************************************************** //name: GUA_PWM.c //introduce: PWM驱动 //author: 甜甜的大香瓜 //email: 897503845@qq.com //shop: opengua.taobao.com //changetime: 2023.04.11 //********************************************************************** #include "GUA_PWM.h" /*********************宏定义************************/ #define GUA_PWM_PRESCALE 1 //PWM 分频系数 #define GUA_PWM_FREQ 4000 //PWM 频率4k /*********************全局变量************************/ //GUA_U8 gGUA_PWM_DutyCycle =0; //********************************************************************** //name: GUA_PWM_Set //introduce: PWM的设置 //parameter: nGUA_PWM_Channel:GUA_PWM_CHANNEL_R or GUA_PWM_CHANNEL_G or GUA_PWM_CHANNEL_B // nGUA_PWM_DutyCycle:占空比0~100 // nGUA_NewState:GUA_PWM_ENABLE or GUA_PWM_DISABLE //return: none //author: 甜甜的大香瓜 //email: 897503845@qq.com //shop: opengua.taobao.com //changetime: 2023.04.11 //********************************************************************** void GUA_PWM_Set(GUA_U32 nGUA_PWM_Channel, GUA_U16 nGUA_PWM_DutyCycle, FunctionalState nGUA_NewState) { MCPWM_InitTypeDef MCPWM_InitStructure; uint32_t hclk = RCC_GetClocksFreq(RCC_CLOCKFREQ_SYSAHBCLK); //通道0和通道1都是用的MCOA，极性相同 //if((nGUA_PWM_Channel == MCPWM_CHANNEL_0) || (nGUA_PWM_Channel ==MCPWM_CHANNEL_1)) { MCPWM_InitStructure.MCPWM_Channel = nGUA_PWM_Channel; //通道 MCPWM_InitStructure.MCPWM_Match = hclk/GUA_PWM_PRESCALE / GUA_PWM_FREQ / 2 *(100-nGUA_PWM_DutyCycle)/100 -1; MCPWM_InitStructure.MCPWM_Limit = hclk/GUA_PWM_PRESCALE / GUA_PWM_FREQ /2 - 1; MCPWM_InitStructure.MCPWM_DeadTime = 1; //死区时间为200ns MCPWM_InitStructure.MCPWM_Center = MCPWM_CENTER_CA; //中心对齐模式 MCPWM_InitStructure.MCPWM_Update = MCPWM_Update_EN; //MCPWM运行时可以更新PWM周期、占空比 MCPWM_InitStructure.MCPWM_Polarity = MCPWM_Polarity_ILAH; //无效状态为低电平，有效状态为高电平 MCPWM_Init(&MCPWM_InitStructure); MCPWM_Cmd(nGUA_PWM_Channel, nGUA_NewState); } /* //通道2是用的MCOB，极性相反 //else { MCPWM_InitStructure.MCPWM_Channel = nGUA_PWM_Channel; //通道 MCPWM_InitStructure.MCPWM_Match = hclk/GUA_PWM_PRESCALE / GUA_PWM_FREQ / 2 *(100-nGUA_PWM_DutyCycle)/100 -1; MCPWM_InitStructure.MCPWM_Limit = hclk/GUA_PWM_PRESCALE / GUA_PWM_FREQ /2 - 1; MCPWM_InitStructure.MCPWM_DeadTime = 1; //死区时间为200ns MCPWM_InitStructure.MCPWM_Center = MCPWM_CENTER_CA; //中心对齐模式 MCPWM_InitStructure.MCPWM_Update = MCPWM_Update_EN; //MCPWM运行时可以更新PWM周期、占空比 MCPWM_InitStructure.MCPWM_Polarity = MCPWM_Polarity_IHAL; //无效状态为高电平，有效状态为低电平 MCPWM_Init(&MCPWM_InitStructure); MCPWM_Cmd(nGUA_PWM_Channel, nGUA_NewState); }*/ } //********************************************************************** //name: GUA_PWM_Init //introduce: PWM初始化 //parameter: none //return: none //author: 甜甜的大香瓜 //email: 897503845@qq.com //shop: opengua.taobao.com //changetime: 2023.04.11 //********************************************************************** void GUA_PWM_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; uint32_t MCPWM_Prescale = GUA_PWM_PRESCALE; //PIO2_0 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_Level_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_3; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIO2, &GPIO_InitStructure); RCC_APBPeriphClockCmd(RCC_AHBCLKCTRL_MCPWM, ENABLE); //MCPWM_DeInit(); MCPWM_SetPrescale(MCPWM_Prescale); //初始化通道 GUA_PWM_Set(GUA_PWM_CHANNEL_WHITE, 100, GUA_PWM_ENABLE); } |
2 ）编写驱动头文件GUA_PWM.h
（存放在"......\Projects\MT006_StdPeriph_Templates\GUA"）
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| //********************************************************************** //name: GUA_PWM.h //introduce: PWM驱动的头文件 //author: 甜甜的大香瓜 //email: 897503845@qq.com //shop: opengua.taobao.com //changetime: 2023.04.11 //********************************************************************** #ifndef GUA_PWM_H #define GUA_PWM_H /*********************头文件************************/ #include "mt006.h" /*********************宏定义************************/ //类型宏 #ifndef GUA_C typedef char GUA_C; #endif #ifndef GUA_U8 typedef unsigned char GUA_U8; #endif #ifndef GUA_8 typedef signed char GUA_8; #endif #ifndef GUA_U16 typedef unsigned short GUA_U16; #endif #ifndef GUA_16 typedef signed short GUA_16; #endif #ifndef GUA_U32 typedef unsigned long GUA_U32; #endif #ifndef GUA_32 typedef signed long GUA_32; #endif //白灯通道MCOA2的2通道(之前有RGB三色灯，现已去除) #define GUA_PWM_CHANNEL_WHITE MCPWM_CHANNEL_2 //通道开关 #define GUA_PWM_ENABLE ENABLE //PWM 通道开启 #define GUA_PWM_DISABLE DISABLE //PWM 通道关闭 /*********************外部全局变量声明************************/ //extern GUA_U8 gGUA_PWM_DutyCycle; /*********************外部函数声明************************/ extern void GUA_PWM_Set(GUA_U32 nGUA_PWM_Channel, GUA_U16 nGUA_PWM_DutyCycle, FunctionalState nGUA_NewState); extern void GUA_PWM_Init(void); #endif |
3 ）工程中添加驱动文件
4 ）在MDK设置中添加驱动源文件路径
2 、添加库的驱动
1）添加库的驱动文件（为了方便一次性都添加进来，已有则不用添加） 
2 ）添加库的驱动头文件（mt006_conf.h 中）（为了方便一次性都添加进来，已有则不用添加）
3 、在应用层中调用
1 ）添加驱动头文件（main.c中）
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| #include "GUA_PWM.h" |
2 ）添加驱动初始化代码（main.c的main函数中）
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| //白光背光灯初始化 GUA_PWM_Init(); |
3 ）添加测试代码（main.c的main函数中）
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| GUA_PWM_Set(GUA_PWM_CHANNEL_WHITE, 0, GUA_PWM_ENABLE);//关 //加延时 GUA_PWM_Set(GUA_PWM_CHANNEL_WHITE, 50, GUA_PWM_ENABLE);//50%亮度 //加延时 GUA_PWM_Set(GUA_PWM_CHANNEL_WHITE, 100, GUA_PWM_ENABLE);//最亮 |
八、注意事项
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九、实验结果
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