安装SDK资源包
点击工具栏上SDK管理器，在弹窗上依次勾选安装RT-Thread_Source_Code latest、AB32VG1-AB-PROUGEN 1.0.8、ToolChain_Support_Packages/RISC-V-GCC 10.1.0资源包
新建工程
点击文件->新建->RT-Thread项目，弹出新建项目窗口，选择基于开发板，填写项目名AB32VG1_BreathingLamp，开发板选择AB32VG1-AB-PROUGEN，完成新建项目
右击项目工程名，选择下拉菜单中“属性”，弹出属性框，选择MCU->RISC-V Toolchains Paths，修改配置ToolChain folder路径为 D:\RT-ThreadStudio\repo\Extract\ToolChain_Support_Packages\RISC-V\RISC-V-GCC\10.1.0\bin
查看开发板原理图AB32VG1_Prougen_Schematic_V02，RGB LED分别通过短路帽连接到芯片PE1、PE4、PA1引脚，这里通过杜邦线将LED蓝色控制脚连接到芯片PB0 (Timer3PWM)引脚
配置PWM
双击项目的RT-Thread Setting，进入配置界面，点击更多配置
进入更多配置后，选择硬件选项，使能PB0引脚PWM，保存配置
在application文件夹中，新建pwm.c文件
编写pwm程序:
#define PWM_DEV_NAME "t3pwm" /* PWM设备名称 */#define PWM_DEV_CHANNEL 1 /* PWM通道 */ struct rt_device_pwm *pwm_dev; /* PWM设备句柄 */ rt_uint32_t period, pulse; rt_uint8_t direction = 0; void Pwm_Init(void) { period = 1000; /* 周期值,1M/period kHz */ pulse = 0; /* PWM脉冲宽度值,占空比=pulse/period */ //查找t3pwm是否在系统设备注册表中 pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME); if (pwm_dev == RT_NULL) { rt_kprintf("Can't find device:%s\n", PWM_DEV_NAME); return; } /* 设置PWM周期、脉冲宽度 */ rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse); /* 使能设备 */ rt_pwm_enable(pwm_dev, PWM_DEV_CHANNEL); } //PWM线程函数 static void PWM_Thread_Entry(void *para) { Pwm_Init(); while(1) { //蓝灯呼吸灯闪烁 if(direction == 0) { pulse += 10; if(pulse >= period - 10) { direction = 1; pulse = period - 10; } } else { pulse -= 10; if(pulse < 1) { direction = 0; pulse = 0; } } rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse); rt_thread_mdelay(2); } } //动态创建PWM线程启动函数 int Pwm_Thread_Init(void) { rt_thread_t pwm_thread; pwm_thread = rt_thread_create( "pwm_thread", PWM_Thread_Entry, RT_NULL, 1024, 10, 10); if (pwm_thread != RT_NULL) { rt_thread_startup(pwm_thread); } return RT_EOK; } INIT_APP_EXPORT(Pwm_Thread_Init); //PWM线程初始化添加到系统初始化中
复制代码蓝色呼吸灯效果:
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