STM32单片机PVD功能操作流程解析
STM32内部自带PVD功能,用于对MCU供电电压VDD进行监控。通过电
源控制寄存器中的PLS[2:0]位可以用来设定监控电压的阀值,通过对外部电压进行比较
来监控电源。当条件触发,需要系统进入特别保护状态,执行紧急关闭任务:对系统的
一些数据保存起来,同时对外设进行相应的保护操作。
操作流程:
1)、
系统启动后启动PVD,并开启相应的中断。
PWR_PVDLevelConfig(PWR_PVDLevel_2V8); // 设定监控阀值
PWR_PVDCmd(ENABLE); // 使能PVD
EXTI_StrucTInit(
EXTI_InitStructure.EXTI_Line = EXTI_Line16; // PVD连接到中断线16上
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //使用中断模式
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Raising;//电压低于阀值时产生中断
EXTI_InitStructure.EXTI_LineCmd = ENABLE; // 使能中断线
EXTI_Init( // 初始
EXTI_InitStructure.EXTI_Trigger的赋值可选项:
EXTI_Trigger_Rising---表示电压从高下降到低于设定阀值时产生中断;
EXTI_Trigger_Falling---表示电压从低上升到高于设定阀值时产生中断;
EXTI_Trigger_Rising_Falling---表示电压上升或下降越过设定阀值时都产生中断。
2)、当工作电压低于设定阀值时,将产生PVD中断,在中断程序中进行相应的处理:
void PVD_IRQHandler(void)
{
EXTI_ClearITPendingBit(EXTI_Line16);
…… // 用户添加紧急处理代码处
}
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温馨提示
本程序使用STM32F103C8T6作为主控单片机,4针0.96寸OLED屏幕作为显示。采用硬件IIC方式,硬件IIC的特点就是比模拟IIC数据传输速度快,并且数据传输速度是可控的。程序可完成基本的英文字符显示、数字显示以及汉字显示,也可实现画点、画线以及图片的显示。该程序经本人测试可以正常使用,也可先去搜索我的同名博客(STM32F103C8T6硬件IIC控制4针0.96寸OLED显示屏)先查看是否符合你的要求再进行下载,以免浪费下载积分,博客内容介绍有如何获取字模等步骤。
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