IO 口偶尔出现毛刺误触发？分享一套实用软件滤波算法

一、简介在PCBA上有一些过大电流的地方如果有I/O电平操作这时就容易受干扰可能会偶发出现一个毛刺影响功能为了设备稳定运行通常会采用I/O口滤波处理把偶发的毛刺给过滤掉。二、I/O电平滤波算法//数据类型定义 typedef enum IoLevel_e { PS_IO_LEVEL_HIGH, PS_IO_LEVEL_LOW, PS_IO_LEVEL_NUM }g_emIoLevel; g_emIoLevel g_emLedLevel PS_IO_LEVEL_NUM; //I/O电平滤波处理 g_emIoLevel PS_GetIoElecLevel(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, uint16_t u16FiltNum) { static g_emIoLevel semRetVal PS_IO_LEVEL_NUM; static uint16_t s_u16HighLevelCnt 0; static uint16_t s_u16LowLevelCnt 0; if(HAL_GPIO_ReadPin(GPIOx,GPIO_Pin) GPIO_PIN_SET) { s_u16HighLevelCnt; if(s_u16HighLevelCnt u16FiltNum) { s_u16HighLevelCnt 0; semRetVal PS_IO_LEVEL_HIGH; } s_u16LowLevelCnt 0; } else { s_u16LowLevelCnt; if(s_u16LowLevelCnt u16FiltNum) { semRetVal PS_IO_LEVEL_LOW; } s_u16HighLevelCnt 0; } return semRetVal; } /***********************函数调用****************************/ g_emLedLevel PS_GetIoElecLevel(GPIOA, GPIO_PIN_0, 500); if(g_emLedLevel PS_IO_LEVEL_HIGH) { HAL_GPIO_WritePin(LED4_GPIO_PORT, LED4_PIN, GPIO_PIN_SET); } else if(g_emLedLevel PS_IO_LEVEL_LOW) { HAL_GPIO_WritePin(LED4_GPIO_PORT, LED4_PIN, GPIO_PIN_RESET); }