stm32-key.rar_STM32 键盘扫描_stm32 key_stm32 按键_stm32键盘

#define KeyPort GPIOA unsigned char KeyScan(void) //键盘扫描函数，使用行列逐级扫描法 { unsigned char Val; //KeyPort=0xf0;//高四位置高，低四位拉低 // KeyPort->BSRR=0x00f0; //KeyPort->BRR=0x000f; GPIO_SetBits(KEYPort,KEY44COL); GPIO_ResetBits(KEYPort,KEY44ROW); uint16_t Key44_Scan(void) { KEY44PORT->ODR &= ~KEY44ROW; //行线全部置0 if(((KEY44PORT->IDR)&KEY44COL)!=KEY44COL) { KEY44PORT->ODR |= KEY44ROW;//有按键时，行线全部置高电平，准备扫描 return (uint16_t)1; } else { KEY44PORT->ODR |= KEY44ROW; return (uint16_t)0; } } if(KeyPort!=0xf0)//表示有按键按下 { DelayMs(10); //去抖 if(KeyPort!=0xf0) { //表示有按键按下 KeyPort=0xfe; //检测第一行 if(KeyPort!=0xfe) { Val=KeyPort&0xf0; Val+=0x0e; while(KeyPort!=0xfe); DelayMs(10); //去抖 while(KeyPort!=0xfe); return Val; } KeyPort=0xfd; //检测第二行 if(KeyPort!=0xfd) { Val=KeyPort&0xf0; Val+=0x0d; while(KeyPort!=0xfd); DelayMs(10); //去抖 while(KeyPort!=0xfd); return Val; } KeyPort=0xfb; //检测第三行 if(KeyPort!=0xfb) { Val=KeyPort&0xf0; Val+=0x0b; while(KeyPort!=0xfb); DelayMs(10); //去抖 while(KeyPort!=0xfb); return Val; } KeyPort=0xf7; //检测第四行 if(KeyPort!=0xf7) { Val=KeyPort&0xf0; Val+=0x07; while(KeyPort!=0xf7); DelayMs(10); //去抖 while(KeyPort!=0xf7); return Val; } } } return 0xff; } /*------------------------------------------------ 按键值处理函数，返回扫键值 ------------------------------------------------*/ unsigned char KeyPro(void) { switch(KeyScan()) { case 0x7e:return 0;break;//0 按下相应的键显示相对应的码值 case 0x7d:return 1;break;//1 case 0x7b:return 2;break;//2 case 0x77:return 3;break;//3 case 0xbe:return 4;break;//4 case 0xbd:return 5;break;//5 case 0xbb:return 6;break;//6 case 0xb7:return 7;break;//7 case 0xde:return 8;break;//8 case 0xdd:return 9;break;//9 case 0xdb:return 10;break;//a case 0xd7:return 11;break;//b case 0xee:return 12;break;//c case 0xed:return 13;break;//d case 0xeb:return 14;break;//e case 0xe7:return 15;break;//f default:return 0xff;break; } }