矩阵键盘翻转法检测一行或者一列读出的值是一样的

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uint8_t KeyScan(void){uint8_t MKeyCord_h, MKeyCord_l, MKeyCord,i,temp; MKey_Port=0x0f;MKeyCord_h = MKey_Port & 0x0f;if(MKeyCord_h!=0x0f){bsp_DelayMs(10);MKey_Port=0x0f;if((MKey_Port & 0x0f)!=0x0f){MKeyCord_h = MKey_Port & 0x0f;bsp_Usart1Printf("MKeyCord_h is: %drn",(int)MKeyCord_h);MKey_Port  = MKeyCord_h | 0xf0;MKeyCord_l = MKey_Port & 0xf0;bsp_Usart1Printf("MKeyCord_l is: %drn",(int)MKeyCord_l);MKeyCord   = MKeyCord_l + MKeyCord_h;while((MKey_Port & 0xf0)!=0xf0);bsp_Usart1Printf("MKeyCord is: %drn",(int)MKeyCord);switch(MKeyCord){case 0xee: i = 0; break;case 0xed: i = 1; break;case 0xeb: i = 2; break;case 0xe7: i = 3; break;case 0xde: i = 4; break;case 0xdd: i = 5; break;case 0xdb: i = 6; break;case 0xd7: i = 7; break;case 0xbe: i = 8; break;case 0xbd: i = 9; break;case 0xbb: i = 10; break;case 0xb7: i = 11; break;case 0x7e: i = 12; break;case 0x7d: i = 13; break;case 0x7b: i = 14; break;case 0x77: i = 15; break;default : break;}}}return i;}