代码搜索：KeyScan

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热门代码： main.c GPIO I2C SPI UART timer interrupt ADC PWM LED
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c irq.c

unsigned char keyscan(void) { P1=0x0f; if((P1&0x0f)!=0x0f) { flag=1; P1=0xef; switch(P1&0x0f) { case 0x0e:while((P1&0x0f)!=0x0f);return('*'); case 0x0d:while((P1&0x0f)!=0x0f
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