static void scan_keypad(void)
{
volatile unsigned int temp = 0;
volatile int i;
port1_init();
temp = readl(S3C64XX_GPNDAT);
if((temp & (1 << 0)) == 0){
key_delay(); //去延时抖动
row_value= 1;
}
else if((temp & (1 << 1)) == 0){
key_delay();
row_value= 2;
}
else if((temp & (1 << 2)) == 0){
key_delay();
row_value = 3;
}
else if((temp & (1 << 3)) == 0) {
key_delay();
row_value = 4;
}
for (i=0; i<10000; i++) asm ("");
port2_init();
temp = readl(S3C64XX_GPNDAT);
if(temp & (1 << 5)){
col_value = 1;
}
else if(temp & (1 << 6)){
col_value = 2;
}
else if(temp & (1 << 9)){
col_value = 3;
}
else if(temp & (1 << 10)){
col_value = 4;
}
else if(temp & (1 << 12)){
col_value = 5;
}
/*reset GPNDAT 5 6 9 10 12 low level */
/*The most important step*/
temp = readl(S3C64XX_GPNDAT);
temp &= ~(1 << 5) & ~(1 << 6) & ~(1 << 9) & ~(1 << 10) & ~(1 << 12);
temp |= (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3);
writel( temp, S3C64XX_GPNDAT);
}
void ports_init(void) // initializes all 11 ports
{
port0_init();
port1_init();
port2_init();
port3_init();
port4_init();
port5_init();
port6_init();
port7_init();
port8_init();
port9_init();
port10_init();
}
