[ts-7000] Keypad.c ...Key board routine

["LaksCEO" <>]

Hi

Can any one tell me how this portion of the code works in the keypad.c program ?

because when you scan the martix (4x4) each one of the row is made 0 and the column details are read

in such case the data to be sent out will be 1,2,4 and 8

 

where as here is it no 0,1,2 and 3 ??

 

unsigned int get_keys(void) {

unsigned int pos, on = 0;

for(pos = 0; pos < 4; pos++) {

*dat = ~(1 << pos);

on |= (~(*dat >> 4) & 0xf) << (4 * pos);

}

return on;

 

 

 

 

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