HiI have been using STM8 and SDCC for about 2 months now.I'm facing an issue
these last two days that I can't seem to figure out. The code is supposed to
read an input port, confirm the key is pressed for 8 seconds, then call another
routine for further 3 key inputs.There's a tim2 interrupt(overflow) - not shown
in the code below - that runs every 125 mS. The interrupt is used to keep track
of key pressed duration and to flash an LED when needed.
This is my code:
//defines #define UPKey_Pin 6 //c6#define LU_PIN 5 //c5 //led thats supposed
to be ON when the key is pressed in keypress function.
#define upval 0xaa //up key value
//variableschar tixnow, ticks, itix, six8cnt, ticker8, keyval;
void main(void){
PC_CR1 |= (1 << UPKey_Pin); //define PortC6 as input port...
<snip> if(!(PC_IDR & (1 << UPKey_Pin))) { //wait for timer tick delay to
confirm key press, tixnow=ticks; while(tixnow==ticks); //ticks
increases 8 times a second, in a tim2 interrupt, which also updates ticker15
and ticker8 if(!(PC_IDR & (1 << UPKey_Pin))) { //key press confirmed, timer
started to verify, wait till key released, then run key function
six8cnt=ticker8; //ticker8 changes every 8 seconds
while(!(PC_IDR & (1 << UPKey_Pin))); //wait till key released if
(ticker8!=six8cnt)keypress(); //if the count is more than 8 seconds long, run
the function//Till here the code works just as it should, the key pressed for 8
seconds is recognized and the keypress function is called } }
....<snip>// Here the keyval returned is further
processed.}//------------------------------------------------void
keypress(void){ itix=ticker15; //ticker15 changes every 15 seconds
while(itix==ticker15) {
//The program reaches till here, I checked by switching ON another free test
port bit.
if(!(PC_IDR & (1 << UPKey_Pin))) { //wait for tick delay to confirm key
press, tixnow=ticks;
while(tixnow==ticks); if(!(PC_IDR & (1 << UPKey_Pin))) { PC_ODR |= (1 <<
LU_PIN); //set Led ON while(!(PC_IDR & (1 << UPKey_Pin))); //wait till key
released keyval=upval; PC_ODR &= ~(1 << LU_PIN); //set LU OFF return; }
}...<snip>//Here some other key press checks, with ditto code as above, which
also don't get recognized.... }
}
Thanks and Warm Regards
Shiv
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