I'm playing with avrs since few years now and i'm locked on a problem.
I'm making a boat GPS keyboard to use it with oppenplotter on raspberry. The keyboard will return kbd caracters to make shortcuts in oppenplotter (- for zoom-, + for zoom+, etc..)
I have an old NAVIONICS GPS and want to put the raspberry in it and keep the existing keyboard.
My board is SMD version with 20MHZ crystal. I use the same hardware as the example, exept for the keymapping (10 keys for the keyboard and 1 for toggling kbd lights).
I've modified the example to fit my hardware :
i use 1.8kohm pullup for D- and 3.6v zener diodes on both D+ and D-
Code: Select all
#define F_CPU 20000000ULThe new keyboard function works the same (returns 1 to 10 for each key and 0 for no key)
Code: Select all
static uchar keyPressed(void)
{
uchar i;
uint8_t bits = PINC;
if (!(bits & 1)) i=1; //Si un des bits est a 0 (!), i=valeurs correspondante
if (!(bits & 2)) i= 2;
if (!(bits & 8)) i= 3;
if (!(bits & 16)) i= 4;
if (!(bits & 32)) i= 5;
if (bits & 59) i=0; //cas ou tout est a 1 (32+16+8+2+1), pas de touche => i=0
bits = PINB;
if (!(bits & 2)){
i= 0;
PORTC ^= (1<<PC2); //^= : bascule
_delay_ms(10); //anti rebond (appui multiple)
}
if (!(bits & 16)) i= 6;
if (!(bits & 32)) i= 7;
if (bits & 50) i=0; //cas ou tout est a 1 (32+16+2), pas de touche => i=0
bits = PIND;
if (!(bits & 2)) i= 8;
if (!(bits & 32)) i= 9;
if (!(bits & 128)) i= 10;
if (bits & 162) i=0; //cas ou tout est a 1 (128+32+2), pas de touche => i=0
return i; //A la fin, on retourne la valeur de la touche (0 = pas de touche et de 1 à 10 : une touche)
}When i plug the device, windows says :"USB device not recognized etc ..."
The toggling lights works.
Is there anything else to modify in order to use 20MHZ ?
I'm thinking about the 22ms delay :
Code: Select all
if(TIFR & (1<<TOV0)){ /* 22 ms timer */
TIFR = 1<<TOV0;
if(idleRate != 0){
if(idleCounter > 4){
idleCounter -= 5; /* 22 ms in units of 4 ms */or the timer in hardwareInit() :
Code: Select all
/* configure timer 0 for a rate of 12M/(1024 * 256) = 45.78 Hz (~22ms) */
TCCR0 = 5; /* timer 0 prescaler: 1024 */Thanks for helping