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uN_Eof
Joined: 17 May 2010
Posts: 29
Location: I live in Spain, with the toros, paella and tortilla
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| Slave SPI Inhibits SCK |
 Posted: Tue Aug 30, 2011 5:12 am |
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Hello all. I'm having a problem, when I configure SPI as a slave in a PIC18F4620 the PIC inhibits the clock signal coming from the master. SCK is always 0, and I don't know why.
Here is a piece of my code, if it helps.
| Code: |
void dsconf(){
input(DSATT);
input(DSCMD);
input(DSCLK);
setup_spi(SPI_SLAVE);
setup_spi(SPI_H_TO_L);
setup_spi(SPI_XMIT_L_TO_H);
enable_interrupts(INT_SSP);
enable_interrupts(GLOBAL);
}
ack(unsigned int us){
output_low(DSACK);
delay_us(us);
input(DSACK);
}
void write(unsigned int data, int doack=1){
spi_write(data);
if(doack)
ack(12);
}
#INT_SSP
void ssp_isr(){
command = spi_read(); //IMPORTANT STUFF
if(command == 0x01){
bytecount = 0;
output_high(green_led);
}
bytecount++; //INCREMENT BYTE COUNT
switch (bytecount){
case 1:
if(digital)
//write(0x41);
write(0xFE,1);
if(analog)
write(0x79,1);
if(config)
write(0xFF,1);
break;
case 2:
if(command == 0x42){
config = 0;
write(0x5A,1);
break;
}
if(command == 0xFF){
config = 1;
write(0x5A,1);
}
write(0x5A,1);
break;
case 3:
if(config == 0 && command == 0x00){
write(0xBD,1);
}
break;
case 4:
if(config == 0 && command == 0x00){
write(0xFF,0);
}
if(digital && !config)
bytecount = 0;
break;
case 5:
if(command == 0x00 && analog && !config){
write(rxjoy);
}
break;
case 6:
if(command == 0x00 && analog && !config){
write(ryjoy);
}
break;
case 7:
if(command == 0x00 && analog && !config){
write(lxjoy);
}
break;
case 8:
if(command == 0x00 && analog && !config){
write(lyjoy);
}
break;
case 9:
if(rtstat){
write(0xFF);
} else {
write(0x00);
}
break;
case 10:
if(ltstat){
write(0xFF);
} else {
write(0x00);
}
break;
case 11:
if(upstat){
write(0xFF);
} else {
write(0x00);
}
break;
case 12:
if(dwnstat){
write(0xFF);
} else {
write(0x00);
}
break;
case 13:
if(tristat){
write(0xFF);
} else {
write(0x00);
}
break;
case 14:
if(circstat){
write(0xFF);
} else {
write(0x00);
}
break;
case 15:
if(sqrstat){
write(0xFF);
} else {
write(0x00);
}
break;
case 16:
if(xstat){
write(0xFF);
} else {
write(0x00);
}
break;
case 17:
if(l1stat){
write(0xFF);
} else {
write(0x00);
}
break;
case 18:
if(r1stat){
write(0xFF);
} else {
write(0x00);
}
break;
case 19:
if(l2stat){
write(0xFF);
} else {
write(0x00);
}
break;
case 20:
if(r2stat){
write(0xFF);
} else {
write(0x00);
}
break;
}
} |
Thanks in advance.
Some additional info: I'm trying to emulate a PS2 controller, and I'm connecting my emulator (slave) to a PS2 to PS3 usb controller adaptor, but the same thing happens if I connect the slave to an actual PS2. |
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RF_Developer
Joined: 07 Feb 2011
Posts: 839
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| Posted: Tue Aug 30, 2011 6:11 am |
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I'm pretty sure setup_spi() doesn't work incrementally. In your code only the values in the last setup_spi will have any effect. Instead you have to or the values together in one setup_spi:
setup_spi(SPI_SLAVE | SPI_H_TO_L | SPI_XMIT_L_TO_H);
That might help.
RF Developer |
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uN_Eof
Joined: 17 May 2010
Posts: 29
Location: I live in Spain, with the toros, paella and tortilla
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| Posted: Tue Aug 30, 2011 6:14 am |
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| RF_Developer wrote: | I'm pretty sure setup_spi() doesn't work incrementally. In your code only the values in the last setup_spi will have any effect. Instead you have to or the values together in one setup_spi:
setup_spi(SPI_SLAVE | SPI_H_TO_L | SPI_XMIT_L_TO_H);
That might help.
RF Developer |
THANKS! Thank you so much... that seems to solve my problem... nobody knows how much I hate this kind of idiotic errors.... haha |
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