This is an LED driver with brightness control.
I have it kind of working, but I can't write to a single register, I can only write with autoincrement on and writing multiple registers.
I'm hoping someone has figured it out.
It could be my i2c driver I suppose....
Here's the data sheet;
Well, it appears to be straight-up I2C. Reading and writing a register is one of the most fundamental things to do after proper addressing and ack/nak recognition.
First, can you read a single register?
Second, there has to be a distinction between the end of a single write and and the end of the first write in a multiple write sequence. Are you terminating that single write properly?
Jim
//--------------------------
void spiout8(char c){
//send c out spi
char stat,cnt;
SPDR=c; //char to spi
cnt=0;
do{
stat=SPSR;
cnt++;
if(cnt==255){
cprintf("spi write timeout! ");
break;
}
}while((stat & 0x80)==0);
}
//------TLC59282 16 ch const current led driver----------
#define LATHI() PORTF |= 0x02 //pf1
#define LATLO() PORTF &= ~0x02
//----------------------------
void updateledspacked(void){
//update leds on spi
//ledpacked are hi bit first. Sent out spi lsb first 3,2,1,0
unsigned int n;
for(n=0; n < 4; n++){
spiout8(ledpacked[3-n]);
}
LATHI(); //shake the latch line
LATLO();
}
I had 2 of the 16 bit chips (32 leds) in series, so this routine sends 4 bytes then shakes the latch,
Keith,
It looks like regular I2C protocol. Auto-increment is generally the most convenient way to access multiple registers.
OTOH, you can do it one at a time if you want.
I suspect that your I2C device will work much the same as Bob's SPI device. But you might need to smoke a bit before you reach Bob's consciousness level.
David.
My crystal ball said the commands are probably similar. Same led driver, different io
I'm suspecting my I2C driver.
What do you guys use?
ATMega164 and C or C++