ATtiny10 Reset as mode button
Attiny10 Reset as mode button:
Since I did not want do the high voltage programming (even though I built one for my Attiny13a's and Attiny85's. I wanted the simplest way to implement a mode button on the ATtiny10. Thanks to https://sites.google.com/site/wayneholder/using-the-avr-reset-pin-as-an-input (Wayne's Tinkering Page), who had done this for Attinyx5 series chips. I worked at it only for a little bit and got the ATtiny10 working with it.. (Thanks Wayne!!).
If you want to understand how it works. Go see Waynes sight. But the gist of it is taking advantage of reset flag. and memory not cleared by reset.
Attiny10 code I used:
/*
ATtiny10
+====+
SCK -> PB0 |* | PB3 (RESET)
GND | | Vcc
MOSI -> PB1 | | PB2
+====+
Modified By Sherm
from original code of:
https://sites.google.com/site/wayneholder/using-the-avr-reset-pin-as-an-input
Thanks Wayne..
*/
#include <avr/io.h>
#define EXT_RESET (1 << EXTRF)
volatile unsigned char count __attribute__((section(".noinit"))); // Not cleared on RESET
int main () {
// Any type of RESET clears the IO Regs, so we always need to reconfigure them
DDRB = 0b00000111;
if ((RSTFLR & EXT_RESET) != 0) {
//if ((RSTFLR & 1) != EXT_RESET) {
// If External RESET then increment count and output to pins
RSTFLR = RSTFLR & ~EXT_RESET;
//MCUSR = MCUSR & ~EXT_RESET;
PORTB = ++count;
} else {
// Else, set count to zero and output to pins
PORTB = count = 0;
}
while (1) {
}
}
