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fix reset handling

master
Olaf Rempel 15 years ago
parent
commit
cef12b5a51
  1. 23
      ispprog.c

23
ispprog.c

@ -1,3 +1,18 @@
/*
* C based avr910 / avr109 ISP Adapter
*
* (c) 05/2006 by Olaf Rempel
* <razzor at kopf minus tisch dot de>
*
* using ATmega16 @7.3728MHz:
* PB1 = /Reset (to target)
* PB3 = /LED
* PB5 = MOSI (to target)
* PB6 = MISO (to target)
* PB7 = SCK (to target)
* PD3 = reset-in
*
*/
#include <avr/io.h>
#include <stdio.h>
#include <stdlib.h>
@ -108,15 +123,15 @@ void led_mode(uint8_t mode)
/* Control reset and SPI lines */
void set_reset(uint8_t mode)
{
// set reset high, make SCK & MOSI inputs
// make RESET, SCK and MOSI inputs
if (mode) {
DDRB &= ~((1<<PORTB7) | (1<<PORTB5) | (1<<PORTB1));
PORTB |= (1<<PORTB1);
DDRB &= ~((1<<PORTB7) | (1<<PORTB5));
// set reset low, make SCK & MOSI outputs
// make RESET, SCK & MOSI outputs, set RESET low
} else {
DDRB |= ((1<<PORTB7) | (1<<PORTB5) | (1<<PORTB1));
PORTB &= ~(1<<PORTB1);
DDRB |= ((1<<PORTB7) | (1<<PORTB5));
}
// wait 50ms

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