razzor/ispprog
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fix reset handling

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This commit is contained in:
Olaf Rempel 2006-05-07 15:35:21 +02:00
parent a0f49ed94d
commit cef12b5a51
1 changed files with 19 additions and 4 deletions
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23
ispprog.c
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@ -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 <avr/io.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
@ -108,15 +123,15 @@ void led_mode(uint8_t mode)
/* Control reset and SPI lines */ /* Control reset and SPI lines */
void set_reset(uint8_t mode) void set_reset(uint8_t mode)
{ {
// set reset high, make SCK & MOSI inputs // make RESET, SCK and MOSI inputs
if (mode) { if (mode) {
DDRB &= ~((1<<PORTB7) | (1<<PORTB5) | (1<<PORTB1));
PORTB |= (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 { } else {
DDRB |= ((1<<PORTB7) | (1<<PORTB5) | (1<<PORTB1));
PORTB &= ~(1<<PORTB1); PORTB &= ~(1<<PORTB1);
DDRB |= ((1<<PORTB7) | (1<<PORTB5));
} }
// wait 50ms // wait 50ms