From 798fa7fbb1d18715dbd421594af8f6e3a5c2c664 Mon Sep 17 00:00:00 2001
From: Olaf Rempel <razzor@kopf-tisch.de>
Date: Tue, 14 Oct 2014 21:45:04 +0200
Subject: [PATCH] ispprog2: keep ISP_RESET (/SS) as output

ISP_RESET is /SS pin of mega328p.
In master mode, the /SS pin must be configured as output.
If configured as input it must held high to ensure Master SPI operation.
---
 ispprog.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/ispprog.c b/ispprog.c
index b370c51..256ee66 100644
--- a/ispprog.c
+++ b/ispprog.c
@@ -86,13 +86,13 @@
 #define ISP_SCK         PORTB5          /* to target */
 #define RESET_IN        PORTB1          /* low active */
 
-#define ISP_INACTIVE()  {   /* ISP_SCK, ISP_MOSI and ISP_RESET are inputs */ \
-                            DDRB &= ~((1<<ISP_SCK) | (1<<ISP_MOSI) | (1<<ISP_RESET)); \
+#define ISP_INACTIVE()  {   /* ISP_SCK, ISP_MOSI are inputs, set ISP_RESET high */ \
+                            DDRB &= ~((1<<ISP_SCK) | (1<<ISP_MOSI)); \
                             PORTB |= (1<<ISP_RESET); \
                         };
 
 #define ISP_ACTIVE()    {   /* ISP_SCK, ISP_MOSI and ISP_RESET are outputs, set ISP_RESET low */ \
-                            DDRB |= ((1<<ISP_SCK) | (1<<ISP_MOSI) | (1<<ISP_RESET)); \
+                            DDRB |= ((1<<ISP_SCK) | (1<<ISP_MOSI)); \
                             PORTB &= ~(1<<ISP_RESET); \
                         };