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check in RS485 patch

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This commit is contained in:
Piotr Dobrowolski 2021-02-27 16:45:03 +01:00
parent d1582cabd0
commit 4975df9472
2 changed files with 40 additions and 1 deletions
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28
0001-Disable-RS485-transceiver-when-running-the-bootloade.patch Normal file
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@ -0,0 +1,28 @@
From e2ff1e8bf05f0f8677e57c91b8cea78551f99413 Mon Sep 17 00:00:00 2001
From: Piotr Dobrowolski <admin@tastycode.pl>
Date: Mon, 25 Feb 2019 10:57:44 +0100
Subject: [PATCH] Disable RS485 transceiver when running the bootloader
---
optiboot/bootloaders/optiboot/optiboot.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/optiboot/bootloaders/optiboot/optiboot.c b/optiboot/bootloaders/optiboot/optiboot.c
index 9a2c80b..2bae2a8 100644
--- a/optiboot/bootloaders/optiboot/optiboot.c
+++ b/optiboot/bootloaders/optiboot/optiboot.c
@@ -690,6 +690,11 @@ int main(void) {
#endif
#endif
+ /* 2019/02/24 inf - disable rs485 transceiver */
+ PORTD &= ~_BV(3); // 0b1000;
+ PORTD |= _BV(2); // 0b0100;
+ DDRD |= _BV(2) | _BV(3); // 0b1100;
+
/* Forever loop: exits by causing WDT reset */
for (;;) {
/* get character from UART */
--
2.29.2

13
notes.md
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@ -8,5 +8,16 @@ Prog
====
* avrdude -c avrisp -b 19200 -p m328p -P /dev/ttyUSB5 -vvv
* avrdude -pm328pb -cstk500v1 -P/dev/ttyUSB5 -b19200 -e -Uefuse:w:0xf5:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m
// * avrdude -pm328pb -cstk500v1 -P/dev/ttyUSB5 -b19200 -e -Uefuse:w:0xf5:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m
* avrdude -pm328pb -cstk500v1 -P/dev/ttyUSB5 -b19200 -C avrdude.conf -e -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m
* avrdude -pm328pb -cstk500v1 -P/dev/ttyUSB5 -b19200 -Uflash:w:/home/informatic/.arduino15/packages/arduino/hardware/avr/1.6.8/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0x0F:m
* avrdude -pm328p -cstk500v1 -P/dev/ttyUSB5 -b19200 -Uflash:w:optiboot/optiboot/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0x0F:m
Full flash (no questions asked)
==========
```
sudo nix-shell -p avrdude --run 'avrdude -pm328pb -c usbasp -C avrdude.conf -e -Uefuse:w:0xf5:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m -Uflash:w:optiboot/optiboot/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0xCF:m'
sudo nix-shell -p avrdude --run 'avrdude -pm328p -c usbasp -C avrdude.conf -e -Uefuse:w:0xfD:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m -Uflash:w:optiboot/optiboot/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0xCF:m'
```