From 3c89a3564507cb1f46d8f69d1aa56542ee2cafc6 Mon Sep 17 00:00:00 2001
From: Martin Preuss <martin@aquamaniac.de>
Date: Mon, 4 May 2026 21:45:50 +0200
Subject: [PATCH] e05: use 23LC512 (RAM) and 25LC256 (EEPROM) via spi_sw.

---
 avr/devices/e05/defs.asm      | 42 +++++++++++++++++++++++++++++++++++
 avr/devices/e05/main/main.asm | 14 +++++++++++-
 2 files changed, 55 insertions(+), 1 deletion(-)

diff --git a/avr/devices/e05/defs.asm b/avr/devices/e05/defs.asm
index 7fc7b89..197ca10 100644
--- a/avr/devices/e05/defs.asm
+++ b/avr/devices/e05/defs.asm
@@ -72,3 +72,45 @@
 
 
 
+; ---------------------------------------------------------------------------
+; software SPI module
+
+
+.equ SPISW_MOSI_DDR    = DDRA
+.equ SPISW_MOSI_INPUT  = PINA
+.equ SPISW_MOSI_OUTPUT = PORTA
+.equ SPISW_MOSI_PIN    = PORTA6
+
+.equ SPISW_MISO_DDR    = DDRA
+.equ SPISW_MISO_INPUT  = PINA
+.equ SPISW_MISO_OUTPUT = PORTA
+.equ SPISW_MISO_PIN    = PORTA5
+
+.equ SPISW_SCK_DDR     = DDRA
+.equ SPISW_SCK_INPUT   = PINA
+.equ SPISW_SCK_OUTPUT  = PORTA
+.equ SPISW_SCK_PIN     = PORTA4
+
+
+
+; ---------------------------------------------------------------------------
+; SPI RAM
+
+.equ RAMCS_DDR         = DDRB
+.equ RAMCS_INPUT       = PINB
+.equ RAMCS_OUTPUT      = PORTB
+.equ RAMCS_PIN         = PORTB0
+
+
+
+; ---------------------------------------------------------------------------
+; SPI EEPROM
+
+
+.equ EEPROMCS_DDR      = DDRB
+.equ EEPROMCS_INPUT    = PINB
+.equ EEPROMCS_OUTPUT   = PORTB
+.equ EEPROMCS_PIN      = PORTB1
+
+
+
diff --git a/avr/devices/e05/main/main.asm b/avr/devices/e05/main/main.asm
index c420ead..bd224e8 100644
--- a/avr/devices/e05/main/main.asm
+++ b/avr/devices/e05/main/main.asm
@@ -62,6 +62,9 @@
 #define MODULES_LED1
 #define MODULES_NETWORK
 #define MODULES_COM2W
+#define MODULES_SPI_SW
+#define MODULES_RAM_23LC512
+#define MODULES_EE_25LC256
 ;#define MODULES_TWI_MASTER
 ;#define MODULES_LCD
 ;#define LCD_MINIMAL_FONT
@@ -132,6 +135,14 @@ firmwareStart:
 ; @routine onSystemStart
 
 onSystemStart:
+  ; external SRAM check
+  bigcall RAM_23LC512_WritePattern
+  nop
+  bigcall RAM_23LC512_ReadPattern
+  brcs onSystemStart_done
+  bigcall DEBUG1
+
+onSystemStart_done:
   ret
 ; @end
 
@@ -183,7 +194,7 @@ onEveryLoop:
 .include "devices/all/hw_tn84.asm"
 .include "devices/all/includes.asm"
 
-;.include "common/debug.asm"
+.include "common/debug.asm"
 ;.include "modules/network/msg/debug-w.asm"
 
 
@@ -201,3 +212,4 @@ deviceCodeEnd:
     .warning "Code reaches into boot loader!"
   .endif
 
+