From 8fcd880a4ad5c2b59b3567abb7369153a1faceb8 Mon Sep 17 00:00:00 2001
From: Manfred Steiner <sx@htl-kaindorf.at>
Date: Wed, 11 Sep 2024 09:52:25 +0200
Subject: [PATCH] software/nano-1284/test_2024-07-23 (detect hardware version)

---
 .../nano-644/test_2024-07-23/src/main.cpp     | 30 +++++++++++++++++++
 .../nano-644/test_2024-07-23/src/main.hpp     |  2 ++
 2 files changed, 32 insertions(+)

diff --git a/software/nano-644/test_2024-07-23/src/main.cpp b/software/nano-644/test_2024-07-23/src/main.cpp
index 2971b6e..00a2df7 100644
--- a/software/nano-644/test_2024-07-23/src/main.cpp
+++ b/software/nano-644/test_2024-07-23/src/main.cpp
@@ -42,6 +42,8 @@ const char PSTR_LINEFEED[] PROGMEM = "\n";
 const char PSTR_ERROR[] PROGMEM = "ERROR";
 const char PSTR_Done[] PROGMEM = "Done";
 
+uint8_t hardwareVersion = 0;
+
 extern "C" {
    void __cxa_pure_virtual () {}
    int  __cxa_guard_acquire(uint8_t *g) { return 0; }
@@ -145,6 +147,25 @@ extern "C" {
    Cc1101 cc1101Receive(Cc1101::Receive);
 }
 
+uint8_t detectHardwareVersion () {
+   ADMUX = (1 << ADLAR) | (1 << REFS0) | 7; // ADC7, VREF=AVCC=3.3V
+   ADCSRA = (1 << ADEN) | 7; // ADC Enable, Prescaler 128
+   ADCSRA |= (1 << ADSC); // start ADC
+   while (ADCSRA & (1 << ADSC)) {} // wait for result
+   hardwareVersion = 0; // unknown board version
+   // printf("Hardware-Version: ADC7H = %d\n", ADCH);
+   if (ADCH >= 0xf0) {
+      hardwareVersion = 1;
+   } else if (ADCH >= 0xe0) {
+      hardwareVersion = 2;
+   } else {
+      printf("Invalid Hardware-Version: ADC7H = %d\n", ADCH);
+   }
+   ADMUX = 0;
+   ADCSRA = 0;
+   return hardwareVersion;
+}
+
 void setTimer (uint32_t ms) {
    ATOMIC_BLOCK(ATOMIC_FORCEON) {
       timer1ms = ms;
@@ -216,6 +237,8 @@ int main () {
       };
    #endif
 
+   detectHardwareVersion();
+
    while (1) {
       uint16_t i;
       char s[4];
@@ -226,6 +249,13 @@ int main () {
          printf_P(MAIN_CPP_DATE); printf_P(PSTR(" / "));
          printf_P(MAIN_CPP_TIME);
          printf_P(PSTR_DIVIDER);
+         if (hardwareVersion >= 1 && hardwareVersion <= 2) {
+            printf_P(PSTR("Hardware: %d"), hardwareVersion); 
+         } else {
+            printf_P(PSTR("ERROR: Invalid Hardware (%d)"), hardwareVersion); 
+            for(;;);
+         }
+         printf_P(PSTR_DIVIDER);
          printf_P(PSTR_LINEFEED);
          printf_P(PSTR("Available units:\n\n"));
          for (i = 0; i < sizeof(unit) / sizeof(unit[0]); i++) {
diff --git a/software/nano-644/test_2024-07-23/src/main.hpp b/software/nano-644/test_2024-07-23/src/main.hpp
index a7f2ae8..7eeff16 100644
--- a/software/nano-644/test_2024-07-23/src/main.hpp
+++ b/software/nano-644/test_2024-07-23/src/main.hpp
@@ -12,6 +12,8 @@ extern int wait (uint32_t ms);
 extern int waitAndReadKey (uint32_t ms);
 extern uint64_t millis ();
 
+extern uint8_t hardwareVersion;
+
 extern const char PSTR_DIVIDER[];
 extern const char PSTR_LINEFEED[];
 extern const char PSTR_ERROR[];
-- 
2.39.5