Added support for storing settings in FLASH.

CHANGELOG.md

@@ -0,0 +1,18 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+    Added     : for new features.
+    Changed   : for changes in existing functionality.
+    Deprecated: for soon-to-be removed features.
+    Removed   : for now removed features.
+    Fixed     : for any bug fixes.
+    Security  : in case of vulnerabilities.
+
+## [1.0.0] - pre 2022-05-12
+First (more or less) working version.
+
+## [1.0.1] - 2022-05-12
+
+### Added
+- Support for saving settings to internal FLASH

build/src/CMakeFiles/main.dir/CXX.includecache

@@ -148,6 +148,16 @@ pico.h
 hardware/regs/addressmap.h
 ../pico-sdk/src/rp2_common/hardware_base/include/hardware/hardware/regs/addressmap.h
 
+../pico-sdk/src/rp2_common/hardware_claim/include/hardware/claim.h
+pico.h
+../pico-sdk/src/rp2_common/hardware_claim/include/hardware/pico.h
+hardware/sync.h
+../pico-sdk/src/rp2_common/hardware_claim/include/hardware/hardware/sync.h
+
+../pico-sdk/src/rp2_common/hardware_flash/include/hardware/flash.h
+pico.h
+../pico-sdk/src/rp2_common/hardware_flash/include/hardware/pico.h
+
 ../pico-sdk/src/rp2_common/hardware_gpio/include/hardware/gpio.h
 pico.h
 ../pico-sdk/src/rp2_common/hardware_gpio/include/hardware/pico.h
@@ -166,6 +176,14 @@ hardware/structs/spi.h
 hardware/regs/dreq.h
 ../pico-sdk/src/rp2_common/hardware_spi/include/hardware/hardware/regs/dreq.h
 
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/sync.h
+pico.h
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/pico.h
+hardware/address_mapped.h
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/hardware/address_mapped.h
+hardware/regs/sio.h
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/hardware/regs/sio.h
+
 ../pico-sdk/src/rp2_common/hardware_timer/include/hardware/timer.h
 pico.h
 ../pico-sdk/src/rp2_common/hardware_timer/include/hardware/pico.h
@@ -237,12 +255,16 @@ pico/stdlib.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/pico/stdlib.h
 pico/binary_info.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/pico/binary_info.h
+hardware/flash.h
+/home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/hardware/flash.h
 LoRa-RP2040.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/LoRa-RP2040.h
 Config.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/Config.h
 KISS.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/KISS.h
+hardware/claim.h
+/home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/hardware/claim.h
 
 generated/pico_base/pico/config_autogen.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/pico-sdk/src/boards/include/boards/pico.h

build/src/CMakeFiles/main.dir/depend.internal

@@ -2162,8 +2162,11 @@ src/CMakeFiles/main.dir/main.cpp.obj
  ../pico-sdk/src/rp2040/hardware_structs/include/hardware/structs/timer.h
  ../pico-sdk/src/rp2040/hardware_structs/include/hardware/structs/uart.h
  ../pico-sdk/src/rp2_common/hardware_base/include/hardware/address_mapped.h
+ ../pico-sdk/src/rp2_common/hardware_claim/include/hardware/claim.h
+ ../pico-sdk/src/rp2_common/hardware_flash/include/hardware/flash.h
  ../pico-sdk/src/rp2_common/hardware_gpio/include/hardware/gpio.h
  ../pico-sdk/src/rp2_common/hardware_spi/include/hardware/spi.h
+ ../pico-sdk/src/rp2_common/hardware_sync/include/hardware/sync.h
  ../pico-sdk/src/rp2_common/hardware_timer/include/hardware/timer.h
  ../pico-sdk/src/rp2_common/hardware_uart/include/hardware/uart.h
  ../pico-sdk/src/rp2_common/pico_platform/include/pico/platform.h

build/src/CMakeFiles/main.dir/depend.make

@@ -2161,8 +2161,11 @@ src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2040/hardware_structs/in
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2040/hardware_structs/include/hardware/structs/timer.h
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2040/hardware_structs/include/hardware/structs/uart.h
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_base/include/hardware/address_mapped.h
+src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_claim/include/hardware/claim.h
+src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_flash/include/hardware/flash.h
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_gpio/include/hardware/gpio.h
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_spi/include/hardware/spi.h
+src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_sync/include/hardware/sync.h
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_timer/include/hardware/timer.h
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/hardware_uart/include/hardware/uart.h
 src/CMakeFiles/main.dir/main.cpp.obj: ../pico-sdk/src/rp2_common/pico_platform/include/pico/platform.h

src/Config.h

@@ -60,14 +60,18 @@
   const uint8_t SIG_SYNCED = 0x02;
   const uint8_t RX_ONGOING = 0x04;
   
+  // The size of this struc should be a exactly 256 bytes, which is the FLASH_PAGE_SIZE of the RPi pico's flash memory
   struct aprssettings {
-      uint8_t MyCall[10] = { 'P','E','1','R','X','F','-','5', 0} ;
+      uint8_t ValidFlashData = 0x5A;  // Indicates flash contains valid data - 1 bytes
-      uint8_t ServerCall[10] = { 'P','E','1','R','X','F','-','3', 0} ;
+      uint8_t MyCall[10] = { 'N','O','C','A','L','L','-','2', 0} ;      // 10 bytes
-      uint8_t Destination[10] = { 'A','P','Z','M','D','M', 0} ;
+      uint8_t ServerCall[10] = { 'N','O','C','A','L','L','-','1', 0} ;  // 10 bytes
-      uint8_t Path1[10] = { 0,'I','D','E','1','-', '1', 0} ;
+      uint8_t Destination[10] = { 'A','P','Z','M','D','M', 0} ;         // 10 bytes
-      uint8_t Path2[10] = { 0,'I','D','E','2','-', '2', 0} ; 
+      uint8_t Path1[10] = { 0,'I','D','E','1','-', '1', 0} ;            // 10 bytes
+      uint8_t Path2[10] = { 0,'I','D','E','2','-', '2', 0} ;            // 10 bytes
             
-      uint8_t FirmwareVersion[20] = { 'V','1',',','C','o','n','t','r', 'o','l','l','e','r',' ','0','1', 0} ;
+      uint8_t FirmwareVersion[20] = { 'V','1',',','C','o','n','t','r', 'o','l','l','e','r',' ','0','1', 0} ;    // 20 bytes
+                                                                        // 71 bytes total
+      uint8_t FillerData[256-71];
   } AprsSettings;
   
   struct status {

src/main.cpp

@@ -3,12 +3,13 @@
 #include <time.h>
 #include "pico/stdlib.h"
 #include "pico/binary_info.h"
+#include "hardware/flash.h"
 #include "LoRa-RP2040.h"
 #include "Config.h"
 #include "KISS.h"
+#include "hardware/claim.h"
 
 bool startRadio();
-bool LoadSettings();
 void getPacketData(int packetLength);
 int compare_strings(uint8_t a[], uint8_t b[]);
 bool is_message_for_me (uint8_t data[], uint8_t mycall[]);
@@ -27,12 +28,47 @@ const uint PowerSupply5VControl  = 4;
 const uint RelayOffControl       = 2;
 const uint RelayOnControl        = 3;
 
-int main() {
+// We're going to use a region 256k from the start of flash as non volatile storage for our settings.
+// We can access this at XIP_BASE + 256k.
+#define FLASH_TARGET_OFFSET (512 * 1024)
 
-    uint16_t ServerCommand = 0;
+const uint8_t *flash_target_contents = (const uint8_t *) (XIP_BASE + FLASH_TARGET_OFFSET);
-    uint16_t TxDelay = 0;
 
-   /* Among others, this initializes the USB-serial port at 115200bps 8N1 */
+uint8_t ReadSettingsFromFlash(void)
+{
+    
+    // If byte zero of flash contains 0x5A we assume the data to be valid, otherwise we fill the flash with default values.
+    if (flash_target_contents[0] != 0x5A)
+    {
+        printf( "No valid data found in FLASH memory.\n" );
+        memset(AprsSettings.FillerData, 0, sizeof(AprsSettings.FillerData));
+        uint32_t ints = save_and_disable_interrupts();
+        
+        // First we erase the FLASH sector we need. After that we can store new values.
+        // Note that a whole number of sectors must be erased at a time.
+        // Sector size is 4kB, so this is way bigger than the needed 256 bytes for storing the settings.
+        printf("Erasing FLASH region...");
+        flash_range_erase(FLASH_TARGET_OFFSET, FLASH_SECTOR_SIZE);
+        printf("done\n");
+        printf("Writing default values to FLASH...");    
+        flash_range_program(FLASH_TARGET_OFFSET, (uint8_t*)&AprsSettings, FLASH_PAGE_SIZE);
+        printf("done\n");
+        restore_interrupts (ints);
+    } else {
+        // Read settings stored in flash memory
+        printf("Found valid settings in FLASH memory.\n");
+    }
+    memcpy((uint8_t*)&AprsSettings, flash_target_contents, FLASH_PAGE_SIZE);
+        
+    printf("APRS settings:\n");
+    printf("My call: %s\n", AprsSettings.MyCall);
+    printf("Server call: %s\n", AprsSettings.ServerCall);
+    printf("Firmware: %s\n",AprsSettings.FirmwareVersion);
+}
+
+void setup(void)
+{
+    /* Among others, this initializes the USB-serial port at 115200bps 8N1 */
    stdio_init_all();
 
    // Buffers
@@ -66,9 +102,17 @@ int main() {
    
    sleep_ms(5000);
    
-   LoadSettings();
+   ReadSettingsFromFlash();
    
    startRadio();
+}
+
+int main() {
+    
+    uint16_t ServerCommand = 0;
+    uint16_t TxDelay = 0;
+  
+   setup();
     
    while (1) {
       int packetSize = LoRa.parsePacket();
@@ -196,16 +240,6 @@ int main() {
   return 0;
 }
 
-/*
- * Load settings from EEPROM
- */
-bool LoadSettings()
-{
-    printf("APRS settings:\n");
-    printf("My call: %s\n", AprsSettings.MyCall);
-    printf("Server call: %s\n", AprsSettings.ServerCall);
-    
-}
 /*
  * Initializes the LoRa module with the parameters set in config.h
  */