Use I2C FRAM module if available to store page voltage state

lib/obp60task/OBP60Extensions.cpp

@@ -61,6 +61,10 @@ GxEPD2_BW<GxEPD2_420_SE0420NQ04, GxEPD2_420_SE0420NQ04::HEIGHT> & getdisplay(){r
 // Horter I2C moduls
 PCF8574 pcf8574_Out(PCF8574_I2C_ADDR1); // First digital output modul PCF8574 from Horter
 
+// FRAM
+Adafruit_FRAM_I2C fram;
+bool hasFRAM = false;
+
 // Global vars
 bool blinkingLED = false;       // Enable / disable blinking flash LED
 bool statusLED = false;         // Actual status of flash LED on/off
@@ -70,7 +74,7 @@ int uvDuration = 0;             // Under voltage duration in n x 100ms
 
 LedTaskData *ledTaskData=nullptr;
 
-void hardwareInit()
+void hardwareInit(GwApi *api)
 {
     Wire.begin();
     // Init PCF8574 digital outputs
@@ -78,7 +82,27 @@ void hardwareInit()
     if(pcf8574_Out.begin()){        // Initialize PCF8574
         pcf8574_Out.write8(255);    // Clear all outputs
     }
-
+    fram = Adafruit_FRAM_I2C();
+    if (esp_reset_reason() ==  ESP_RST_POWERON) {
+        // help initialize FRAM
+        api->getLogger()->logDebug(GwLog::LOG,"Delaying I2C init for 250ms due to cold boot");
+        delay(250);
+    }
+    // FRAM (e.g. MB85RC256V)
+    if (fram.begin(FRAM_I2C_ADDR)) {
+        hasFRAM = true;
+        uint16_t manufacturerID;
+        uint16_t productID;
+        fram.getDeviceID(&manufacturerID, &productID);
+        // Boot counter
+        uint8_t framcounter = fram.read(0x0000);
+        fram.write(0x0000, framcounter+1);
+        api->getLogger()->logDebug(GwLog::LOG,"FRAM detected: 0x%04x/0x%04x (counter=%d)", manufacturerID, productID, framcounter);
+    }
+    else {
+        hasFRAM = false;
+        api->getLogger()->logDebug(GwLog::LOG,"NO FRAM detected");
+    }
 }
 
 void startLedTask(GwApi *api){

lib/obp60task/OBP60Extensions.h

@@ -8,6 +8,19 @@
 #define FASTLED_ESP32_FLASH_LOCK 1
 #include "LedSpiTask.h"
 #include <GxEPD2_BW.h>                  // E-paper lib V2
+#include <Adafruit_FRAM_I2C.h>          // I2C FRAM
+
+// FRAM address reservations 32kB: 0x0000 - 0x7FFF
+// 0x0000 - 0x03ff: single variables
+#define FRAM_VOLTAGE_AVG 0x000A
+#define FRAM_VOLTAGE_TREND 0x000B
+#define FRAM_VOLTAGE_MODE 0x000C
+// Barograph history data
+#define FRAM_BAROGRAPH_START 0x0400
+#define FRAM_BAROGRAPH_END 0x13FF
+
+extern Adafruit_FRAM_I2C fram;
+extern bool hasFRAM;
 
 // Fonts declarations for display (#inclues see OBP60Extensions.cpp)
 extern const GFXfont Ubuntu_Bold8pt7b;
@@ -47,7 +60,7 @@ Point rotatePoint(const Point& origin, const Point& p, double angle);
 std::vector<Point> rotatePoints(const Point& origin, const std::vector<Point>& pts, double angle);
 void fillPoly4(const std::vector<Point>& p4, uint16_t color);
 
-void hardwareInit();
+void hardwareInit(GwApi *api);
 
 void setPortPin(uint pin, bool value);          // Set port pin for extension port
 
@@ -83,4 +96,11 @@ void startLedTask(GwApi *api);
 
 void doImageRequest(GwApi *api, int *pageno, const PageStruct pages[MAX_PAGE_NUMBER], AsyncWebServerRequest *request);
 
+#define fram_width 16
+#define fram_height 16
+static unsigned char fram_bits[] PROGMEM = {
+   0xf8, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x1f, 0xf8, 0x1f, 0xff, 0xff,
+   0xff, 0xff, 0xf8, 0x1f, 0xf8, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x1f,
+   0xf8, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x1f };
+
 #endif

lib/obp60task/OBP60Hardware.h

@@ -30,6 +30,8 @@
     #define INA226_I2C_ADDR3 0x45   // Addr. 0x45 (fix A0 = 5V, A1 = 5V) for generator
     // Horter modules
     #define PCF8574_I2C_ADDR1 0x20  // First digital out module
+    // FRAM (e.g. MB85RC256V)
+    #define FRAM_I2C_ADDR 0x50
     // SPI (E-Ink display, Extern Bus)
     #define OBP_SPI_CS 39
     #define OBP_SPI_DC 40

lib/obp60task/PageVoltage.cpp

@@ -8,20 +8,26 @@ class PageVoltage : public Page
 {
 bool init = false;                  // Marker for init done
 bool keylock = false;               // Keylock
-int average = 0;                    // Average type [0...3], 0=off, 1=10s, 2=60s, 3=300s
+uint8_t average = 0;                // Average type [0...3], 0=off, 1=10s, 2=60s, 3=300s
 bool trend = true;                  // Trend indicator [0|1], 0=off, 1=on
 double raw = 0;
 char mode = 'D';                    // display mode (A)nalog | (D)igital
 
 public:
     PageVoltage(CommonData &common){
-        common.logger->logDebug(GwLog::LOG,"Show PageVoltage");
+        common.logger->logDebug(GwLog::LOG,"Instantiate PageVoltage");
+        if (hasFRAM) {
+            average = fram.read(FRAM_VOLTAGE_AVG);
+            trend = fram.read(FRAM_VOLTAGE_TREND);
+            mode = fram.read(FRAM_VOLTAGE_MODE);
+        }
     }
     virtual int handleKey(int key){
          // Change average
         if(key == 1){
             average ++;
             average = average % 4;      // Modulo 4
+            if (hasFRAM) fram.write(FRAM_VOLTAGE_AVG, average);
             return 0;                   // Commit the key
         }
 
@@ -32,12 +38,14 @@ public:
             } else {
                 mode = 'A';
             }
+            if (hasFRAM) fram.write(FRAM_VOLTAGE_MODE, mode);
             return 0;
         }
 
         // Trend indicator
         if(key == 5){
             trend = !trend;
+            if (hasFRAM) fram.write(FRAM_VOLTAGE_TREND, trend);
             return 0;                   // Commit the key
         }
 
@@ -335,7 +343,7 @@ public:
             // Symbol
             printVoltageSymbol(40, 60, commonData.fgcolor);
 
-            // Additional informatio at right side
+            // Additional information at right side
             getdisplay().setFont(&Ubuntu_Bold8pt7b);
             getdisplay().setCursor(300, 60);
             getdisplay().print("Source:");
@@ -351,6 +359,11 @@ public:
             getdisplay().print("Avg:");
             printAvg(average, 300, 180, false);
 
+            // FRAM indicator
+            if (hasFRAM) {
+                getdisplay().drawXBitmap(300, 240, fram_bits, fram_width, fram_height, commonData.fgcolor);
+            }
+
         }
 
         // Key Layout

lib/obp60task/obp60task.cpp

@@ -43,7 +43,7 @@ void OBP60Init(GwApi *api){
     
 
     // Init hardware
-    hardwareInit();
+    hardwareInit(api);
 
     // Init power rail 5.0V
     String powermode = api->getConfig()->getConfigItem(api->getConfig()->powerMode,true)->asString();

lib/obp60task/platformio.ini

@@ -35,6 +35,7 @@ lib_deps =
     paulstoffregen/OneWire@2.3.8
     milesburton/DallasTemperature@3.11.0
     signetica/SunRise@2.0.2
+    adafruit/Adafruit FRAM I2C@^2.0.3
 build_flags=
     #https://thingpulse.com/usb-settings-for-logging-with-the-esp32-s3-in-platformio/?srsltid=AfmBOopGskbkr4GoeVkNlFaZXe_zXkLceKF6Rn-tmoXABCeAR2vWsdHL
 #    -D ARDUINO_USB_MODE=1           #0=OTG (to implement other external devices), 1=CDC (is a serial device)