sdcard support (experimental)

src/hal/generic.h

@@ -18,6 +18,14 @@
 #define SPI_SCLK GPIO_NUM_18
 #define SPI_CS   GPIO_NUM_5
 
+// enable only if you want to store a local paxcount table on the device
+#define HAS_SDCARD  1      // this board has an SD-card-reader/writer
+// Pins for SD-card
+#define SDCARD_CS    (13)
+#define SDCARD_MOSI  (15)
+#define SDCARD_MISO  (2)
+#define SDCARD_SCLK  (14)
+
 // enable only if device has these sensors, otherwise comment these lines
 // tutorial to connect BME sensor see here:
 // https://sbamueller.wordpress.com/2019/02/26/paxcounter-mit-umweltsensor/

src/hal/ttgov1.h

@@ -18,6 +18,14 @@
 #define LED_ACTIVE_LOW 1  // Onboard LED is active when pin is LOW
 #define HAS_BUTTON KEY_BUILTIN
 
+// enable only if you want to store a local paxcount table on the device
+#define HAS_SDCARD  1      // this board has an SD-card-reader/writer
+// Pins for SD-card
+#define SDCARD_CS    (13)
+#define SDCARD_MOSI  (15)
+#define SDCARD_MISO  (2)
+#define SDCARD_SCLK  (14)
+
 // Pins for I2C interface of OLED Display
 #define MY_OLED_SDA (4)
 #define MY_OLED_SCL (15)

src/hal/ttgov2.h

@@ -19,6 +19,14 @@
 // disable brownout detection (needed on TTGOv2 for battery powered operation)
 #define DISABLE_BROWNOUT 1 // comment out if you want to keep brownout feature
 
+// enable only if you want to store a local paxcount table on the device
+#define HAS_SDCARD  1      // this board has an SD-card-reader/writer
+// Pins for SD-card
+#define SDCARD_CS    (13)
+#define SDCARD_MOSI  (15)
+#define SDCARD_MISO  (2)
+#define SDCARD_SCLK  (14)
+
 // Pins for I2C interface of OLED Display
 #define MY_OLED_SDA (21)
 #define MY_OLED_SCL (22)

src/hal/ttgov21new.h

@@ -15,6 +15,14 @@
 #define HAS_LORA 1       // comment out if device shall not send data via LoRa
 #define CFG_sx1276_radio 1 // HPD13A LoRa SoC
 
+// enable only if you want to store a local paxcount table on the device
+#define HAS_SDCARD  1      // this board has an SD-card-reader/writer
+// Pins for SD-card
+#define SDCARD_CS    (13)
+#define SDCARD_MOSI  (15)
+#define SDCARD_MISO  (2)
+#define SDCARD_SCLK  (14)
+
 // enable only if device has these sensors, otherwise comment these lines
 // BME280 sensor on I2C bus
 //#define HAS_BME 1 // Enable BME sensors in general

src/hal/ttgov21old.h

@@ -19,6 +19,14 @@
 #define HAS_LED NOT_A_PIN // no usable LED on board
 #define DISABLE_BROWNOUT 1 // comment out if you want to keep brownout feature
 
+// enable only if you want to store a local paxcount table on the device
+#define HAS_SDCARD  1      // this board has an SD-card-reader/writer
+// Pins for SD-card
+#define SDCARD_CS    (13)
+#define SDCARD_MOSI  (15)
+#define SDCARD_MISO  (2)
+#define SDCARD_SCLK  (14)
+
 #define HAS_DISPLAY 1
 #define DISPLAY_FLIP  1 // rotated display
 //#define BAT_MEASURE_ADC ADC1_GPIO35_CHANNEL // battery probe GPIO pin -> ADC1_CHANNEL_7

src/main.cpp

@@ -323,6 +323,11 @@ void setup() {
   assert(spi_init() == ESP_OK);
 #endif
 
+#if (HAS_SDCARD)
+  if ( sdcardInit() )
+      strcat_P(features, " SD");
+#endif
+
 #if (VENDORFILTER)
   strcat_P(features, " FILTER");
 #endif

src/sdcard.cpp

@@ -0,0 +1,67 @@
+// routines for writing data to an SD-card, if present
+
+// Local logging tag
+static const char TAG[] = __FILE__;
+
+#include "sdcard.h"
+
+static bool useSDCard;
+
+static void createFile(void);
+
+File fileSDCard;
+
+bool sdcardInit() {
+  ESP_LOGD(TAG, "looking for SD-card...");
+  useSDCard = SD.begin(SDCARD_CS, SDCARD_MOSI, SDCARD_MISO, SDCARD_SCLK);
+  if (useSDCard)
+    createFile();
+  return useSDCard;
+}
+
+void sdcardWriteData(uint16_t noWifi, uint16_t noBle) {
+  static int counterWrites = 0;
+  char tempBuffer[12 + 1];
+  time_t t = now();
+
+  if (!useSDCard)
+    return;
+
+  ESP_LOGD(TAG, "writing to SD-card");
+  sprintf(tempBuffer, "%02d.%02d.%4d,", day(t), month(t), year(t));
+  fileSDCard.print(tempBuffer);
+  sprintf(tempBuffer, "%02d:%02d:%02d,", hour(t), minute(t), second(t));
+  fileSDCard.print(tempBuffer);
+  sprintf(tempBuffer, "%d,%d", noWifi, noBle);
+  fileSDCard.println(tempBuffer);
+
+  if (++counterWrites > 2) {
+    // force writing to SD-card
+    ESP_LOGD(TAG, "flushing data to card");
+    fileSDCard.flush();
+    counterWrites = 0;
+  }
+}
+
+void createFile(void) {
+  char bufferFilename[8 + 1 + 3 + 1];
+
+  useSDCard = false;
+
+  for (int i = 0; i < 100; i++) {
+    sprintf(bufferFilename, SDCARD_FILE_NAME, i);
+    ESP_LOGD(TAG, "SD: looking for file <%s>", bufferFilename);
+    bool fileExists = SD.exists(bufferFilename);
+    if (!fileExists) {
+      ESP_LOGD(TAG, "SD: file does not exist: opening");
+      fileSDCard = SD.open(bufferFilename, FILE_WRITE);
+      if (fileSDCard) {
+        ESP_LOGD(TAG, "SD: name opended: <%s>", bufferFilename);
+        fileSDCard.println(SDCARD_FILE_HEADER);
+        useSDCard = true;
+        break;
+      }
+    }
+  }
+  return;
+}

src/senddata.cpp

@@ -51,6 +51,11 @@ void SendPayload(uint8_t port, sendprio_t prio) {
   spi_enqueuedata(&SendBuffer);
 #endif
 
+// write data to sdcard, if present
+#ifdef HAS_SDCARD
+  sdcardWriteData(macs_wifi, macs_ble);
+#endif
+
 } // SendPayload
 
 // interrupt triggered function to prepare payload to send
@@ -72,7 +77,7 @@ void sendData() {
       if (cfg.blescan)
         payload.addCount(macs_ble, MAC_SNIFF_BLE);
 #endif
-#if (HAS_GPS) 
+#if (HAS_GPS)
       if (GPSPORT == COUNTERPORT) {
         // send GPS position only if we have a fix
         if (gps.location.isValid()) {
@@ -82,7 +87,7 @@ void sendData() {
           ESP_LOGD(TAG, "No valid GPS position");
       }
 #endif
-#if (PAYLOAD_OPENSENSEBOX)      
+#if (PAYLOAD_OPENSENSEBOX)
       if (cfg.wifiscan)
         payload.addCount(macs_wifi, MAC_SNIFF_WIFI);
       if (cfg.blescan)
@@ -110,7 +115,7 @@ void sendData() {
       break;
 #endif
 
-#if (HAS_GPS) 
+#if (HAS_GPS)
     case GPS_DATA:
       if (GPSPORT != COUNTERPORT) {
         // send GPS position only if we have a fix