WIP: unify the RAK targets into one firmware (#1350)

* First steps to unify GPS Lib for RAK 1910 and RAK 12500

* Technicalities. Out with the old and build the new.

* Adapt Matrix

* We use 0.4.5 now

* While we're at it, yank the RAK815, it's EOL

* Satisfy CI - for now

* - yank UBX library, talk to GPS chip with NMEA only.
- more autodetect going on, this time for the Eink Display.

TODO: actually do something with the scan findings.

* i swear this works on windows! :-)

* these are only there to make CI happy

* don't update eink display if not detected.

* Replace Oberon Crypt Library with modified Adafruit Library. This elimintaes the need for the sdk-nfxlib submodule.

* - Revert auto screen selection (incomplete)
- Revert nrF crypto engine (needs more work)
- add separate defines for not-auto-selecting screen lib.

* Define 2 new variants for RAK - with or without epaper

* Update variants

Co-authored-by: Sacha Weatherstone <sachaw100@hotmail.com>
Co-authored-by: Ben Meadors <thebentern@tuta.io>

src/debug/einkScan.h

@@ -0,0 +1,60 @@
+#include "../configuration.h"
+
+#ifdef RAK4630
+#include "../main.h"
+#include <SPI.h>
+
+void d_writeCommand(uint8_t c)
+{
+  SPI1.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
+  if (PIN_EINK_DC >= 0) digitalWrite(PIN_EINK_DC, LOW);
+  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, LOW);
+  SPI1.transfer(c);
+  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, HIGH);
+  if (PIN_EINK_DC >= 0) digitalWrite(PIN_EINK_DC, HIGH);
+  SPI1.endTransaction();
+}
+
+void d_writeData(uint8_t d)
+{
+  SPI1.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
+  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, LOW);
+  SPI1.transfer(d);
+  if (PIN_EINK_CS >= 0) digitalWrite(PIN_EINK_CS, HIGH);
+  SPI1.endTransaction();
+}
+
+unsigned long d_waitWhileBusy(uint16_t busy_time)
+{
+  if (PIN_EINK_BUSY >= 0)
+  {
+    delay(1); // add some margin to become active
+    unsigned long start = micros();
+    while (1)
+    {
+      if (digitalRead(PIN_EINK_BUSY) != HIGH) break;
+      delay(1);
+      if (digitalRead(PIN_EINK_BUSY) != HIGH) break;
+      if (micros() - start > 10000000) break;
+    }
+    unsigned long elapsed = micros() - start;
+    (void) start;
+    return elapsed;
+  }
+  else return busy_time;
+}
+
+void scanEInkDevice(void)
+{
+    SPI1.begin();
+    d_writeCommand(0x22);
+    d_writeData(0x83);
+    d_writeCommand(0x20);
+    eink_found = (d_waitWhileBusy(150) > 0) ? true : false;
+    if(eink_found)
+       DEBUG_MSG("EInk display found\n");
+    else
+       DEBUG_MSG("EInk display not found\n");
+    SPI1.end();
+}
+#endif

src/debug/i2cScan.h

@@ -54,6 +54,7 @@ void scanI2Cdevice(void)
                     DEBUG_MSG("unknown display found\n");
                 }
             }
+
             if (addr == CARDKB_ADDR) {
                 cardkb_found = addr;
                 DEBUG_MSG("m5 cardKB found\n");