lay groundwork for a possible future architecture (#1571)

* lay groundwork for a possible future architecture

* switch from feature opt-out to feature opt-in

* lay groundwork for a possible future architecture

* switch from feature opt-out to feature opt-in

* fix USE_RTC in variant.h for rak4631_epaper and t-echo

* ensure Screen.h is not included without configuration.h

Co-authored-by: Peter Lawrence <12226419+majbthrd@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/nrf52/architecture.h

@@ -0,0 +1,91 @@
+#pragma once
+
+#define ARCH_NRF52
+
+//
+// defaults for NRF52 architecture
+//
+
+#ifndef HAS_SCREEN
+    #define HAS_SCREEN 1
+#endif
+#ifndef HAS_WIRE
+    #define HAS_WIRE 1
+#endif
+#ifndef HAS_GPS
+    #define HAS_GPS 1
+#endif
+#ifndef HAS_BUTTON
+    #define HAS_BUTTON 1
+#endif
+#ifndef HAS_TELEMETRY
+    #define HAS_TELEMETRY 1
+#endif
+#ifndef HAS_RADIO
+    #define HAS_RADIO 1
+#endif
+
+//
+// set HW_VENDOR
+//
+
+// This string must exactly match the case used in release file names or the android updater won't work
+#ifdef ARDUINO_NRF52840_PCA10056
+    #define HW_VENDOR HardwareModel_NRF52840DK
+#elif defined(ARDUINO_NRF52840_PPR)
+    #define HW_VENDOR HardwareModel_PPR
+#elif defined(RAK4630)
+    #define HW_VENDOR HardwareModel_RAK4631
+#elif defined(TTGO_T_ECHO)
+    #define HW_VENDOR HardwareModel_T_ECHO
+#elif defined(NORDIC_PCA10059)
+    #define HW_VENDOR HardwareModel_NRF52840_PCA10059
+#else
+    #define HW_VENDOR HardwareModel_NRF52_UNKNOWN
+#endif
+
+//
+// Standard definitions for NRF52 targets
+//
+
+#ifdef ARDUINO_NRF52840_PCA10056
+
+// This board uses 0 to be mean LED on
+#undef LED_INVERTED
+#define LED_INVERTED 1
+
+#endif
+
+#ifndef TTGO_T_ECHO
+#define GPS_UBLOX
+#endif
+
+#define LED_PIN PIN_LED1 // LED1 on nrf52840-DK
+
+#ifdef PIN_BUTTON1
+#define BUTTON_PIN PIN_BUTTON1
+#endif
+
+#ifdef PIN_BUTTON2
+#define BUTTON_PIN_ALT PIN_BUTTON2
+#endif
+
+#ifdef PIN_BUTTON_TOUCH
+#define BUTTON_PIN_TOUCH PIN_BUTTON_TOUCH
+#endif
+
+// Always include the SEGGER code on NRF52 - because useful for debugging
+#include "SEGGER_RTT.h"
+
+// The channel we send stdout data to
+#define SEGGER_STDOUT_CH 0
+
+// Debug printing to segger console
+#define SEGGER_MSG(...) SEGGER_RTT_printf(SEGGER_STDOUT_CH, __VA_ARGS__)
+
+// If we are not on a NRF52840 (which has built in USB-ACM serial support) and we don't have serial pins hooked up, then we MUST
+// use SEGGER for debug output
+#if !defined(PIN_SERIAL_RX) && !defined(NRF52840_XXAA)
+// No serial ports on this board - ONLY use segger in memory console
+#define USE_SEGGER
+#endif

src/nrf52/main-nrf52.cpp

@@ -161,7 +161,7 @@ void cpuDeepSleep(uint64_t msecToWake)
 {
     // FIXME, configure RTC or button press to wake us
     // FIXME, power down SPI, I2C, RAMs
-#ifndef NO_WIRE
+#if HAS_WIRE
     Wire.end();
 #endif
     SPI.end();