(3/3) Add variant for pico with waveshare and GPS hat (#3412)

* (3/3) Add variant for pico with waveshare and GPS hat, utilizing slow clock.

* Not everybody has Serial2

* Trunk

* Push it real gud

* No init

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

variants/rpipico-slowclock/platformio.ini

@@ -0,0 +1,28 @@
+[env:pico_slowclock]
+extends = rp2040_base
+board = rpipico
+upload_protocol = jlink
+# debug settings for external openocd with RP2040 support (custom build)
+debug_tool = custom
+debug_init_cmds =
+  target extended-remote localhost:3333
+  $INIT_BREAK
+  monitor reset halt
+  $LOAD_CMDS
+  monitor init
+  monitor reset halt
+
+# add our variants files to the include and src paths
+build_flags = ${rp2040_base.build_flags} 
+  -DRPI_PICO
+  -Ivariants/rpipico_slowclock
+  -DDEBUG_RP2040_PORT=Serial2
+  -DHW_SPI1_DEVICE
+  -L "${platformio.libdeps_dir}/${this.__env__}/BSEC2 Software Library/src/cortex-m0plus"
+  -g
+  -DNO_USB
+lib_deps =
+  ${rp2040_base.lib_deps}
+debug_build_flags = ${rp2040_base.build_flags}
+  -g
+  -DNO_USB

variants/rpipico-slowclock/variant.h

@@ -0,0 +1,87 @@
+#define ARDUINO_ARCH_AVR
+
+// Build with slow system clock enabled to reduce power consumption.
+#define RP2040_SLOW_CLOCK
+
+#ifdef RP2040_SLOW_CLOCK
+// Redefine UART1 serial log output to avoid collision with UART0 for GPS.
+#define SERIAL2_TX 4
+#define SERIAL2_RX 5
+// Reroute log output in SensorLib when USB is not available
+#define log_e(...) Serial2.printf(__VA_ARGS__)
+#define log_i(...) Serial2.printf(__VA_ARGS__)
+#define log_d(...) Serial2.printf(__VA_ARGS__)
+#endif
+
+// Expecting the Waveshare Pico GPS hat
+#define HAS_GPS 1
+
+// Enable OLED Screen
+#define HAS_SCREEN 1
+#define USE_SH1106 1
+#define RESET_OLED 13
+
+// Redefine I2C0 pins to avoid collision with UART1/Serial2.
+#define I2C_SDA 8
+#define I2C_SCL 9
+
+// Redefine Waveshare UPS-A/B I2C_1 pins:
+#define I2C_SDA1 6
+#define I2C_SCL1 7
+// Waveshare UPS-A/B uses a 0.01 Ohm shunt for the INA219 sensor
+#define INA219_MULTIPLIER 10.0f
+
+// Waveshare Pico GPS L76B pins:
+#define GPS_RX_PIN 1
+#define GPS_TX_PIN 0
+
+// Wakeup from backup mode
+// #define PIN_GPS_FORCE_ON 14
+// No GPS reset available
+#undef PIN_GPS_RESET
+/*
+ * For PPS output the resistor R20 needs to be populated with 0 Ohm
+ * on the Waveshare Pico GPS board.
+ */
+#define PIN_GPS_PPS 16
+/*
+ * For standby mode switching the resistor R18 needs to be populated
+ * with 0 Ohm on the Waveshare Pico GPS board.
+ */
+#define PIN_GPS_STANDBY 17
+
+#define BUTTON_PIN 18
+#define EXT_NOTIFY_OUT 22
+#define LED_PIN PIN_LED
+
+#define BATTERY_PIN 26
+// ratio of voltage divider = 3.0 (R17=200k, R18=100k)
+#define ADC_MULTIPLIER 3.1 // 3.0 + a bit for being optimistic
+#define BATTERY_SENSE_RESOLUTION_BITS ADC_RESOLUTION
+
+#define USE_SX1262
+
+#undef LORA_SCK
+#undef LORA_MISO
+#undef LORA_MOSI
+#undef LORA_CS
+
+#define LORA_SCK 10
+#define LORA_MISO 12
+#define LORA_MOSI 11
+#define LORA_CS 3
+
+#define LORA_DIO0 RADIOLIB_NC
+#define LORA_RESET 15
+#define LORA_DIO1 20
+#define LORA_DIO2 2
+#define LORA_DIO3 RADIOLIB_NC
+
+#ifdef USE_SX1262
+#define SX126X_CS LORA_CS
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#endif