Add XIAO nRF52840 + Wio SX1262 DIY Variant (meshtastic#5976)

* added xiao nRF52840 + xiao wio sx1262 DIY variant

* fix path / make buildy buildy

* pcf cruft from personal hw

---------

Co-authored-by: Ben Meadors <[email protected]>

variants/diy/platformio.ini

@@ -70,6 +70,20 @@ lib_deps =
   ${nrf52840_base.lib_deps}
 debug_tool = jlink
 
+; Seeed XIAO nRF52840 + XIAO Wio SX1262 DIY
+[env:seeed-xiao-nrf52840-wio-sx1262]
+board = xiao_ble_sense
+extends = nrf52840_base
+board_level = extra
+build_flags = ${nrf52840_base.build_flags} -Ivariants/diy/seeed-xiao-nrf52840-wio-sx1262 -D PRIVATE_HW
+  -Isrc/platform/nrf52/softdevice -Isrc/platform/nrf52/softdevice/nrf52
+  -L "${platformio.libdeps_dir}/${this.__env__}/bsec2/src/cortex-m4/fpv4-sp-d16-hard"
+board_build.ldscript = src/platform/nrf52/nrf52840_s140_v7.ld
+build_src_filter = ${nrf52_base.build_src_filter} +<../variants/diy/seeed-xiao-nrf52840-wio-sx1262>
+lib_deps =
+  ${nrf52840_base.lib_deps}
+debug_tool = jlink
+
 ; NanoVHF T-Energy-S3 + E22(0)-xxxM - DIY
 [env:t-energy-s3_e22]
 extends = esp32s3_base
@@ -86,4 +100,4 @@ build_flags =
   -D BOARD_HAS_PSRAM
   -D ARDUINO_USB_MODE=0
   -D ARDUINO_USB_CDC_ON_BOOT=1
-  -I variants/diy/t-energy-s3_e22
+  -I variants/diy/t-energy-s3_e22

variants/diy/seeed-xiao-nrf52840-wio-sx1262/README.md

@@ -0,0 +1,43 @@
+# XIAO nRF52840 + XIAO Wio SX1262
+
+For a mere doubling in price you too can swap out the XIAO ESP32C3 for a XIAO nRF52840, stack the Wio SX1262 radio board either above or underneath the nRF52840, solder the pins, and achieve a massive improvement in battery life!
+
+I'm not really sure why else you would want to as the ESP32C3 is perfectly cromulent, easily connects to the Wio SX1262 via the B2B connector and has an onboard IPEX connector for the included Bluetooth antenna. So you'll also lose BT range, but you will also have working ADC for the battery in Meshtastic and also have an ESP32C3 to use for something else!
+
+If you're still reading you are clearly gonna do it anyway, so...mount the Wio SX1262 either on top or underneath depending on your preference. The `variant.h` will work with either configuration though it does map the Wio SX1262's button to nRF52840 Pin `D5` as it can still be used as a user button and it's nice to be able to gracefully shutdown a node by holding it down for 5 seconds.
+
+If you do decide to wire up the button, orient it so looking straight-down at the Wio SX1262 the radio chip is at the bottom, button in the middle and the hole is at the top - the **left** side of the button should be soldered to `GND` (e.g. the 2nd pin down the top on the **right** row of pins) and the **right** side of the button should be soldered to `D5` (e.g. the 2nd pin up from the button on the **left** row of pins.). This mirrors the original wiring and wiring it in reverse could end up connecting GND to voltage and that's no beuno.
+
+Serial Pins remain available on `D6` (TX) and `D7` (RX) should you want to use them, The same pins could be repurposed for `i2c` if you would like to have that instead of serial, in `variant.h` you would just need to change:
+
+```c++
+// RX and TX pins
+#define PIN_SERIAL1_RX (6)
+#define PIN_SERIAL1_TX (7)
+```
+
+to
+
+```c++
+// RX and TX pins
+#define PIN_SERIAL1_RX (-1)
+#define PIN_SERIAL1_TX (-1)
+```
+
+and
+
+```c++
+#define PIN_WIRE_SDA (-1)
+#define PIN_WIRE_SCL (-1)
+// #define PIN_WIRE_SDA (6)
+// #define PIN_WIRE_SCL (7)
+```
+
+to
+
+```c++
+#define PIN_WIRE_SDA (6)
+#define PIN_WIRE_SCL (7)
+```
+
+If you wanted both serial and i2c you could even go so far as to use the pads for the PDM mic which is missing on the non-sense board (`P1.00` / `P0.16`)... or move up to the nRF52840 Plus which has even more pins available but hasn't been checked/confirmed if it follows the same pin mapping as the non-plus.

variants/diy/seeed-xiao-nrf52840-wio-sx1262/variant.cpp

@@ -0,0 +1,55 @@
+#include "variant.h"
+#include "nrf.h"
+#include "wiring_constants.h"
+#include "wiring_digital.h"
+
+const uint32_t g_ADigitalPinMap[] = {
+    // D0 .. D13
+    2,  // D0  is P0.02 (A0)
+    3,  // D1  is P0.03 (A1)
+    28, // D2  is P0.28 (A2)
+    29, // D3  is P0.29 (A3)
+    4,  // D4  is P0.04 (A4,SDA)
+    5,  // D5  is P0.05 (A5,SCL)
+    43, // D6  is P1.11 (TX)
+    44, // D7  is P1.12 (RX)
+    45, // D8  is P1.13 (SCK)
+    46, // D9  is P1.14 (MISO)
+    47, // D10 is P1.15 (MOSI)
+
+    // LEDs
+    26, // D11 is P0.26 (LED RED)
+    6,  // D12 is P0.06 (LED BLUE)
+    30, // D13 is P0.30 (LED GREEN)
+    14, // D14 is P0.14 (READ_BAT)
+
+    // LSM6DS3TR
+    40, // D15 is P1.08 (6D_PWR)
+    27, // D16 is P0.27 (6D_I2C_SCL)
+    7,  // D17 is P0.07 (6D_I2C_SDA)
+    11, // D18 is P0.11 (6D_INT1)
+
+    // MIC
+    42, // 17,//42,  // D19 is P1.10 (MIC_PWR)
+    32, // 26,//32,  // D20 is P1.00 (PDM_CLK)
+    16, // 25,//16,  // D21 is P0.16 (PDM_DATA)
+
+    // BQ25100
+    13, // D22 is P0.13 (HICHG)
+    17, // D23 is P0.17 (~CHG)
+
+    //
+    21, // D24 is P0.21 (QSPI_SCK)
+    25, // D25 is P0.25 (QSPI_CSN)
+    20, // D26 is P0.20 (QSPI_SIO_0 DI)
+    24, // D27 is P0.24 (QSPI_SIO_1 DO)
+    22, // D28 is P0.22 (QSPI_SIO_2 WP)
+    23, // D29 is P0.23 (QSPI_SIO_3 HOLD)
+
+    // NFC
+    9,  // D30 is P0.09 (NFC1)
+    10, // D31 is P0.10 (NFC2)
+
+    // VBAT
+    31, // D32 is P0.10 (VBAT)
+};

variants/diy/seeed-xiao-nrf52840-wio-sx1262/variant.h

@@ -0,0 +1,188 @@
+// basically xiao_ble with pins remapped for:
+// Seeed XIAO nRF52840 : https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html
+// Seeed Wio SX1626 : https://www.seeedstudio.com/Wio-SX1262-with-XIAO-ESP32S3-p-5982.html
+
+#ifndef _SEEED_XIAO_NRF52840_SENSE_H_
+#define _SEEED_XIAO_NRF52840_SENSE_H_
+
+/** Master clock frequency */
+#define VARIANT_MCK (64000000ul)
+
+#define USE_LFXO // Board uses 32khz crystal for LF
+
+/*----------------------------------------------------------------------------
+ *        Headers
+ *----------------------------------------------------------------------------*/
+
+#include "WVariant.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+#define PINS_COUNT (33)
+#define NUM_DIGITAL_PINS (33)
+#define NUM_ANALOG_INPUTS (8) // A6 is used for battery, A7 is analog reference
+#define NUM_ANALOG_OUTPUTS (0)
+
+// LEDs
+// ----
+#define LED_RED 11
+#define LED_BLUE 12
+#define LED_GREEN 13
+
+#define PIN_LED1 LED_GREEN
+#define PIN_LED2 LED_BLUE
+#define PIN_LED3 LED_RED
+
+#define PIN_LED PIN_LED1
+#define LED_PWR (PINS_COUNT)
+
+#define LED_BUILTIN PIN_LED
+#define LED_STATE_ON 1 // State when LED is lit
+
+// XIAO Wio-SX1262 Shield User button
+#define PIN_BUTTON1 5
+#define BUTTON_NEED_PULLUP
+
+// Digital Pins
+// ------------
+#define D0 (0ul)
+#define D1 (1ul)
+#define D2 (2ul)
+#define D3 (3ul)
+#define D4 (4ul)
+#define D5 (5ul)
+#define D6 (6ul)
+#define D7 (7ul)
+#define D8 (8ul)
+#define D9 (9ul)
+#define D10 (10ul)
+
+// Analog Pins
+// -----------
+#define PIN_A0 (0)
+#define PIN_A1 (1)
+#define PIN_A2 (2)
+#define PIN_A3 (3)
+#define PIN_A4 (4)
+#define PIN_A5 (5)
+#define PIN_VBAT (32)
+#define VBAT_ENABLE (14)
+
+static const uint8_t A0 = PIN_A0;
+static const uint8_t A1 = PIN_A1;
+static const uint8_t A2 = PIN_A2;
+static const uint8_t A3 = PIN_A3;
+static const uint8_t A4 = PIN_A4;
+static const uint8_t A5 = PIN_A5;
+#define ADC_RESOLUTION 12
+
+// Other Pins
+// ----------
+#define PIN_NFC1 (30)
+#define PIN_NFC2 (31)
+
+// RX and TX pins
+#define PIN_SERIAL1_RX (6)
+#define PIN_SERIAL1_TX (7)
+// complains if not defined
+#define PIN_SERIAL2_RX (-1)
+#define PIN_SERIAL2_TX (-1)
+
+// 4 is used as RF_SW and 5 for USR button so...
+#define PIN_WIRE_SDA (-1)
+#define PIN_WIRE_SCL (-1)
+// #define PIN_WIRE_SDA (6)
+// #define PIN_WIRE_SCL (7)
+
+static const uint8_t SDA = PIN_WIRE_SDA;
+static const uint8_t SCL = PIN_WIRE_SCL;
+
+// SPI SX1262
+// ----------
+#define SPI_SX1262
+#ifdef SPI_SX1262
+#define SPI_INTERFACES_COUNT 1
+
+#define PIN_SPI_MISO (9)
+#define PIN_SPI_MOSI (10)
+#define PIN_SPI_SCK (8)
+
+static const uint8_t SS = D3;
+static const uint8_t MOSI = PIN_SPI_MOSI;
+static const uint8_t MISO = PIN_SPI_MISO;
+static const uint8_t SCK = PIN_SPI_SCK;
+
+// supported modules list
+#define USE_SX1262
+
+// common pinouts for SX126X modules
+#define SX126X_CS D3
+#define SX126X_DIO1 D0
+#define SX126X_BUSY D1
+#define SX126X_RESET D2
+
+// DIO2 controlls an antenna switch and the TCXO voltage is controlled by DIO3
+#define SX126X_DIO2_AS_RF_SWITCH
+#define SX126X_RXEN 38
+#define SX126X_TXEN RADIOLIB_NC
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#endif
+
+// Wire Interfaces
+// -------------------
+#define WIRE_INTERFACES_COUNT 1 // 2
+
+// Sense version has IMU and PDM Mic
+// #define XIAO_SENSE
+#ifndef XIAO_SENSE
+// 6 DoF IMU
+#define PIN_LSM6DS3TR_C_POWER (15)
+#define PIN_LSM6DS3TR_C_INT1 (18)
+// PDM Interfaces
+// ---------------
+#define PIN_PDM_PWR (19)
+#define PIN_PDM_CLK (20)
+#define PIN_PDM_DIN (21)
+#endif
+
+// QSPI Pins
+// ---------
+#define PIN_QSPI_SCK (24)
+#define PIN_QSPI_CS (25)
+#define PIN_QSPI_IO0 (26)
+#define PIN_QSPI_IO1 (27)
+#define PIN_QSPI_IO2 (28)
+#define PIN_QSPI_IO3 (29)
+
+// On-board QSPI Flash
+// -------------------
+#define EXTERNAL_FLASH_DEVICES P25Q16H
+#define EXTERNAL_FLASH_USE_QSPI
+
+// Battery
+// -------
+// P0_14 = 14  Reads battery voltage from divider on signal board.
+// PIN_VBAT is reading voltage divider on XIAO and is program pin 32 / or P0.31
+#define BAT_READ 14
+#define BATTERY_SENSE_RESOLUTION_BITS 10
+#define CHARGE_LED 23 // P0_17 = 17  D23   YELLOW CHARGE LED
+#define HICHG 22      // P0_13 = 13  D22   Charge-select pin for Lipo for 100 mA instead of default 50mA charge
+
+// The battery sense is hooked to pin A0 (5)
+#define BATTERY_PIN PIN_VBAT // PIN_A0
+
+// ratio of voltage divider = 3.0 (R17=1M, R18=510k)
+#define ADC_MULTIPLIER 3 // 3.0 + a bit for being optimistic
+
+#ifdef __cplusplus
+}
+#endif
+
+/*----------------------------------------------------------------------------
+ *        Arduino objects - C++ only
+ *----------------------------------------------------------------------------*/
+
+#endif