board support: add LilyGo T-Echo Lite

README.md

@@ -52,7 +52,8 @@
 - Heltec T096
 - Heltec T1
 - Heltec T114 / HT-nRF5262
-- LilyGO T-Echo
+- LilyGo T-Echo
+- LilyGo T-Echo Lite
 - Minewsemi MX25LE01
 - Nologo ProMicro NRF52840 (aka SuperMini NRF52840)
 - RAK 4631
@@ -78,6 +79,7 @@ When in OTA DFU mode, devices advertise using a board-specific name rather than
 | Heltec T1                    | `T1_DFU`                 |
 | Heltec T114                  | `T114_DFU`               |
 | LILYGO T-Echo                | `LGTE_DFU`               |
+| LILYGO T-Echo Lite           | `LTEL_DFU`               |
 | Minewsemi MX25LE01           | `MX25_DFU`               |
 | ProMicro NRF52840            | `PROM_DFU`               |
 | RAK 4631                     | `4631_DFU`               |

src/boards/lilygo_techo_lite/board.cmake

@@ -0,0 +1 @@
+set(MCU_VARIANT nrf52840)

src/boards/lilygo_techo_lite/board.h

@@ -0,0 +1,66 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef _LILYGO_TECHO_LITE_H
+#define _LILYGO_TECHO_LITE_H
+
+#define _PINNUM(port, pin)    ((port)*32 + (pin))
+
+#define UICR_REGOUT0_VALUE UICR_REGOUT0_VOUT_3V3
+
+#define PIN_LDO_ENABLE      _PINNUM(0, 30)
+
+/*------------------------------------------------------------------*/
+/* LED
+ *------------------------------------------------------------------*/
+#define LEDS_NUMBER         2
+#define LED_PRIMARY_PIN     _PINNUM(1, 7) // Green
+#define LED_SECONDARY_PIN   _PINNUM(1, 5) // Blue
+#define LED_STATE_ON        0
+
+/*------------------------------------------------------------------*/
+/* BUTTON
+ *------------------------------------------------------------------*/
+#define BUTTONS_NUMBER    2  // hold down user button on boot to enter OTA DFU mode.
+#define BUTTON_1          _PINNUM(0, 24)  // user button
+#define BUTTON_2          _PINNUM(0, 24)
+#define BUTTON_PULL       NRF_GPIO_PIN_PULLUP
+
+//--------------------------------------------------------------------+
+// BLE OTA
+//--------------------------------------------------------------------+
+#define BLEDIS_MANUFACTURER  "LilyGo"
+#define BLEDIS_MODEL         "T-Echo-Lite"
+
+//--------------------------------------------------------------------+
+// USB
+//--------------------------------------------------------------------+
+#define USB_DESC_VID           0x239A
+#define USB_DESC_UF2_PID       0x00DA
+#define USB_DESC_CDC_ONLY_PID  0x00DA
+
+#define UF2_PRODUCT_NAME  "Lilygo"
+#define UF2_VOLUME_LABEL  "TECHOLITE"
+#define UF2_BOARD_ID      "T-Echo-Lite-nRF52840"
+#define UF2_INDEX_URL     "https://www.lilygo.cc/"
+
+#endif // _LILYGO_TECHO_LITE_H

src/boards/lilygo_techo_lite/board.mk

@@ -0,0 +1,2 @@
+MCU_SUB_VARIANT = nrf52840
+CFLAGS += -DDEVICE_NAME='"LTEL_DFU"'

src/boards/lilygo_techo_lite/pinconfig.c

@@ -0,0 +1,28 @@
+#include "boards.h"
+#include "uf2/configkeys.h"
+
+__attribute__((used, section(".bootloaderConfig")))
+const uint32_t bootloaderConfig[] =
+{
+  /* CF2 START */
+  CFG_MAGIC0, CFG_MAGIC1,                       // magic
+  5, 100,                                       // used entries, total entries
+
+  204, 0x100000,                                // FLASH_BYTES = 0x100000
+  205, 0x40000,                                 // RAM_BYTES = 0x40000
+  208, (USB_DESC_VID << 16) | USB_DESC_UF2_PID, // BOOTLOADER_BOARD_ID = USB VID+PID, used for verification when updating bootloader via uf2
+  209, 0xada52840,                              // UF2_FAMILY = 0xada52840
+  210, 0x20,                                    // PINS_PORT_SIZE = PA_32
+
+  0, 0, 0, 0, 0, 0, 0, 0
+  /* CF2 END */
+};
+
+void board_init2(void) {
+  nrf_gpio_cfg_output(PIN_LDO_ENABLE);
+  nrf_gpio_pin_write(PIN_LDO_ENABLE, 1);
+}
+
+void board_teardown2(void) {
+  nrf_gpio_pin_write(PIN_LDO_ENABLE, 0);
+}