T-Echo-Card support (#10267)

2026-05-19 09:31:04 +02:00
parent 622aa046f1
commit 1747e2d8e5
22 changed files with 414 additions and 28 deletions
@@ -0,0 +1,66 @@
+/*
+  Copyright (c) 2014-2015 Arduino LLC.  All right reserved.
+  Copyright (c) 2016 Sandeep Mistry All right reserved.
+  Copyright (c) 2018, Adafruit Industries (adafruit.com)
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "variant.h"
+#include "Arduino.h"
+#include "nrf.h"
+#include "wiring_constants.h"
+#include "wiring_digital.h"
+
+const uint32_t g_ADigitalPinMap[] = {
+    // P0 - pins 0 and 1 are hardwired for xtal and should never be enabled
+    0xff, 0xff, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+
+    // P1
+    32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47};
+
+void initVariant()
+{
+    // No plain GPIO LEDs on this board (only WS2812 addressable LEDs, not driven here).
+}
+
+// Reproduces the vendor firmware's boot sequence from
+// examples/original_test/original_test.ino. Runs before Meshtastic touches
+// PIN_POWER_EN, so the RT9080 LDO gets a clean reset pulse and peripherals
+// whose EN pins must be LOW at boot (GPS_EN, GPS_RF_EN, BUZZER) aren't left
+// floating while the 3V3 rail is ramping.
+void earlyInitVariant()
+{
+    // 3.3V rail: toggle RT9080_EN HIGH → LOW → HIGH with 100 ms dwell so the
+    // LDO enters enable from a known state. The single-shot HIGH in main.cpp
+    // is not enough on this hardware — if the chip was in a half-enabled
+    // state from a previous reset, the rail brown-outs once LoRa TX fires.
+    pinMode(PIN_POWER_EN, OUTPUT);
+    digitalWrite(PIN_POWER_EN, HIGH);
+    delay(100);
+    digitalWrite(PIN_POWER_EN, LOW);
+    delay(100);
+    digitalWrite(PIN_POWER_EN, HIGH);
+    delay(100);
+
+    // Park peripherals with active-high enables LOW so they don't sink
+    // current while the rest of setup() runs.
+    pinMode(PIN_GPS_STANDBY, OUTPUT);
+    digitalWrite(PIN_GPS_STANDBY, LOW);
+    pinMode(PIN_GPS_RESET, OUTPUT);
+    digitalWrite(PIN_GPS_RESET, LOW);
+    pinMode(PIN_BUZZER, OUTPUT);
+    digitalWrite(PIN_BUZZER, LOW);
+}