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Fixes #1183 — T-Echo Lite incorrect battery voltage

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Battery (TechoBoard.h/cpp): Added PIN_VBAT_MEAS_EN (P0.31) — the T-Echo
Lite has a gated voltage divider that must be enabled before reading. Also
added pinMode(PIN_VBAT_READ, INPUT) before each ADC read to reclaim P0.02
from other peripherals. Pin definitions hardcoded from LilyGo's
t_echo_lite_config.h.

I2C (variant.h): Corrected SDA/SCL from P0.04/P0.02 to P1.04/P1.02 per
LilyGo's IIC_1_SDA/IIC_1_SCL. The old P0.02 mapping conflicted with the
battery ADC pin.

GPS (variant.h): Corrected all five GPS pin assignments to match LilyGo's
config — UART TX/RX, wake, PPS, and power enable were all scrambled.

SPI (variant.h): Fixed SPI_INTERFACES_COUNT from _PINNUM(0, 2) to (2).

Tested on T-Echo Lite Non-Shell (USB-C, no display). Battery readings match
Heltec V4 reference within 10mV.
This commit is contained in:
pelgraine
2026-04-10 14:25:51 +10:00
committed by Matthias Wientapper
parent 46b5076082
commit 8217a67f0c
3 changed files with 53 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
variants/lilygo_techo_lite/variant.h
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@@ -24,7 +24,7 @@
#define PIN_PWR_EN _PINNUM(0, 30) // RT9080_EN
#define BATTERY_PIN _PINNUM(0, 2)
#define ADC_MULTIPLIER (4.90F)
#define ADC_MULTIPLIER (2.0F)
#define ADC_RESOLUTION (14)
#define BATTERY_SENSE_RES (12)
@@ -47,13 +47,13 @@
////////////////////////////////////////////////////////////////////////////////
// I2C pin definition
#define PIN_WIRE_SDA _PINNUM(0, 4) // (SDA)
#define PIN_WIRE_SCL _PINNUM(0, 2) // (SCL)
#define PIN_WIRE_SDA _PINNUM(1, 4) // (SDA) - per LilyGo IIC_1_SDA
#define PIN_WIRE_SCL _PINNUM(1, 2) // (SCL) - per LilyGo IIC_1_SCL
////////////////////////////////////////////////////////////////////////////////
// SPI pin definition
#define SPI_INTERFACES_COUNT _PINNUM(0, 2)
#define SPI_INTERFACES_COUNT (2)
#define PIN_SPI_MISO _PINNUM(0, 17) // (MISO)
#define PIN_SPI_MOSI _PINNUM(0, 15) // (MOSI)
@@ -149,10 +149,11 @@ extern const int SCK;
#define PIN_DISPLAY_BUSY DISP_BUSY
////////////////////////////////////////////////////////////////////////////////
// GPS
// GPS — per LilyGo t_echo_lite_config.h
// PIN_GPS_TX/RX named from GPS module's perspective
#define PIN_GPS_RX _PINNUM(1, 13) // RXD
#define PIN_GPS_TX _PINNUM(1, 15) // TXD
#define GPS_EN _PINNUM(1, 11) // POWER_RT9080_EN
#define PIN_GPS_STANDBY _PINNUM(1, 10)
#define PIN_GPS_PPS _PINNUM(0, 29) // 1PPS
#define PIN_GPS_TX _PINNUM(0, 29) // GPS UART TX → MCU RX
#define PIN_GPS_RX _PINNUM(1, 10) // GPS UART RX ← MCU TX
#define GPS_EN _PINNUM(1, 11) // GPS RT9080 power enable
#define PIN_GPS_STANDBY _PINNUM(1, 13) // GPS wake-up
#define PIN_GPS_PPS _PINNUM(1, 15) // GPS 1PPS