Disable VDDH check for nRF52833/40 boards unless explicitly enabled

README_BuildProcess.md

@@ -134,6 +134,7 @@ This is a partial list of definitions that can be added in a `BOARD.py` file's `
 * `ESPR_DCDC_ENABLE=1` - On NRF52 use the built-in DCDC converter (requires external hardware)
 * `ESPR_DCDC_HV_ENABLE=1` - On NRF52840 use the built-in high-voltage (REG0) DCDC converter (requires external hardware)
 * `ESPR_REGOUT0_1_8V=1` - On NRF52830/40 set the REG0 VCC voltage to 1.8v (the default is 3.3v)
+* `ESPR_VREF_VDDH=1` - when measuring system voltage (eg for E.getAnalogVRef()) use VDDH, not VDD (only useful if DCDC_HV enabled)
 * `ESPR_LSE_ENABLE` - On NRF52 use an external 32kHz Low Speed External crystal on D0/D1
 * `ESPR_NO_LOADING_SCREEN` - Bangle.js, don't show a 'loading' screen when loading a new app
 * `ESPR_BOOTLOADER_SPIFLASH` - Allow bootloader to flash direct from a file in SPI flash storage

targets/nrf5x/jshardware.c

@@ -2818,9 +2818,6 @@ JsVarFloat jshReadVRef() {
   config.gain = NRF_SAADC_GAIN1_6; // 1/6 of input volts
   config.mode = NRF_SAADC_MODE_SINGLE_ENDED;
 
-#if defined(NRF52833) || defined(NRF52840) && !defined(BANGLEJS2)
-  #define ESPR_VREF_VDDH
-#endif
 #ifdef ESPR_VREF_VDDH
   config.pin_p = 0x0D; // Not in Nordic's libs, but this is VDDHDIV5 - we probably want to be looking at VDDH
   config.pin_n = 0x0D;