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fix: warn of radio pins that block flashing over USB

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GPIO2 on the original ESP32, 46 on the S2/S3 and 8 on the C3/C6 don't stop
a normal boot, but held at the wrong level at reset they keep esptool from
starting the download mode.  The WT32-ETH01 wiring puts TX on GPIO2.

Each warning now says what the pin does and what to do: move it for a pin
that stops the boot, disconnect it to flash for one that only blocks USB.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
cjkas 2026-10-29 22:54:11 +01:00
parent 658f5eabeb
commit 92e69d599f
6 changed files with 87 additions and 40 deletions
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16
test/js/pins.test.js
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@ -18,6 +18,22 @@ test('RX on GPIO12 warns of the flash voltage on the original ESP32', () => {
assert.match(warnings[0], /1\.8 V/);
});
test('TX on GPIO2 warns of flashing over USB on the original ESP32', () => {
// The WT32-ETH01 wiring in the wiki.
const warnings = BootPins.radioWarnings('', Object.assign({}, esp32Defaults, { TXPin: 2 }));
assert.equal(warnings.length, 1);
assert.match(warnings[0], /^TX is on GPIO-2, .*Held high, it stops flashing over USB, so disconnect it to flash\.$/);
});
test('GPIO8 held low blocks flashing on the C3 and C6', () => {
const config = { SCKPin: 4, CSNPin: 7, MOSIPin: 6, MISOPin: 5, TXPin: 10, RXPin: 8 };
for (const chip of ['c3', 'c6']) {
const warnings = BootPins.radioWarnings(chip, config);
assert.equal(warnings.length, 1);
assert.match(warnings[0], /^RX is on GPIO-8, .*Held low, it stops flashing over USB/);
}
});
test('an unknown chip model warns of nothing', () => {
assert.deepEqual(BootPins.radioWarnings('h2', Object.assign({}, esp32Defaults, { RXPin: 12 })), []);
});