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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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17
test/test_bootpins/test_bootpins.cpp
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@ -19,10 +19,18 @@ static void test_gpio0_picks_the_boot_mode() {
TEST_ASSERT_NOT_NULL(strstr(effect, "download mode"));
}
static void test_gpio2_blocks_flashing_over_usb() {
// It only counts with GPIO0 low, so the board boots, but esptool can't
// start the download mode while it is high.
const char *effect = bootPinEffect(2);
TEST_ASSERT_NOT_NULL(effect);
TEST_ASSERT_NOT_NULL(strstr(effect, "high"));
TEST_ASSERT_NOT_NULL(strstr(effect, "USB"));
}
static void test_harmless_strapping_pins_are_not_listed() {
// 2 only matters for the download mode, 5 and 15 set the SDIO timing and
// the boot log. 5 is the default CSN.
TEST_ASSERT_NULL(bootPinEffect(2));
// 5 and 15 set the SDIO timing and quiet the boot log. 5 is the default
// CSN.
TEST_ASSERT_NULL(bootPinEffect(5));
TEST_ASSERT_NULL(bootPinEffect(15));
}
@ -34,14 +42,17 @@ static void test_default_radio_pins_are_safe() {
}
static void test_other_chips_boot_pins_are_safe_here() {
TEST_ASSERT_NULL(bootPinEffect(8));
TEST_ASSERT_NULL(bootPinEffect(9));
TEST_ASSERT_NULL(bootPinEffect(45));
TEST_ASSERT_NULL(bootPinEffect(46));
}
int main(int, char **) {
UNITY_BEGIN();
RUN_TEST(test_gpio12_picks_the_flash_voltage);
RUN_TEST(test_gpio0_picks_the_boot_mode);
RUN_TEST(test_gpio2_blocks_flashing_over_usb);
RUN_TEST(test_harmless_strapping_pins_are_not_listed);
RUN_TEST(test_default_radio_pins_are_safe);
RUN_TEST(test_other_chips_boot_pins_are_safe_here);