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AtomS3R: re-probe the panel ID at low clock speed before giving up #256

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Merged
lovyan03 merged 1 commit into from
Aug 16, 2026
Merged

AtomS3R: re-probe the panel ID at low clock speed before giving up #256

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18 changes: 18 additions & 0 deletions src/M5GFX.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2760,6 +2760,24 @@ The usage of each pin is as follows.
bool is_st7735 = ((id & 0xFFFF) == 0x7683 || (id & 0xFFFF) == 0x897C);
bool is_gc9107 = (id & 0xFFFFFF) == 0x079100;
// ESP_LOGI(LIBRARY_NAME, "[Autodetect] panel_id: 0x%08x", id);
if (!is_st7735 && !is_gc9107)
{ // Some GC9107 batches return a valid ID only at low clock rates;
// re-probe slowly before giving up.
// (ST7735 does not answer at this rate, but a healthy one has
// already been caught by the first probe above.)
bus_spi->release();
bus_cfg.freq_write = 100000;
bus_cfg.freq_read = 100000;
bus_spi->config(bus_cfg);
bus_spi->init();
id = _read_panel_id(bus_spi, GPIO_NUM_14);
// restore the probe speed in bus_cfg: later board probes reuse it
// without setting the frequency themselves.
bus_cfg.freq_write = 8000000;
bus_cfg.freq_read = 8000000;
is_st7735 = ((id & 0xFFFF) == 0x7683 || (id & 0xFFFF) == 0x897C);
is_gc9107 = (id & 0xFFFFFF) == 0x079100;
}
if (is_st7735 || is_gc9107)
{
board = board_t::board_M5AtomS3R;
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