board: add JC3248W535EN (ESP32-S3, AXS15231B QSPI 320x480)#266
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board: add JC3248W535EN (ESP32-S3, AXS15231B QSPI 320x480)#266yaconsult wants to merge 1 commit into
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Add board configuration for the Jingcai JC3248W535EN development board: - ESP32-S3 with 16 MB flash, 8 MB Octal PSRAM - 3.2" 320x480 IPS display, AXS15231B controller, QSPI @ 20 MHz - Capacitive touch via AXS15231B I2C (SCL=GPIO8, SDA=GPIO4, addr=0x3B) Key fixes vs default AXS15231B config: - Vendor init sequence from official esp_bsp.c (default sequence includes ALL_PIXELS_OFF command 0x22 which corrupts the display) - Init sequence must end with RAMWR (0x2C), not DISPLAY_ON (0x29) - QSPI clock reduced to 20 MHz (40 MHz also works but gives no fps gain; CPU is the bottleneck in draw_bitmap, not bus bandwidth) - Touch pins: SCL=GPIO8, SDA=GPIO4 (corrected from library defaults)
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Summary
Adds board configuration for the Jingcai JC3248W535EN development board.
Hardware
Key fixes vs default AXS15231B configuration
Vendor init sequence is mandatory.
The default library init sequence includes command
0x22(ALL_PIXELS_OFF) which results in a blank or corrupted display. This PR uses the full init sequence from the vendor's official Arduino demo (esp_bsp.c). The sequence must end with0x2C(RAMWR), not0x29(DISPLAY_ON).QSPI clock at 20 MHz.
The QSPI pins on this board route through the ESP32-S3 GPIO matrix. 40 MHz is electrically stable but provides no fps improvement (CPU is the bottleneck in draw_bitmap, not bus bandwidth), so 20 MHz is used for margin.
Touch pin correction.
SCL=GPIO8, SDA=GPIO4 (corrected from library defaults).
Testing
Tested with MicroPython firmware on the physical board. Display initialises correctly, touch reports coordinates, full-frame RGB565 updates work.