tfaour
85a5238724
Ports Waveshare's official EPD_7in3e.c register/refresh sequence (the panel has no public datasheet, so their reference driver is the source of truth) to an ESP-IDF component using spi_master + gpio instead of the bcm2835/RPi hardware abstraction the reference targets. Unlike the reference driver, which toggles CS around every single byte, this holds CS low for each logical command/data phase and DMAs pixel data in 4KB chunks -- sending ~192,000 individual one-byte SPI transactions would make a full refresh impractically slow. Exposes a streaming API (epd_display_stream, pulling chunks from a caller-supplied read_fn) so the eventual HTTP fetch path can feed the panel without holding a full ~192KB frame in RAM, plus an in-memory convenience wrapper (epd_display_buffer) for cases like the upcoming QR code screen where buffering the whole frame is fine. Wired into wifi_provisioning_start() as an init + white-clear for now, to prove the driver builds/links/runs at the right point in the boot sequence ahead of the actual QR code content.
40 lines
1.0 KiB
Plaintext
40 lines
1.0 KiB
Plaintext
menu "E-Paper Display (epd7in3e) Configuration"
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config EPD_PIN_CLK
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int "SPI CLK (SCLK) GPIO"
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default 18
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help
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Not physically wired yet -- these are sensible ESP32-C6 devkit
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defaults (avoiding strapping pins 4/5/8/9/15 and the USB-JTAG
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pins 12/13). Override to match your actual wiring.
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config EPD_PIN_MOSI
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int "SPI MOSI (DIN) GPIO"
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default 19
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config EPD_PIN_CS
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int "SPI CS GPIO"
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default 20
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config EPD_PIN_DC
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int "Data/Command GPIO"
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default 21
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config EPD_PIN_RST
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int "Reset GPIO"
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default 22
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config EPD_PIN_BUSY
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int "Busy GPIO"
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default 23
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config EPD_SPI_CLOCK_HZ
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int "SPI clock speed (Hz)"
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default 4000000
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help
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The panel's SPI interface is rated well above this, but dupont
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wires/breadboards are often unreliable much past a few MHz.
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Raise this once the physical wiring is confirmed solid.
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endmenu
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