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.