tfaour
1dd02da70a
Vendors two small MIT/BSD-3-Clause libraries rather than hand-rolling either: Nayuki's qrcodegen (QR matrix generation) and Waveshare's Font24 bitmap table from their e-Paper repo (same repo the epd7in3e driver came from) for rendering readable text on the panel. qr_onboarding_show() builds a standard WIFI:T:WPA;S:...;P:...;; payload, rasterizes the QR module matrix plus the SSID and password as plaintext underneath (for anyone provisioning from a device that can't scan a QR) onto a malloc'd frame buffer, and pushes it to the panel via epd_display_buffer(). The buffer is heap-allocated on demand rather than statically reserved, since 192KB held permanently in BSS would eat into the RAM budget the HTTP fetch path (task 6) is specifically trying to keep free. Wired into wifi_provisioning_start() before the softAP comes up, so the join instructions are already on-screen by the time the network is joinable.
epaper_fonts
Vendored fonts.h + font24.c from
Waveshare's e-Paper repo
(RaspberryPi_JetsonNano/c/lib/Fonts/), used unmodified to render the SSID
and password text on the QR onboarding screen. Originally an STMicroelectronics
font table (BSD-3-Clause) redistributed by Waveshare alongside their MIT-licensed
driver code -- see the header comment in each file for the full license text.
Only font24.c is compiled; fonts.h also declares the other sizes
(Font8/Font12/Font16/Font20/the CN fonts) Waveshare ships but this
project doesn't use, left in place unmodified rather than trimmed down.