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Renode models for SAI audio through the WM8994 - #122
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Adds a DMA2 model with circular mode and half-transfer interrupts (Renode's STM32DMA has neither), an STM32F7 SAI that paces frames from the RCC kernel clock and serializes them bit by bit with their FS level, and a WM8994 on I2C3 that decodes that stream per AIF1_CONTROL1 and writes what DAC1 receives to a file. Used to reproduce crackling playback on STM32F746G-DISCO: the codec was left in right-justified mode (dmwm8994) and the SAI writer starved its queue on a 10 ms tick (dmsai). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Nr1HhezRY951yBxxTm1b65
This was referenced Oct 11, 2026
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Summary
Adds
configs/renode/STM32F7_Audio.cswith three Renode models. They let audio playback on STM32F746G-DISCO run and be inspected in emulation.STM32F7_AudioDMA: a replacement for DMA2 with circular mode and half-transfer interrupts. Renode'sSTM32DMAcopies memory-to-peripheral data in one go and has neither CIRC nor HTIF, both of which dmsai depends on. Peripheral-to-memory requests behave as in Renode's model, so the SD host keeps working.STM32F7_SAI: paces frames from the RCC kernel clock (PLLSAI/PLLI2S, MCKDIV). It serializes each frame bit by bit, using FRCR/SLOTR/CR1 for the FS level, data size and slots, and requests DMA to keep its FIFO fed. A synchronous RX block B is also modeled.WM8994: an I2C register file on I2C3 at 0x1A. It decodes the bit stream according to AIF1_CONTROL1 (format, word length, LRCLK inversion) and writes what DAC1 receives to a raw stereo s16le file.The file header describes how to load the models. They are not wired into
renode.rescyet: the board'sflash.dmdloads the FT5336 touch config, which owns I2C3 just like dmwm8994'scodec.ini.Why
These models reproduced crackling playback and found two causes:
0/-32768.With both fixes, the captured output matches the played melody note for note.
🤖 Generated with Claude Code
https://claude.ai/code/session_01Nr1HhezRY951yBxxTm1b65
Generated by Claude Code