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refactor(isp): read DMA input directly from flash

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Avoid the PSRAM copy for unencrypted flash
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morris
2026-07-24 11:48:42 +08:00
parent 16c8013af4
commit 91a87cfb36
10 changed files with 77 additions and 52 deletions
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examples/peripherals/isp/dma_input/README.md
+6 -11
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@@ -5,19 +5,18 @@
## Overview
This example embeds a 240 x 280 RAW8 Bayer image of a real scene in flash, copies it into a DMA-capable PSRAM input buffer, feeds it into the ISP through DW-GDMA, and prints the RGB888 output as base64. The pytest script decodes the output into a PPM image and compares it with the checked-in golden image.
This example embeds a 240 x 280 RAW8 Bayer image of a real scene in flash, feeds it directly into the ISP through DW-GDMA, and prints the RGB888 output as base64. The ISP driver synchronizes the DMA buffers' cache automatically. The pytest script decodes the output into a PPM image and compares it with the checked-in golden image.
The data flow is:
1. The embedded BGGR RAW8 image is copied from flash into the ISP DMA input buffer.
2. The image is transferred into the ISP via `DW-GDMA → ISP DMA input`.
3. The ISP processes the data (demosaic, color adjustment) and outputs RGB888 (BGR24 byte layout).
4. The RGB888 frame is base64-encoded and printed with machine-parseable markers.
5. pytest decodes the payload, swaps BGR→RGB, saves one PPM file per frame, and compares it with the golden image.
1. The embedded 16-byte-aligned BGGR RAW8 image is transferred from mapped flash into the ISP via `DW-GDMA → ISP DMA input`.
2. The ISP processes the data (demosaic, color adjustment) and outputs RGB888 (BGR24 byte layout).
3. The RGB888 frame is base64-encoded and printed with machine-parseable markers.
4. pytest decodes the payload, swaps BGR→RGB, saves one PPM file per frame, and compares it with the golden image.
## Hardware Required
- An ESP32-P4 devkit with PSRAM (this example allocates the ISP DMA input/output buffers from PSRAM).
- An ESP32-P4 devkit with PSRAM (this example allocates the ISP output buffer from PSRAM).
## How to Use
@@ -43,7 +42,3 @@ IMAGE_BASE64_END
Frame 0 done
ISP DMA visual demo done.
```
## Reference
- [ESP-IDF: Image Signal Processor](https://docs.espressif.com/projects/esp-idf/en/latest/esp32p4/api-reference/peripherals/isp.html)