[Scrum] - PSLab - 20260617

[Santosh Bala]

1. What did I work on yesterday?

• Experimented with SPI communication.
• Pico as SPI slave, ESP as master where multi byte frames always corrupted with the first byte clean, rest repeated.
• DMA pre arm on Pico slave also had the same repeated first byte pattern.
• PL022 slave seems unreliable for multibyte transfers in this configuration.
• Flipped to Pico as SPI master, ESP32-C3 as slave.
• ESP-IDF's SPI slave driver with queued DMA has better support.
• Then I implemented fixed 64 byte self describing frames (magic, frame type, seq, length, checksum, payload)
• Scaled to 512 byte frames with 500 byte payload
• ESP side: 4 queued DMA slave transactions, requeued immediately after completion
• Pico side: DMA based SPI master, speed sweep from 100kHz to 20MHz.
• I was able to get a stable result at 20 Mhz, 0 frame errors, 0 header errors.
• Usable throughput is about 1.72 MB/s

2. What do I plan to do today?

• Start working on ESP32 to host computer communication through wifi. Explore different options and begin work on a test application.

3. What is blocking me from making progress?

• Nothing at the moment.