mirror of
https://github.com/markqvist/RNode_Firmware.git
synced 2026-04-27 22:35:36 +00:00
5e19294dea
SharedSPI.h: FreeRTOS mutex protecting the shared SPI bus (pins 33/34/35) used by LoRa (SX1262), SD card, and future NFC. sx126x.cpp: All 6 SPI transaction blocks wrapped with shared_spi_mutex acquire/release. LoRa uses portMAX_DELAY (always gets access, just delayed by SD if needed). USBSD.h: USB MSC SD card access uses shared_spi_mutex with 200ms timeout. Deferred init (3s after boot) for SPI bus readiness. Metrics: sd_ready, sd_reads, sd_fails counters. IMULogger.h, Gui.h: SD card writes wrapped in shared_spi_mutex. Status: SD card correctly reports 29.7GB via USB MSC. Reads work intermittently (~50% success). Root cause: main loop takes ~700ms per iteration, causing mutex timeout for MSC callbacks. Needs loop time investigation to achieve reliable USB mass storage. The CO5300 display uses a separate SPI3 bus — not affected.
24 lines
785 B
C
24 lines
785 B
C
// SharedSPI — global mutex for the shared SPI bus (pins MISO=33, MOSI=34, CLK=35)
|
|
//
|
|
// Users of this bus MUST acquire shared_spi_mutex before any SPI transaction
|
|
// and release it after. This prevents race conditions between:
|
|
// - SX1262 LoRa radio (CS=36) — main loop, continuous polling
|
|
// - SD card (CS=21) — USB MSC callbacks (TinyUSB task), IMU logger, screenshots
|
|
// - ST25R3916 NFC (CS=4) — future, not yet implemented
|
|
//
|
|
// The CO5300 display uses a separate SPI3 bus and does NOT need this mutex.
|
|
|
|
#ifndef SHARED_SPI_H
|
|
#define SHARED_SPI_H
|
|
|
|
#include <freertos/semphr.h>
|
|
|
|
extern SemaphoreHandle_t shared_spi_mutex;
|
|
|
|
inline void shared_spi_init() {
|
|
if (!shared_spi_mutex) {
|
|
shared_spi_mutex = xSemaphoreCreateMutex();
|
|
}
|
|
}
|
|
|
|
#endif // SHARED_SPI_H
|