Using DMA SPI transfers results in more than doubled network speed. (#6)

PontusO · Pontus Oldberg · web-flow · commit 80c0fa89b157 · 2024-10-08T10:38:02.000+02:00
* Using DMA SPI transfers results in more than doubled network speed for RP2040/RP2350 based boards.

* Ensure DMA transfers are not enabled for the Mbed core.

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Co-authored-by: Pontus Oldberg &lt;pontus.oldberg@non.se.com&gt;
diff --git a/src/EspSpiDriver.cpp b/src/EspSpiDriver.cpp
@@ -333,9 +333,14 @@ int esp_host_send_and_receive(void) {
       SPIWIFI.beginTransaction(SPISettings(1000000ul * ESPHOSTSPI_MHZ, MSBFIRST, SPI_MODE2));
       digitalWrite(ESP_CS, LOW);
       delayMicroseconds(100);
+#if defined(ARDUINO_ARCH_RP2040) && !defined(ARDUINO_ARCH_MBED) 
+      SPIWIFI.transferAsync((const void *)esp32_spi_tx_buffer, (void *)esp32_spi_rx_buffer, MAX_SPI_BUFFER_SIZE);
+      while (!SPIWIFI.finishedAsync());
+#else
       for (int i = 0; i < MAX_SPI_BUFFER_SIZE; i++) {
         esp32_spi_rx_buffer[i] = SPIWIFI.transfer(esp32_spi_tx_buffer[i]);
       }
+#endif
       digitalWrite(ESP_CS, HIGH);
       SPIWIFI.endTransaction();
 
