EspSpiDriver - pins and frequency configuration defines

JAndrassy · JAndrassy · commit 7a1b5cb26138 · 2024-02-10T17:33:03.000+01:00
diff --git a/README.md b/README.md
@@ -6,11 +6,17 @@ The library is meant to serve as low level driver for a LwIP network interface i
 
 The library was originally written for Arduino Portenta C33 with Arduino Renesas Core.
 
-## Notes:
+## Configuration
 
-* configuration is TODO
-* pins are hardcoded in EspSpiDriver
-* SPI SCK is set to 10 MHz for classic ESP32
+Pins are configured with defines. To add the defines, modify boards.txt or create boards.local.txt next to boards.txt and add <board>.build.extra_flags=. For boards with defines for the WiFiNINA library it is enough to add `-DESPHOSTSPI`.
+
+Complete settings require to specify pins. Example:
+
+```
+rpipico.build.extra_flags=-DESPHOST_RESET=D5 -DESPHOST_HANDSHAKE=D7 -DESPHOST_DATA_READY=D6 -DESPHOST_CS=D10 -DESPHOSTSPI=SPI
+```
+
+Default SPI frequency set in the library is 10 MHz. It is the highest SPI speed for classic ESP32. Firmware for C and S series ESP32 are build with higher SPI frequency. To specify the SPI frequency to be used by the ESPHost library, add `-DESPHOSTSPI_MHZ=30` to `<board>.build.extra_flags`.
 
 ## Firmware
 
diff --git a/src/EspSpiDriver.cpp b/src/EspSpiDriver.cpp
@@ -41,6 +41,14 @@
 #define DATA_READY        SPIWIFI_ACK
 #define ESP_CS            SPIWIFI_SS
 
+#elif defined(ESPHOSTSPI)
+#define ESP_RESET         ESPHOST_RESET
+#define HANDSHAKE         ESPHOST_HANDSHAKE
+#define DATA_READY        ESPHOST_DATA_READY
+
+#define ESP_CS  ESPHOST_CS
+#define SPIWIFI ESPHOSTSPI
+
 #elif USE_ESP32_DEVKIT
 /* GPIOs */
 #define ESP_RESET         5
@@ -61,6 +69,10 @@
 #define ESP_CS     103
 #endif
 
+#ifndef ESPHOSTSPI_MHZ
+#define ESPHOSTSPI_MHZ 10
+#endif
+
 /* #################
  * PRIVATE Variables
  * ################# */
@@ -318,8 +330,9 @@ int esp_host_send_and_receive(void) {
       Serial.println();
       #endif
 
-      SPIWIFI.beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE2));
+      SPIWIFI.beginTransaction(SPISettings(1000000ul * ESPHOSTSPI_MHZ, MSBFIRST, SPI_MODE2));
       digitalWrite(ESP_CS, LOW);
+      delayMicroseconds(100);
       for (int i = 0; i < MAX_SPI_BUFFER_SIZE; i++) {
         esp32_spi_rx_buffer[i] = SPIWIFI.transfer(esp32_spi_tx_buffer[i]);
       }
