First Commit

libraries/SdFat/examples/UserChipSelectFunction/UserChipSelectFunction.ino

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+// An example of an external chip select functions.
+// Useful for port expanders or replacement of the standard GPIO functions.
+//
+#include "SdFat.h"
+
+// SD_CHIP_SELECT_MODE must be set to one or two in SdFat/SdFatConfig.h.
+// A value of one allows optional replacement and two requires replacement.
+#if SD_CHIP_SELECT_MODE == 1 || SD_CHIP_SELECT_MODE == 2
+
+// SD chip select pin.
+#define SD_CS_PIN SS
+
+#define SD_CONFIG SdSpiConfig(SD_CS_PIN, SHARED_SPI, SD_SCK_MHZ(50))
+
+SdFat sd;
+
+// Stats to verify function calls.
+uint32_t initCalls = 0;
+uint32_t writeCalls = 0;
+//------------------------------------------------------------------------------
+// Modify these functions for your port expander or custom GPIO library.
+void sdCsInit(SdCsPin_t pin) {
+  initCalls++;
+  pinMode(pin, OUTPUT);
+}
+void sdCsWrite(SdCsPin_t pin, bool level) {
+  writeCalls++;
+  digitalWrite(pin, level);
+}
+//------------------------------------------------------------------------------
+void setup() {
+  Serial.begin(9600);
+  if (!sd.begin(SD_CONFIG)) {
+    sd.initErrorHalt(&Serial);
+  }
+  sd.ls(&Serial, LS_SIZE);
+
+  Serial.print(F("sdCsInit calls: "));
+  Serial.println(initCalls);
+  Serial.print(F("sdCsWrite calls: "));
+  Serial.println(writeCalls);
+}
+//------------------------------------------------------------------------------
+void loop() {}
+#else  // SD_CHIP_SELECT_MODE == 1 || SD_CHIP_SELECT_MODE == 2
+#error SD_CHIP_SELECT_MODE must be one or two in SdFat/SdFatConfig.h
+#endif  // SD_CHIP_SELECT_MODE == 1 || SD_CHIP_SELECT_MODE == 2