acf81f426c
* Add PIO-based SoftwareSPI enabling SPI on any pins The Raspberry Pi team has a working PIO-based SPI interface. Wrap it to work like a hardware SPI interface, allowing SPI on any pin combination. Tested reading and writing an SD card using unmodified SD library. * Add W5500 example Good for testing, shows non-contiguous pin outs.
84 lines
1.8 KiB
C++
84 lines
1.8 KiB
C++
/*
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SD card basic file example with Software SPI
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This example shows how to create and destroy an SD card file
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The circuit:
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SD card attached to Pico as follows:
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** SCK - GPIO0
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** CS - GPIO1
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** MISO (AKA RX) - GPIO2
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** MOSI (AKA TX) - GPIO3
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created Nov 2010
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by David A. Mellis
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modified 9 Apr 2012
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by Tom Igoe
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This example code is in the public domain.
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*/
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#include <SoftwareSPI.h>
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const int _SCK = 0;
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const int _CS = 1; // Must be SCK+1 for HW CS support
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const int _MISO = 2;
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const int _MOSI = 3;
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SoftwareSPI softSPI(_SCK, _MISO, _MOSI, _CS);
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#include <SD.h>
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File myFile;
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void setup() {
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// Open serial communications and wait for port to open:
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Serial.begin(115200);
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do {
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delay(100); // wait for serial port to connect. Needed for native USB port only
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} while (!Serial);
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Serial.print("Initializing SD card...");
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bool sdInitialized = false;
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sdInitialized = SD.begin(_CS, softSPI);
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if (!sdInitialized) {
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Serial.println("initialization failed!");
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return;
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}
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Serial.println("initialization done.");
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if (SD.exists("example.txt")) {
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Serial.println("example.txt exists.");
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} else {
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Serial.println("example.txt doesn't exist.");
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}
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// open a new file and immediately close it:
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Serial.println("Creating example.txt...");
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myFile = SD.open("example.txt", FILE_WRITE);
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myFile.close();
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// Check to see if the file exists:
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if (SD.exists("example.txt")) {
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Serial.println("example.txt exists.");
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} else {
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Serial.println("example.txt doesn't exist.");
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}
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// delete the file:
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Serial.println("Removing example.txt...");
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SD.remove("example.txt");
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if (SD.exists("example.txt")) {
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Serial.println("example.txt exists.");
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} else {
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Serial.println("example.txt doesn't exist.");
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}
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}
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void loop() {
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// nothing happens after setup finishes.
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}
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