66 lines
No EOL
1.7 KiB
C++
66 lines
No EOL
1.7 KiB
C++
// This is a simple SPI loop-back test.
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//
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// Connect SD_MISO to SD_MOSI
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//
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// Modify these defines for your configuration.
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#define SD_SPI SPI
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#define SD_MISO MISO
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#define SD_MOSI MOSI
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#include "SPI.h"
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void setup() {
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uint8_t rx, tx;
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Serial.begin(9600);
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while (!Serial) {
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yield();
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}
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Serial.println(F("\nType any character to start"));
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while (!Serial.available()) {
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yield();
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}
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Serial.print("Begin, SD_MISO: ");
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Serial.print(SD_MISO), Serial.print(", SD_MOSI: ");
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Serial.println(SD_MOSI);
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pinMode(SD_MISO, INPUT_PULLUP);
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pinMode(SD_MOSI, OUTPUT);
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digitalWrite(SD_MOSI, HIGH);
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if (!digitalRead(SD_MISO)) {
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Serial.println("Error: SD_MISO not HIGH");
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goto fail;
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}
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digitalWrite(SD_MOSI, LOW);
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if (digitalRead(SD_MISO)) {
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Serial.println("Error: SD_MISO not LOW");
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goto fail;
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}
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pinMode(SD_MISO, INPUT);
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pinMode(SD_MOSI, INPUT);
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// Modify if SD_SPI.begin has arguments and use this style SdFat begin call:
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// sd.begin(SdSpiConfig(CS_PIN, USER_SPI_BEGIN | <other options>, &SD_SPI));
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SD_SPI.begin();
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// Start with a 400 kHz clock. Try full speed if success for 400 kHz.
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SD_SPI.beginTransaction(SPISettings(400000, MSBFIRST, SPI_MODE0));
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tx = 0;
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do {
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rx = SD_SPI.transfer(tx);
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if (tx != rx) {
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Serial.print("Error rx: 0x");
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Serial.print(rx, HEX);
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Serial.print(" != tx: 0x");
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Serial.println(tx, HEX);
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SD_SPI.endTransaction();
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goto fail;
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}
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} while (tx++ < 255);
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SD_SPI.endTransaction();
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Serial.println("Success!");
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return;
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fail:
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SD_SPI.endTransaction();
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Serial.println("Is SD_MISO connected to SD_MOSI?");
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Serial.println("Are SD_MISO and SD_MOSI correct?");
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}
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void loop() {} |