Add simple SPI slave example
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@ -9,14 +9,11 @@
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void setupSPI(void)
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{
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pinMode(PA7, INPUT); // MOSI1
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pinMode(PA6, INPUT); // MISO1
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pinMode(PA5, INPUT); // SCK
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// MOSI, MISO, SCK PINs are set by the library
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pinMode(BOARD_SPI_DEFAULT_SS, INPUT); // SS
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// Select SPI1
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SPI.setModule(1);
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// The clock value is not used
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// SPI1 is selected by default
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SPI.beginTransactionSlave(SPISettings(18000000, MSBFIRST, SPI_MODE0, DATA_SIZE_8BIT));
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}
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@ -24,9 +21,6 @@ void setup()
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{
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Serial.begin(115200);
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delay(100);
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// Data that master will receive when transferring a data frame over SPI
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SPI.dev()->regs->DR = 0;
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setupSPI();
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}
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@ -34,13 +28,12 @@ uint8_t count(0);
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void loop()
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{
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// Blocking call to read SPI message
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uint8_t msg(SPI.read());
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Serial.print("Received = 0b");
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uint8_t msg = SPI.transfer(++count);
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Serial.print("a Received = 0b");
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Serial.print(msg, BIN);
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Serial.print(", 0x");
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Serial.print(msg, HEX);
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Serial.print(", ");
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Serial.println(msg);
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// Next data frame that will be received by master
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SPI.dev()->regs->DR = ++count;
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}
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