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Add simple SPI slave example

This commit is contained in:
Victor Lamoine 2018-04-20 17:27:45 +02:00
parent 45b51dea12
commit 6e814ad5ca
1 changed files with 5 additions and 12 deletions
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17
STM32F1/libraries/SPI/examples/spi_slave/spi_slave.ino
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@ -9,14 +9,11 @@
void setupSPI(void) void setupSPI(void)
{ {
pinMode(PA7, INPUT); // MOSI1 // MOSI, MISO, SCK PINs are set by the library
pinMode(PA6, INPUT); // MISO1
pinMode(PA5, INPUT); // SCK
pinMode(BOARD_SPI_DEFAULT_SS, INPUT); // SS pinMode(BOARD_SPI_DEFAULT_SS, INPUT); // SS
// Select SPI1
SPI.setModule(1);
// The clock value is not used // The clock value is not used
// SPI1 is selected by default
SPI.beginTransactionSlave(SPISettings(18000000, MSBFIRST, SPI_MODE0, DATA_SIZE_8BIT)); SPI.beginTransactionSlave(SPISettings(18000000, MSBFIRST, SPI_MODE0, DATA_SIZE_8BIT));
} }
@ -24,9 +21,6 @@ void setup()
{ {
Serial.begin(115200); Serial.begin(115200);
delay(100); delay(100);
// Data that master will receive when transferring a data frame over SPI
SPI.dev()->regs->DR = 0;
setupSPI(); setupSPI();
} }
@ -34,13 +28,12 @@ uint8_t count(0);
void loop() void loop()
{ {
// Blocking call to read SPI message // Blocking call to read SPI message
uint8_t msg(SPI.read()); uint8_t msg = SPI.transfer(++count);
Serial.print("Received = 0b"); Serial.print("a Received = 0b");
Serial.print(msg, BIN); Serial.print(msg, BIN);
Serial.print(", 0x"); Serial.print(", 0x");
Serial.print(msg, HEX); Serial.print(msg, HEX);
Serial.print(", "); Serial.print(", ");
Serial.println(msg); Serial.println(msg);
// Next data frame that will be received by master
SPI.dev()->regs->DR = ++count;
} }