SPI - Read and Write Data

Materials

AmebaD [ AMB23 / AMB21 / AMB22 / BW16 / BW16-TypeC ] x 1
Arduino UNO x 1

Example

SPI is a fast and robust communication protocol that are commonly found on many microcontrollers and is often used to retrieve sensor data or output image signal to a display.

AMB21/AMB22

Unit	CLK	MISO	MOSI	CS
	PB_20	PB_19	PB_18	PB_21
1	PB_6	PB_5	PB_4	PB_7

AMB23

Unit	CLK	MISO	MOSI	CS
1	PA_14	PA_13	PA_12	PA_15

BW16/BW16-TypeC

Unit	CLK	MISO	MOSI	CS
1	PA_14	PA_13	PA_12	PA_15

Code

First, upload the code below into Arduino UNO.

#include

volatile boolean received;

volatile byte receivedData;

ISR (SPI_STC_vect) //Interrupt routine function

{

receivedData = SPDR; // Get the received data from SPDR register

received = true; // Sets received as True

}

void setup()

{

Serial.begin(115200);

pinMode(MISO,OUTPUT); //Sets MISO as OUTPUT

SPCR |= _BV(SPE); //Turn on SPI in Slave Mode

received = false;

SPI.attachInterrupt(); //Activate SPI Interrupt

}

void loop()

{

if(received) {

SPDR = receivedData; // send back the received data, this is not necessary, only for demo purpose

received = false;

Serial.println(receivedData, HEX);

}

#include volatile boolean received; volatile byte receivedData; ISR (SPI_STC_vect) //Interrupt routine function { receivedData = SPDR; // Get the received data from SPDR register received = true; // Sets received as True } void setup() { Serial.begin(115200); pinMode(MISO,OUTPUT); //Sets MISO as OUTPUT SPCR |= _BV(SPE); //Turn on SPI in Slave Mode received = false; SPI.attachInterrupt(); //Activate SPI Interrupt } void loop() { if(received) { SPDR = receivedData; // send back the received data, this is not necessary, only for demo purpose received = false; Serial.println(receivedData, HEX); } }

#include
volatile boolean received;
volatile byte receivedData;

ISR (SPI_STC_vect)        //Interrupt routine function 
{
  receivedData = SPDR;   // Get the received data from SPDR register
  received = true;       // Sets received as True 
}

void setup()
{
  Serial.begin(115200);

  pinMode(MISO,OUTPUT);   //Sets MISO as OUTPUT
  SPCR |= _BV(SPE);       //Turn on SPI in Slave Mode
  received = false;
  SPI.attachInterrupt();  //Activate SPI Interrupt
}


void loop()
{ 
  if(received) {                        
    SPDR = receivedData;    // send back the received data, this is not necessary, only for demo purpose
    received = false;
    Serial.println(receivedData, HEX);
  }
}

Then on the Ameba board copy and paste the following code line by line into REPL to see their effects.

from machine import SPI

spi = SPI(0) # Only support 2 sets of SPI -- 0 or 1

spi.write(b"123") # Write number 123, and don't care about received data

spi.read(8, 0x42) # Read 8 bytes while writing 0x42 for each byte

from machine import SPI spi = SPI(0) # Only support 2 sets of SPI -- 0 or 1 spi.write(b"123") # Write number 123, and don't care about received data spi.read(8, 0x42) # Read 8 bytes while writing 0x42 for each byte

from machine import SPI
spi = SPI(0) # Only support 2 sets of SPI -- 0 or 1
spi.write(b"123") # Write number 123, and don't care about received data
spi.read(8, 0x42) # Read 8 bytes while writing 0x42 for each byte

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SPI - Read and Write Data

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