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| Class | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Name | transfer() |
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| Examples |
import processing.io.*;
SPI adc;
void setup() {
//printArray(SPI.list());
adc = new SPI(SPI.list()[0]);
adc.settings(500000, SPI.MSBFIRST, SPI.MODE0);
}
void draw() {
// read in values over SPI from an analog-to-digital
// converter
// dummy write, actual values don't matter
byte[] out = { 0, 0 };
byte[] in = adc.transfer(out);
// some input bit shifting according to the datasheet
int val = ((in[0] & 0x1f) << 5) | ((in[1] & 0xf8) >> 3);
// val is between 0 and 1023
println(val);
}
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| Description |
Transfers data over the SPI bus With SPI, data is simultaneously being exchanged between the master device and the slave device. For every byte that is being sent out, there's also one byte being read in. |
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| Syntax | .transfer(out) | ||||||||
| Parameters |
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| Returns | byte[] |
