SPI.setClockDivider()
Sets the SPI clock divider relative to the system clock.
Syntax
SPI.setClockDivider(divider)
Parameters
divider:
The maximum SPI clock speed.
Available speeds:
SPI_CLOCK_DIV2: SPI clock to 8000000 (8 Mhz)
SPI_CLOCK_DIV4: SPI clock to 4000000 (4 Mhz)
SPI_CLOCK_DIV8: SPI clock to 2000000 (2 Mhz)
SPI_CLOCK_DIV16: SPI clock to 1000000 (1 Mhz)
SPI_CLOCK_DIV32: SPI clock to 500000 (500 khz)
SPI_CLOCK_DIV64: SPI clock to 250000 (250 khz)
SPI_CLOCK_DIV128: SPI clock to 125000 (125 khz)
Returns
None
Example
Javascript
const linuxduino = require('linuxduino');
// Testing SPI separate settings
(async() => {
// Wait for wasm file
await linuxduino.ready;
// Open SPI port
SPI = new linuxduino.SPI();
SPI.begin("/dev/spidev0.0");
// Set SPI Settings
SPI.setClockDivider(linuxduino.SPI_CLOCK_DIV64);
SPI.setBitOrder(linuxduino.MSBFIRST);
SPI.setDataMode(linuxduino.SPI_MODE3);
// Send Hello World! every second
buff = Buffer.from("Hello World!\n");
var ret;
while(1) {
// Note in SPI the last character will not be printed here.
// In SPI you recieve what you sent previously.
for(var i=0; i<buff.length; i++) {
ret = SPI.transfer(buff[i]); // Transmit and receive one byte
process.stdout.write(String.fromCharCode(ret));
}
process.stdout.write('\n');
linuxduino.delay(1000); // delay 1 sec.
}
SPI.end();
})();
Run it
sudo node spi_setSettings.js
C++
#include "Linuxduino.h"
// Testing SPI separate settings
int main(void) {
char ret;
// Open SPI port
SPI.begin("/dev/spidev0.0");
// Set SPI Settings
SPI.setClockDivider(SPI_CLOCK_DIV64);
SPI.setBitOrder(MSBFIRST);
SPI.setDataMode(SPI_MODE3);
// Send Hello World! every second
while(1) {
// Note in SPI the last character will not be printed here.
// In SPI you recieve what you sent previously.
for (const char *p = "Hello World!\n" ; *p!=0 ; p++) {
ret = SPI.transfer(*p); // Transmit and receive one byte
printf("%c", ret);
}
printf("\n");
delay(1000); // delay 1 sec.
}
SPI.end();
return 0;
}
Run it
g++ spi_setSettings.cpp -o spi_setSettings -llxduino
sudo ./spi_setSettings