mbed_example / Mbed OS SPI_HelloWorld

SPI Hello World

Fork of SPI_HelloWorld_Mbed by Mbed

Note

You will need to redefine the SPI pins to match the pins on your board to run this example. The pin mapping can be found on the board's Platform page.

API

API reference

Import librarymbed

No documentation found.

main.cpp@0:466ad3f38b6b, 2013-02-12 (annotated)

Committer:
mbed_official
Date:
Tue Feb 12 17:25:49 2013 +0000
Revision:
0:466ad3f38b6b
Child:
2:34bd7b8d30f9
SPI Hello World

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:466ad3f38b6b 1 #include "mbed.h"
mbed_official 0:466ad3f38b6b 2
mbed_official 0:466ad3f38b6b 3 SPI spi(p5, p6, p7); // mosi, miso, sclk
mbed_official 0:466ad3f38b6b 4 DigitalOut cs(p8);
mbed_official 0:466ad3f38b6b 5
mbed_official 0:466ad3f38b6b 6 int main() {
mbed_official 0:466ad3f38b6b 7 // Chip must be deselected
mbed_official 0:466ad3f38b6b 8 cs = 1;
mbed_official 0:466ad3f38b6b 9
mbed_official 0:466ad3f38b6b 10 // Setup the spi for 8 bit data, high steady state clock,
mbed_official 0:466ad3f38b6b 11 // second edge capture, with a 1MHz clock rate
mbed_official 0:466ad3f38b6b 12 spi.format(8,3);
mbed_official 0:466ad3f38b6b 13 spi.frequency(1000000);
mbed_official 0:466ad3f38b6b 14
mbed_official 0:466ad3f38b6b 15 // Select the device by seting chip select low
mbed_official 0:466ad3f38b6b 16 cs = 0;
mbed_official 0:466ad3f38b6b 17
mbed_official 0:466ad3f38b6b 18 // Send 0x8f, the command to read the WHOAMI register
mbed_official 0:466ad3f38b6b 19 spi.write(0x8F);
mbed_official 0:466ad3f38b6b 20
mbed_official 0:466ad3f38b6b 21 // Send a dummy byte to receive the contents of the WHOAMI register
mbed_official 0:466ad3f38b6b 22 int whoami = spi.write(0x00);
mbed_official 0:466ad3f38b6b 23 printf("WHOAMI register = 0x%X\n", whoami);
mbed_official 0:466ad3f38b6b 24
mbed_official 0:466ad3f38b6b 25 // Deselect the device
mbed_official 0:466ad3f38b6b 26 cs = 1;
mbed_official 0:466ad3f38b6b 27 }