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Dependencies:   USBDevice mbed

Fork of SPI_HelloWorld_Mbed by mbed official

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:bae323a425ec
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 }