Rob Toulson / Mbed 2 deprecated PE_07-03_SPISlave

by Rob Toulson and Tim Wilmshurst from textbook "Fast and Effective Embedded Systems Design: Applying the ARM mbed"

Dependencies:   mbed

main.cpp@0:c3cbfdffbac1, 2012-10-15 (annotated)

Committer:
robt
Date:
Mon Oct 15 21:25:05 2012 +0000
Revision:
0:c3cbfdffbac1
by Rob Toulson and Tim Wilmshurst from textbook "Fast and Effective Embedded Systems Design: Applying the ARM mbed"

Who changed what in which revision?

UserRevisionLine numberNew contents of line
robt 0:c3cbfdffbac1 1 /*Program Example 7.3: Sets the mbed up as Slave, and exchanges data with a Master, sending its own switch positions, and displaying those of the Master. as SPI slave.
robt 0:c3cbfdffbac1 2 */
robt 0:c3cbfdffbac1 3 #include "mbed.h"
robt 0:c3cbfdffbac1 4 SPISlave ser_port(p11,p12,p13,p14); // mosi, miso, sclk, ssel
robt 0:c3cbfdffbac1 5 DigitalOut red_led(p25); //red led
robt 0:c3cbfdffbac1 6 DigitalOut green_led(p26); //green led
robt 0:c3cbfdffbac1 7 DigitalIn switch_ip1(p5);
robt 0:c3cbfdffbac1 8 DigitalIn switch_ip2(p6);
robt 0:c3cbfdffbac1 9 char switch_word ; //word we will send
robt 0:c3cbfdffbac1 10 char recd_val; //value received from master
robt 0:c3cbfdffbac1 11
robt 0:c3cbfdffbac1 12 int main() {
robt 0:c3cbfdffbac1 13 //default formatting applied
robt 0:c3cbfdffbac1 14 while(1) {
robt 0:c3cbfdffbac1 15 //set up switch_word from switches that are pressed
robt 0:c3cbfdffbac1 16 switch_word=0xa0; //set up a recognisable output pattern
robt 0:c3cbfdffbac1 17 if (switch_ip1==1)
robt 0:c3cbfdffbac1 18 switch_word=switch_word|0x01;
robt 0:c3cbfdffbac1 19 if (switch_ip2==1)
robt 0:c3cbfdffbac1 20 switch_word=switch_word|0x02;
robt 0:c3cbfdffbac1 21
robt 0:c3cbfdffbac1 22 if(ser_port.receive()) { //test if data transfer has occurred
robt 0:c3cbfdffbac1 23 recd_val = ser_port.read(); // Read byte from master
robt 0:c3cbfdffbac1 24 ser_port.reply(switch_word); // Make this the next reply
robt 0:c3cbfdffbac1 25 }
robt 0:c3cbfdffbac1 26
robt 0:c3cbfdffbac1 27 //set leds according to incoming word from slave
robt 0:c3cbfdffbac1 28 red_led=0; //preset both to 0
robt 0:c3cbfdffbac1 29 green_led=0;
robt 0:c3cbfdffbac1 30 recd_val=recd_val&0x03; //AND out unwanted bits
robt 0:c3cbfdffbac1 31 if (recd_val==1)
robt 0:c3cbfdffbac1 32 red_led=1;
robt 0:c3cbfdffbac1 33 if (recd_val==2)
robt 0:c3cbfdffbac1 34 green_led=1;
robt 0:c3cbfdffbac1 35 if (recd_val==3){
robt 0:c3cbfdffbac1 36 red_led=1;
robt 0:c3cbfdffbac1 37 green_led=1;
robt 0:c3cbfdffbac1 38 }
robt 0:c3cbfdffbac1 39 }
robt 0:c3cbfdffbac1 40 }
robt 0:c3cbfdffbac1 41