Jack Occleshaw / Mbed 2 deprecated w4-spidatalinkmaster

w4spidatalinkmaster

Dependencies:   mbed

main.cpp@0:c912ef4f5206, 2017-01-12 (annotated)

Committer:
occle
Date:
Thu Jan 12 15:45:25 2017 +0000
Revision:
0:c912ef4f5206
w4spidatalinkmaster

Who changed what in which revision?

UserRevisionLine numberNew contents of line
occle 0:c912ef4f5206 1 /*Sets the mbed up as Master, and exchanges data with a slave, sending its own switch positions, and displaying those of the slave.*/
occle 0:c912ef4f5206 2 #include "mbed.h"
occle 0:c912ef4f5206 3 SPI ser_port(PTD2, PTD3, PTD1); //mosi, miso, sclk
occle 0:c912ef4f5206 4 DigitalOut red_led(LED1); //red led
occle 0:c912ef4f5206 5 DigitalOut green_led(LED2); //green led
occle 0:c912ef4f5206 6 DigitalOut cs(PTC16); //this acts as “slave select”
occle 0:c912ef4f5206 7 DigitalIn switch_ip1(SW2);
occle 0:c912ef4f5206 8 DigitalIn switch_ip2(SW3);
occle 0:c912ef4f5206 9 char switch_word ; //word we will send
occle 0:c912ef4f5206 10 char recd_val; //value return from slave
occle 0:c912ef4f5206 11
occle 0:c912ef4f5206 12 int main() {
occle 0:c912ef4f5206 13 while (1){
occle 0:c912ef4f5206 14 //Default settings for SPI Master chosen, no need for further configuration
occle 0:c912ef4f5206 15 //Set up the word to be sent, by testing switch inputs
occle 0:c912ef4f5206 16 switch_word=0xa0; //set up a recognizable output pattern
occle 0:c912ef4f5206 17 if (switch_ip1==0)
occle 0:c912ef4f5206 18 switch_word=switch_word|0x01; //OR in lsb, check if the botton is pressed
occle 0:c912ef4f5206 19 if (switch_ip2==0)
occle 0:c912ef4f5206 20 switch_word=switch_word|0x02; //OR in next lsb, check if the botton is pressed
occle 0:c912ef4f5206 21 cs = 0; //select slave ("active low")
occle 0:c912ef4f5206 22 recd_val=ser_port.write(switch_word); //send switch_word and receive data. set a initial value for recd_val (dummy)
occle 0:c912ef4f5206 23 cs = 1;
occle 0:c912ef4f5206 24 wait(0.01);//wait for slave to response
occle 0:c912ef4f5206 25 //set leds according to incoming word from slave
occle 0:c912ef4f5206 26 red_led=1; //preset both to off
occle 0:c912ef4f5206 27 green_led=1;
occle 0:c912ef4f5206 28 recd_val=recd_val&0x03; //AND out unwanted bits
occle 0:c912ef4f5206 29 if (recd_val==1)
occle 0:c912ef4f5206 30 {red_led=0; //red on, green off
occle 0:c912ef4f5206 31 green_led=1;}
occle 0:c912ef4f5206 32 if (recd_val==2)
occle 0:c912ef4f5206 33 {red_led=1; //red off, green on
occle 0:c912ef4f5206 34 green_led=0;}
occle 0:c912ef4f5206 35 if (recd_val==3){
occle 0:c912ef4f5206 36 red_led=0; //both on
occle 0:c912ef4f5206 37 green_led=0;
occle 0:c912ef4f5206 38 }
occle 0:c912ef4f5206 39 }
occle 0:c912ef4f5206 40 }