EmbeddedArtists AB / Mbed 2 deprecated lpc812_exp_solution_i2c

Solutions for the I2C experiments for LPC812 MAX

Dependencies:   mbed

main.cpp@0:9aab4157fdae, 2013-11-24 (annotated)

Committer:
embeddedartists
Date:
Sun Nov 24 12:34:47 2013 +0000
Revision:
0:9aab4157fdae
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:9aab4157fdae 1 #include "mbed.h"
embeddedartists 0:9aab4157fdae 2 #include "PCA9672.h"
embeddedartists 0:9aab4157fdae 3
embeddedartists 0:9aab4157fdae 4 PCA9672 ioxp(P0_10, P0_11); //I2C connected to PCA9672 in LPC800-MAX
embeddedartists 0:9aab4157fdae 5
embeddedartists 0:9aab4157fdae 6 Serial pc(USBTX, USBRX); // tx, rx
embeddedartists 0:9aab4157fdae 7
embeddedartists 0:9aab4157fdae 8 static void experiment1_alt1()
embeddedartists 0:9aab4157fdae 9 {
embeddedartists 0:9aab4157fdae 10 ioxp.frequency(100000);
embeddedartists 0:9aab4157fdae 11 ioxp.direction(0x80); // mark the push-button pin as input and the rest as outputs
embeddedartists 0:9aab4157fdae 12
embeddedartists 0:9aab4157fdae 13 while (1) {
embeddedartists 0:9aab4157fdae 14 uint8_t val = ioxp.read();
embeddedartists 0:9aab4157fdae 15 pc.printf("Reading 0x%02x - bit 7 is %d\n", val, val>>7);
embeddedartists 0:9aab4157fdae 16 if (val & 0x80)
embeddedartists 0:9aab4157fdae 17 {
embeddedartists 0:9aab4157fdae 18 ioxp.write(0x10);
embeddedartists 0:9aab4157fdae 19 }
embeddedartists 0:9aab4157fdae 20 else
embeddedartists 0:9aab4157fdae 21 {
embeddedartists 0:9aab4157fdae 22 ioxp.write(0x20);
embeddedartists 0:9aab4157fdae 23 }
embeddedartists 0:9aab4157fdae 24 wait(.50);
embeddedartists 0:9aab4157fdae 25 }
embeddedartists 0:9aab4157fdae 26 }
embeddedartists 0:9aab4157fdae 27
embeddedartists 0:9aab4157fdae 28 static void experiment1_alt2()
embeddedartists 0:9aab4157fdae 29 {
embeddedartists 0:9aab4157fdae 30 ioxp.frequency(100000);
embeddedartists 0:9aab4157fdae 31 ioxp.direction(0x80 | 0x20); // mark the push-button pins (on breadboard and onboard) as inputs
embeddedartists 0:9aab4157fdae 32
embeddedartists 0:9aab4157fdae 33 while (1) {
embeddedartists 0:9aab4157fdae 34 uint8_t val = ioxp.read();
embeddedartists 0:9aab4157fdae 35 pc.printf("Reading 0x%02x - bit 7 is %d, bit 5 is %d\n", val, (val>>7)&1, (val>>5)&1);
embeddedartists 0:9aab4157fdae 36 if (((val & 0xa0)==0xa0) || ((val & 0xa0)==0x00))
embeddedartists 0:9aab4157fdae 37 {
embeddedartists 0:9aab4157fdae 38 // both or neither buttons are pressed
embeddedartists 0:9aab4157fdae 39 ioxp.write(0x10);
embeddedartists 0:9aab4157fdae 40 }
embeddedartists 0:9aab4157fdae 41 else
embeddedartists 0:9aab4157fdae 42 {
embeddedartists 0:9aab4157fdae 43 // exactly one of the buttons are pressed
embeddedartists 0:9aab4157fdae 44 ioxp.write(0x00);
embeddedartists 0:9aab4157fdae 45 }
embeddedartists 0:9aab4157fdae 46 wait(.50);
embeddedartists 0:9aab4157fdae 47 }
embeddedartists 0:9aab4157fdae 48 }
embeddedartists 0:9aab4157fdae 49
embeddedartists 0:9aab4157fdae 50 int main()
embeddedartists 0:9aab4157fdae 51 {
embeddedartists 0:9aab4157fdae 52 //experiment1_alt1(); //onboard button controls yellow (pressed) and green (released) LEDs
embeddedartists 0:9aab4157fdae 53 experiment1_alt2(); //two buttons. Yellow LED lit with exactly one is pressed
embeddedartists 0:9aab4157fdae 54 }