Axel Utech / Mbed 2 deprecated Nucleo_i2c_pcf8574

Demo for PCF8574

Dependencies:   mbed

main.cpp@0:daf4d39b8c98, 2014-11-05 (annotated)

Committer:
aAXEe
Date:
Wed Nov 05 08:01:34 2014 +0000
Revision:
0:daf4d39b8c98
basic handling working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aAXEe 0:daf4d39b8c98 1 #include "mbed.h"
aAXEe 0:daf4d39b8c98 2
aAXEe 0:daf4d39b8c98 3 #define PCF8574_ADDR (0x40)
aAXEe 0:daf4d39b8c98 4
aAXEe 0:daf4d39b8c98 5 I2C i2c(I2C_SDA, I2C_SCL);
aAXEe 0:daf4d39b8c98 6
aAXEe 0:daf4d39b8c98 7
aAXEe 0:daf4d39b8c98 8 Serial pc(SERIAL_TX, SERIAL_RX);
aAXEe 0:daf4d39b8c98 9
aAXEe 0:daf4d39b8c98 10
aAXEe 0:daf4d39b8c98 11 bool pcf8574_write(uint8_t data){
aAXEe 0:daf4d39b8c98 12 return i2c.write(PCF8574_ADDR, (char*) &data, 1, 0) == 0;
aAXEe 0:daf4d39b8c98 13 }
aAXEe 0:daf4d39b8c98 14
aAXEe 0:daf4d39b8c98 15 bool pcf8574_read(uint8_t* data){
aAXEe 0:daf4d39b8c98 16 return i2c.read(PCF8574_ADDR, (char*) data, 1, 0) == 0;
aAXEe 0:daf4d39b8c98 17 }
aAXEe 0:daf4d39b8c98 18
aAXEe 0:daf4d39b8c98 19 int pcf8574_test(uint8_t value){
aAXEe 0:daf4d39b8c98 20 int ret;
aAXEe 0:daf4d39b8c98 21 uint8_t data=0;
aAXEe 0:daf4d39b8c98 22
aAXEe 0:daf4d39b8c98 23 ret = pcf8574_write(value);
aAXEe 0:daf4d39b8c98 24 if(!ret) return -1;
aAXEe 0:daf4d39b8c98 25
aAXEe 0:daf4d39b8c98 26 ret = pcf8574_read(&data);
aAXEe 0:daf4d39b8c98 27 if(!ret) return -2;
aAXEe 0:daf4d39b8c98 28
aAXEe 0:daf4d39b8c98 29 return data;
aAXEe 0:daf4d39b8c98 30 }
aAXEe 0:daf4d39b8c98 31
aAXEe 0:daf4d39b8c98 32 int main()
aAXEe 0:daf4d39b8c98 33 {
aAXEe 0:daf4d39b8c98 34
aAXEe 0:daf4d39b8c98 35 printf("Hello PCF8574\n");
aAXEe 0:daf4d39b8c98 36 while (1) {
aAXEe 0:daf4d39b8c98 37 pc.printf("pcf8574_test: low: %i\n", pcf8574_test(0x00));
aAXEe 0:daf4d39b8c98 38 wait(0.5);
aAXEe 0:daf4d39b8c98 39 pc.printf("pcf8574_test: high: %i\n", pcf8574_test(0xff));
aAXEe 0:daf4d39b8c98 40 wait(0.5);
aAXEe 0:daf4d39b8c98 41 }
aAXEe 0:daf4d39b8c98 42
aAXEe 0:daf4d39b8c98 43 }
aAXEe 0:daf4d39b8c98 44
aAXEe 0:daf4d39b8c98 45