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Dependencies:   MODSERIAL mbed

MCP23008/MCP23008.cpp@6:c980535393ed, 2018-03-07 (annotated)

Committer:
jrodenburg
Date:
Wed Mar 07 18:50:10 2018 +0000
Revision:
6:c980535393ed
Parent:
5:0f38a0bd4f86
Child:
7:8a5e65e63e2a
Most recent code, running on test rack.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jrodenburg 0:a28a1035c31b 1 #include "mbed.h"
jrodenburg 0:a28a1035c31b 2 #include "MCP23008.h"
jrodenburg 0:a28a1035c31b 3 #include "MODSERIAL.h"
jrodenburg 0:a28a1035c31b 4
jrodenburg 0:a28a1035c31b 5 MODSERIAL pc2(USBTX, USBRX);
jrodenburg 0:a28a1035c31b 6
jrodenburg 0:a28a1035c31b 7 namespace {
jrodenburg 0:a28a1035c31b 8 const uint8_t I2C_WRITE = 0x00;
jrodenburg 0:a28a1035c31b 9 const uint8_t I2C_READ = 0x01;
jrodenburg 0:a28a1035c31b 10
jrodenburg 0:a28a1035c31b 11 /* MCP23008 registers */
jrodenburg 0:a28a1035c31b 12 const uint8_t IODIR = 0x00;
jrodenburg 0:a28a1035c31b 13 const uint8_t GPIO = 0x09;
jrodenburg 5:0f38a0bd4f86 14 const uint8_t PULLUP = 0x06;
jrodenburg 0:a28a1035c31b 15
jrodenburg 0:a28a1035c31b 16 //Channel addresses
jrodenburg 0:a28a1035c31b 17 const uint8_t CHNL_0 = 0x01;
jrodenburg 0:a28a1035c31b 18 const uint8_t CHNL_1 = 0x02;
jrodenburg 0:a28a1035c31b 19 const uint8_t CHNL_2 = 0x04;
jrodenburg 0:a28a1035c31b 20 const uint8_t CHNL_3 = 0x08;
jrodenburg 0:a28a1035c31b 21 };
jrodenburg 0:a28a1035c31b 22
jrodenburg 0:a28a1035c31b 23 MCP23008::MCP23008 (PinName sda, PinName scl, uint8_t address, int freq): i2c( sda, scl ){
jrodenburg 0:a28a1035c31b 24 addrI2C = address;
jrodenburg 0:a28a1035c31b 25 i2c.frequency(freq);
jrodenburg 0:a28a1035c31b 26 }
jrodenburg 0:a28a1035c31b 27
jrodenburg 0:a28a1035c31b 28 void MCP23008::setAddress(int address){
jrodenburg 0:a28a1035c31b 29 addrI2C = address;
jrodenburg 0:a28a1035c31b 30 }
jrodenburg 0:a28a1035c31b 31
jrodenburg 1:0182b86f9bd4 32 void MCP23008::writeOutput(int chn1, int chn2, int chn3, int chn4){
jrodenburg 0:a28a1035c31b 33 char data[2];
jrodenburg 5:0f38a0bd4f86 34 char data2[2];
jrodenburg 1:0182b86f9bd4 35 uint8_t val = 0x00;
jrodenburg 1:0182b86f9bd4 36
jrodenburg 1:0182b86f9bd4 37 //Create mask for all bits that should be on
jrodenburg 1:0182b86f9bd4 38 if(chn1) val = val | CHNL_0;
jrodenburg 1:0182b86f9bd4 39 if(chn2) val = val | CHNL_1;
jrodenburg 1:0182b86f9bd4 40 if(chn3) val = val | CHNL_2;
jrodenburg 1:0182b86f9bd4 41 if(chn4) val = val | CHNL_3;
jrodenburg 0:a28a1035c31b 42
jrodenburg 1:0182b86f9bd4 43 data[0] = GPIO; //register address
jrodenburg 1:0182b86f9bd4 44 data[1] = val; //GPIO bit map
jrodenburg 5:0f38a0bd4f86 45 data2[0] = PULLUP;
jrodenburg 5:0f38a0bd4f86 46 data2[1] = 0x00;
jrodenburg 1:0182b86f9bd4 47
jrodenburg 5:0f38a0bd4f86 48 i2c.write((addrI2C<<1)|(I2C_WRITE), data, 2);
jrodenburg 5:0f38a0bd4f86 49 i2c.write((addrI2C<<1)|(I2C_WRITE), data2, 2);
jrodenburg 6:c980535393ed 50 wait(0.2);
jrodenburg 0:a28a1035c31b 51 }
jrodenburg 0:a28a1035c31b 52
jrodenburg 0:a28a1035c31b 53 void MCP23008::init(){
jrodenburg 0:a28a1035c31b 54 char io_setup[2];
jrodenburg 0:a28a1035c31b 55
jrodenburg 0:a28a1035c31b 56 io_setup[0] = IODIR;
jrodenburg 0:a28a1035c31b 57 io_setup[1] = 0x00; //turn all pins to outputs
jrodenburg 0:a28a1035c31b 58
jrodenburg 0:a28a1035c31b 59 i2c.write((addrI2C<<1)|(I2C_WRITE), io_setup, 2);
jrodenburg 6:c980535393ed 60 wait(0.2);
jrodenburg 0:a28a1035c31b 61
jrodenburg 0:a28a1035c31b 62 //Set all outputs to off
jrodenburg 0:a28a1035c31b 63 GPIO_Pin_Status = 0x00;
jrodenburg 0:a28a1035c31b 64 }