MCP.cpp

00001 #include "MCP.h"
00002 #include "mbed.h"
00003 #include "MCP23017.h"
00004 
00005 MCP::MCP(PinName sda, PinName scl, uint8_t device_address)
00006     :i2c(sda, scl), mcp(i2c, device_address) 
00007 {
00008     _iodir_data.all = 0xffff;
00009     _pull_data.all  = 0xffff;
00010     _read_data.all  = 0x0000;
00011     _write_data.all = 0x0000;
00012 }
00013 
00014 void MCP::PinMode(uint8_t pin, pin_mode mode)
00015 {
00016     if(mode == OUTPUT) {
00017         _iodir_data.all &= ~(0x0001 << pin);
00018     } else if(mode == INPUT) {
00019         _iodir_data.all |= (0x0001 << pin);
00020     } else if(mode == INPUT_PULLUP) {
00021         _iodir_data.all |= (0x0001 << pin);
00022         _pull_data.all |= (0x0001 << pin);
00023     }
00024 }
00025 
00026 void MCP::Write(uint8_t pin, bool signal)
00027 {
00028     if(signal == 1) {
00029         _write_data.all |= (0x0001 << pin);
00030     } else {
00031         _write_data.all &= ~(0x0001 << pin);
00032     }
00033 }
00034 
00035 bool MCP::Read(uint8_t pin)
00036 {
00037     return (_read_data.all >> pin) & 0x01;
00038 }
00039         
00040 void MCP::Update(void) {
00041     i2c.frequency(100000);
00042     char data[2] = {GPPUA, 0xff};
00043     int lost = i2c.write(0x40, data, 2);
00044     if(lost) {
00045         i2c.start();
00046     }
00047     mcp.direction(PORT_A, _iodir_data.port.port_A);
00048     mcp.direction(PORT_B, _iodir_data.port.port_B);
00049     mcp.configurePullUps(PORT_A, _pull_data.port.port_A);
00050     mcp.configurePullUps(PORT_B, _pull_data.port.port_B);
00051     _read_data.port.port_A = mcp.read(PORT_A);
00052     _read_data.port.port_B = mcp.read(PORT_B);
00053     mcp.write(PORT_A, _write_data.port.port_A);
00054     mcp.write(PORT_B, _write_data.port.port_B);
00055     
00056 }
00057