FC_IO_I2C Class Reference

I2C Master. More...

Inheritance diagram for FC_IO_I2C:

Public Member Functions
	FC_IO_I2C (int bitrate=400000, int fifo_depth=16)
int	WaitReady ()
bool	IsReady ()
bool	IsAddressAck ()
bool	StartWrite (U32 addr, const U8 *pD, int nD)
bool	StartWrite (U32 addr, U8 d)
bool	ContinueWrite (U32 addr, const U8 *pD, int nD)
bool	StartRead (U32 addr, int nD)
bool	ContinueRead (U32 addr, int nD)
bool	GetReadData (U8 *pD, int nD)
U8	GetNext ()
U32	GetNumValid ()
U32	GetNumReady ()
void	ResetReadFIFO ()

Detailed Description

I2C Master.

Adds to interface:
<name>_SCL : inout std_logic;
<name>_SDA : inout std_logic
where <name> is c++ object name.
Any number of instances are allowed.

// This example show how to use FC_IO_I2C class to read data from an I2C device.
// The I2C device in this example is ADT7420. First it reads the the device id.
// Then it reads the temperature every second. The id and temperature with 1 decimal
// is printed on an UART. The temperature in Celsius.
 
#include <stdlib.h>
#include "fc_io.h"
#include "fc_system.h"
 
// Function to stream an int
template<class T>
T& operator<<(T& os, int v) 
{
    char b[16];
    itoa(v,b,10);
    os << b;
    return os;
} 
 
int main(void)
{
//% hw_begin
    FC_IO_Clk Clk(100); 
    FC_IO_UART_TX uart_tx(115200,64);
    FC_IO_I2C temp_sens(400000);    // 400 kbps
    FC_System_Timer timer;
//% hw_end
 
    // Read ADT7420 ID
    // The ADT7420 has I2C address 0x4B and id reg is 0x0b   
    temp_sens.StartWrite(0x4B,0x0B);
    temp_sens.ContinueRead(0x4B,1); // Repeat start
    temp_sens.WaitReady();
 
    if( temp_sens.IsAddressAck())
        uart_tx << "ADT7420 Id:" << int(temp_sens.GetNext()) << "\r\n";
    else
        uart_tx << "0x4B Addr not ok\r\n";
 
    for(;;)
    {
        timer.Sleep(1000, TU_ms);
        // Read temperature
        temp_sens.StartWrite(0x4B,0x00);
        temp_sens.ContinueRead(0x4B,2);
        temp_sens.WaitReady();
        int t = (temp_sens.GetNext() << 8); // MSB read first
        t |= temp_sens.GetNext();           
        t *= 10;                // Make t in 0.1 deg
        t >>= (3+4);            // Default 13 bit mode
        uart_tx << "Temp: " << t/10 << "." << t%10 << "\r\n";
    }  
}