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Hardware
// Configure Pins
pstGPIO->gp[0].GP_CTL |=
0x0000C000;
// Disable Control Register
I2C->I2CR = 0x00;
// Set slowest I2C bus speed possible
I2C->IFDR = 0x3f;
// Set address
I2C->IADR = (d_addr << 1) | 0x08;
// Enable Control Register
I2C->I2CR = 0x80;
return 0;
}
/******************************************************************************
I2C_STATUS()
Check if I2C is initialized
ARGS:
(None.)
RTNS:
0 = Down
1 = Up
******************************************************************************/
int I2C_STATUS()
{
i2c_map_t* I2C = (i2c_map_t*) I2C_BASE;
if (I2C->I2CR & 0x80)
{ return 1; }
return 0;
}
/******************************************************************************
I2C_RX()
Receive number of bytes from the bus.
ARGS:
*data : Data buffer for received
cnt : Number of bytes to read
RTNS:
Number of bytes received successfully.
******************************************************************************/
int I2C_RX(unsigned char *data, int cnt)
{
i2c_map_t* I2C = (i2c_map_t*) I2C_BASE;
int x = 0;
// Receive mode
I2C->I2CR &= ~0x0010;
// Set or clear Ack control before dummy read
if (cnt > 1)
{ I2C->I2CR &= ~0x0008; }
else
{ I2C->I2CR |= 0x0008; }
MSC711x Packet Telephony Farm Card (SPT711xPFCE), Rev. 1
16
Freescale Semiconductor
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