Other Parts Discussed in Thread: CONTROLSUITE
I am trying to read values from Magnetic Encoder using the IC2. So far no luck. Take a look at my code let me know if you see where I have gone wrong. Thanks
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
///////// Init for I2C comm. /////////////
void I2CA_Init(void);
void InitI2CGpio(void);
void I2CA_WriteData(void);
int32 Result;
#define I2C_SLAVE_ADDR 0xFE
#define I2C_NUMBYTES 2
Uint32 write_data[2];
Uint16 Count = 0;
void main(void)
{
InitI2CGpio(); // Init GPIO
I2CA_Init(); // Init I2C
for(;;)
{
I2CA_WriteData();
Count++;
}
}
/////////////////// I2C INIT ///////////////////////////
void I2CA_Init(void)
{
I2caRegs.I2CMDR.all = 0x0000; // put I2C module in reset mode
I2caRegs.I2CPSC.all = 9; // prescaler
I2caRegs.I2CCLKL = 10; // clock-low period, MUST BE NON-ZERO
I2caRegs.I2CCLKH = 5; // clock-high period, MUST BE NON-ZERO
I2caRegs.I2CMDR.all = 0x0020; // take I2C out of reset, stop I2C when emulation is suspended
I2caRegs.I2CFFTX.all = 0x6000; // enable FIFO mode and TX_FIFO
I2caRegs.I2CFFRX.all = 0x2040; // enable RX_FIFO, clear RXFFINT,
return;
}
/////////////////// GPIO INIT ////////////////////////
void InitI2CGpio(void)
{
EALLOW;
GpioCtrlRegs.GPBMUX1.bit.GPIO32 = 1; // Configure GPIO32 for SDAA operation
GpioCtrlRegs.GPBMUX1.bit.GPIO33 = 1; // Configure GPIO33 for SCLA operation
GpioCtrlRegs.GPBPUD.bit.GPIO32 = 0; // Enable pull-up for GPIO32 (SDAA)
GpioCtrlRegs.GPBPUD.bit.GPIO33 = 0; // Enable pull-up for GPIO33 (SCLA)
GpioCtrlRegs.GPBQSEL1.bit.GPIO32 = 3; // Asynch input GPIO32 (SDAA)
GpioCtrlRegs.GPBQSEL1.bit.GPIO33 = 3; // Asynch input GPIO33 (SCLA)
EDIS;
}
/////////////////////// Read/Write I2C //////////
void I2CA_WriteData(void)
{
unsigned int i; // counter
while(I2caRegs.I2CMDR.bit.STP == 1) {} // wait until the STP bit is cleared from any previous master communication
while(I2caRegs.I2CSTR.bit.BB == 1) {} // wait until bus not busy
I2caRegs.I2CSAR = I2C_SLAVE_ADDR; // slave address register set
I2caRegs.I2CCNT = I2C_NUMBYTES ; // setup number of bytes to send
for(i = 0; i < 2; i++) // setup data to send, # of bytes equals num_bytes
{
I2caRegs.I2CDXR = (unsigned int)(write_data[i]); // write data into Data Transmit FIFO
}
Result = ((unsigned int)(write_data[0] << 8 | write_data[1]));
return; // end of function, return value is void
}
