Good Day,
I am trying to get the SCI on a TMS320F28035 control card (DRV8301-HC-C2-Kit) to transmit data to an arduino uno to display some information. I am using an FTDI adapter connected to GPIO28 and GPIO29 and the arduino serial window. I am trying to write data from the CCS debug window to the SCITXBUF register to make sure the same data is being sent. I have selected the same baud rate but all I get is a weird looking Z.
See below for the SCI functions.
I suspect it may be the JTAG that is giving the problem but I am not sure.
Any assistance on how to go about testing the SCI and ensuring the data is sent accurately would be appreciated.
Regards,
Christian,
unsigned char SCIDataAvailable()
{
return ((SciaRegs.SCIFFRX.all & 0x1F00)!=0);
}
// ******************************************************
// unsigned char SCIReceiveByte()
//
// This function is used to receive a single byte from
// serial ports receive fifo buffer.
//
// Return values:
// The first (oldest) byte in the fifo buffer
// ******************************************************
unsigned char SCIReceiveByte()
{
return SciaRegs.SCIRXBUF.all;
}
// ******************************************************
// void SCITransmitByte(unsigned char data)
//
// This function is used to transmit a single byte on
// the serial port.
//
// Parameters:
// data: The byte to transmit.
// ******************************************************
void SCITransmitByte(unsigned char data)
{
//1. If the fifo buffer is full we should wait
while((SciaRegs.SCIFFTX.all &0x1F00)>0x0300) ;
//kickdog();
//2. Write the data byte to the fifo buffer
SciaRegs.SCITXBUF=data;
}
void InitSciaGpio()
{
EALLOW;
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.
GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0; // Enable pull-up for GPIO28 (SCIRXDA)
GpioCtrlRegs.GPAPUD.bit.GPIO29 = 0; // Enable pull-up for GPIO29 (SCITXDA)
/* Set qualification for selected pins to asynch only */
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.
GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3; // Asynch input GPIO28 (SCIRXDA)
// GpioCtrlRegs.GPAQSEL1.bit.GPIO7 = 3; // Asynch input GPIO7 (SCIRXDA)
/* Configure SCI-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SCI functional pins.
GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1; // Configure GPIO28 for SCIRXDA operation
GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1; // Configure GPIO29 for SCITXDA operation
EDIS;
}
void SetupSerialPort()
{
// *** Calculate the BRR ***
//
// LSPLK
// BRR = ---------------------------------- - 1
// 8*BAUDRATE
UINT32 BRR = (15000000UL)/(115200<<3)-1; //Low speed clock = 15 MHz, baudrate = 115200 baud
InitSciaGpio();
SciaRegs.SCICTL1.all=0x0003; // Reset SCI enable RX and TX
SciaRegs.SCIFFCT.all=0x0000; // SCI FIFO Control (SCIFFCT) Register
// No transfer delay or auto detect baud
SciaRegs.SCIFFTX.all=0xE000; // Enable transmit FIFO opeRATIONS
SciaRegs.SCIFFRX.all=0x2000; // Enable receive FIFO operations
SciaRegs.SCICTL2.all=0x0000; //disable interrupts
// Set the baud rate
SciaRegs.SCIHBAUD=(UINT16)(BRR>>8) & 0x00FF;
SciaRegs.SCILBAUD=(UINT16)BRR & 0x00FF;
SciaRegs.SCIPRI.all=0x0018; //SCI Priority Control Register
//Complete current receive/transmit sequence before stopping
SciaRegs.SCICCR.all=0x0007; // SCI Communication Control Register
//8 bit character length, No parity, 1 stop bit
SciaRegs.SCICTL1.all=0x0023; // Enable the SCI
}
