Hi colleagues,
Hope anybody can help me.
I work with the TMX320F28377D and try to implement a SCI to work with PC. I did a lot of different examples. The current one is the Example (without Interupts)about AutobaudLock and I have always the same problem: I receive all the sendet chars but RXRDY can't be set,the value of RXFFST is changed.
I can't insert the screen capture of ccs debug.
Occurrence:
PC stop :while(SciaRegs.SCIRXST.bit.RXRDY != 1) { }
Expressions : SciaRegs.SCIFFRX.bit.RXFFST = 9 ;
SciaRegs.SCIRXBUF.bit.SAR = 'A';
Why?
The code :
void main(void)
{
Uint16 ReceivedChar;
char *msg;
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the F2837xD_SysCtrl.c file.
InitSysCtrl();
// Step 2. Initialize GPIO:
// This example function is found in the F2837xD_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
InitGpio();
// For this example, only init the pins for the SCI-A port.
// GPIO_SetupPinMux() - Sets the GPxMUX1/2 and GPyMUX1/2 register bits
// GPIO_SetupPinOptions() - Sets the direction and configuration of the GPIOS
// These functions are found in the F2837xD_Gpio.c file.
GPIO_SetupPinMux(28, GPIO_MUX_CPU1, 1);
GPIO_SetupPinOptions(28, GPIO_INPUT, GPIO_PUSHPULL);
GPIO_SetupPinMux(29, GPIO_MUX_CPU1, 1);
GPIO_SetupPinOptions(29, GPIO_OUTPUT, GPIO_ASYNC);
// Step 3. Clear all __interrupts and initialize PIE vector table:
// Disable CPU __interrupts
DINT;
// Initialize PIE control registers to their default state.
// The default state is all PIE __interrupts disabled and flags
// are cleared.
// This function is found in the F2837xD_PieCtrl.c file.
InitPieCtrl();
// Disable CPU __interrupts and clear all CPU __interrupt flags:
IER = 0x0000;
IFR = 0x0000;
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the __interrupt
// is not used in this example. This is useful for debug purposes.
// The shell ISR routines are found in F2837xD_DefaultIsr.c.
// This function is found in F2837xD_PieVect.c.
InitPieVectTable();
// Step 4. User specific code:
LoopCount = 0;
EALLOW;
SciaRegs.SCIFFTX.all=0x8000;
scia_fifo_init(); // Initialize the SCI FIFO
scia_echoback_init(); // Initialize SCI for echoback
msg = "\n\r Type 'a' to relock baud-rate: ";
scia_msg(msg);
EDIS;
EALLOW;
SCIA_AutobaudLock();
EDIS;
msg = "\r\n\n\nHello World!\0";
scia_msg(msg);
msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
scia_msg(msg);
for(;;)
{
msg = "\r\nEnter a character: \0";
scia_msg(msg);
// Wait for inc character
while(SciaRegs.SCIFFRX.bit.RXFFST == 0) { } // wait for XRDY =1 for empty state
// Get character
ReceivedChar = SciaRegs.SCIRXBUF.all;
// Echo character back
msg = " You sent: \0";
scia_msg(msg);
scia_xmit(ReceivedChar);
LoopCount++;
}
}
//#################################################
// Uint16 SCIA_AutobaudLock(void)
//------------------------------------------------
// Perform autobaud lock with the host.
// Note that if autobaud never occurs
// the program will hang in this routine as there
// is no timeout mechanism included.
//------------------------------------------------
void SCIA_AutobaudLock(void)
{
Uint16 byteData;
// Must prime baud register with >= 1
SciaRegs.SCIHBAUD.bit.BAUD = 0;
SciaRegs.SCILBAUD.bit.BAUD = 1;
// Prepare for autobaud detection
// Set the CDC bit to enable autobaud detection
// and clear the ABD bit
SciaRegs.SCIFFCT.bit.CDC = 1;
SciaRegs.SCIFFCT.bit.ABDCLR = 1;
// Wait until we correctly read an
// 'A' or 'a' and lock
while(SciaRegs.SCIFFCT.bit.ABD != 1) {}
// After autobaud lock, clear the ABD and CDC bits
SciaRegs.SCIFFCT.bit.ABDCLR = 1;
SciaRegs.SCIFFCT.bit.CDC = 0;
while(SciaRegs.SCIRXST.bit.RXRDY != 1) { }
byteData = SciaRegs.SCIRXBUF.bit.SAR;
SciaRegs.SCITXBUF.bit.TXDT = byteData;
return;
}
// Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scia_echoback_init()
{
// Note: Clocks were turned on to the SCIA peripheral
// in the InitSysCtrl() function
SciaRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
SciaRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
SciaRegs.SCICTL2.all =0x0000;
SciaRegs.SCIHBAUD.all =0x0002;
SciaRegs.SCILBAUD.all =0x008B;
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
// Transmit a character from the SCI
void scia_xmit(int a)
{
while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {}
SciaRegs.SCITXBUF.all =a;
}
void scia_msg(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
{
scia_xmit(msg[i]);
i++;
}
}
// Initialize the SCI FIFO
void scia_fifo_init()
{
SciaRegs.SCIFFTX.all=0xE040;
SciaRegs.SCIFFRX.all=0x2044;
SciaRegs.SCIFFCT.all=0x0;
}
//===========================================================================
// No more.
//===========================================================================
