LAUNCHXL-F28069M: Simple UART Receiving Program Problem.

Part Number: LAUNCHXL-F28069M
Other Parts Discussed in Thread: MSP430F5529

Hello! 

I'm trying to set-up a simple UART program which stores data sent to the C2000 into an array. I posted a similar question earlier, but I found I had with the answer! I revised my code and cleared-up some things.

Here's some functionality requirements:

- 9600 BAUD

- CPU-Interrupt when a message is received (RXBUF has a byte)

- Infrequent messages

- The messages will compose of 1-2 words such as 'Route 1', or 'Go' or 'Stop'.

- The C2000 will be interfaced to an HC06 which will receive data over bluetooth sent from an app. This has been tested and confirmed working on the MSP430F5529 @ 9600 BAUD

I've gone through the two example projects, but I've had some trouble with this application.

I have the TX of the HC06 going into Pin 3, which, if I understand correctly, is J1.3 which is also GPIO28 when the jumpers are shorting JP6 & JP7, is this right?

Here's my code for SCI (I know theres no includes and what not, this is because its part of a bigger project which has timers, epwm, ecap, etc.):

__interrupt void sciaRxFifoIsr(void);

volatile unsigned char RXParseData[256] = {}; // Array which stores the data received in RXBUF

void main(void)

{

//--- CPU Initialization
InitSysCtrl(); // Initialize the CPU (FILE: SysCtrl.c)

InitPieCtrl(); // Initialize and enable the PIE (FILE: PieCtrl.c)
InitWatchdog(); // Initialize the Watchdog Timer (FILE: WatchDog.c)

//---- SCI -- SETUP
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)

/* 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)

/* 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

EDIS;

// END SCI SETUP

// 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 F2806x_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 F2806x_DefaultIsr.c.
// This function is found in F2806x_PieVect.c.
InitPieVectTable();

// Interrupts that are used in this example are re-mapped to
// ISR functions found within this file.
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.SCIRXINTA = &sciaRxFifoIsr;
EDIS; // This is needed to disable write to EALLOW protected registers

//FIFO SETUP
SciaRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol

SciaRegs.SCICTL1.all =0x0001; // enable RX, internal SCICLK,
// Disable TX, RX ERR, SLEEP, TXWAKE
SciaRegs.SCICTL2.bit.RXBKINTENA =1;
SciaRegs.SCIHBAUD = 0x0000;
SciaRegs.SCILBAUD = 0x00C2; // 9600 BAUD -> Found in the common baud rates, BRR = 0xC2 or 194 (in decimal)

SciaRegs.SCIFFRX.all=0x0022;
SciaRegs.SCIFFCT.all=0x00;

SciaRegs.SCICTL1.all =0x0021; // Relinquish SCI from Reset
SciaRegs.SCIFFRX.bit.RXFIFORESET=1;

// Enable interrupts required for this example
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER9.bit.INTx1=1; // PIE Group 9, INT1
PieCtrlRegs.PIEIER9.bit.INTx2=1; // PIE Group 9, INT2
IER = 0x100; // Enable CPU INT
EINT;

//--- Enable global interrupts
asm(" CLRC INTM, DBGM"); // Enable global interrupts and realtime debug

}

__interrupt void sciaRxFifoIsr(void)
{
Uint16 i = 0;
for(i=0;i<2;i++)
{
RXParseData[i]=SciaRegs.SCIRXBUF.all; // Read data

}

while (i != NULL)
{
RXParseData[i]=SciaRegs.SCIRXBUF.all; // Read data  ------------->The first characters ascii code doesnt match with whats being received. ie. 'S' in 'STOP' ended up being 0x87
i++; ///---------------------------------------------------------------------------------> i is incrementing forever
}

SciaRegs.SCIFFRX.bit.RXFFOVRCLR=1; // Clear Overflow flag
SciaRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag

PieCtrlRegs.PIEACK.all|=0x100; // Issue PIE ack
}

Just as a last note, when I changed the BAUD rate, I noticed RXBUF had different values in it. I believe I'm running at 90MHz (maybe Im not and thats the problem? How could I confirm this?). And I had this working on the MSP430, so the bluetooth module is fine! 

Thanks!