Other Parts Discussed in Thread: CONTROLSUITE
Tool/software: Code Composer Studio
Hi,
I am trying to use SCIA Rx interrupt to save a received data in a variable (Received Char). The data is sent through the same DSP using Tx pin of SCIA.
I see that in the watch window the value of RXRDY pin goes 1 still the Rx interrupt does not trigger and it shows me an OE error as i am sending the data continuously. Am i missing something in the initialization?
or setting up my system?
Rx_int.txt
// TI File $Revision: /main/11 $
// Checkin $Date: May 12, 2008 14:24:12 $
//###########################################################################
//
// FILE: Example_2833xSci_FFDLB.c
//
// TITLE: DSP2833x Device SCI FIFO Digital Loop Back Test.
//
// ASSUMPTIONS:
//
// This program requires the DSP2833x header files.
//
// This program uses the internal loop back test mode of the peripheral.
// Other then boot mode pin configuration, no other hardware configuration
// is required.
//
// As supplied, this project is configured for "boot to SARAM"
// operation. The 2833x Boot Mode table is shown below.
// For information on configuring the boot mode of an eZdsp,
// please refer to the documentation included with the eZdsp,
//
// $Boot_Table:
//
// GPIO87 GPIO86 GPIO85 GPIO84
// XA15 XA14 XA13 XA12
// PU PU PU PU
// ==========================================
// 1 1 1 1 Jump to Flash
// 1 1 1 0 SCI-A boot
// 1 1 0 1 SPI-A boot
// 1 1 0 0 I2C-A boot
// 1 0 1 1 eCAN-A boot
// 1 0 1 0 McBSP-A boot
// 1 0 0 1 Jump to XINTF x16
// 1 0 0 0 Jump to XINTF x32
// 0 1 1 1 Jump to OTP
// 0 1 1 0 Parallel GPIO I/O boot
// 0 1 0 1 Parallel XINTF boot
// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
// 0 0 1 1 Branch to check boot mode
// 0 0 1 0 Boot to flash, bypass ADC cal
// 0 0 0 1 Boot to SARAM, bypass ADC cal
// 0 0 0 0 Boot to SCI-A, bypass ADC cal
// Boot_Table_End$
//
// DESCRIPTION:
//
// This test uses the loopback test mode of the SCI module to send
// characters starting with 0x00 through 0xFF. The test will send
// a character and then check the receive buffer for a correct match.
//
// Watch Variables:
// LoopCount Number of characters sent
// ErrorCount Number of errors detected
// SendChar Character sent
// ReceivedChar Character recieved
//
//
//###########################################################################
//
// Original Author: S.S.
//
// $TI Release: DSP2833x/DSP2823x C/C++ Header Files V1.31 $
// $Release Date: August 4, 2009 $
//###########################################################################
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
// Prototype statements for functions found within this file.
void scia_loopback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void error();
interrupt void scia_rx_isr(void);
interrupt void scia_tx_isr(void);
// Global counts used in this example
Uint16 LoopCount;
Uint16 ErrorCount;
Uint16 SendChar;
Uint16 ReceivedChar;
void main(void)
{
// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to default state:
// This function is found in the DSP2833x_SysCtrl.c file.
InitSysCtrl();
// Step 2. Select GPIO for the device or for the specific application:
// This function is found in the DSP2833x_Gpio.c file.
// InitGpio(); skip this as this is example selects the I/O
// for SCI-A in this file itself
InitSciGpio();
// Step 3. Initialize PIE vector table:
// The PIE vector table is initialized with pointers to shell Interrupt
// Service Routines (ISR). The shell routines are found in DSP2833x_DefaultIsr.c.
// Insert user specific ISR code in the appropriate shell ISR routine in
// the DSP28_DefaultIsr.c file.
// Disable and clear all CPU interrupts:
DINT;
IER = 0x0000;
IFR = 0x0000;
// Initialize Pie Control Registers To Default State:
// This function is found in the DSP2833x_PieCtrl.c file.
// InitPieCtrl(); PIE is not used for this example
// Initialize the PIE Vector Table To a Known State:
// This function is found in DSP2833x_PieVect.c.
// This function populates the PIE vector table with pointers
// to the shell ISR functions found in DSP2833x_DefaultIsr.c.
InitPieVectTable();
EALLOW;
PieVectTable.SCIRXINTA = &scia_rx_isr;
PieVectTable.SCITXINTA = &scia_tx_isr;
EDIS;
// Enable CPU and PIE interrupts
// This example function is found in the DSP2833x_PieCtrl.c file.
EnableInterrupts();
IER|= M_INT9;
PieCtrlRegs.PIEIER9.bit.INTx1 = 1;
PieCtrlRegs.PIEIER9.bit.INTx2 = 1;
EINT;
ERTM;
// EALLOW;
//SysCtrlRegs.LOSPCP.bit.LSPCLK= 0;
//EDIS;
// Step 4. Initialize all the Device Peripherals to a known state:
// This function is found in DSP2833x_InitPeripherals.c
// InitPeripherals(); skip this for SCI tests
// Step 5. User specific functions, Reassign vectors (optional), Enable Interrupts:
LoopCount = 0;
ErrorCount = 0;
// scia_fifo_init(); // Initialize the SCI FIFO
scia_loopback_init(); // Initalize SCI for digital loop back
// Note: Autobaud lock is not required for this example
// Send a character starting with 0
SendChar = 10;
// Step 6. Send Characters forever starting with 0x00 and going through
// 0xFF. After sending each, check the recieve buffer for the correct value
for(;;)
{
scia_xmit(SendChar);
// SendChar=SciaRegs.SCIRXEMU;
// while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for RRDY/RXFFST =1 for 1 data available in FIFO
// Check received character
// ReceivedChar=SciaRegs.SCIRXBUF.all;
//scia_xmit(ReceivedChar);
// if(ReceivedChar != SendChar) error();
DELAY_US(10000);
// Move to the next character and repeat the test
SendChar++;
// SendChar &= 0x00FF; // Limit the character to 8-bits
LoopCount++;
}
}
interrupt void scia_rx_isr(void)
{
ReceivedChar=SciaRegs.SCIRXBUF.all;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP9;
}
interrupt void scia_tx_isr(void)
{
}
// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:
void error()
{
ErrorCount++;
// asm(" ESTOP0"); // Uncomment to stop the test here
// for (;;);
}
// Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
void scia_loopback_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 =0x0003;
SciaRegs.SCICTL2.bit.TXINTENA =1;
SciaRegs.SCICTL2.bit.RXBKINTENA =1;
SciaRegs.SCIHBAUD =0x0000;
SciaRegs.SCILBAUD =0x1000;
// SciaRegs.SCICCR.bit.LOOPBKENA =1; // Enable loop back
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
// EALLOW;
// All Zones---------------------------------
// Timing for all zones based on XTIMCLK = SYSCLKOUT
// XintfRegs.XINTCNF2.bit.XTIMCLK = 1; // to check system frequency
// XCLKOUT is enabled
// XintfRegs.XINTCNF2.bit.CLKOFF = 0;
// XCLKOUT = XTIMCLK
// XintfRegs.XINTCNF2.bit.CLKMODE = 0; // 37.5MHZ
// EDIS;
}
// Transmit a character from the SCI'
void scia_xmit(int a)
{
SciaRegs.SCITXBUF=a;
}
// Initalize the SCI FIFO
void scia_fifo_init()
{
SciaRegs.SCIFFTX.all=0xE040;
//SciaRegs.SCIFFRX.bit.RXFIFORESET = 0;
SciaRegs.SCIFFRX.all=0x204f;
// SciaRegs.SCIFFRX.bit.RXFFST= 0;
SciaRegs.SCIFFCT.all=0x0;
}
//===========================================================================
// No more.
//===========================================================================
