Part Number: TMS320F28377S
Other Parts Discussed in Thread: C2000WARE
Tool/software:
Hello,
I have been trying to communicate over SCI on a custom board with TMS320F28377S. The board has an external clock source of 25MHz connected to pin X1 of the MCU. At the moment, when I use the provided SCI echo loopback example, all I get on the terminal is random data being spit out. Below is my modified example.
//###########################################################################
//
// FILE: Example_2837xSSci_Echoback.c
//
// TITLE: SCI Echoback.
//
//! \addtogroup cpu01_example_list
//! <h1>SCI Echoback (sci_echoback)</h1>
//!
//! This test receives and echo-backs data through the SCI-A port.
//!
//! The PC application 'hyperterminal' or another terminal
//! such as 'putty' can be used to view the data from the SCI and
//! to send information to the SCI. Characters received
//! by the SCI port are sent back to the host.
//!
//! \b Running \b the \b Application
//! -# Configure hyperterminal or another terminal such as putty:
//!
//! For hyperterminal you can use the included hyperterminal configuration
//! file SCI_96.ht.
//! To load this configuration in hyperterminal
//! -# Open hyperterminal
//! -# Go to file->open
//! -# Browse to the location of the project and
//! select the SCI_96.ht file.
//! -# Check the COM port.
//! The configuration file is currently setup for COM1.
//! If this is not correct, disconnect (Call->Disconnect)
//! Open the File-Properties dialogue and select the correct COM port.
//! -# Connect hyperterminal Call->Call
//! and then start the 2837xS SCI echoback program execution.
//! -# The program will print out a greeting and then ask you to
//! enter a character which it will echo back to hyperterminal.
//!
//! \note If you are unable to open the .ht file, or you are using
//! a different terminal, you can open a COM port with the following settings
//! - Find correct COM port
//! - Bits per second = 9600
//! - Date Bits = 8
//! - Parity = None
//! - Stop Bits = 1
//! - Hardware Control = None
//!
//! \b Watch \b Variables \n
//! - LoopCount - the number of characters sent
//!
//! \b External \b Connections \n
//! Connect the SCI-A port to a PC via a transceiver and cable.
//! - GPIO28 is SCI_A-RXD (Connect to Pin3, PC-TX, of serial DB9 cable)
//! - GPIO29 is SCI_A-TXD (Connect to Pin2, PC-RX, of serial DB9 cable)
//!
//
//###########################################################################
// $TI Release: F2837xS Support Library v3.04.00.00 $
// $Release Date: Sun Mar 25 13:27:27 CDT 2018 $
// $Copyright:
// Copyright (C) 2014-2018 Texas Instruments Incorporated - http://www.ti.com/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the
// distribution.
//
// Neither the name of Texas Instruments Incorporated nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// $
//###########################################################################
//
// Included Files
//
#include "F28x_Project.h"
//
// Globals
//
Uint16 LoopCount;
Uint16 rDataA[72] = {0}; // Received data for SCI-A
Uint16 rDataSizeA = 0;
//
// Function Prototypes
//
void scia_echoback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void scia_msg(char *msg);
interrupt void sciaRxFifoIsr(void);
//
// Main
//
void main(void)
{
char *msg;
//
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the F2837xS_SysCtrl.c file.
//
InitSysCtrl();
//
// Step 2. Initialize GPIO:
// This example function is found in the F2837xS_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 F2837xS_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 F2837xS_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 F2837xS_DefaultIsr.c.
// This function is found in F2837xS_PieVect.c.
//
InitPieVectTable();
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.SCIA_RX_INT = &sciaRxFifoIsr;
// PieVectTable.SCIA_TX_INT = &sciaTxFifoIsr;
EDIS; // This is needed to disable write to EALLOW protected registers
scia_fifo_init(); // Initialize the SCI FIFO
scia_echoback_init(); // Initialize SCI for echoback
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;
// msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
// scia_msg(msg);
for(;;)
{
msg = "Hello\r";
scia_msg(msg);
//
// Wait for inc character
//
/* while(SciaRegs.SCIFFRX.bit.RXFFST != 4) {}
rdataA[0] = SciaRegs.SCIRXBUF.bit.SAR;
rdataA[1] = SciaRegs.SCIRXBUF.bit.SAR;
rdataA[2] = SciaRegs.SCIRXBUF.bit.SAR;
rdataA[3] = SciaRegs.SCIRXBUF.bit.SAR;*/
//
// Get character
//
DELAY_US(500000);
rDataSizeA = 0;
//
// Echo character back
//
// msg = " You sent: \0";
// scia_msg(msg);
// scia_xmit(ReceivedChar);
//
// LoopCount++;
}
}
//
// scia_echoback_init - 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.SCICTL1.bit.RXERRINTENA = 1;
SciaRegs.SCICTL2.all = 0x0003;
SciaRegs.SCICTL2.bit.TXINTENA = 1;
SciaRegs.SCICTL2.bit.RXBKINTENA = 1;
//
// SCIA at 9600 baud
// @LSPCLK = 50 MHz (200 MHz SYSCLK) HBAUD = 0x02 and LBAUD = 0x8B.
// @LSPCLK = 30 MHz (120 MHz SYSCLK) HBAUD = 0x01 and LBAUD = 0x86.
//
SciaRegs.SCIHBAUD.all = 0x0000;
SciaRegs.SCILBAUD.all = 0x0081;
// SciaRegs.SCIPRI.bit.FREESOFT = 2;
SciaRegs.SCICTL1.all = 0x0023; // Relinquish SCI from Reset
}
//
// scia_xmit - Transmit a character from the SCI
//
void scia_xmit(int a)
{
while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {}
SciaRegs.SCITXBUF.all =a;
}
//
// scia_msg - Transmit message via SCIA
//
void scia_msg(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
{
scia_xmit(msg[i]);
i++;
}
}
interrupt void sciaRxFifoIsr(void)
{
uint16_t i;
for (i = 0; i < SciaRegs.SCIFFRX.bit.RXFFST; i++)
{
rDataA[rDataSizeA] = SciaRegs.SCIRXBUF.bit.SAR;
rDataSizeA++;
/* if(2 == flagRwFSS)
{
if(0x60 != rDataA[0])
rDataSizeA--;
if(0x08 == rDataSizeA)
rDataFlagRwFss = 2;
}
else if (1 == flagRwFSS)
{
if(0x0A == rDataA[rDataSizeA-1])
{
rDataFlagRwFss = 1;
}
}*/
}
SciaRegs.SCIFFRX.bit.RXFFOVRCLR=1; // Clear Overflow flag
SciaRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag
PieCtrlRegs.PIEACK.all|=PIEACK_GROUP9; // Issue PIE ack
}
//
// scia_fifo_init - Initialize the SCI FIFO
//
void scia_fifo_init()
{
SciaRegs.SCIFFTX.all = 0xE040;
SciaRegs.SCIFFRX.all = 0x2061;
SciaRegs.SCIFFCT.all = 0x0;
}
//
// End of file
//
I've configured Pin 28 and 29 for SCI communication. I have tried different LSPCLK settings at 10MHz, 20MHz, 25MHz, 30MHz etc. Could you provide a fix for the issue?
Best regards.
