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Tool/software: Code Composer Studio
Hello good time
How can I change the registr LOSPCP (LSPCLKDIV) default value????
Does the registry need protection or not?
Saeed,
The system control registers are EALLOW protected. To modify you need to do the following:
asm(" EALLOW"); // Enable EALLOW protected register access
Modify Register Here...
asm(" EDIS"); // Disable EALLOW protected register access
I hope this helps. If this answers your question, please click the green "Verified Answer" button. Thanks.
- Ken
Hi ken schachter
I have used this code from my examples ti but I do not know if I have set the code correctly ClkCfgRegs.LOSPCP.bit.LSPCLKDIV =0x0001 ; or not you can check my code ??
I set baud rates on 4800 . it's true??
I will be grateful
/**
* main.c
*/
//###########################################################################
//
// FILE: Example_2837xDScia_FFDLB.c
//
// TITLE: SCI FIFO Digital Loop Back Test.
//
//! \addtogroup cpu01_example_list
//! <h1>SCI FIFO Digital Loop Back Test (sci_looback)</h1>
//!
//! This program uses the internal loop back test mode of the peripheral.
//! Other then boot mode pin configuration, no other hardware configuration
//! is required.
//!
//! 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.
//!
//! \b Watch \b Variables \n
//! - \b LoopCount - Number of characters sent
//! - \b ErrorCount - Number of errors detected
//! - \b SendChar - Character sent
//! - \b ReceivedChar - Character received
//!
//
//###########################################################################
// $TI Release: F2837xD Support Library v3.06.00.00 $
// $Release Date: Mon May 27 06:48:24 CDT 2019 $
// $Copyright:
// Copyright (C) 2013-2019 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"
//
#define CPU_FREQ 200E6
#define LSPCLK_FREQ CPU_FREQ/2
#define SCI_FREQ 2603
#define SCI_PRD ((LSPCLK_FREQ/(SCI_FREQ*8))-1)
// Globals
//
Uint16 LoopCount;
Uint16 ErrorCount;
//
// Function Prototypes
//
void scia_loopback_init(void);
void scia_fifo_init(void);
void scia_xmit(int a);
void error();
//
// Main
//
void main(void)
{
Uint16 SendChar;
// Uint16 ReceivedChar;
EALLOW;
ClkCfgRegs.LOSPCP.bit.LSPCLKDIV =0x0001 ;
EDIS;
//
// Step 1. Initialize System Control registers, PLL, WatchDog, Clocks to
// default state:
// This 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. Initialize PIE vector table:
// The PIE vector table is initialized with pointers to shell Interrupt
// Service Routines (ISR). The shell routines are found in F2837xD_DefaultIsr.c.
// Insert user specific ISR code in the appropriate shell ISR routine in
// the F2837xD_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 F2837xD_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 F2837xD_PieVect.c.
// This function populates the PIE vector table with pointers
// to the shell ISR functions found in F2837xD_DefaultIsr.c.
//
InitPieVectTable();
//
// Enable CPU and PIE __interrupts
// This example function is found in the F2837xD_PieCtrl.c file.
//
EnableInterrupts();
//
// Step 4. User specific functions, Reassign vectors (optional),
// Enable Interrupts:
//
LoopCount = 0;
ErrorCount = 0;
scia_fifo_init(); // Initialize the SCI FIFO
scia_loopback_init(); // Initialize SCI for digital loop back
//
// Note: Autobaud lock is not required for this example
//
//
// Send a character starting with 0
//
SendChar = 0;
//
// Step 5. Send Characters forever starting with 0x00 and going through
// 0xFF. After sending each, check the receive buffer for the correct value
//
// Uint16 i=0;
for(;;)
{// SendChar=!SendChar;
// DELAY_US(100000);
scia_xmit(SendChar);
// break;
}
//
// wait for RRDY/RXFFST =1 for 1 data available in FIFO
//
// while(SciaRegs.SCIFFRX.bit.RXFFST == 0) { }
//
// Check received character
//
/* ReceivedChar = SciaRegs.SCIRXBUF.all;
if(ReceivedChar != SendChar)
{
error();
}
//
// Move to the next character and repeat the test
//
SendChar++;
//
// Limit the character to 8-bits
//
SendChar &= 0x00FF;
LoopCount++;
}*/
}
//
// error - Function to count errors
//
/*void error()
{
ErrorCount++;
// asm(" ESTOP0"); // Uncomment to stop the test here
// for (;;);
}*/
//
// scia_loopback_init - Configure SCIA settings
//
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.all = 0x002B;
//SciaRegs.SCILBAUD.all = 0x000A;
SciaRegs.SCIHBAUD.all = ((uint16_t)SCI_PRD & 0xFF00U) >> 8U;
SciaRegs.SCILBAUD.all = (uint16_t)SCI_PRD & 0x00FFU;
SciaRegs.SCICCR.bit.LOOPBKENA = 0; // Enable loop back
SciaRegs.SCICTL1.all = 0x0023; // Relinquish SCI from Reset
}
//
// scia_xmit - Transmit a character from the SCI
//
void scia_xmit(int a)
{
SciaRegs.SCITXBUF.all=a;
}
//
// scia_fifo_init - Initialize the SCI FIFO
//
void scia_fifo_init()
{
SciaRegs.SCIFFTX.all = 0xE040;
SciaRegs.SCIFFRX.all = 0x2044;
SciaRegs.SCIFFCT.all = 0x0;
}
//
// End of file
//
I have written this code but I am not sure if it was correct
Saeed,
The structure that you are using to modify the LOSPCP is correct. Attached please find a comparison report between our example code and your modified code. As a suggestion, start again with our example code and make one set of change at a time between testing it. This will help you determine where and if an error has been made. When changing the clock settings to the peripheral make sure that you do not exceed the maximum clocking values for the peripheral. In your code I noticed that you disabled the loopback and changed the clock settings. Try adjusting your code (clock) with the loopback enabled to see if you can get it working.
I hope this helps. If this answers your question, please click the green "Verified Answer" button. Thanks.
- Ken
/cfs-file/__key/communityserver-discussions-components-files/171/2045.Report.html
Saeed,
It's been a while since I have heard from you last. Therefore, I am assuming that my last reply resolved your issue and I will close this thread. If this isn’t the case, please reject this resolution or reply to this thread. If this thread locks, please make a new thread describing the current status of your issue. Thank you.
- Ken
