186 lines
4.7 KiB
C
186 lines
4.7 KiB
C
//#############################################################################
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//
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// File: F2837xD_sci_io.c
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//
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// Description: Contains the various functions related to the serial
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// communications interface (SCI) object
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//
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//#############################################################################
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//
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// $Release Date: $
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// $Copyright:
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// Copyright (C) 2013-2022 Texas Instruments Incorporated - http://www.ti.com/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// $
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//#############################################################################
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//
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// Included Files
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//
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#include <stdio.h>
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#include <file.h>
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#include "F28x_Project.h"
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#include "F2837xD_sci_io.h"
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//
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// Globals
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//
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uint16_t deviceOpen = 0;
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//
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// SCI_open - Initialize and setup SCI
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//
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int SCI_open(const char * path, unsigned flags, int llv_fd)
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{
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if(deviceOpen)
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{
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return (-1);
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}
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else
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{
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EALLOW;
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CpuSysRegs.PCLKCR7.bit.SCI_A = 1;
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SciaRegs.SCIFFTX.all=0xE040;
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SciaRegs.SCIFFRX.all=0x2044;
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SciaRegs.SCIFFCT.all=0x0;
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SciaRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
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// No parity,8 char bits,
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// async mode, idle-line protocol
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SciaRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
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// Disable RX ERR, SLEEP, TXWAKE
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SciaRegs.SCICTL2.all =0x0003;
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SciaRegs.SCICTL2.bit.TXINTENA =1;
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SciaRegs.SCICTL2.bit.RXBKINTENA =1;
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SciaRegs.SCIHBAUD.bit.BAUD =0x0000; // 9600 baud @LSPCLK = 10MHz
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//(40 MHz SYSCLK).
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SciaRegs.SCILBAUD.bit.BAUD =0x0081;
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SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
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EDIS;
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deviceOpen = 1;
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return (1);
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}
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}
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//
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// SCI_close - Set SCI to closed
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//
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int SCI_close(int dev_fd)
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{
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if((dev_fd != 1) || (!deviceOpen))
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{
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return (-1);
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}
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else
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{
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deviceOpen = 0;
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return (0);
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}
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}
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//
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// SCI_read - Read from the SCI RX buffer
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//
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int SCI_read(int dev_fd, char * buf, unsigned count)
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{
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uint16_t readCount = 0;
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uint16_t * bufPtr = (uint16_t *) buf;
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if(count == 0)
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{
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return (0);
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}
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while((readCount < count) && SciaRegs.SCIRXST.bit.RXRDY)
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{
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*bufPtr = SciaRegs.SCIRXBUF.bit.SAR;
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readCount++;
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bufPtr++;
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}
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return (readCount);
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}
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//
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// SCI_write - Write to the SCI TX buffer
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//
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int SCI_write(int dev_fd, char * buf, unsigned count)
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{
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uint16_t writeCount = 0;
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uint16_t * bufPtr = (uint16_t *) buf;
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if(count == 0)
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{
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return (0);
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}
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while(writeCount < count)
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{
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while(SciaRegs.SCICTL2.bit.TXRDY != 1)
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{
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}
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SciaRegs.SCITXBUF.bit.TXDT = *bufPtr;
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writeCount++;
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bufPtr++;
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}
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return (writeCount);
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}
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//
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// SCI_lseek - Do nothing
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//
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off_t SCI_lseek(int dev_fd, off_t offset, int origin)
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{
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return (0);
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}
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//
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// SCI_unlink - Do nothing
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//
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int SCI_unlink(const char * path)
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{
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return (0);
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}
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//
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// SCI_rename - Do nothing
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//
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int SCI_rename(const char * old_name, const char * new_name)
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{
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return (0);
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}
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//
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// End of file
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//
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