237 lines
7.5 KiB
C
237 lines
7.5 KiB
C
// TI File $Revision: /main/9 $
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// Checkin $Date: April 21, 2008 15:43:19 $
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//###########################################################################
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//
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// FILE: Example_2833xSci_Echoback.c
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//
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// TITLE: DSP2833x Device SCI Echoback.
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//
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// ASSUMPTIONS:
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//
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// This program requires the DSP2833x header files.
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// As supplied, this project is configured for "boot to SARAM" operation.
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//
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// Connect the SCI-A port to a PC via a transciever and cable.
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// The PC application 'hypterterminal' can be used to view the data
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// from the SCI and to send information to the SCI. Characters recieved
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// by the SCI port are sent back to the host.
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//
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// As supplied, this project is configured for "boot to SARAM"
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// operation. The 2833x Boot Mode table is shown below.
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// For information on configuring the boot mode of an eZdsp,
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// please refer to the documentation included with the eZdsp,
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//
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// $Boot_Table:
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//
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// GPIO87 GPIO86 GPIO85 GPIO84
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// XA15 XA14 XA13 XA12
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// PU PU PU PU
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// ==========================================
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// 1 1 1 1 Jump to Flash
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// 1 1 1 0 SCI-A boot
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// 1 1 0 1 SPI-A boot
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// 1 1 0 0 I2C-A boot
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// 1 0 1 1 eCAN-A boot
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// 1 0 1 0 McBSP-A boot
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// 1 0 0 1 Jump to XINTF x16
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// 1 0 0 0 Jump to XINTF x32
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// 0 1 1 1 Jump to OTP
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// 0 1 1 0 Parallel GPIO I/O boot
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// 0 1 0 1 Parallel XINTF boot
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// 0 1 0 0 Jump to SARAM <- "boot to SARAM"
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// 0 0 1 1 Branch to check boot mode
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// 0 0 1 0 Boot to flash, bypass ADC cal
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// 0 0 0 1 Boot to SARAM, bypass ADC cal
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// 0 0 0 0 Boot to SCI-A, bypass ADC cal
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// Boot_Table_End$
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//
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// DESCRIPTION:
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//
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//
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// This test recieves and echo-backs data through the SCI-A port.
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//
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// 1) Configure hyperterminal:
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// Use the included hyperterminal configuration file SCI_96.ht.
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// To load this configuration in hyperterminal: file->open
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// and then select the SCI_96.ht file.
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// 2) Check the COM port.
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// The configuration file is currently setup for COM1.
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// If this is not correct, disconnect Call->Disconnect
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// Open the File-Properties dialog and select the correct COM port.
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// 3) Connect hyperterminal Call->Call
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// and then start the 2833x SCI echoback program execution.
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// 4) The program will print out a greeting and then ask you to
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// enter a character which it will echo back to hyperterminal.
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//
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// As is, the program configures SCI-A for 9600 baud with
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// SYSCLKOUT = 150MHz and LSPCLK = 37.5 MHz
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// SYSCLKOUT = 100MHz and LSPCLK = 25.0 Mhz
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//
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//
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// Watch Variables:
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// LoopCount for the number of characters sent
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// ErrorCount
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//
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//
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//###########################################################################
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// $TI Release: DSP2833x/DSP2823x Header Files V1.20 $
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// $Release Date: August 1, 2008 $
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//###########################################################################
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#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
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// Prototype statements for functions found within this file.
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void scia_echoback_init(void);
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void scia_fifo_init(void);
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void scia_xmit(int a);
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void scia_msg(char *msg);
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// Global counts used in this example
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Uint16 LoopCount;
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Uint16 ErrorCount;
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void main(void)
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{
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Uint16 ReceivedChar;
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char *msg;
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// Step 1. Initialize System Control:
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// PLL, WatchDog, enable Peripheral Clocks
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// This example function is found in the DSP2833x_SysCtrl.c file.
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InitSysCtrl();
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// Step 2. Initalize GPIO:
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// This example function is found in the DSP2833x_Gpio.c file and
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// illustrates how to set the GPIO to it's default state.
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// InitGpio(); Skipped for this example
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// For this example, only init the pins for the SCI-A port.
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// This function is found in the DSP2833x_Sci.c file.
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InitSciaGpio();
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// Step 3. Clear all interrupts and initialize PIE vector table:
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// Disable CPU interrupts
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DINT;
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// Initialize PIE control registers to their default state.
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// The default state is all PIE interrupts disabled and flags
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// are cleared.
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// This function is found in the DSP2833x_PieCtrl.c file.
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InitPieCtrl();
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// Disable CPU interrupts and clear all CPU interrupt flags:
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IER = 0x0000;
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IFR = 0x0000;
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// Initialize the PIE vector table with pointers to the shell Interrupt
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// Service Routines (ISR).
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// This will populate the entire table, even if the interrupt
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// is not used in this example. This is useful for debug purposes.
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// The shell ISR routines are found in DSP2833x_DefaultIsr.c.
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// This function is found in DSP2833x_PieVect.c.
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InitPieVectTable();
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// Step 4. Initialize all the Device Peripherals:
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// This function is found in DSP2833x_InitPeripherals.c
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// InitPeripherals(); // Not required for this example
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// Step 5. User specific code:
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LoopCount = 0;
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ErrorCount = 0;
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scia_fifo_init(); // Initialize the SCI FIFO
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scia_echoback_init(); // Initalize SCI for echoback
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msg = "\r\n\n\nHello World!\0";
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scia_msg(msg);
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msg = "\r\nYou will enter a character, and the DSP will echo it back! \n\0";
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scia_msg(msg);
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for(;;)
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{
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msg = "\r\nEnter a character: \0";
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scia_msg(msg);
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// Wait for inc character
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while(SciaRegs.SCIFFRX.bit.RXFFST !=1) { } // wait for XRDY =1 for empty state
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// Get character
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ReceivedChar = SciaRegs.SCIRXBUF.all;
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// Echo character back
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msg = " You sent: \0";
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scia_msg(msg);
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scia_xmit(ReceivedChar);
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LoopCount++;
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}
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}
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// Test 1,SCIA DLB, 8-bit word, baud rate 0x000F, default, 1 STOP bit, no parity
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void scia_echoback_init()
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{
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// Note: Clocks were turned on to the SCIA peripheral
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// in the InitSysCtrl() function
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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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#if (CPU_FRQ_150MHZ)
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SciaRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 37.5MHz.
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SciaRegs.SCILBAUD =0x00E7;
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#endif
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#if (CPU_FRQ_100MHZ)
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SciaRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 20MHz.
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SciaRegs.SCILBAUD =0x0044;
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#endif
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SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
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}
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// Transmit a character from the SCI
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void scia_xmit(int a)
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{
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while (SciaRegs.SCIFFTX.bit.TXFFST != 0) {}
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SciaRegs.SCITXBUF=a;
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}
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void scia_msg(char * msg)
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{
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int i;
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i = 0;
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while(msg[i] != '\0')
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{
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scia_xmit(msg[i]);
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i++;
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}
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}
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// Initalize the SCI FIFO
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void scia_fifo_init()
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{
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SciaRegs.SCIFFTX.all=0xE040;
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SciaRegs.SCIFFRX.all=0x204f;
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SciaRegs.SCIFFCT.all=0x0;
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}
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//===========================================================================
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// No more.
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//===========================================================================
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