245 lines
8.6 KiB
C
245 lines
8.6 KiB
C
//###########################################################################
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//
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// FILE: Example_2833xMCBSP_FFDLB.c
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//
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// TITLE: DSP2833x Device McBSP Digital Loop Back program.
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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"
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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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// Digital loopback tests for the McBSP peripheral.
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//
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// Three different serial word sizes can be tested.
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//
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// Before compiling this project:
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// * Select the serial word size (8/16/32) by using
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// the #define statements at the beginning of the code.
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//
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//
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// This example does not use interrupts. Instead, a polling
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// method is used to check the receive data. The incoming
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// data is checked for accuracy. If an error is found the error()
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// function is called and execution stops.
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//
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// This program will execute until terminated by the user.
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//
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// Watch Variables:
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// sdata1
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// sdata2
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// rdata1
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// rdata2
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// rdata1_point
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// rdata2_point
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//
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//###########################################################################
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//
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// Original Author: S.S.
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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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// Choose a word size. Uncomment one of the following lines
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#define WORD_SIZE 8 // Run a loopback test in 8-bit mode
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//#define WORD_SIZE 16 // Run a loopback test in 16-bit mode
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//#define WORD_SIZE 32 // Run a loopback test in 32-bit mode
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// Prototype statements for functions found within this file.
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void mcbsp_xmit(int a, int b);
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void error(void);
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// Global data for this example
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Uint16 sdata1 = 0x000; // Sent Data
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Uint16 rdata1 = 0x000; // Recieved Data
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Uint16 sdata2 = 0x000; // Sent Data
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Uint16 rdata2 = 0x000; // Recieved Data
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Uint16 rdata1_point;
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Uint16 rdata2_point;
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void main(void)
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{
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Uint16 datasize;
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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 enable the GPIO for McBSP-A
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InitMcbspaGpio();
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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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datasize = WORD_SIZE;
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InitMcbspa(); // Initalize the Mcbsp-A in loopback test mode
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// Step 5. User specific code, enable interrupts:
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if(datasize == 8) // Run a loopback test in 8-bit mode
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{
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InitMcbspa8bit();
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sdata2 = 0x0000; // value is a don't care for 8-bit mode
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sdata1 = 0x0000; // 8-bit value to send
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rdata2_point = 0x0000; // value is a don't care for 8-bit mode
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rdata1_point = sdata1;
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for(;;)
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{
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mcbsp_xmit(sdata1,sdata2);
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sdata1++;
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sdata1 = sdata1 & 0x00FF; // Keep it to 8-bits
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while(McbspaRegs.SPCR1.bit.RRDY == 0 ) { } // Check for receive
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rdata1 = McbspaRegs.DRR1.all; // read DRR1
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if(rdata1 != rdata1_point) error();
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rdata1_point++;
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rdata1_point = rdata1_point & 0x00FF; // Keep it to 8-bits
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asm(" nop"); // Good place for a breakpoint
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// Check: rdatax_point = sdatax
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// rdata1 = sdata1 - 1
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}
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}
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else if(datasize == 16) // Run a loopback test in 16-bit mode
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{
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InitMcbspa16bit();
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sdata2 = 0x0000; // value is a don't care for 16-bit mode
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sdata1 = 0x0000; // 16-bit value to send
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rdata2_point = 0x0000; // value is a don't care for 16-bit mode
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rdata1_point = sdata1;
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for(;;)
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{
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mcbsp_xmit(sdata1,sdata2);
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sdata1++;
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while(McbspaRegs.SPCR1.bit.RRDY == 0 ) { } // Check for receive
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rdata1 = McbspaRegs.DRR1.all; // read DRR1
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if(rdata1 != rdata1_point) error();
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rdata1_point++;
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asm(" nop"); // Good place for a breakpoint
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// Check: rdatax_point = sdatax
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// rdata1 = sdata1 - 1
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}
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}
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else if(datasize == 32) // Run a loopback test in 16-bit mode
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{
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InitMcbspa32bit();
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sdata1 = 0x0000;
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sdata2 = 0xFFFF;
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rdata1_point = sdata1;
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rdata2_point = sdata2;
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for(;;)
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{
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mcbsp_xmit(sdata1,sdata2);
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sdata1++;
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sdata2--;
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while(McbspaRegs.SPCR1.bit.RRDY == 0 ) { } // Check for receive
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rdata2 = McbspaRegs.DRR2.all;
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rdata1 = McbspaRegs.DRR1.all;
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if(rdata1 != rdata1_point) error();
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if(rdata2 != rdata2_point) error();
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rdata1_point++;
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rdata2_point--;
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asm(" nop"); // Good place for a breakpoint
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// Check: rdatax_point = sdatax
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// rdata1 = sdata1 - 1
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// rdata2 = sdata2 + 1
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}
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}
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}
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// Some Useful local functions
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void error(void)
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{
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asm(" ESTOP0"); // test failed!! Stop!
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for (;;);
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}
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void mcbsp_xmit(int a, int b)
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{
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McbspaRegs.DXR2.all=b;
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McbspaRegs.DXR1.all=a;
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}
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//===========================================================================
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// No more.
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//===========================================================================
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