185 lines
6.2 KiB
C
185 lines
6.2 KiB
C
// TI File $Revision: /main/9 $
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// Checkin $Date: April 21, 2008 15:43:32 $
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//###########################################################################
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//
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// FILE: Example_2833xSpi_FFDLB.c
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//
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// TITLE: DSP2833x Device Spi 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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//
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// This program uses the internal loop back test mode of the peripheral.
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// Other then boot mode pin configuration, no other hardware configuration
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// is required.
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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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// This program is a SPI example that uses the internal loopback of
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// the peripheral. Interrupts are not used.
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//
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// A stream of data is sent and then compared to the recieved stream.
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//
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// The sent data looks like this:
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// 0000 0001 0002 0003 0004 0005 0006 0007 .... FFFE FFFF
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//
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// This pattern is repeated forever.
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//
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// Watch Variables:
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// sdata - sent data
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// rdata - received data
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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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// Prototype statements for functions found within this file.
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// interrupt void ISRTimer2(void);
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void delay_loop(void);
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void spi_xmit(Uint16 a);
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void spi_fifo_init(void);
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void spi_init(void);
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void error(void);
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void main(void)
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{
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Uint16 sdata; // send data
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Uint16 rdata; // received data
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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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// Setup only the GP I/O only for SPI-A functionality
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// This function is found in DSP2833x_Spi.c
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InitSpiaGpio();
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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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spi_fifo_init(); // Initialize the Spi FIFO
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spi_init(); // init SPI
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// Step 5. User specific code:
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// Interrupts are not used in this example.
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sdata = 0x0000;
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for(;;)
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{
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// Transmit data
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spi_xmit(sdata);
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// Wait until data is received
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while(SpiaRegs.SPIFFRX.bit.RXFFST !=1) { }
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// Check against sent data
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rdata = SpiaRegs.SPIRXBUF;
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if(rdata != sdata) error();
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sdata++;
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}
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}
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// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here:
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void delay_loop()
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{
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long i;
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for (i = 0; i < 1000000; i++) {}
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}
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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 spi_init()
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{
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SpiaRegs.SPICCR.all =0x000F; // Reset on, rising edge, 16-bit char bits
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SpiaRegs.SPICTL.all =0x0006; // Enable master mode, normal phase,
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// enable talk, and SPI int disabled.
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SpiaRegs.SPIBRR =0x007F;
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SpiaRegs.SPICCR.all =0x009F; // Relinquish SPI from Reset
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SpiaRegs.SPIPRI.bit.FREE = 1; // Set so breakpoints don't disturb xmission
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}
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void spi_xmit(Uint16 a)
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{
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SpiaRegs.SPITXBUF=a;
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}
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void spi_fifo_init()
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{
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// Initialize SPI FIFO registers
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SpiaRegs.SPIFFTX.all=0xE040;
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SpiaRegs.SPIFFRX.all=0x204f;
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SpiaRegs.SPIFFCT.all=0x0;
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}
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//===========================================================================
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// No more.
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//===========================================================================
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