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Bootloader Code Listing (V3.0)

// TI File $Revision: /main/3 $

// Checkin $Date: January 10, 2005 15:57:54 $

//###########################################################################

// FILE: SPI_Boot.c

// TITLE: 280x SPI Boot mode routines

// Functions:

// Uint32 SPI_Boot(void)

// inline void SPIA_Init(void)

// inline void SPIA_Transmit(u16 cmdData)

// inline void SPIA_ReservedFn(void);

// Uint32 SPIA_GetWordData(void)

// Notes:

//###########################################################################

// $TI Release:$

// $Release Date:$

//###########################################################################

#include "DSP280x_Device.h"

#include "280x_Boot.h"

// Private functions

inline void SPIA_Init(void);

inline Uint16 SPIA_Transmit(Uint16 cmdData);

inline void SPIA_ReservedFn(void);

Uint16 SPIA_GetWordData(void);

// External functions

extern void CopyData(void);

Uint32 GetLongData(void);

//#################################################

// Uint32 SPI_Boot(void)

//--------------------------------------------

// This module is the main SPI boot routine.

// It will load code via the SPI-A port.

// It will return a entry point address back

// to the ExitBoot routine.

//--------------------------------------------

Uint32 SPI_Boot()

{

Uint32 EntryAddr;

// Assign GetWordData to the SPI-A version of the

// function. GetWordData is a pointer to a function.

GetWordData = SPIA_GetWordData;

// 1. Init SPI-A and set

// EEPROM chip enable - low

SPIA_Init();

// 2. Enable EEPROM and send EEPROM Read Command

SPIA_Transmit(0x0300);

// 3. Send Starting for the EEPROM address 16bit

// Sending 0x0000,0000 will work for address and data packets

SPIA_GetWordData();

// 4. Check for 0x08AA data header, else go to flash

if(SPIA_GetWordData() != 0x08AA) return FLASH_ENTRY_POINT;

// 5.Check for Clock speed change and reserved words

SPIA_ReservedFn();

// 6. Get point of entry address after load

SPRU722C – November 2004 – Revised October 2006 Bootloader Code Overview 67

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Brand	Texas Instruments
Model	TMS320*2801 Series
Category	Computer Hardware
Language	English

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