example_28xxxsd_spi.c

TI 公司 TMS320F28XX SPI 模块常用函数C语言程序。

//############################################################################
//
// FILE:   Example_28xxxSD_SPI.c
//
// TITLE:  DSP280xx SD Card SPI Interface Example 
//
// ASSUMPTIONS:
//
//    This program uses the DSP280xx header files already included in the  
// 	  download. 
//
//	  An SD Card interface to SPI is also required to properly test
//	  this example. A reference design is supplied in the Application Note:
//	 "Interfacing SD/MMC Flash Memory Cards with F28xxx."
//
// DESCRIPTION:
//	 
//	 This project provides an example of how to write to an SD/MMC 
//	 Memory Card. This example shows how to check card insertion,
//	initialize card, read card registers, Read, Write, and Erase Data from 
//	SD/MMC Memory Card. In order to test data written, read, and erased,
//  place a breakpoint after each read command and select View -> Memory 
//	and specify &read_buffer.Data is written to card starting with 0 and incremented
//	by 1 for each value.
//		
//############################################################################		
// Original Author: Tim Love
// Release Date: July 2007
//############################################################################


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#include "SD.h"
#include "DSP280x_Device.h"
#include "DSP280x_Examples.h"

Uint16 read_buffer[1024], write_buffer[1024];

//################################## MAIN ####################################
void main(void)
{
	Uint16 i, testdata = 0x0000;

// 	Step 1. Initialize System Control:
//	PLL, WatchDog, enable Peripheral Clocks
// 	This example function is found in the DSP280x_SysCtrl.c file.
   	InitSysCtrl();

//	 Step 2. Initalize GPIO: 
// 	This example function is found in the DSP280x_Gpio.c file and
// 	illustrates how to set the GPIO to it's default state.
// 	InitGpio();  // Skipped for this example  
// 	Setup only the GP I/O only for SPI-A functionality
// 	This function is found in DSP280x_Spi.c
   	InitSpiaGpio();

// 	Step 3. Clear all interrupts and initialize PIE vector table:
// 	Disable CPU interrupts 
   	DINT;

// 	Initialize PIE control registers to their default state.
// 	The default state is all PIE interrupts disabled and flags
// 	are cleared.  
// 	This function is found in the DSP280x_PieCtrl.c file.
   	InitPieCtrl();

// 	Disable CPU interrupts and clear all CPU interrupt flags:
   	IER = 0x0000;
   	IFR = 0x0000;
   
// 	Initialize the PIE vector table with pointers to the shell Interrupt 
// 	Service Routines (ISR).  
// 	This will populate the entire table, even if the interrupt
// 	is not used in this example.  This is useful for debug purposes.
// 	The shell ISR routines are found in DSP280x_DefaultIsr.c.
// 	This function is found in DSP280x_PieVect.c.
   	InitPieVectTable();
	
// 	Step 4. Initialize all the Device Peripherals:
   	spi_initialization();					//Initialize SPI	

// 	Step 5. User specific code:	

	//Initialize test data for known data to transmit to card
	for(i=0;i<1024;i++)						 
	{										
		write_buffer[i] = testdata;
		testdata += 0x0100;			//Card accepts 8 bit data so upper 8 bits are used
	}

   	led_initialization();			//Initialize all LEDs
   	sd_card_insertion();			//Check for card insertion
	sd_initialization();			//Initialize card

	sd_read_register(SEND_CSD);		//Read CSD register
	sd_read_register(READ_OCR);		//Read OCR register
	sd_read_register(SEND_CID);		//Read CID register

	for(;;)
	{
	sd_write_block(SECTOR_ZERO, write_buffer);	//Write to sector specified
	sd_read_block(SECTOR_ZERO, read_buffer);	//Read from sector specified
    sd_erase_block(SECTOR_ZERO, 1);				//Erase sector range specified
	sd_read_block(SECTOR_ZERO, read_buffer);	//Read from sector specified
	}

	sd_write_multiple_block(SECTOR_ZERO, write_buffer, 2);	//Write to multiple sectors specified	
	sd_read_multiple_block(SECTOR_ZERO, read_buffer, 2);	//Read multiple sectors	specified										//Emulation stop
    sd_erase_block(SECTOR_ZERO, 2);							//Erase sectors range specified				
	sd_read_multiple_block(SECTOR_ZERO, read_buffer, 2);	//Read multiple sectors specified	
	
    asm(" ESTOP0");				//Emulation stop
   	for(;;){};					//Loop forever
} 	
//################################## MAIN ####################################

// Step 7. Insert all local Interrupt Service Routines (ISRs) and functions here: