v3k_fram_demo_4_datash_sdcc.c

DEMO程序 单周期8051内核 8K铁电FRAM 56IO 4KRAM 40MIPS

//-------------------------------------------------------------------------------------------------------//
// V3K_FRAM_Use_Example_SDCC.c  //
//------------------------------//
//
// This program show how to perform the following operations:
//
// -Enables the FRAM memory
// -Fill the FRAM with 0x55
// -Write 0x23 at address 0x9100 in FRAM
// -Read Content of address 0x9100 and place it into B register
// - Activate FRAM Write Protect
// -Show how to Read the FRAM Block protect configuration
//
//	www.ramtron.com
//-------------------------------------------------------------------------------------------------------//

#include <VRS51L3074_SDCC.h>


//--Fram Protect Function prototype
void FramProtect(char);

//--Init pointer to FRAM base address
xdata at 0x8000 unsigned char frambase;				//Init  a char variable pointing to FRAM
xdata unsigned char * data framptr = &frambase ;		//Init a pointer in IRAM pointing to the frambase var.


//////////////////////////////////////////////////////////////////
///////////////////////  MAIN FUNCTION ///////////////////////////
//////////////////////////////////////////////////////////////////

 void main (void){
	int  cptr= 0x00;					//general purpose counter
	//int  x;
	
	DEVMEMCFG  |= 0xC0;					//Activate the FRAM

//--Fill the FRAM with 0x55

	for(cptr = 0; cptr < 0x400; cptr++)
  		*(framptr+cptr) = 0x55;

//--Write 0x23 at address 0x9100 in FRAM

		*(framptr + 0x9100) = 0x23;

//--Read Content of address 0x9100 and place it into B register

		B = *(framptr + 0x9100);
		
//-- Activate FRAM Write Protect

	FRAMCFG1 = 0x01;						//Set FRAMWEL = 1 Enable Write  (FRAMOP = 00)
	while(!(FRAMCFG1&0x80));					//Wait FREADIDLE == 1  (FRAM IDLE)

	FRAMCFG2 = 0x0C;						//Configure FRAMCFG2 to protect the entire FRAM

	FRAMCFG1 = 0x07;						//Execute Transfert of FRAMCFG2 module to FRAM Module
	while(!(FRAMCFG1&0x80));					//Wait FREADIDLE == 1  (FRAM IDLE)

	FRAMCFG1 = 0x03;						//Clear FRAMWEL (FRAMOP = 01)
	while(!(FRAMCFG1&0x80));					//Wait FREADIDLE == 1  (FRAM IDLE)
	
//--Optional Read of the FRAM Block protect configuration
	//read WEL (optional)
	//FRAMCFG1 = 0x05;						//read FRAMCFG2
	//while(!(FRAMCFG1&0x80));				//Wait FREADIDLE == 1  (FRAM IDLE)
	//x = FRAMCFG2							//Read the FRAMCFG2 register

	//(...)

	while(1);

}//end of Main