fm25cl64.h

FM25CL64 FRAM IC controlled through SPI interface reading and writing functions using atmel atmega88

//-------------------- FM25LC64 SPI FRAM 8kbyte memory modul header file -------------------------------------

#define CS_MEM			PD4	//PC1
#define CS_MEM_PORT		PORTD				// memory chip select port, active low level!
#define CS_MEM_BIT		BIT4
#define CS_MEM_DIR		DDRD
#define CS_MEM_ON		clearbit(CS_MEM_PORT,CS_MEM)
#define CS_MEM_OFF		setbit(CS_MEM_PORT,CS_MEM)

#define MemoryWriteInProgress() while(ReadMemoryStatus() & 0x01) DELAY_50US_10MHz;

void MemoryWriteEnable(void)		// nem kell ut醤a MemoryWriteInProgress v醨akoz醩
 {
 CS_MEM_ON;
 SPDR=0x06;						// write enable bit set in the memory status register instruction
 while(!(SPSR & (1<<SPIF)));
 CS_MEM_OFF;
 }

void MemoryWriteDisable(void)		// nem kell ut醤a MemoryWriteInProgress v醨akoz醩
 {
 CS_MEM_ON;
 SPDR=0x04;						// write enable bit reset in the memory status register instruction
 while(!(SPSR & (1<<SPIF)));
 CS_MEM_OFF; 
 }

unsigned char ReadMemoryStatus(void)
 {
 CS_MEM_ON;
 SPDR=0x05;						// read memory status register instruction
 while(!(SPSR & (1<<SPIF)));	// waits for the SPI transmit to be finished
 SPDR=0x00;
 while(!(SPSR & (1<<SPIF)));
 CS_MEM_OFF;
 return SPDR;
 }

void WriteMemoryStatus(unsigned char data)		// kell ut醤a MemoryWriteInProgress v醨akoz醩 illetve MemoryWriteEnable
 {
 CS_MEM_ON;
 SPDR=0x01;						// write memory status register instruction
 while(!(SPSR & (1<<SPIF)));	// waits for the SPI transmit to be finished
 SPDR=data;
 while(!(SPSR & (1<<SPIF)));
 CS_MEM_OFF; 
 MemoryWriteInProgress();
 MemoryWriteEnable();
 }
void WriteMemory(unsigned int address,unsigned char data)	// ~32us id