#include "stm32f10x_spi.h"
#include "FRAM.h"

u8 FRAMReadWriteByte(u8 data)
{
	while(SPI_I2S_GetFlagStatus(SPI3,SPI_I2S_FLAG_TXE)==RESET);
	SPI_I2S_SendData(SPI3, data);

	while(SPI_I2S_GetFlagStatus(SPI3,SPI_I2S_FLAG_RXNE)==RESET);
	return (u8)(SPI_I2S_ReceiveData(SPI3));
}

void FRAM_GPIO_config(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;

	//  RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | SPI_FLASH_GPIO_CLK |  FRAM_SPI_SCK_GPIO_CLK | FRAM_SPI_MISO_GPIO_CLK | FRAM_SPI_MOSI_GPIO_CLK , ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE);  

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
	GPIO_Init(GPIOA, &GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 |GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;   
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);

	//  DGFLASH_CS_HIGH();
	FRAM_CS_HIGH();
}

void FRAM_sRF_SPI_Config(void)
{
	SPI_InitTypeDef SPI_InitStructure;

	//  RCC_APB2PeriphClockCmd(FRAM_SPI_CLK, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE); 
	FRAM_CS_HIGH();

	/* Disable sRF_SPI */
	SPI_Cmd(SPI3, DISABLE);

	/*!< SPI configuration */
	SPI_I2S_DeInit(SPI3);
	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init(SPI3, &SPI_InitStructure);

	/*!< Enable the sRF_SPI  */
	SPI_Cmd(SPI3, ENABLE);
}

void FRAM_init(void)
{
	FRAM_GPIO_config();
	FRAM_sRF_SPI_Config();
}


void spiFlash_FRAMFlash_init(void)
{
	FRAM_init();
}

void set_write_enable_latch(void)
{
	FRAM_CS_LOW();
	FRAMReadWriteByte(0x06);
	FRAM_CS_HIGH();  
}

void reset_write_enable_latch(void)
{
	FRAM_CS_LOW();
	FRAMReadWriteByte(0x04);
	FRAM_CS_HIGH();  
}

u8 read_status_reg(void)
{
	u8 retVal;
	FRAM_CS_LOW();
	FRAMReadWriteByte(0x05);
	retVal = FRAMReadWriteByte(0xAA);
	FRAM_CS_HIGH();  
	return retVal;
}

void write_status_reg(u8 val)
{
	FRAM_CS_LOW();
	FRAMReadWriteByte(0x01);
	FRAMReadWriteByte(val);
	FRAM_CS_HIGH();  
}

void read_memory_code(u16 addr, u8 *buf, u16 length)
{
	FRAM_CS_LOW();
	FRAMReadWriteByte(0x03);

	FRAMReadWriteByte((u8)(addr/256));
	FRAMReadWriteByte((u8)(addr%256));

	for (u16 i = 0; i < length; i++)
	{
		buf[i] = FRAMReadWriteByte(0xAA);
	}
	FRAM_CS_HIGH(); 
}

void write_memory_code(u16 addr, u8 *buf, u16 length)
{
	if ((read_status_reg() & 0x02) == 0)
	{
		set_write_enable_latch();
	}

	FRAM_CS_LOW();
	FRAMReadWriteByte(0x02);
	FRAMReadWriteByte((u8)(addr/256));
	FRAMReadWriteByte((u8)(addr%256));
	for (u16 i = 0; i < length; i++)
	{
		FRAMReadWriteByte(buf[i]);
	}
	FRAM_CS_HIGH(); 

	reset_write_enable_latch();

}

void fill_FRAM_area(u16 start, u8 value, u16 length)
{
	if ((read_status_reg() & 0x02) == 0)
	{
		set_write_enable_latch();
	}

	FRAM_CS_LOW();
	FRAMReadWriteByte(0x02);
	FRAMReadWriteByte((u8)(start/256));
	FRAMReadWriteByte((u8)(start%256));
	for (u16 i = 0; i < length; i++)
	{
		FRAMReadWriteByte(value);
	}
	FRAM_CS_HIGH(); 

	reset_write_enable_latch();
}

void read_device_ID(u8 *buf)
{
	FRAM_CS_LOW();
	FRAMReadWriteByte(0x9F);
	buf[0] = FRAMReadWriteByte(0xAA);
	buf[1] = FRAMReadWriteByte(0xAA);
	buf[2] = FRAMReadWriteByte(0xAA);
	buf[3] = FRAMReadWriteByte(0xAA);
	FRAM_CS_HIGH();  
}

void fast_read_memory_code(u16 addr, u8 *buf, u16 length)//fast to 33M
{
	FRAM_CS_LOW();
	FRAMReadWriteByte(0x0B);
	FRAMReadWriteByte((u8)(addr/256));
	FRAMReadWriteByte((u8)(addr%256));
	FRAMReadWriteByte(0xAA);
	for (u16 i = 0; i < length; i++)
	{
		buf[i] = FRAMReadWriteByte(0xAA);
	}
	FRAM_CS_HIGH(); 
}

void FRAM_test(void)
{
	u8 framTest[] = "I am a girl";
	u8 ffff[15];

	FRAM_init();

	read_device_ID(framTest);
	//      GDflash_erase(0,  0);
	//GDflash_128KByte_erase();
	write_memory_code(0 , framTest, sizeof(framTest));

	fast_read_memory_code(0, ffff,  sizeof(framTest));
}