Non Volatile RAM (F-RAM & NVSRAM)

Hello Community,

Greetings for the day!

Myself Vipul Prajapati working as Sr. Engineer at Eaton India Innovation Center, Pune, India for the Power system division group. This is with reference to get the details of standard bitbang SPI routine sample code to do word write into cypress FRAM - CY15E016Q.

We are currently working for a project which uses NXP Legacy automotive MCU (PN - M68HC16Z1). To support the ongoing firmware development, we would require to write SPI bitbang routine in existing FW which can write word by word data to FRAM chip. As this project is with legacy development, running from last 18 years with very limited MCU support, It would be difficult for us to write SPI routine which can do the job without affecting the existing FW.

Could you please help us to provide the sample SPI routine which can be utilize to write word by word data to FRAM chip CY15E016Q?   Thanks in advance!

大家好，我希望我来对地方了。我有一个FM25V10，需要将其连接到PIC16F1826。如何设置PIC16F1826 SPI的示例

/**************************************************
SPI串口初始化
****************************************************/
void SPI_Init(void)
{
SDOSEL = 0; //RC2为SDO

TRISC = 0B00001010; //RC1 input SDI = 1
//RC0 output SCK = 0
//RC2 output SDO = 0
//RC3 INTPUT SS = 1
TRISA = 0B00000010;
//mode 3 CKP = 1,CKE = 1;上升沿发送
SSP1STAT = 0b01000000; // CKE = 1
SSP1CON1 = 0b00110000; // 主模式 WCOL =0;SSP1OV = 0;SSP1EN =1;CKP = 1
SSP1ADD = 0;
SPI_CS=0; //启动从机
WriteSPI(0x06); //写入使能wren指令
SPI_CS=1; //停止从机
__delay_us(10);
SPI_CS=0; //启动从机
WriteSPI(0x01); //写状态寄存器指令
WriteSPI(0x80); //写状态字无保护
SPI_CS=1;
}

/******************************************
WriteSPI 写单字节缓冲储存器
*******************************************/
void WriteSPI(unsigned char i)
{
SSP1IF=0; // clear SSP interrupt bit
SSP1BUF=i;
while(!SSP1IF); // Wait for interrupt flag to go high indicating transmission is complete
}
//**************************************************************************************
// ReadSPI 读单字节缓冲
//**************************************************************************************
unsigned int ReadSPI(void)
{
unsigned char databyte;
SSP1IF=0; // Clear SSP interrupt bit
SSP1BUF = 0x00; // Write dummy data byte to the buffer to initiate transmission
while(!BF); // Wait for interrupt flag to go high indicating transmission is complete
databyte = SSP1BUF; // Read the incoming data byte
return (databyte);
}

//*************************************************************************************
// 从储存器读标志位
//**************************************************************************************
unsigned char Read_SPI_StatusReg(void)
{
unsigned char data_read;

SPI_CS=0;
WriteSPI(0x05); // Send read status register command
data_read = ReadSPI(); // Read the data
SPI_CS=1;
return(data_read);
}

//**************************
//写一个字节进储存器
//**************************
void Write_SPI_Byte(unsigned int address_hi,unsigned int address_lo,unsigned int data)
{
// unsigned int StatusReg;

SPI_CS=0;
WriteSPI(0x06); // Send the set write enable latch command
SPI_CS=1;
__delay_us(10);

SPI_CS=0;
WriteSPI(0x02); // Send write command
WriteSPI(address_hi); // Send high address byte
WriteSPI(address_lo); // Send low address byte
WriteSPI(data); // Send data byte
SPI_CS=1;

}

//********************************
// 从储存器里读一个字节
//********************************
unsigned char Read_SPI_Byte(unsigned int address_hi,unsigned int address_lo)
{
unsigned char readdata;

SPI_CS=0;
WriteSPI(0x03); // Send read command
WriteSPI(address_hi); // Send high address
WriteSPI(address_lo); // Send Low address byte
readdata = ReadSPI(); // Read the data
SPI_CS=1;
return(readdata);
}