/**************************************************
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);
}
