stm32通过spi驱动富士通MB85RS2MT,SPI正常，ID可读，但是不能写数据，请教原因？

枫影06 · 发表于 2020-11-23 16:21:50

stm32F2通过spi驱动富士通MB85RS2MT,SPI正常，ID可读，但是不能写数据，这边原子论坛也有一个相似的帖子，但是我按照那个帖子的方法也弄不了！！！以下是代码：
void SPI_write_MB85RS2MT(uint8_t data,u16 address)
{
uint8_t addr_tempH, addr_tempL;

addr_tempH = (uint8_t)((address&0xff00)>>8); //获取高8位地址
addr_tempL = (uint8_t)(address&0x00ff);       //获取低8位地址
MB_CS_L;
SPIx_ReadWriteByte(MB85RS2MT_WREN_INST); //写使能
MB_CS_H;
delayus(10);
MB_CS_L;
SPIx_ReadWriteByte(MB85RS2MT_WRITE_INST); //写存储器寄存器操作吗
SPIx_ReadWriteByte(addr_tempH);          //写入高八位地址，高3位忽略
SPIx_ReadWriteByte(addr_tempL);          //
SPIx_ReadWriteByte(data);                //写入数据
MB_CS_H;
}

/*******************************************************************************
* @brief  读出特定地址空间的数据
*
* @param  u16 address
* @return uint8_t
*******************************************************************************/
uint8_t SPI_read_MB85RS2MT(uint16_t address)
{
uint8_t dat, addr_tempH, addr_tempL;

addr_tempH = (uint8_t)((address&0xff00)>>8);
addr_tempL = (uint8_t)(address&0x00ff);
MB_CS_L;
SPIx_ReadWriteByte(MB85RS2MT_READ_INST);    //读存储器寄存器操作码
SPIx_ReadWriteByte(addr_tempH);
SPIx_ReadWriteByte(addr_tempL);
dat=SPIx_ReadWriteByte(0xAA);             //读取数据，0xAA给予读取数据所需的时钟
MB_CS_H;
return (dat);
}

uint8_t shuju=0;
uint8_t fram_process(void)
{
uint8_t i = 0, result = 0;

// MB_CS_L;
//
// id1[0]=SPIx_ReadWriteByte(0x9F);       //读ID
// id1[1]=SPIx_ReadWriteByte(0);
// id1[2]=SPIx_ReadWriteByte(0);
// id1[3]=SPIx_ReadWriteByte(0);
// id1[4]=SPIx_ReadWriteByte(0);
// id1[5]=SPIx_ReadWriteByte(0);
//
//  MB_CS_H;

   MB_CS_L;
   SPIx_ReadWriteByte(0x05);             //读取状态寄存器
   MB_CS_H;
   MB_CS_L;
   SPIx_ReadWriteByte(0x01);             //设置状态寄存器
   SPIx_ReadWriteByte( 0x80 );
   MB_CS_H;
   SPI_write_MB85RS2MT(0x05,10);
   shuju=SPI_read_MB85RS2MT(10);
}

shuju这个变量永远都是0，而不是0x05,我怀疑是写数据操作不成功，但是为什么读出来由是0？不应该是0xff吗？写操作有问题在哪里？？？
还有，SPIx_ReadWriteByte( 0x80 );有何用意？手册里找不到这个意思？望用过的大神指教。。。。。