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在学SSI的通信接口，试着通过寄存器直接控制，可是调试时发现，对SSI的数据寄存器直接赋值根本就不能赋值，换句话说赋值是无效的。这是什么情况？是我别的寄存器控制有问题，导致这个受干扰？还是什么别的情况？个人觉得应该是可以直接赋值的，求指导？
SSI的数据发送和接收通过操作FIFO来实现。
具体函数为：
void SSIDataPut(uint32_t ui32Base, uint32_t ui32Data)
void SSIDataGet(uint32_t ui32Base, uint32_t *pui32Data)
用寄存器直接操作怎么操作？
看外设驱动库的源码嘛：
voidSSIDataGet(uint32_t ui32Base, uint32_t *pui32Data){ // // Check the arguments. // ASSERT(_SSIBaseValid(ui32Base));
// // Wait until there is data to be read. // while(!(HWREG(ui32Base + SSI_O_SR) & SSI_SR_RNE)) { }
// // Read data from SSI. // *pui32Data = HWREG(ui32Base + SSI_O_DR);}
voidSSIDataPut(uint32_t ui32Base, uint32_t ui32Data){ // // Check the arguments. // ASSERT(_SSIBaseValid(ui32Base)); ASSERT((ui32Data & (0xfffffffe << (HWREG(ui32Base + SSI_O_CR0) & SSI_CR0_DSS_M))) == 0);
// // Wait until there is space. // while(!(HWREG(ui32Base + SSI_O_SR) & SSI_SR_TNF)) { }
// // Write the data to the SSI. // HWREG(ui32Base + SSI_O_DR) = ui32Data;}
