printf和xil_printf的不同

https://www.eefocus.com/walkie/blog/09-02/165549_bf04c.html

ps端对DDR的读写

/***************************************************************************/
/
*

@brief Performs an input operation for a memory location by reading

      from the specified address and returning the 8 bit Value read from

```
       that address.
```
@param Addr: contains the address to perform the input operation
@return The 8 bit Value read from the specified input address.

******************************************************************************/
static INLINE u8 Xil_In8(UINTPTR Addr)
{
return *(volatile u8 *) Addr;
}

/***************************************************************************/
/
*

@brief Performs an input operation for a memory location by reading from

      the specified address and returning the 16 bit Value read from that

```
      address.
```
@param Addr: contains the address to perform the input operation
@return The 16 bit Value read from the specified input address.

******************************************************************************/
static INLINE u16 Xil_In16(UINTPTR Addr)
{
return *(volatile u16 *) Addr;
}

/***************************************************************************/
/
*

@brief Performs an input operation for a memory location by

      reading from the specified address and returning the 32 bit Value

```
      read  from that address.
```
@param Addr: contains the address to perform the input operation
@return The 32 bit Value read from the specified input address.

******************************************************************************/
static INLINE u32 Xil_In32(UINTPTR Addr)
{
return *(volatile u32 *) Addr;
}

/***************************************************************************/
/
*

@brief Performs an input operation for a memory location by reading the

       64 bit Value read  from that address.

@param Addr: contains the address to perform the input operation
@return The 64 bit Value read from the specified input address.

******************************************************************************/
static INLINE u64 Xil_In64(UINTPTR Addr)
{
return *(volatile u64 *) Addr;
}

/***************************************************************************/
/
*

@brief Performs an output operation for an memory location by

      writing the 8 bit Value to the the specified address.

@param Addr: contains the address to perform the output operation
@param Value: contains the 8 bit Value to be written at the specified
```
      address.
```
@return None.

******************************************************************************/
static INLINE void Xil_Out8(UINTPTR Addr, u8 Value)
{
volatile u8 *LocalAddr = (volatile u8 *)Addr;
*LocalAddr = Value;
}

/***************************************************************************/
/
*

@brief Performs an output operation for a memory location by writing the

       16 bit Value to the the specified address.

@param Addr contains the address to perform the output operation
@param Value contains the Value to be written at the specified address.
@return None.

******************************************************************************/
static INLINE void Xil_Out16(UINTPTR Addr, u16 Value)
{
volatile u16 *LocalAddr = (volatile u16 *)Addr;
*LocalAddr = Value;
}

/***************************************************************************/
/
*

@brief Performs an output operation for a memory location by writing the

      32 bit Value to the the specified address.

@param Addr contains the address to perform the output operation
@param Value contains the 32 bit Value to be written at the specified
```
      address.
```
@return None.

******************************************************************************/
static INLINE void Xil_Out32(UINTPTR Addr, u32 Value)
{
#ifndef ENABLE_SAFETY
volatile u32 *LocalAddr = (volatile u32 *)Addr;
*LocalAddr = Value;
#else
XStl_RegUpdate(Addr, Value);
#endif
}

/***************************************************************************/
/
*

@brief Performs an output operation for a memory location by writing the

      64 bit Value to the the specified address.

@param Addr contains the address to perform the output operation
@param Value contains 64 bit Value to be written at the specified address.
@return None.

******************************************************************************/
static INLINE void Xil_Out64(UINTPTR Addr, u64 Value)
{
volatile u64 *LocalAddr = (volatile u64 *)Addr;
*LocalAddr = Value;
}

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zynq之ps端开发

printf和xil_printf的不同

ps端对DDR的读写

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