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spi
Xilinx SDK Drivers API Documentation
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This file contains a design example using the SPI driver (XSpi) and axi_qspi device with a Winbond quad serial flash device in the interrupt mode.
This example erases a Sector, writes to a Page within the Sector, reads back from that Page and compares the data.
This example has been tested with an W25Q64 device. The bytes per page (PAGE_SIZE) in W25Q64 is 256.
None.
MODIFICATION HISTORY:
Ver Who Date Changes
1.00a sdm 04/01/11 First release 4.2 ms 01/23/17 Added xil_printf statement in main function to ensure that "Successfully ran" and "Failed" strings are available in all examples. This is a fix for CR-965028. ms 04/05/17 Modified Comment lines to follow doxygen rules.
Macros | |
#define | READ_WRITE_EXTRA_BYTES 4 /* Read/Write extra bytes */ |
This definitions specify the EXTRA bytes in each of the command transactions. More... | |
Functions | |
int | SpiFlashWriteEnable (XSpi *SpiPtr) |
This function enables writes to the Winbond Serial Flash memory. More... | |
int | SpiFlashWrite (XSpi *SpiPtr, u32 Addr, u32 ByteCount, u8 WriteCmd) |
This function writes the data to the specified locations in the Winbond Serial Flash memory. More... | |
int | SpiFlashRead (XSpi *SpiPtr, u32 Addr, u32 ByteCount, u8 ReadCmd) |
This function reads the data from the Winbond Serial Flash Memory. More... | |
int | SpiFlashBulkErase (XSpi *SpiPtr) |
This function erases the entire contents of the Winbond Serial Flash device. More... | |
int | SpiFlashSectorErase (XSpi *SpiPtr, u32 Addr) |
This function erases the contents of the specified Sector in the Winbond Serial Flash device. More... | |
int | SpiFlashGetStatus (XSpi *SpiPtr) |
This function reads the Status register of the Winbond Flash. More... | |
int | SpiFlashQuadEnable (XSpi *SpiPtr) |
This function sets the QuadEnable bit in Winbond flash. More... | |
int | SpiFlashEnableHPM (XSpi *SpiPtr) |
This function enabled High Performance Mode in Winbond flash, so that data can be read from the flash using DIO and QIO commands. More... | |
void | SpiHandler (void *CallBackRef, u32 StatusEvent, unsigned int ByteCount) |
This function is the handler which performs processing for the SPI driver. More... | |
int | main (void) |
Main function to run the quad flash example. More... | |
#define READ_WRITE_EXTRA_BYTES 4 /* Read/Write extra bytes */ |
This definitions specify the EXTRA bytes in each of the command transactions.
This count includes Command byte, address bytes and any don't care bytes needed.
int main | ( | void | ) |
Main function to run the quad flash example.
None |
References XSpi_LookupConfig().
int SpiFlashBulkErase | ( | XSpi * | SpiPtr | ) |
This function erases the entire contents of the Winbond Serial Flash device.
SpiPtr | is a pointer to the instance of the Spi device. |
int SpiFlashEnableHPM | ( | XSpi * | SpiPtr | ) |
This function enabled High Performance Mode in Winbond flash, so that data can be read from the flash using DIO and QIO commands.
None |
References SpiFlashWriteEnable().
int SpiFlashGetStatus | ( | XSpi * | SpiPtr | ) |
This function reads the Status register of the Winbond Flash.
SpiPtr | is a pointer to the instance of the Spi device. |
int SpiFlashQuadEnable | ( | XSpi * | SpiPtr | ) |
This function sets the QuadEnable bit in Winbond flash.
None |
References SpiFlashWriteEnable().
int SpiFlashRead | ( | XSpi * | SpiPtr, |
u32 | Addr, | ||
u32 | ByteCount, | ||
u8 | ReadCmd | ||
) |
This function reads the data from the Winbond Serial Flash Memory.
SpiPtr | is a pointer to the instance of the Spi device. |
Addr | is the starting address in the Flash Memory from which the data is to be read. |
ByteCount | is the number of bytes to be read. |
int SpiFlashSectorErase | ( | XSpi * | SpiPtr, |
u32 | Addr | ||
) |
This function erases the contents of the specified Sector in the Winbond Serial Flash device.
SpiPtr | is a pointer to the instance of the Spi device. |
Addr | is the address within a sector of the Buffer, which is to be erased. |
int SpiFlashWrite | ( | XSpi * | SpiPtr, |
u32 | Addr, | ||
u32 | ByteCount, | ||
u8 | WriteCmd | ||
) |
This function writes the data to the specified locations in the Winbond Serial Flash memory.
SpiPtr | is a pointer to the instance of the Spi device. |
Addr | is the address in the Buffer, where to write the data. |
ByteCount | is the number of bytes to be written. |
int SpiFlashWriteEnable | ( | XSpi * | SpiPtr | ) |
This function enables writes to the Winbond Serial Flash memory.
SpiPtr | is a pointer to the instance of the Spi device. |
Referenced by SpiFlashEnableHPM(), and SpiFlashQuadEnable().
void SpiHandler | ( | void * | CallBackRef, |
u32 | StatusEvent, | ||
unsigned int | ByteCount | ||
) |
This function is the handler which performs processing for the SPI driver.
It is called from an interrupt context such that the amount of processing performed should be minimized. It is called when a transfer of SPI data completes or an error occurs.
This handler provides an example of how to handle SPI interrupts and is application specific.
CallBackRef | is the upper layer callback reference passed back when the callback function is invoked. |
StatusEvent | is the event that just occurred. |
ByteCount | is the number of bytes transferred up until the event occurred. |