spi_flash.c File Reference

SPI flash driver. More...

#include <neorv32.h>
#include <system.h>
#include <config.h>
#include <spi_flash.h>
#include <uart.h>

Enumerations
enum	SPI_FLASH_CMD_enum {   SPI_FLASH_CMD_PAGE_PROGRAM = 0x02 , SPI_FLASH_CMD_READ = 0x03 , SPI_FLASH_CMD_WRITE_DISABLE = 0x04 , SPI_FLASH_CMD_READ_STATUS = 0x05 ,   SPI_FLASH_CMD_WRITE_ENABLE = 0x06 , SPI_FLASH_CMD_WAKE = 0xAB , SPI_FLASH_CMD_SECTOR_ERASE = 0xD8 }
enum	SPI_FLASH_SREG_enum { FLASH_SREG_BUSY = 0 , FLASH_SREG_WEL = 1 }

Functions
static void	spi_flash_cmd (uint8_t cmd)
static uint8_t	spi_flash_read_status (void)
static void	spi_flash_send_addr (void)
int	spi_flash_setup (void)
int	spi_flash_erase (void)
int	spi_flash_stream_get (uint32_t *rdata)
int	spi_flash_stream_put (uint32_t wdata)

Variables
uint32_t	g_flash_addr
uint32_t	g_exe_size

Detailed Description

SPI flash driver.

Enumeration Type Documentation

SPI_FLASH_CMD_enum

enum SPI_FLASH_CMD_enum

Enumerator
SPI_FLASH_CMD_PAGE_PROGRAM	Program page
SPI_FLASH_CMD_READ	Read data
SPI_FLASH_CMD_WRITE_DISABLE	Disallow write access
SPI_FLASH_CMD_READ_STATUS	Get status register
SPI_FLASH_CMD_WRITE_ENABLE	Allow write access
SPI_FLASH_CMD_WAKE	Wake up from sleep mode
SPI_FLASH_CMD_SECTOR_ERASE	Erase complete sector

SPI_FLASH_SREG_enum

enum SPI_FLASH_SREG_enum

Enumerator
FLASH_SREG_BUSY	Busy, write/erase in progress when set, read-only
FLASH_SREG_WEL	Write access enabled when set, read-only

Function Documentation

spi_flash_cmd()

static void spi_flash_cmd ( uint8_t cmd )

static

Send single command to SPI flash.

Parameters

[in]

cmd

Command byte.

spi_flash_erase()

int spi_flash_erase

(

void

)

Erase flash. Call spi_flash_setup() before.

Returns

0 if success, !=0 if error

spi_flash_read_status()

static uint8_t spi_flash_read_status ( void )

static

Read flash status register.

Returns

SPI flash status register.

spi_flash_send_addr()

static void spi_flash_send_addr ( void )

static

Send address to flash.

spi_flash_setup()

int spi_flash_setup

(

void

)

Setup SPI flash.

Returns

0 if success, !=0 if error

spi_flash_stream_get()

int spi_flash_stream_get

(

uint32_t *

rdata

)

Read stream word from SPI flash.

Parameters

[in,out]

rdata

Pointer for returned data (uint32_t).

Returns

0 if success, !=0 if error

spi_flash_stream_put()

int spi_flash_stream_put

(

uint32_t

wdata

)

Write stream word to SPI flash.

Parameters

wdata

SPI flash write data.

Returns

0 if success, !=0 if error