SH7262 datasheet(23/45 Pages) RENESAS

23 / 45 page

SH7262/SH7264 Group

High-speed Read/Write Serial Flash Memory

Using the Renesas Serial Peripheral Interface

REJ06B0889-0100/Rev.1.00

June 2009

Page 23 of 45

3.5

Sample Program Listing "serial_flash.c" (2/19)

/* ==== Macro definition ==== */

#define SFLASHCMD_CHIP_ERASE

0xc7

#define SFLASHCMD_SECTOR_ERASE 0xd8

#define SFLASHCMD_BYTE_PROGRAM 0x02

#define SFLASHCMD_BYTE_READ

0x0B

#define SFLASHCMD_BYTE_READ_LOW

0x03

#define SFLASHCMD_WRITE_ENABLE 0x06

#define SFLASHCMD_WRITE_DISABLE

0x04

#define SFLASHCMD_READ_STATUS 0x05

#define SFLASHCMD_WRITE_STATUS 0x01

#define UNPROTECT_WR_STATUS

0x00

#define PROTECT_WR_STATUS

0x3C

#define SF_USE_DMAC

/* Define this macro when using the function

(sf_byte_read_long)in the DMA transfer */

/* ==== Function prototype declaration ==== */

/*** Local function ***/

static void write_enable(void);

static void write_disable(void);

static void busy_wait(void);

static unsigned char read_status(void);

static void write_status(unsigned char status);

static void io_init_rspi(void);

static void io_cmd_exe(unsigned char *ope, int ope_sz, unsigned char *data, int data_sz);

static void io_cmd_exe_rdmode(unsigned char *ope, int ope_sz, unsigned char *rd, int rd_sz);

static void io_cmd_exe_rdmode_cpu_l(unsigned char *ope, int ope_sz, unsigned long *rd, int rd_sz);

static void io_cmd_exe_rdmode_dma_l(unsigned char *ope, int ope_sz, unsigned long *rd, int rd_sz);

static void io_wait_tx_end(void);

/* ==== Variable definition ==== */

/*""FUNC COMMENT""**************************************************************

* ID

* Outline

: Serial flash memory initialization

*------------------------------------------------------------------------------

* Include

*------------------------------------------------------------------------------

* Declaration

: void sf_init_serial_flash(void);

*------------------------------------------------------------------------------

* Description

: Initializes serial flash memory for being accessed.

: Initializes channel 0 of the Renesas Serial Peripheral

: Interface (RSPI).

*------------------------------------------------------------------------------

* Argument

: void

*------------------------------------------------------------------------------

* Return Value : void

*------------------------------------------------------------------------------

* Note

: None

*""FUNC COMMENT END""**********************************************************/

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