SH7262 datasheet(28/45 Pages) RENESAS

28 / 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 28 of 45

3.10

Sample Program Listing "serial_flash.c" (7/19)

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void sf_byte_read_long(unsigned long addr, unsigned long *buf, int size)

{

unsigned char cmd[5];

cmd[0] = SFLASHCMD_BYTE_READ;

cmd[1] = (unsigned char)((addr >> 16) & 0xff);

cmd[2] = (unsigned char)((addr >>

8) & 0xff);

cmd[3] = (unsigned char)( addr

& 0xff);

cmd[4]

= 0x00;

#ifdef SF_USE_DMAC

io_cmd_exe_rdmode_dma_l(cmd, 5, buf, size);

#else

io_cmd_exe_rdmode_cpu_l(cmd, 5, buf, size);

#endif

}

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

* ID

* Outline

: Write enable

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

* Include

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

* Declaration

: static void write_enable(void);

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

* Description

: Issues the Write Enable command to enable erasing or programming

: serial flash memory.

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

* Argument

: void

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

* Return Value : void

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

* Note

: None

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

static void write_enable(void)

{

unsigned char cmd[1];

cmd[0] = SFLASHCMD_WRITE_ENABLE;

io_cmd_exe(cmd, 1, NULL, 0);

}

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