SH7262 Datasheet, PDF (23/45 Pages) Renesas Technology Corp – High-speed Read/Write Serial Flash Memory

SH7262/SH7264 Group
High-speed Read/Write Serial Flash Memory
Using the Renesas Serial Peripheral Interface
3.5
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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""**********************************************************/
REJ06B0889-0100/Rev.1.00
June 2009
Page 23 of 45