SH7262 datasheet(38/45 Pages) RENESAS

38 / 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 38 of 45

3.20

Sample Program Listing "serial_flash.c" (17/19)

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

* ID

* Outline

: Execute command (With read data, longword transfer and DMA).

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

* Include

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

* Declaration

: static void io_cmd_exe_rdmode_dma_l(unsigned char *ope, int ope_sz,

unsigned long *rd,

int rd_sz);

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

* Description

: Executes the specified command.

: Transmits the argument ope, and then receives data in the argument rd.

: Transfer the read data in units of longword, by the DMA transfer.

: Set one of the values between 0 and 8 in the ope_sz.

: Although more than 0 can be set in the rd_sz, set the value

: in multiples of 4.

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

* Argument

: unsigned long *ope ; I : Start address of the opcode block and

address block

: int ope_sz

; I : Number of bytes in the opcode block and

address block

: unsigned long *rd

; I : Buffer address to store the received data

: int rd_sz

; I : Number of bytes in the data block

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

* Return Value : void

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

* Note

: None

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

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

rd_sz)

{

/* ==== Resets buffer ==== */

RSPI0.SPBFCR.BYTE

= 0xC0u;

RSPI0.SPBFCR.BYTE

= 0x00u;

/* ---- Enables the SPI transfer ---- */

RSPI0.SPCR.BIT.SPE = 1;

/* ---- MOSI (command, address, dummy) ---- */

RSPI0.SPCMD0.BIT.CPOL= 1;

/* RSPCK when idling is 1 */

RSPI0.SPCMD0.BIT.CPHA= 0;

/* Outputs data on even (rising) edge */

while(ope_sz--){

RSPI0.SPDR.BYTE = *ope++;

/* Command size must be equal or less than 8 bytes */

}

io_wait_tx_end();

/* Waits for transfer end */

SH7262 Datasheet(PDF) 38 Page - Renesas Technology Corp

SH7262 Datasheet(HTML) 38 Page - Renesas Technology Corp

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