spi_str71x.c

keil arm flash fs 最新版 在Ｋｅｉｌ ａｒｍ下使用

/*----------------------------------------------------------------------------
 *      R T L  -  F l a s h   F i l e   S y s t e m
 *----------------------------------------------------------------------------
 *      Name:    SPI_STR71X.C 
 *      Purpose: Serial Peripheral Interface Driver for STR71x
 *      Rev.:    V3.22
 *----------------------------------------------------------------------------
 *      This code is part of the RealView Run-Time Library.
 *      Copyright (c) 2004-2008 KEIL - An ARM Company. All rights reserved.
 *---------------------------------------------------------------------------*/

#include <File_Config.h>
#include <71x_lib.h>                    /* STR710 definitions                */


/*----------------------------------------------------------------------------
 *      SPI Driver Functions
 *----------------------------------------------------------------------------
 *  Required functions for SPI driver module:
 *   - void spi_init ()
 *   - void spi_ss (U32 ss)
 *   - U8   spi_send (U8 outb)
 *   - void spi_hi_speed (BOOL on)
 *---------------------------------------------------------------------------*/

/*--------------------------- spi_init --------------------------------------*/

void spi_init (void) {
  /* Initialize and enable the SSP Interface module */

  /* MISO1, MOSI1, SCLK1 are SSP pins */
  GPIO0->PC0 |=  0x0070;
  GPIO0->PC1 |=  0x0070;
  GPIO0->PC2 |=  0x0070;
  /* SPI SS is GPIO, output set to high */
  GPIO0->PD  |=  0x0080;
  GPIO0->PC0 |=  0x0080;
  GPIO0->PC1 &= ~0x0080;
  GPIO0->PC2 |=  0x0080;

  /* Enable SPI in Master Mode, CPOL=0, CPHA=0 with Clk Div=6 */
  BSPI1->CLK  =  6;
  BSPI1->CSR1 =  0x0003;
  BSPI1->CSR2 =  0x0001;

/*--------------------------- spi_hi_speed ----------------------------------*/

void spi_hi_speed (BOOL on) {
   /* Set a SPI clock to low/high speed for SD/MMC. */

   if (on == __TRUE) {
      /* Max. 20 MBit used for Data Transfer. (SCLK=8MHz @ PCLK1=48MHz) */
      BSPI1->CLK = 6;
   }
   else {
      /* Max. 400 kBit used in Card Initialization. */
      BSPI1->CLK = 120;
   }
}


/*--------------------------- spi_ss ----------------------------------------*/

void spi_ss (U32 ss) {
  /* Enable/Disable SPI Chip Select */

  if (ss) {
    GPIO0->PD |=  0x0080;
  } 
  else {
    GPIO0->PD &= ~0x0080;
  }
}


/*--------------------------- spi_send --------------------------------------*/

U8 spi_send (U8 outb) {
  /* Write and Read a byte on SPI interface */
  U8 inb;

  /* Wait if TFNE set, Tx FIFO is not empty */
  while ((BSPI1->CSR2 & BSPI_TFNE) != 0);
  BSPI1->TXR = outb << 8;

  /* Wait if RFNE cleared, Rx FIFO is empty */
  while ((BSPI1->CSR2 & BSPI_RFNE) == 0);
  inb = BSPI1->RXR >> 8;

  return (inb);
}


/*----------------------------------------------------------------------------
 * end of file
 *---------------------------------------------------------------------------*/