spi.c

zigbee 无线收发spi接口C语言例程

/****************************************************************************
 *
 * MODULE:             Timer1.c
 *
 * COMPONENT:          $RCSfile: $
 *
 * VERSION:            $Name: $
 *
 * REVISION:           $Revision: $
 *
 * DATED:              $Date: 30/06/06  $
 *
 * STATUS:             $State: $
 *
 * AUTHOR:             Gordon MacNee
 *
 * DESCRIPTION
 * code segment to demonstrate the operation of the timers
 * running in two modes of PWM
 * no interrupts are used in these routines
 *
 * CHANGE HISTORY:
 *
 * $Log: $
 *
 *
 * LAST MODIFIED BY:   $Author: pc1 $
 *                     $Modtime: $
 *
 *
 ****************************************************************************
 *   This software is owned by Jennic and/or its supplier and is protected
 *   under applicable copyright laws. All rights are reserved. We grant you,
 *   and any third parties, a license to use this software solely and
 *   exclusively on Jennic products. You, and any third parties must
 *   reproduce the copyright and warranty notice and any other legend of
 *   ownership on each copy or partial copy of the software.
 *
 *   THIS SOFTWARE IS PROVIDED 揂S IS? JENNIC MAKES NO WARRANTIES, WHETHER
 *   EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED
 *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
 *   ACCURACY OR LACK OF NEGLIGENCE. JENNIC SHALL NOT, IN ANY CIRCUMSTANCES,
 *   BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT LIMITED TO, SPECIAL,
 *   INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR ANY REASON WHATSOEVER.
 *
 *   Copyright Jennic Ltd 2005, 2006. All rights reserved
 *
 ****************************************************************************/

/****************************************************************************/
/***        Include files                                                 ***/
/****************************************************************************/

 #include <jendefs.h>
 #include <AppHardwareApi.h>

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/***        Macro Definitions                                             ***/
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/***        Type Definitions                                              ***/
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/***        Local Function Prototypes                                     ***/
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/***        Exported Variables                                            ***/
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/***        Local Variables                                               ***/
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/****************************************************************************/
/***        Exported Functions                                            ***/
/****************************************************************************/

/****************************************************************************/
/***        Local Functions                                               ***/
/****************************************************************************/

PRIVATE void vProcessEventQueues(void);

PRIVATE void vReadFromFlash();


/****************************************************************************
 *
 * NAME: vTimerConfig
 *
 * DESCRIPTION:
 * PWM output from timer0 in Delta Sigma mode
 * with a low period of 0x8000 and a high of (0xffff - 0x8000)
 *
 * PWM output from timer1 in standard PWM mode
 * with a low period of 0x8000 and a high of (0xffff - 0x8000)
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * In this mode the period of timer0 is fixed
 * at 2^16 or 2^17 and the u16Lo the SPACE period
 ****************************************************************************/
PRIVATE void vReadFromFlash(uint32 u32Addr,
uint32 u32NumWords,
uint32 *pau32Buffer )
{
#define FLASHREADCMD 0x03
#define SPI_SLCT_NONE 0x00
uint32 u32Temp;
uint32 i;
vAHI_SpiConfigure( 1, /* number of slave select
lines in use */
E_AHI_SPIM_MSB_FIRST, /* send data MSB first */
E_AHI_SPIM_TXNEG_EDGE, /* TX data to change on
negative edge */
E_AHI_SPIM_RXNEG_EDGE, /* RX data to change on
negative edge */
0, /* Generate 16MHz SPI clock */
E_AHI_SPIM_INT_DISABLE, /* Disable SPI interrupt */
E_AHI_SPIM_AUTOSLAVE_DSABL); /* Disable auto slave select
*/
/* combine read cmd & addr into single value to be sent over SPI */
u32Temp = (u32Addr & 0x00FFFFFF) | (FLASHREADCMD << 24);
/* select spi device */
vAHI_SpiSelect(E_AHI_SPIM_SLAVE_ENBLE_0);
/* send read cmd and address location */
vAHI_SpiStartTransfer32(u32Temp);
vAHI_SpiWaitBusy();
for (i=0; i<=u32NumWords; i++)
{
/* read data 4 bytes at a time */
vAHI_SpiStartTransfer32(u32Addr);
vAHI_SpiWaitBusy();
/* copy into temp variable */
u32Temp = u32AHI_SpiReadTransfer32();
/* copy to buffer */
memcpy( (pau32Buffer+i), &u32Temp, sizeof(u32Temp) );
}
/* deselect select spi device */
vAHI_SpiSelect(SPI_SLCT_NONE);
}

/****************************************************************************
 *
 * NAME: AppWarmStart
 *
 * DESCRIPTION:
 * Entry point for a wake from sleep mode with the memory contents held. We
 * are not using this mode and so should never get here.
 *
 * PARAMETERS:      Name            RW  Usage
 * None.
 *
 * RETURNS:
 * None.
 *
 * NOTES:
 * None.
 ****************************************************************************/
PUBLIC void AppWarmStart(void)
{
    AppColdStart();
}




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/***        END OF FILE                                                   ***/
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