求助: AVR中USI與SPI接口串行通訊編程例程

作者：hotpower　欄目：單片機

求助: AVR中USI與SPI接口串行通訊編程例程
在網(wǎng)上和好友那里都不找到可心的例程,十分郁悶.

想用M16的SPI(主)與T26的USI(從)進行SPI協(xié)議進行主從串行通訊,而且USI最好是采用中斷方式.

謝謝!!!

HotPower@126.com

2樓：	>>參與討論
作者： javie 于 2005/12/4 10:10:00 發(fā)布：正在實驗中...用的是M128

3樓：

>>參與討論

作者： hotpower 于 2005/12/4 11:47:00 發(fā)布：

謝謝...不會這樣簡單吧
// This file has been prepared for Doxygen automatic documentation generation.
/*! \file ********************************************************************
*
* ATMEL CORPORATION
*
* \li File:               spi_via_usi_driver.c
* \li Compiler:           IAR EWAAVR 3.10c
* \li SUPPORT mail:       avr@atmel.com
*
* \li SUPPORTed devices:  All devices with Universal Serial Interface (USI)
*                         capabilities can be used.
*                         The example is written for ATmega169.
*
* \li AppNote:            AVR319 - Using the USI MODULE for SPI communication.
*
* \li DESCRIPTION:        Example on how to use the USI MODULE for communicating
*                         with SPI compatible devices. The functions and variables
*                         prefixed 'spiX_' can be renamed to be able to use several
*                         spi drivers (using different interfaces) with similar names.
*                         Some basic SPI knowledge is assumed.
*
*                         $Revision: 1.4 $
*                         $Date: Monday, September 13, 2004 12:08:54 UTC $
****************************************************************************/
#include <ioavr.h>
#include <inavr.h>

/* USI port and pin definitions.
*/
#define USI_OUT_REG    PORTE    //!< USI port OUTPUT register.
#define USI_IN_REG    PINE    //!< USI port input register.
#define USI_DIR_REG    DDRE    //!< USI port direction register.
#define USI_CLOCK_PIN    PE4    //!< USI clock I/O pin.
#define USI_DATAIN_PIN    PE5    //!< USI data input pin.
#define USI_DATAOUT_PIN    PE6    //!< USI data OUTPUT pin.

/*  Speed configuration:
*  Bits per second = CPUSPEED / PRESCALER / (COMPAREVALUE+1) / 2.
*  Maximum = CPUSPEED / 64.
*/
#define TC0_PRESCALER_VALUE 256    //!< Must be 1, 8, 64, 256 or 1024.
#define TC0_COMPARE_VALUE   1    //!< Must be 0 to 255. MINIMUM 31 with prescaler CLK/1.

/*  Prescaler VALUE converted to bit settings.
*/
#if TC0_PRESCALER_VALUE == 1
    #define TC0_PS_SETTING (1<<CS00)
#elif TC0_PRESCALER_VALUE == 8
    #define TC0_PS_SETTING (1<<CS01)
#elif TC0_PRESCALER_VALUE == 64
    #define TC0_PS_SETTING (1<<CS01)|(1<<CS00)
#elif TC0_PRESCALER_VALUE == 256
    #define TC0_PS_SETTING (1<<CS02)
#elif TC0_PRESCALER_VALUE == 1024
    #define TC0_PS_SETTING (1<<CS02)|(1<<CS00)
#else
    #error Invalid T/C0 prescaler setting.
#endif

/*! \brief  Data input register buffer.
*
*  Incoming bytes are stored in this byte until the next transfer is complete.
*  This byte can be used the same way as the SPI data register in the native
*  SPI MODULE, which means that the byte must be read before the next transfer
*  completes and overwrites the current VALUE.
*/
unsigned CHAR storedUSIDR;

/*! \brief  Driver status bit structure.
*
*  This struct contains status flags for the driver.
*  The flags have the same meaning as the corresponding status flags
*  for the native SPI MODULE. The flags should not be changed by the user.
*  The driver takes care of updating the flags when required.
*/
struct usidriverStatus_t {
    unsigned CHAR MASTERMode : 1;       //!< True if in MASTER mode.
    unsigned CHAR transferComplete : 1; //!< True when transfer completed.
    unsigned CHAR writeCollision : 1;   //!< True if put attempted during transfer.
};

volatile struct usidriverStatus_t spiX_status; //!< The driver status bits.

/*! \brief  Timer/Counter 0 Compare Match Interrupt handler.
*
*  This interrupt handler is ONLY enabled when transferring data
*  in MASTER mode. It toggles the USI clock pin, i.e. two interrupts
*  results in one clock period on the clock pin and for the USI counter.
*/
#pragma vector=TIMER0_COMP_vect
__interrupt void timer0comp_handler()
{
    USICR |= (1<<USITC);    // Toggle clock OUTPUT pin.
}

/*! \brief  USI Timer Overflow Interrupt handler.
*
*  This handler disables the compare match interrupt if in MASTER mode.
*  When the USI counter overflows, a byte has been transferred, and we
*  have to stop the timer tick.
*  For all modes the USIDR contents are stored and flags are updated.
*/
#pragma vector=USI_OVF_vect
__interrupt void usiovf_handler() //USI計數(shù)器溢出中斷程序
{
    // MASTER must now disable the compare match interrupt
    // to prevent more USI counter clocks.
    if( spiX_status.MASTERMode == 1 ) {
        TIMSK0 &= ~(1<<OCIE0A);
    }

    // Update flags and clear USI counter
    USISR = (1<<USIOIF); //清除計數(shù)器溢出標志
    spiX_status.transferComplete = 1;

    // Copy USIDR to buffer to prevent overwrite on next transfer.
    storedUSIDR = USIDR; //讀USI接收數(shù)據(jù)
}

/*! \brief  Initialize USI as SPI MASTER.
*
*  This function sets up all pin directions and MODULE configurations.
*  Use this function initially or when changing from slave to MASTER mode.
*  Note that the stored USIDR VALUE is cleared.
*
*  \param spi_mode  Required SPI mode, must be 0 or 1.
*/
void spiX_initMASTER( CHAR spi_mode )
{
    // Configure port directions.
  &nbs

4樓：	>>參與討論
作者： javie 于 2005/12/4 14:42:00 發(fā)布：狂ft。。。

5樓：	>>參與討論
作者： hotpower 于 2005/12/4 19:02:00 發(fā)布：暈到,在水池里做完實驗否???

6樓：	>>參與討論
作者： javie 于 2005/12/4 20:49:00 發(fā)布：不敢了... 北京冷死了零下9度

參與討論

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求助: AVR中USI與SPI接口串行通訊編程例程