spi_drv.c

手机GSM TI 平台 同步串口SPI 驱动 源代码

/**********************************************************************************/
/*            TEXAS INSTRUMENTS INCORPORATED PROPRIETARY INFORMATION              */
/*                                                                                */
/*   Property of Texas Instruments -- For  Unrestricted  Internal  Use  Only      */
/*   Unauthorized reproduction and/or distribution is strictly prohibited.  This  */
/*   product  is  protected  under  copyright  law  and  trade  secret law as an  */
/*   unpublished work.  Created 1987, (C) Copyright 1997 Texas Instruments.  All  */
/*   rights reserved.                                                             */
/*                                                                                */
/*                                                                                */
/*   Filename          : spi_drv.c                                                */
/*                                                                                */
/*   Description       : Functions to drive the SPI module.                       */
/*                       The Serial Port Interface is a bidirectional 3 lines 	  */
/*                       interface dedicated to the transfer of data to and 	  */
/*                       from up to 5 external devices offering a 3 lines 		  */
/*                       serial interface.										  */
/*						 In this project, it is only used to connect the TI 	  */
/*						 Analog BaseBand (ABB).				    				  */
/*						 It is assumed that the ABB is connected as the SPI       */																				  
/*                       device 0.                                                */																				  
/*																				  */
/*                       This interface is specified to be compatible with 		  */
/*                       the UMA1018M Philips, the FUJITSU MB15F02, the 		  */
/*                       SIEMENS PMB2306T synthesizers and the TI ABB.			  */
/*																				  */
/*                       This serial port is based on a looped shift-register 	  */
/*                       thus allowing both transmit (PISO) and receive (SIPO) 	  */
/*                       modes.													  */
/*																				  */
/*                                                                                */
/*   Author            : Pascal PUEL                                              */
/*                                                                                */
/*   Version number   : 1.45                                                       */
/*                                                                                */
/*   Date and time    : 07/01/03                                                       */
/*                                                                                */
/*   Previous delta   : Rework                                                    */
/*                                                                                */
/**********************************************************************************/

#include "spi/spi_drv.h"



/*-----------------------------------------------------------------------*/
/* SPI_InitDev()                                                         */
/*                                                                       */
/* This function initializes the SPI registers for an external device    */
/* connected to the serial port.                                         */
/*                                                                       */
/*-----------------------------------------------------------------------*/    
void SPI_InitDev(T_SPI_DEV *Device)
{
  unsigned short Param,Gate,Shiftval;
  unsigned short Mask = 0x7bde;

  /* Clock enable, mask ITs and pre scale setting */
  * (volatile SYS_UWORD16 *) SPI_REG_SET1 = (SPI_CLK_ON | Device->PrescVal | SPI_IT_MASK_0 | SPI_IT_MASK_1);

  /* Building the parameter for REG_SET2 initialization */
  Shiftval = Device->DevId >> 7;
  Param = (Device->ClkEdge | Device->TspEnLevel | Device->TspEnForm)<<Shiftval ;
  Gate = Mask<<Shiftval;   
  
  * (volatile SYS_UWORD16 *) SPI_REG_SET2 = (* (volatile SYS_UWORD16 *) SPI_REG_SET2 & Gate) | Param;


  /* Configuring CTRL_REG : this writting erases the previous one */
  * (volatile SYS_UWORD16 *) SPI_REG_CTRL = (Device->DataTrLength | Device->DevId);

  /* Stop the SPI clock */
  #ifdef SPI_CLK_LOW_POWER    
    SPI_CLK_DISABLE
  #endif
}