280x_spi.c

针对TIDSP 280X 编写的通讯程序模块；可以拿来直接用。包括

/*spi communicate sub with ti 280x dsp
written by wangweiwei
*/

#include "DSP280x_Device.h"     // DSP280x Headerfile Include File
#include "DSP280x_Examples.h"   // DSP280x Examples Include File

//---------------------------------------------------------------------------
// InitSPI: 
//---------------------------------------------------------------------------
// This function initializes the SPI(s) to a known state.
//
void InitSpi(void)
{
   // Initialize SPI-A/B/C/D

   //tbd...
 
}

//---------------------------------------------------------------------------
// Example: InitSpiGpio: 
//---------------------------------------------------------------------------
// This function initializes GPIO pins to function as SPI pins
//
// Each GPIO pin can be configured as a GPIO pin or up to 3 different
// peripheral functional pins. By default all pins come up as GPIO
// inputs after reset.  
// 
// Caution: 
// For each SPI peripheral
// Only one GPIO pin should be enabled for SPISOMO operation.
// Only one GPIO pin should be enabled for SPISOMI operation. 
// Only one GPIO pin should be enabled for SPICLKA operation. 
// Only one GPIO pin should be enabled for SPISTEA operation. 
// Comment out other unwanted lines.

void InitSpiGpio()
{

   InitSpiaGpio();
   InitSpibGpio();
#if DSP28_2808 || DSP28_2806     
   InitSpicGpio();
   InitSpidGpio();
#endif // endif DSP28_2808 || DSP28_2806     
}

void InitSpiaGpio()
{

   EALLOW;
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled by the user.  
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;   // Enable pull-up on GPIO16 (SPISIMOA)
    GpioCtrlRegs.GPAPUD.bit.GPIO17 = 0;   // Enable pull-up on GPIO17 (SPISOMIA)
    GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;   // Enable pull-up on GPIO18 (SPICLKA)
    GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0;   // Enable pull-up on GPIO19 (SPISTEA)


/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // Asynch input GPIO16 (SPISIMOA)
    GpioCtrlRegs.GPAQSEL2.bit.GPIO17 = 3; // Asynch input GPIO17 (SPISOMIA)
    GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // Asynch input GPIO18 (SPICLKA)
    GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3; // Asynch input GPIO19 (SPISTEA)
    
/* Configure SPI-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SPI functional pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1; // Configure GPIO16 as SPISIMOA
    GpioCtrlRegs.GPAMUX2.bit.GPIO17 = 1; // Configure GPIO17 as SPISOMIA
    GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1; // Configure GPIO18 as SPICLKA
    GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 1; // Configure GPIO19 as SPISTEA

    EDIS;
}

void InitSpibGpio()
{
   EALLOW;
    	
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.  
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0;     // Enable pull-up on GPIO12 (SPISIMOB)
//  GpioCtrlRegs.GPAPUD.bit.GPIO24 = 0;     // Enable pull-up on GPIO24 (SPISIMOB)

    GpioCtrlRegs.GPAPUD.bit.GPIO13 = 0;     // Enable pull-up on GPIO13 (SPISOMIB)                                                                           
//  GpioCtrlRegs.GPAPUD.bit.GPIO25 = 0;     // Enable pull-up on GPIO25 (SPISOMIB)

    GpioCtrlRegs.GPAPUD.bit.GPIO14 = 0;     // Enable pull-up on GPIO14 (SPICLKB)                                                                           
//  GpioCtrlRegs.GPAPUD.bit.GPIO26 = 0;     // Enable pull-up on GPIO26 (SPICLKB) 

    GpioCtrlRegs.GPAPUD.bit.GPIO15 = 0;     // Enable pull-up on GPIO15 (SPISTEB)                                                                           
//  GpioCtrlRegs.GPAPUD.bit.GPIO27 = 0;     // Enable pull-up on GPIO27 (SPISTEB) 

    
/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAQSEL1.bit.GPIO12 = 3;   // Asynch input GPIO12 (SPISIMOB)
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO24 = 3;   // Asynch input GPIO24 (SPISIMOB)

    GpioCtrlRegs.GPAQSEL1.bit.GPIO13 = 3;   // Asynch input GPIO13 (SPISOMIB)                                                                                       
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO25 = 3;   // Asynch input GPIO25 (SPISOMIB)

    GpioCtrlRegs.GPAQSEL1.bit.GPIO14 = 3;   // Asynch input GPIO14 (SPICLKB)                                                                                        
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO26 = 3;   // Asynch input GPIO26 (SPICLKB) 

    GpioCtrlRegs.GPAQSEL1.bit.GPIO15 = 3;   // Asynch input GPIO15 (SPISTEB)                                                                                        
//  GpioCtrlRegs.GPAQSEL2.bit.GPIO27 = 3;   // Asynch input GPIO27 (SPISTEB) 

/* Configure SPI-B pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SPI functional pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 3;    // Configure GPIO12 as SPISIMOB
//  GpioCtrlRegs.GPAMUX2.bit.GPIO24 = 3;    // Configure GPIO24 as SPISIMOB
         
    GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 3;    // Configure GPIO13 as SPISOMIB     
//  GpioCtrlRegs.GPAMUX2.bit.GPIO25 = 3;    // Configure GPIO25 as SPISOMIB         

    GpioCtrlRegs.GPAMUX1.bit.GPIO14 = 3;    // Configure GPIO14 as SPICLKB     
//  GpioCtrlRegs.GPAMUX2.bit.GPIO26 = 3;    // Configure GPIO26 as SPICLKB         

    GpioCtrlRegs.GPAMUX1.bit.GPIO15 = 3;    // Configure GPIO15 as SPISTEB     
//  GpioCtrlRegs.GPAMUX2.bit.GPIO27 = 3;    // Configure GPIO27 as SPISTEB         

    EDIS;
}   

#if DSP28_2808 || DSP28_2806
void InitSpicGpio()
{
   EALLOW;
    	
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.  
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAPUD.bit.GPIO20 = 0;   // Enable pull-up on GPIO20 (SPISIMOC)
    GpioCtrlRegs.GPAPUD.bit.GPIO21 = 0;   // Enable pull-up on GPIO21 (SPISOMIC)                                                                                                             
    GpioCtrlRegs.GPAPUD.bit.GPIO22 = 0;   // Enable pull-up on GPIO22 (SPICLKC)                                                                                                             
    GpioCtrlRegs.GPAPUD.bit.GPIO23 = 0;   // Enable pull-up on GPIO23 (SPISTEC)                                                                                                             
    
/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAQSEL2.bit.GPIO20 = 3;   // Asynch input GPIO20 (SPISIMOC)
    GpioCtrlRegs.GPAQSEL2.bit.GPIO21 = 3;   // Asynch input GPIO21 (SPISOMIC)                                                                                                                           
    GpioCtrlRegs.GPAQSEL2.bit.GPIO22 = 3;   // Asynch input GPIO22 (SPICLKC)                                                                                                                            
    GpioCtrlRegs.GPAQSEL2.bit.GPIO23 = 3;   // Asynch input GPIO23 (SPISTEC)                                                                                                                            

/* Configure SPI-C pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SPI functional pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAMUX2.bit.GPIO20 = 2;   // Configure GPIO20 as SPISIMOC
    GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 2;   // Configure GPIO21 as SPISOMIC     
    GpioCtrlRegs.GPAMUX2.bit.GPIO22 = 2;   // Configure GPIO22 as SPICLKC    
    GpioCtrlRegs.GPAMUX2.bit.GPIO23 = 2;   // Configure GPIO23 as SPISTEC     

    EDIS;
}
#endif // endif DSP28_2808 || DSP28_2806   


#if DSP28_2808 || DSP28_2806
void InitSpidGpio()
{
   EALLOW;
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.  
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0;    // Enable pull-up on GPIO1 (SPISIMOD)
    GpioCtrlRegs.GPAPUD.bit.GPIO3 = 0;    // Enable pull-up on GPIO3 (SPISOMID)  
    GpioCtrlRegs.GPAPUD.bit.GPIO5 = 0;    // Enable pull-up on GPIO5 (SPICLKD)                                                                                                                       
    GpioCtrlRegs.GPAPUD.bit.GPIO7 = 0;    // Enable pull-up on GPIO7 (SPISTED)                                                                                                                       
    
/* Set qualification for selected pins to asynch only */
// This will select asynch (no qualification) for the selected pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAQSEL1.bit.GPIO1 = 3;   // Asynch input GPIO1 (SPISIMOD)
    GpioCtrlRegs.GPAQSEL1.bit.GPIO3 = 3;   // Asynch input GPIO3 (SPISOMID)                                                                                                                                     
    GpioCtrlRegs.GPAQSEL1.bit.GPIO5 = 3;   // Asynch input GPIO5 (SPICLKD)                                                                                                                                      
    GpioCtrlRegs.GPAQSEL1.bit.GPIO7 = 3;   // Asynch input GPIO7 (SPISTED)                                                                                                                                      

/* Configure SPI-D pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SPI functional pins.
// Comment out other unwanted lines.

    GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 2;   // Configure GPIO1 as SPISIMOD
    GpioCtrlRegs.GPAMUX1.bit.GPIO3 = 2;   // Configure GPIO3 as SPISOMID     
    GpioCtrlRegs.GPAMUX1.bit.GPIO5 = 2;   // Configure GPIO5 as SPICLKD   
    GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 2;   // Configure GPIO7 as SPISTED     

    EDIS;
}   
#endif // endif DSP28_2808 || DSP28_2806  



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