tms470r1a256_spi_06.c

tmp470开发板的源程序

//*****************************************************************************
//  TMS470 Demo -  SPI Sample Program master 5pin rti
//
// This is a SPI 5 pin - Slave Mode - RTI Interrupt configuration.
// Data from a table is transmitted from SPI 1 based on the RTI timing.
// This is a 5 pin configuration using SIMO SPICLK SOMI SCS ENA pins. Clock speed 12 Mhz.
//
//
//                              TMS-FET470A256
//                             _________________
//                            |                 |
//                         /|\|            OSCIN|-
//                          | |                 | 12MHz
//                          --|PLLDIS     OSCOUT|-
//                            |                 |
//                         ---|SPICLK       SIMO|---
//                            |                 |
//                         ---|ENA          SOMI|---
//                            |                 |
//                            |              SCS|---
//                            |                 |
//                            |_________________|
//
//
//
//
//
//  J. Mangino/A. Dannenberg
//  Texas Instruments, Inc
//  January 2005
//  Built with IAR Embedded Workbench Version: 4.11A
//******************************************************************************

#include <intrinsic.h>
#include "iotms470r1a256.h"
#include "tms470r1a256_bit_definitions.h"

// LED moving pattern codes.
 int led_table[] = {
   0x0000,0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0040,0x0080,0x0100,0x0200,0x0400,0x0800,0x1000,0x2000,0x4000,0x8000, 0xffff
};

 unsigned int datp;
   int* ip;

 void COMP1_irq_handler()
{
  RTICINT = 0x00;                       // interrupt control, clear CMP1 and enable CMP1 interrupt
  RTICINT = 0x20;

  if (*ip != 0xffff)
  {
  SPI1DAT1 = *ip;
  ip++;
}
 else
 {
  ip = led_table;
  SPI1DAT1 = *ip;
  ip++;
  }
}

//------------------------------------------------------------------------------
// TMS470R1A256 Standard Interrupt Handler
//------------------------------------------------------------------------------
#pragma vector = IRQV
__irq __arm void irq_handler(void)
{
   switch((0xff & IRQIVEC)-1)
  {
   case CIM_COMP1  : COMP1_irq_handler(); break;
  }
}

void main(void)
{
// Set up peripheral registers.
// First disable interrupts.
  __disable_interrupt();
  ip = led_table;
    // Setup system.
  PCR = CLKDIV_4;                        // ICLK = SYSCLK/4
  PCR |= PENABLE;                        // enable peripherals


  REQMASK = (1 << CIM_COMP1);        // Enable SPI Interrupt mask

  // Setup periodic interrupt using RTI with RTICMP1
  RTICNTEN = 0x03;                       // Stop counting
  RTICNTR = 0;                           // clear 21-bits CNTR

  // Setup periodic interrupt timer
  // CMP1 used to generate  interrupt.
  RTIPCTL = 0x3;                         // preload 11-bits MOD
  RTICMP1 = 0xfffff;                     //
  RTICNTL = 0x00;                        // clear and disable tap

  // interrupt control, clear CMP1 and enable CMP1 interrupt
  RTICINT = 0x00;
  RTICINT = 0x20;


  // Start count, CNTR and MOD will count in both USER and SYSTEM mode
  RTICNTEN = 0x00;

  HETDIR  = 0xffffffff;                  // Set HET as GIO outputs
  HETDOUT = 0x813c3dd5;                  // Output off
  HETDOUT = 0x00000000;                  // Output on
  HETDOUT = 0x813c3dd5;                  // Output off

  // SPI 1 Setup

  SPI1CTRL1= CHARLEN_16 + PRESCALE_1;    // char len = 16 prescale =1 spi baud =Iclk/2
  SPI1CTRL2 = MASTER + CLKMOD;           // Master mode
  SPI1CTRL3 = 0x00;                      // Disable SPI1 Interrupt
  SPI1PC6=SOMI_FUN + SIMO_FUN + CLK_FUN + SCS_FUN + ENA_FUN; //0x0e;          // SIMO SPICLK ENA enables
  SPI1CTRL2 |= SPIEN;                    // Enable  SPIs

  datp = SPI1BUF;                        // Dummy Read to clear buffer

   __enable_interrupt();                 // Enable Interrupts

  // Loop forever.
  while (1);

}