tms470.c

来自「最新版IAR FOR ARM（EWARM）5.11中的代码例子」· C语言 代码 · 共 179 行

#ifdef R1A384
#include <TexasInstruments/iotms470r1a384.h>
#else
#include <TexasInstruments/iotms470r1a256.h>
#endif

#define SYSCLK_8MHz  0
#define SYSCLK_20MHz 1
#define SYSCLK_40MHz 2

int sysclk;

static void(*timer_function)();


//
// System initialization.
//


void TMS470SystemInit()
{
  PCR_bit.CLKDIV = 0x0F;  // set ICLK
  PCR_bit.PENABLE = 1;    // enable peripherals
}


//
// Interrupt handlers.
//

 /* Timer interrupt handler */
__irq __arm void IRQ_Handler()
{
  volatile int vecno;

  vecno = CIMIVEC;     // read and clear interrupt

  RTICNTEN = 0x03;     // Stop counting
  RTICNTR = 0;         // clear 21-bits CNTR

  RTICINT = 0x20;   // interrupt control, clear CMP1 and enable CMP1 interrupt
  RTICNTEN = 0x00;  // Start count, CNTR and MOD will count in both USER and SYSTEM mode

  (*timer_function)(); // Call timer callback function.
}


//
// Interrupt functions.
//

void TMS470InitInterrupt(void(*timer_func)())
{
  timer_function = timer_func;

  // Setup interrupt controller.
  REQMASK |= (1<<2);    // Enable channel 2  (RTICMP1)
}


//
// Timer functions.
//

void TMS470InitTimer()
{
  // 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 1000 us interrupt.

  RTIPCTL = 1;     // preload 11-bits MOD

  RTICMP1 = 3689;  // osc is 14.7456 MHz

  RTICNTL = 0;     // clear and disable tap

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


void TMS470StartTimer()
{
  // Start count, CNTR and MOD will count in both USER and SYSTEM mode
  RTICNTEN = 0x00;
}



//
// Parallel I/O functions.
//


void TMS470InitPIO()
{

#ifdef R1A384

  GIODIRA = 0xF0;  // set port bit 7..4 as output
  GIODIRH = 0x1E;  // set port bit 4..1 as output
  HETDIR  = 0xFF;  // set port bit 7..0 as output

  GIODOUTA = 0xF0;  // off
  GIODOUTH = 0x1E;
  HETDOUT = 0xFF;

  HETDOUT = 0x00;  // on
  GIODOUTH = 0x00;
  GIODOUTA = 0x00;

  HETDOUT = 0xFF;  // off
  GIODOUTH = 0x1E;
  GIODOUTA = 0xF0;

#else

  // R1A256
  HETDIR  = 0xFFFFFFFF;  // set port bit 7..0 as output

  HETDOUT = 0xFFFFFFFF;

  HETDOUT = 0x00000000;  // on
  HETDOUT = 0xFFFFFFFF;  // off

#endif

}


//
// LED output drivers.
//

void TMS470LedSet(unsigned int mask)
{
#ifdef R1A384
  mask ^= 0xFFFFFFFF;

  HETDOUT = (mask >> 8) & 0xFF;
  GIODOUTH = (mask >> 3) & 0x1E;
  GIODOUTA = (mask << 4) & 0xF0;

#else
  // R1A256
  unsigned long out = 0;

  mask ^= 0xFFFFFFFF;

  out |= ((mask & 0x01)   ? 0x00000001 : 0);
  out |= ((mask & 0x02)   ? 0x00000004 : 0);
  out |= ((mask & 0x04)   ? 0x00000010 : 0);
  out |= ((mask & 0x08)   ? 0x00000040 : 0);
  out |= ((mask & 0x10)   ? 0x00000080 : 0);
  out |= ((mask & 0x20)   ? 0x00000100 : 0);
  out |= ((mask & 0x40)   ? 0x00000400 : 0);
  out |= ((mask & 0x80)   ? 0x00000800 : 0);
  out |= ((mask & 0x100)  ? 0x00001000 : 0);
  out |= ((mask & 0x200)  ? 0x00002000 : 0);
  out |= ((mask & 0x400)  ? 0x00040000 : 0);
  out |= ((mask & 0x800)  ? 0x00080000 : 0);
  out |= ((mask & 0x1000) ? 0x00100000 : 0);
  out |= ((mask & 0x2000) ? 0x00200000 : 0);
  out |= ((mask & 0x4000) ? 0x01000000 : 0);
  out |= ((mask & 0x8000) ? 0x80000000 : 0);

  HETDOUT = out;

#endif

}