AT91SAM7S256

#include "project.h"

#define MAIN_OSC  18432000    // 크리스탈 속도
#define MAIN_CLK  ((MAIN_OSC*73/14)/2) // 체배기를 거친 후 속도
#define DBGU_SPEED  115200     // 디버그 유닛 속도
void Test()
{
 // Reset and disable receiver
 AT91C_BASE_DBGU->DBGU_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;

 // Disable interrupts
 AT91C_BASE_DBGU->DBGU_IDR = 0xFFFFFFFF;

 // Configure PIOs for DBGU
 AT91C_BASE_PIOA->PIO_ASR = AT91C_PA9_DRXD | AT91C_PA10_DTXD;
 AT91C_BASE_PIOA->PIO_BSR = 0;
 AT91C_BASE_PIOA->PIO_PDR = AT91C_PA9_DRXD | AT91C_PA10_DTXD;

 // === Configure serial link ===
 // Define the baud rate divisor register [BRGR = MAIN_CLK / (115200 * 16)]
 AT91C_BASE_DBGU->DBGU_BRGR = MAIN_CLK / (DBGU_SPEED * 16);
 // Define the USART mode
 AT91C_BASE_DBGU->DBGU_MR = AT91C_US_PAR_NONE | AT91C_US_CHMODE_NORMAL;

 // Disable the RX and TX PDC transfer requests
 AT91C_BASE_DBGU->DBGU_PTCR = AT91C_PDC_RXTDIS;
 AT91C_BASE_DBGU->DBGU_PTCR = AT91C_PDC_TXTDIS;

 // Enable transmitter
 AT91C_BASE_DBGU->DBGU_CR = AT91C_US_TXEN;
}

void DBGU_Write_String(const char *cData)
{
 while (0 != *cData)
 {
  while (0 == (AT91C_BASE_DBGU->DBGU_CSR & AT91C_US_TXRDY));

  AT91C_BASE_DBGU->DBGU_THR = (*cData++);
 }
}

int main()
{
 volatile unsigned int iCount = 0;

 Test();

 (*(volatile unsigned int *)0xFFFFF400) = 0x0000000F;
 (*(volatile unsigned int *)0xFFFFF410) = 0x0000000F;
 (*(volatile unsigned int *)0xFFFFF430) = 0x00000003;

 while (1)
 {
  for(iCount=0;1000000 >= iCount; ++iCount);
  (*(volatile unsigned int *)0xFFFFF430) = 0x00000001;

  DBGU_Write_String("test\n\r");

  for(iCount=0;1000000 >= iCount; ++iCount);
  (*(volatile unsigned int *)0xFFFFF434) = 0x00000001;

 }
}