board.c

MP3播放器源代码, VS1003B

/** \file board.c
 * Board related utility functions such as delay() 
 */

#include "board.h"
#include "lcd.h"


/** Generic temp variable for non-reentrant main routines */
union Temp {
  unsigned char c;
  unsigned int i;
  unsigned long l;
} temp;


/** Read and return an octet from SPI port*/
unsigned char SPIGetChar(){
  SPIPutCharWithoutWaiting(0xff); /* send 0xff */
  SPIWait(); /* wait for the byte to transfer */
  return SPI_RESULT_BYTE; /* Return the received byte */
}
  

/** Send nClocks x 8 clock transitions with MOSI=1 (0xff) */
void SPI8Clocks(unsigned char nClocks){
  while (nClocks--){
    SPIPutCharWithoutWaiting(0xff);
    SPIWait();
  }
}


/** Busy loop delay function. Creates n times 1 ms hardware delays*/

void Delay(int milliseconds){
  for (;milliseconds;milliseconds--){  /* for n times do: */
    InitiateDelay (1000);
    WaitOutDelay(); /* 1 ms delay */
    }
}
       
/** Startup initialization of the microcontroller board */
void InitBoard()
{
  AUXR   = 0x11;           /* Take full memory into use */
  
  Mp3PutInReset();

  //  MP3_XRESET = 0;          /* Put the MP3 chip into reset */

  MMC_OFF = 1;             /* Turn mmc power off        */


  SPCON  = 0xF2;    /* Set slow spi clock        */
  CKCON0 = 0x01;    /* CPU x 2, timer2 x 1       */
  IEN0   = 0;       /* Disable all interrupts    */
  
  BDRCON = 0x1F;    /* Set uart for  115200,8n1  */
  PCON   = 0x80;    /* Double Baud Rate */
  BRL    = 248;      /* 248 for 115200 */
  SCON   = 0x50;    /* Serial Port Control Register */
  TI     = 1;
 
  ConsoleWrite ("\r\r\rBoard: Console is up.\r");

  
  TMOD = 1;


  RCAP2H = 143;     /* Set timer2 for 128 interrupts in second */
  RCAP2L = 89;
  TH2    = 143;
  TL2    = 89;
  T2CON  = 0;
  T2MOD  = 0;

  TR2 = 1;          /* Start timer2               */
  // ET2 = 1;          /* Enable timer2 interrupts   */

  //  P2 = 0xEF;
  //P3 = 0xFF;

  InitiateDelay(0); /* Initialize the Delay System */

  ConsoleWrite ("Init: Board; supports: AT89C51RD2, MMC, VS10xx, RS232\r");


  // EA  = 1;          /* Global enable for interrupts */
}