hw.c

UC/OS下的USB驱动程序和说明文档（包括上位机驱动程序和固件程序）

/*
**********************************************************************
*                          Micrium, Inc.
*                      949 Crestview Circle
*                     Weston,  FL 33327-1848
*
*                           uC/USB-Bulk
*
*             (c) Copyright 2003 - 2004, Micrium, Inc.
*                      All rights reserved.
*
***********************************************************************

--------- END-OF-HEADER ---------------------------------*/

#include "RTOS.H"
#include "IOM30245.h"

/*********************************************************************
*
*       Local functions
*
**********************************************************************
*/

/*********************************************************************
*
*       StartPll
*
*  DESCRIPTION: Starts the onboard PLL for the USB core's use. 
*
*  RETURNS: Nothing
*/

static void _StartPll(void) {
  unsigned char DelayOne = 0xff;    // Temporary delay variables
  unsigned char DelayTwo = 0xff;
  PRCR = 0x03;      // Disable protection of the clock & PLL registers
  FSP  = 0x01;      // Xin = 16MHz -> Fpin = 4MHz
  FSM  = 0x05;      // Fpin = 4MHz -> Fvco/Fusb = 48MHz
  FSD  = 0x01;      // Fvco = 48MHz -> Fsyn = 12MHz (if necessary)
  FSC  = 0x43;      // debug....
  while ( DelayTwo != 0 ){      // Simple DO->WHILE to count while the 
    while ( DelayOne != 0 ){    // PLL comes online and stabilizes
      DelayOne--;               // These values should give us a delay of
    }                           // Approxiamtely 3mS or so before we check
    DelayOne = 0xff;            // Reload small delay   
    DelayTwo--;                 // and one tick off large delay
  }
  while ( !(FSC & (1<<7)) ){    // Check to see if PLL is locked in 
    DelayOne = 0x32;            // if not wait 0.1 mS and check again
    DelayTwo = 0x0b;     
    while ( DelayTwo != 0){     // Simple DO->WHILE to count while the 
      while ( DelayOne != 0 ){   
        DelayOne--;             // These values should give us a delay of  
      }                         // Approxiamtely 0.1 mS or before we check   
      DelayOne = 0xff;          // Reload small delay        
      DelayTwo--;               // and one tick off large delay 
    }            
  }
}


/*********************************************************************
*
*       Global functions
*
**********************************************************************
*/


/*********************************************************************
*
*       __low_level_init(void)
*
*  DESCRIPTION: Loads default values into specific registers for startup
*        mainly used for Vbus detect to provide signal that the 
*        device is ready to run USB operations.
*
*  RETURNS: 1 to tell startup-code to initilize segments
*           0 to tell startup-code not to initialize segments
*/

unsigned char __low_level_init(void){
  PRCR = 0x03;     // Disable protection of the clock & PLL registers
  CM0  = 0x08;     // Enable CM16 & CM17 for high speed mode
  CM1  = 0x00;     // BCLK/1. Should = 16MHz
  PRCR = 0x00;     // Enable protection of the clock & PLL registers

  PUR2 |= (1<<0);  // Enable pullups on P8_0 to P8_4
  PUR2 |= (1<<5);  // Enable pullups on P10_4-P10_7
  USBAD = 0x81;    // Enable P90 for D+ pullup and enable Vbus detect
//  VBDIC = 0;       // Clear the Vbus detect interrupt (per spec)
//  VBDIC = 0x04;    // Enable the Vbus detect interrupt (level 4)
  _StartPll();
  // Enable USB core
  USBC = 0x20;     // Enable USB core clock
  USBC = 0xe0;     // Enable USB core clock & SOF output

//  Purpose: Initialize Hardware of JTAG interface to target. Set all outputs to
//  default values.
//  Initialize Ports used for JTAG / target interface

  PUR0 = (0<<7)    // Pull-Up port P34..P37
        |(0<<6)    // Pull-Up port P30..P33
        |(1<<5)    // Pull-Up port P24..P27          
        |(1<<4)    // Pull-Up port P20..P23                    
        |(0<<3)    // Pull-Up port P14..P17          
        |(0<<2)    // Pull-Up port P10..P13          
        |(0<<1)    // Pull-Up port P04..P07          
        |(0<<0);   // Pull-Up port P00..P03          
   P7D  = (0<<7)    // Not used, input
        |(0<<6)    // Not used, input
        |(0<<5)    // Not used, input
        |(0<<4)    // Not used, input
        |(1<<3)    // LED,      output
        |(0<<2)    // Not used, input
        |(0<<1)    // Not used, input
        |(0<<0);   // Not used, input
 return 1;
}


/*********************************************************************
*
*       LED functions 
*/
void HW_SetLED0(void)    { P7 &= ~(1<<3); }
void HW_ClrLED0(void)    { P7 |=  (1<<3); }
void HW_ToggleLED0(void) { P7 ^=  (1<<3); }



/****** EOF *********************************************************/