usb_main.lst

针对TMS320C6000系列的DSP芯片的在线升级的源码

 143          //-------------------------
 144          // Usb0_Init
 145          //-------------------------
 146          // USB Initialization
 147          // - Initialize USB0
 148          // - Enable USB0 interrupts
 149          // - Enable USB0 transceiver
 150          // - Enable USB0 with suspend detection
 151          //
 152          void Usb0_Init(void)
 153          {
 154   1         POLL_WRITE_BYTE(POWER,  0x08);          // Force Asynchronous USB Reset
 155   1         POLL_WRITE_BYTE(IN1IE,  0x07);          // Enable Endpoint 0-2 in interrupts
 156   1         POLL_WRITE_BYTE(OUT1IE, 0x07);          // Enable Endpoint 0-2 out interrupts
 157   1         POLL_WRITE_BYTE(CMIE,   0x07);          // Enable Reset, Resume, and Suspend interrupts
 158   1      #ifdef _USB_LOW_SPEED_
                 USB0XCN = 0xC0;                         // Enable transceiver; select low speed
                 POLL_WRITE_BYTE(CLKREC, 0xA0);          // Enable clock recovery; single-step mode
                                                         // disabled; low speed mode enabled
              #else                                      
 163   1         USB0XCN = 0xE0;                         // Enable transceiver; select full speed
 164   1         POLL_WRITE_BYTE(CLKREC, 0x80);          // Enable clock recovery, single-step mode
 165   1                                                 // disabled
 166   1      #endif /* _USB_LOW_SPEED_ */
 167   1      
 168   1         EIE1 |= 0x02;                           // Enable USB0 Interrupts
 169   1         EA = 1;                                 // Global Interrupt enable
 170   1                                                 // Enable USB0 by clearing the USB Inhibit bit
 171   1         POLL_WRITE_BYTE(POWER,  0x01);          // and enable suspend detection
 172   1      }
 173          
 174          //-------------------------
 175          // Timer_Init
 176          //-------------------------
 177          // Timer initialization
 178          // - 1 mhz timer 2 reload, used to check if switch pressed on overflow and
 179          // used for ADC continuous conversion
C51 COMPILER V6.12  USB_MAIN                                                               06/09/2004 15:44:26 PAGE 4   

 180          //
 181          void Timer_Init(void)
 182          {
 183   1         TMR2CN  = 0x00;                        // Stop Timer2; Clear TF2;
 184   1      
 185   1         CKCON  &= ~0xF0;                       // Timer2 clocked based on T2XCLK;
 186   1         TMR2RL  = -(SYSCLK / 12);              // Initialize reload value
 187   1         TMR2    = 0xffff;                      // Set to reload immediately
 188   1      
 189   1         ET2     = 1;                           // Enable Timer2 interrupts
 190   1         TR2     = 1;                           // Start Timer2
 191   1      }
 192          
 193          //-------------------------
 194          // Adc_Init
 195          //-------------------------
 196          // ADC initialization
 197          // - Configures ADC for single ended continuous conversion or Timer2
 198          //
 199          void Adc_Init(void)
 200          {                 
 201   1         REF0CN  = 0x0E;                        // Enable voltage reference VREF
 202   1         AMX0P = 0x1E;                        // Positive input starts as temp sensor  
 203   1         AMX0N = 0x1F;                        // Single ended mode(negative input = gnd)
 204   1      
 205   1         ADC0CF  = 0xFC;                        // SAR Period 0x1F, Left adjusted output
 206   1      
 207   1         ADC0CN  = 0xC2;                        // Continuous converion on timer 2 overflow
 208   1                                                // with low power tracking mode on
 209   1      
 210   1         EIE1   |= 0x08;                        // Enable conversion complete interrupt
 211   1      }
 212          
 213          //-------------------------
 214          // Timer2_ISR
 215          //-------------------------
 216          // Called when timer 2 overflows, check to see if switch is pressed,
 217          // then watch for release.
 218          //
 219          void Timer2_ISR(void) interrupt 5
 220          {
 221   1         if (!(P2 & Sw1))                      // Check for switch #1 pressed
 222   1         {
 223   2            if (Toggle1 == 0)                   // Toggle is used to debounce switch
 224   2            {                                   // so that one press and release will
 225   3               Switch1State = ~Switch1State;    // toggle the state of the switch sent
 226   3               Toggle1 = 1;                     // to the host
 227   3            }
 228   2         }
 229   1         else Toggle1 = 0;                      // Reset toggle variable
 230   1      
 231   1         if (!(P2 & Sw2))                       // This is the same as above, but for Switch2
 232   1         {
 233   2            if (Toggle2 == 0)
 234   2            {  
 235   3               Switch2State = ~Switch2State;
 236   3               Toggle2 = 1;
 237   3            }
 238   2         }
 239   1         else Toggle2 = 0;
 240   1      
 241   1         TF2H = 0;                              // Clear Timer2 interrupt flag
C51 COMPILER V6.12  USB_MAIN                                                               06/09/2004 15:44:26 PAGE 5   

 242   1      }
 243          
 244          //-------------------------
 245          // Adc_ConvComplete_ISR
 246          //-------------------------
 247          // Called after a conversion of the ADC has finished
 248          // - Updates the appropriate variable for either potentiometer or temperature sensor
 249          // - Switches the Adc multiplexor value to switch between the potentiometer and temp sensor
 250          //
 251          void Adc_ConvComplete_ISR(void) interrupt 10
 252          {
 253   1         if (AMX0P == 0x1E)                  // This switches the AMUX between
 254   1         {                                     // the temperature sensor and the
 255   2            Temperature   = ADC0H;             // potentiometer pin after each
 256   2            AMX0P       = 0x07;              // conversion
 257   2         }
 258   1         else
 259   1         {
 260   2            Potentiometer = ADC0H;
 261   2            AMX0P       = 0x1E;
 262   2         }
 263   1      
 264   1         AD0INT = 0;
 265   1      }
 266          
 267          //-------------------------
 268          // Delay
 269          //-------------------------
 270          // Used for a small pause, approximately 80 us in Full Speed,
 271          // and 1 ms when clock is configured for Low Speed
 272          //
 273          void Delay(void)
 274          {
 275   1         int x;
 276   1         for(x = 0;x < 500;x)
 277   1            x++;
 278   1      }


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    307    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =     22    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)