Lpc2000

Hi,
   
  I’m using the SPI of LPC2131 to drive a memory. I decided to take advantage of the SPI interrupts. The code is described as following, but it does not enter the interrupt routine SPI_ISR (), why?
   
  Thank you very much.
  Xia Shang
   
  #define FM25L256_CS  (1 << 29)  //P0.29 is Chip Select port
   
  int main (void)
  {
         unsigned char output_buffer[8] = {1,2,3,4,5,6,7,8};
   
         PINSEL0              =    0x00005505;                 //Enable SPI0 pins
         IO0DIR                =    FM25L256_CS;                   //Enable Chipselect pin as output
   
         SPCCR                 =     0x52;                                  //Set bit timing
         SPCR                 =     (1 << 3) |                            // CPHA = 1
                                           (1 << 4) |                            // CPOL = 1
                                           (1 << 5) |                            // MSTR = 1
                                           (0 << 6) |                            // LSBF = 0
                                           (1 << 7);                             // SPIE = 1, enable interrupts
   
         VICIntSelect   =    0x00000000;
         VICVectCntl0        =    0x0000002A;               //Select a priority slot for a given interrupt
         VICVectAddr0       =    (uint32)SPI_ISR;   //Pass the address of the IRQ into the VIC slot
         VICIntEnable        =    0x00000400;                 //Enable interrupt
         
         SPI_write(output_buffer, 8 );                                                 //Write eight bytes to the memory
         while(1)
         {
         ;
         }
  }
   
  void SPI_write(unsigned char *buffer,unsigned char bytecount)
  {
         SPI_buffer            =    buffer;
         SPI_bytecount      =    bytecount;
         IO0CLR                      =    FM25L256_CS;                   //Pull Chipselect low
         SPDR                   =    0x00000006;                 //Send WREN opcode
         while(0 == (SPSR & 0x80));
         status                    =     0x01;                           //set next state
  }
   
  void __irq SPI_ISR (void) 
  {
         switch(status)
         {
                case (0x01): 
                                                                                      //Send Write opcode
                       SPDR                   =     0x00000002;                 
                       status                    =     0x02;                                  //set next state
                       break;
                
  case (0x02):
   
                       …
         }
   
         SPINT          =    0x01;                         //Signal end of interrupt
         VICVectAddr =    0x00000000;                 //Dummy write to signal end of interrupt
  }


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