the IRQStatus of TRF7960 is 0x00

xiaojiao liao

Other Parts Discussed in Thread: TRF7960

Sir or Miss:

When I port the TRF7960EVM Program(MSP430) to cortex m3 (ST's STM32),I have one big problem, the IRQ Register(IRQStatus) will be 0x00.

First I description my hardware and software.

Hardware:

I used the GPIOs as SPI with SS to cummunicate with the TRF7960 , and i directly connect IRQ pin to my MCU without a 1K resistor as a buffer ,the pin of MOD

is connected to GND ,and the ook is floating

Software :

I use uart to trace my program,I just port the MSP430 program,and the key fuctions and structure are the same with TRF7960 EVM's

However , I meet a problem, eveytime I read the TFR7960 IRQStatus, it will be 0x00, then i_reg = 0x02,i do not know why this happen,for example:

when i use the ISO1593 ,Configuration is below

//======================ISO1593Configuration==========

   command[0] = ChipStateControl; // turn on RF driver
   command[1] = 0x21;
   command[2] = ISOControl; // set register 0x01 for ISO15693 operation
   command[3] = 0x02;
   WriteSingle(command, 4);

delay_ms(6);

flags = 0x06; // 16 slots
// flags = 0x26; //1 slot

   command[0] = 0x00;
   InventoryRequest(command, 0); // send Inventory request
    delay_ms(5);

   command[0] = ChipStateControl; // turn off RF driver //
   command[1] = 0x01;
   WriteSingle(command, 2);
   delay_ms(5);

   command[0] = IRQStatus;
   command[1] = IRQMask;

   ReadCont(command, 2);

   printf("\r\n After finding the ISO15693 Card \r\n");
   printf("\r\n the command[0] is 0x%x",command[0]);
   printf("\r\n the command[1] is 0x%x",command[1]);

}

send_cstring("\r\n Over find ISO15693 Card! \r\n");

//====================================================

You can see I keep the style of EVM's program

in IRQ PIN InterruptHandler,i read the IRQStatus and IRQmask ,then pulse string output to UART

//====================Part of IRQ PIN InterruptHandler==========================
do
{
irqCLR(); /* PORT2 interrupt flag clear */

  Register[0] = IRQStatus; /* IRQ status register address */
Register[1] = IRQMask;  //Dummy read

     // ReadSingle(Register, 2); /* function call for single address read */
  ReadCont(Register, 2);

/* IRQ status register has to be read */

  if(*Register == 0xA0)
  { /* TX active and only 3 bytes left in FIFO */
   goto FINISH;
  }

  printf("\n\r --------------- \n\r");
  printf("\n\r IRQStatus's Register[0] is 0x%x!\n\r",Register[0]); // Show the IRQStatus to UART
  printf("\n\r IRQStatus's Register[1] is 0x%x!\n\r",Register[1]);
  printf("\n\r --------------- \n\r");

InterruptHandlerReader(&Register[0]); //
} while((GPIO_ReadInputDataBit(GPIOE,GPIO_Pin_15) & 0x01) == 0x01); // wait for IRQ PIN down,【while((irqPORT & irqPIN) == irqPIN);】
//==============================================================================

in void InterruptHandlerReader(unsigned char *Register),I pulse a string output to UART

//====================Part of InterruptHandlerReader==========================
                 /* Interrupt register not properly set */
  if(!POLLING)
  {
   /*
    * sprintf(phello, "Interrupt error. %x\n\r", *Register);
    * *send_cstring(phello);
    */
   send_cstring("Interrupt error");
   Put_byte(*Register);
  }

i_reg = 0x02; // Here !!! !!!!!!!!!!

send_cstring("\r\ni_reg = 0x02; evrytime \r\n"); // show the i_reg = 0x02 here

//==============================================

what does "Interrupt register not properly set" this means???

when I run the porogram ,the UART show this :

//=============== UART OUTPUT =======================

IRQStatus's Register[0] is 0x0!