Re: Can anyone tell me where the bug is???

Hi Sasanka,

Based on your symptoms (stuck after first interrupt), I'm guessing that 
you're not clearing the transmit interrupt from the TPU.  I see code 
that clears the receive interrupt but you're going to get the transmit 
interrupt first and if you don't clear it, you'll spin in interrupt hell 
forever!

G.V.Sasanka wrote:

> Hi,
>     I am trying to work on a simple program which is an extension of 
> tpu uart function( A2371) with interrupts, I am using Phytec MPC555 
> core and codewerks metrowarrior compiler...can someone tell me where 
> the bug is...my program is getting stuck as soon as I interrupt is 
> risen..I feel...I shall ne happy if someone can clarify me whether my 
> interrpt intialization is correct...here is my program
> regards,
> Sasanka.G.V
>
> #include "mpc555.h"
> #include "mpc500_util.h"
> #include "tpu_uart.h"
> #include "UART.H"
> #define UART_BAUD_RATE 0x01b2 /* set the baud rate, ~9600 baud */
> #define UART_DATA_SIZE 0x0008 /* set data size of transmit and receive 
> data*/
> #define TICR (* (volatile unsigned short *) 0x00304008)
>
> #ifdef __cplusplus
> extern "C" {
> #endif
> void InterruptHandler(long cause);
> #ifdef __cplusplus
> }
> #endif
> #define DISABLE  asm{ mtspr EID, r0 } // Set MSR.EE
> #define ENABLE   asm{ mtspr EIE, r0 } // Clear MSR.EE
>
> struct TPU3_tag *tpua = &TPU_A;
> void main()
> {
> /* pointer for TPU routines */
> UINT8 parity_error; /* parity error flag */
> UINT8 framing_error; /* framing error flag */
> INT16 receive_data; /* received data */
> char test_message[] = "1 2 3 4 5 6 7 8 9 This is a test of the TPU 
> transmitter function";
> char store_receive_data_pointer[100]; /* place to store received data */
> int i; /* index variable */
> TICR=0x0e00;
> DISABLE
> InitPort1();                          /* set handle for the first UART */
> InitializeUART(kBaud9600);
> InitializeLED();
> SwitchGreenLEDOn();
> printf("\r\nHello \r\n");
> /* initialize channel 0 to act as a transmitter */
> tpu_uart_transmit_init(tpua, 0, TPU_PRIORITY_HIGH, UART_BAUD_RATE, 
> UART_DATA_SIZE, \
> TPU_UART_NOPARITY, TPU_UART_INTERRUPT);
> /* initialize channel 1 to act as a receiver */
> tpu_uart_receive_init(tpua, 1, TPU_PRIORITY_HIGH, UART_BAUD_RATE, 
> UART_DATA_SIZE, \
> TPU_UART_NOPARITY, TPU_UART_INTERRUPT);
> ENABLE for(i=0; test_message[i] != '\0'; i++)
> {
> tpu_uart_write_transmit_data(tpua, 0, test_message[i]); /* send data to be
> transmitted */
> SwitchGreenLEDOff();
> while((tpu_check_interrupt(tpua, 0)) != 1) /* wait for data to be 
> transmitted*/
>
> while((tpu_check_interrupt(tpua, 1)) != 1)/* check for received data 
> available */
> {
> }
> /* read received data, check for parity and framing error */
> tpu_uart_read_receive_data(tpua, 1, &receive_data, &parity_error, 
> &framing_error);
> tpu_clear_interrupt(tpua, 1); /* clear receive interrupt status 
> channel 1*/
> /* save received data read in memory, mask to eight bit data */
> store_receive_data_pointer[i] = receive_data;
> }
> store_receive_data_pointer[i] = '\0';
> printf("the stored message is \n \r");
> for(i=0; store_receive_data_pointer[i] != '\0'; i++)
> {
> printf("%c",store_receive_data_pointer[i]);
> }
> }
>
> void InterruptHandler(long cause)
> {
> static unsigned int count=100;
> switch(cause)
> {
>   case 0x500:
>    SwitchRedLEDOn();
>    if(tpu_check_interrupt(tpua, 0) == 1)
>    {
>     SwitchGreenLEDOn();
>    }
> }
> }
>
>
>
>
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-- 
Eric McRae, Electro-Logic Machines, Inc.
511 Root St., Port Townsend WA, 98368
Phone/Fax: 360.379.0969, http://www.elmi.com



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