Installing interrupts for a custom driver

Needell Gerald jerry.needell at unh.edu
Fri Apr 4 13:33:00 UTC 2014


Alberto,
If I recall correctly, rtems_interrupt_catch  installs the new interrupt handler, but does not enable it. You will also need to call rtems_interrupt_enable.
Good luck!
Jerry

On Apr 4, 2014, at 9:12 AM, Alberto Parnaso <pafbat00 at yahoo.es> wrote:

> Hi, I am newbie in RTEMS and I am trying to install an interrupt into the interrupt controller to be capable of using an APBUART peripheral within a LEON3 based embedded processor. I configure the system so driver manager configures at BSP Start the console and the timer. I do have two APBUART configured in the system and my intention is to use the first one with console/termios driver and the second one with my own driver. Here is a copy the output of "info sys" command:
> 
> 
> <<
> grmon2> info sys
>           cpu0          Aeroflex Gaisler  LEON3 SPARC V8 Processor    
>                   AHB Master 0
>           ahbjtag0  Aeroflex Gaisler  JTAG Debug Link    
>                       AHB Master 1
>           mctrl0    European Space Agency  LEON2 Memory Controller    
>                       AHB: 00000000 - 20000000
>                       AHB: 20000000 - 40000000
>                       AHB: 40000000 - 80000000
>                       APB: 80000000 - 80000100
>                       32-bit prom @ 0x00000000
>                       32-bit static ram: 2 * 512 kbyte @ 0x40000000
>           apbmst0   Aeroflex Gaisler  AHB/APB Bridge    
>                   AHB: 80000000 - 80100000
>           dsu0      Aeroflex Gaisler  LEON3 Debug Support Unit    
>                    AHB: 90000000 - A0000000
>           CPU0:  win 8, hwbp 2, V8 mul/div, lddel 1, GRFPU-lite
>                   stack pointer 0x400ffff0
>                           icache 1 * 4 kB, 32 B/line 
>                   dcache 1 * 4 kB, 32 B/line 
>           uart0        Aeroflex Gaisler  Generic UART    
>                   APB: 80000100 - 80000200
>                   IRQ: 2
>                   Baudrate 38343
>           irqmp0    Aeroflex Gaisler  Multi-processor Interrupt Ctrl.    
>                   APB: 80000200 - 80000300
>           gptimer0  Aeroflex Gaisler  Modular Timer Unit    
>                   APB: 80000300 - 80000400
>                   IRQ: 8
>                   8-bit scalar, 2 * 32-bit timers, divisor 50
>           uart1     Aeroflex Gaisler  Generic UART    
>                   APB: 80000900 - 80000A00
>                   IRQ: 3
>                   Baudrate 38343
>           gpio0     Aeroflex Gaisler  General Purpose I/O port    
>                   APB: 80000B00 - 80000C00
> >>
> 
> I have wrote a testing app to check if both UARTs work and also to try to install a handler for RX on the second UART. Here is my code:
> 
> <<
> #include <rtems.h>
> 
> rtems_task Init( rtems_task_argument argument);    /* forward declaration needed */
> 
> /* configuration information */
> #define CONFIGURE_INIT
> #include <bsp.h> /* for device driver prototypes */
> 
> 
> #define CONFIGURE_RTEMS_INIT_TASKS_TABLE
> #define CONFIGURE_MAXIMUM_TASKS             4
> #define CONFIGURE_APPLICATION_NEEDS_CLOCK_DRIVER
> #define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
> #include <rtems/confdefs.h>
> 
> #include <stdio.h>
> #include <stdlib.h>
> 
> #include <sys/types.h>
> #include <sys/stat.h>
> #include <unistd.h>
> #include <errno.h>
> #include <apbuart.h>
> 
> // Global Variable to check if Interrupt has been signaled.
> unsigned char uc_intr_flag;
> 
> // Interrupt handler for APBUART peripheral 
> void UARTInterruptHandler ()
> {
>     uc_intr_flag = 1;
> }
> 
> rtems_task Init (rtems_task_argument ignored)
> {
> 
>     int i;
>     rtems_status_code ret_status;
>     rtems_isr_entry old_handler;
>     volatile int *apbuart1 = (int*)0x80000900;
>     volatile int aux;
> 
>     // Reset Interrupt Flag
>     uc_intr_flag = 0;
> 
>     printf("APB UART TEST with Interrupts\n");
> 
>     aux = apbuart1[1];
>     printf("APBUART1 STATUS: 0x%08X\n", aux);
>     aux = apbuart1[2];
>     printf("APBUART1 CONTROL: 0x%08X\n", aux);
>     
>     // Install UARTInterruptHandler at vector number 3 
>     ret_status = rtems_interrupt_catch(
>             (rtems_isr_entry)UARTInterruptHandler,
>             (rtems_vector_number)3,
>             &old_handler);
>     switch (ret_status)
>     {
>            case RTEMS_SUCCESSFUL :
>               printf("rtems_interrupt_catch: OK. New Interrupt installed for IRQ 3 - APBUART 2.\n");
>           break ;
> 
>            case RTEMS_INVALID_NUMBER :
>               printf("rtems_interrupt_catch: RTEMS_INVALID_NUMBER.\n");
>               break ;
> 
>            case RTEMS_INVALID_ADDRESS :
>                printf("rtems_interrupt_catch: RTEMS_INVALID_ADDRESS.\n");
>                break ;
> 
>         default :
>               printf("rtems_interrupt_catch: Unknown error.\n");
>               break ;
>     }
> 
>     // Tell uart hardware to initialize directly
>     /* Enable receiver (with interrupts) & Transmitter */
>     apbuart1[2] = APBUART_CTRL_RE | APBUART_CTRL_TE | APBUART_CTRL_RI;
>     aux = apbuart1[1];
>     printf("UART1 STATUS: 0x%02X\n", aux);
>     aux = apbuart1[2];
>     printf("UART1 CONTROL: 0x%08X\n", aux);
> 
>     // Write a character though APBUART1 to test it
>     apbuart1[0] = 0xD8;
> 
>     while (1)
>     {       // Perform some active wait time
>         for (i = 2000000; i > 0; i--);
> 
>         printf("Hello World\n");
>         apbuart1[0] = 0xD8;
>         // If interrupt received, read from APBUART
>         if (uc_intr_flag == 1)
>         {
>             uc_intr_flag = 0;
>             aux = apbuart1[0];
>             printf("Interrupt received from UART: data = %X\n", aux);
>         }
>     }
> 
>     exit (0);
> }
> >>
> 
> First UART (ie. debug UART) works fine and output data through STDOUT properly. Data sent through second UART is received also by another external terminal, and in other test I have been capable of receiving too. However UARTInterruptHandler is never signaled, thus I guess I am missing something with the interrupt instalation. 
> 
> Could any one see anything missing in this code? I would very much appreciate some help. Any clue on how to properly use interrupts will help me a lot!
> 
> Thanks!
> Alberto.
> 
> _______________________________________________
> rtems-users mailing list
> rtems-users at rtems.org
> http://www.rtems.org/mailman/listinfo/rtems-users

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