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.
>
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> rtems-users mailing list
> rtems-users at rtems.org
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