Installing interrupts for a custom driver
Needell Gerald
jerry.needell at unh.edu
Fri Apr 4 14:25:35 UTC 2014
Alberto,
This may not have been correct- Take a look at the c/src/lib/libbsp/sparc/leon3/startup/setec.c function from the LEON3 BSP (RTEMS 4.9.2) - attached:
After calling rtems_catch_interrupt the LEON3 interrupt is then enabled - I install my handlers as a type=1 RTEMS interrupt.
I hope that helps
- Jerry
/* set_vector
*
* This routine installs an interrupt vector on the SPARC simulator.
*
* INPUT PARAMETERS:
* handler - interrupt handler entry point
* vector - vector number
* type - 0 indicates raw hardware connect
* 1 indicates RTEMS interrupt connect
*
* OUTPUT PARAMETERS: NONE
*
* RETURNS:
* address of previous interrupt handler
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* Ported to LEON implementation of the SPARC by On-Line Applications
* Research Corporation (OAR) under contract to the European Space
* Agency (ESA).
*
* LEON modifications of respective RTEMS file: COPYRIGHT (c) 1995.
* European Space Agency.
*
* $Id: setvec.c,v 1.2 2006/01/09 10:41:21 ralf Exp $
*/
#include <bsp.h>
rtems_isr_entry set_vector( /* returns old vector */
rtems_isr_entry handler, /* isr routine */
rtems_vector_number vector, /* vector number */
int type /* RTEMS or RAW intr */
)
{
rtems_isr_entry previous_isr;
uint32_t real_trap;
uint32_t source;
if ( type )
rtems_interrupt_catch( handler, vector, &previous_isr );
else
_CPU_ISR_install_raw_handler( vector, handler, (void *)&previous_isr );
real_trap = SPARC_REAL_TRAP_NUMBER( vector );
if ( LEON_INT_TRAP( real_trap ) ) {
source = LEON_TRAP_SOURCE( real_trap );
LEON_Clear_interrupt( source );
LEON_Unmask_interrupt( source );
}
return previous_isr;
}
On Apr 4, 2014, at 9:33 AM, Needell Gerald <jerry.needell at unh.edu> wrote:
> 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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