forked from Imagelibrary/rtems
105 lines
2.1 KiB
C
105 lines
2.1 KiB
C
/* ir.c
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*
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* Milkymist RC5 IR driver for RTEMS
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*
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* COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq
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*/
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#define RTEMS_STATUS_CHECKS_USE_PRINTK
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#include <stdlib.h>
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#include <sys/types.h>
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#include <rtems.h>
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#include <rtems/status-checks.h>
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#include <bsp.h>
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#include <bsp/irq-generic.h>
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#include <rtems/libio.h>
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#include "../include/system_conf.h"
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#include <bsp/milkymist_ir.h>
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#define DEVICE_NAME "/dev/ir"
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static rtems_id ir_q;
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static rtems_isr interrupt_handler(rtems_vector_number n)
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{
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unsigned short int msg;
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lm32_interrupt_ack(1 << MM_IRQ_IR);
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msg = MM_READ(MM_IR_RX);
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rtems_message_queue_send(ir_q, &msg, 2);
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}
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rtems_device_driver ir_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_status_code sc;
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rtems_isr_entry dummy;
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sc = rtems_io_register_name(DEVICE_NAME, major, 0);
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RTEMS_CHECK_SC(sc, "create IR input device");
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sc = rtems_message_queue_create(
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rtems_build_name('R', 'C', '5', 'Q'),
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64,
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2,
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0,
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&ir_q
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);
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RTEMS_CHECK_SC(sc, "create IR queue");
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rtems_interrupt_catch(interrupt_handler, MM_IRQ_IR, &dummy);
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bsp_interrupt_vector_enable(MM_IRQ_IR);
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver ir_open(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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uint32_t count;
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rtems_message_queue_flush(ir_q, &count);
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver ir_read(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
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rtems_status_code sc;
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if (rw_args->count < 2) {
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rw_args->bytes_moved = 0;
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return RTEMS_UNSATISFIED;
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}
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sc = rtems_message_queue_receive(
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ir_q,
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rw_args->buffer,
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(size_t *)&rw_args->bytes_moved,
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RTEMS_WAIT,
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RTEMS_NO_TIMEOUT
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);
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if(sc == RTEMS_SUCCESSFUL)
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return RTEMS_SUCCESSFUL;
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else {
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rw_args->bytes_moved = 0;
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return RTEMS_UNSATISFIED;
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}
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}
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