forked from Imagelibrary/rtems
131 lines
2.8 KiB
C
131 lines
2.8 KiB
C
/* buttons.c
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*
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* Buttons driver for the Milkymist One board
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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) 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 <stdio.h>
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#include <errno.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_buttons.h>
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#define DEVICE_NAME "/dev/buttons"
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static rtems_id event_q;
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static void send_byte(char b)
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{
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rtems_message_queue_send(event_q, &b, 1);
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}
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static rtems_isr interrupt_handler(rtems_vector_number n)
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{
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static unsigned int previous_keys;
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unsigned int keys, pushed_keys, released_keys;
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keys = MM_READ(MM_GPIO_IN) & (GPIO_BTN1|GPIO_BTN2|GPIO_BTN3);
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pushed_keys = keys & ~previous_keys;
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released_keys = previous_keys & ~keys;
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previous_keys = keys;
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if(pushed_keys & GPIO_BTN1)
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send_byte('A');
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if(pushed_keys & GPIO_BTN2)
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send_byte('B');
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if(pushed_keys & GPIO_BTN3)
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send_byte('C');
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if(released_keys & GPIO_BTN1)
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send_byte('a');
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if(released_keys & GPIO_BTN2)
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send_byte('b');
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if(released_keys & GPIO_BTN3)
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send_byte('c');
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lm32_interrupt_ack(1 << MM_IRQ_GPIO);
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}
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rtems_device_driver buttons_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 buttons device");
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sc = rtems_message_queue_create(
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rtems_build_name('B', 'T', 'N', 'Q'),
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24,
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1,
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0,
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&event_q
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);
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RTEMS_CHECK_SC(sc, "create buttons event queue");
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rtems_interrupt_catch(interrupt_handler, MM_IRQ_GPIO, &dummy);
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bsp_interrupt_vector_enable(MM_IRQ_GPIO);
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MM_WRITE(MM_GPIO_INTEN, GPIO_BTN1|GPIO_BTN2|GPIO_BTN3);
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver buttons_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(event_q, &count);
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver buttons_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 < 1) {
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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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event_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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