File indexing completed on 2025-05-11 08:23:44
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0012 #define RTEMS_STATUS_CHECKS_USE_PRINTK
0013
0014 #include <stdlib.h>
0015 #include <sys/types.h>
0016 #include <rtems.h>
0017 #include <rtems/status-checks.h>
0018 #include <bsp.h>
0019 #include <bsp/irq-generic.h>
0020 #include <rtems/libio.h>
0021 #include "../include/system_conf.h"
0022 #include <bsp/milkymist_ir.h>
0023
0024 #define DEVICE_NAME "/dev/ir"
0025
0026 static rtems_id ir_q;
0027
0028 static rtems_isr interrupt_handler(rtems_vector_number n)
0029 {
0030 unsigned short int msg;
0031
0032 lm32_interrupt_ack(1 << MM_IRQ_IR);
0033 msg = MM_READ(MM_IR_RX);
0034 rtems_message_queue_send(ir_q, &msg, 2);
0035 }
0036
0037 rtems_device_driver ir_initialize(
0038 rtems_device_major_number major,
0039 rtems_device_minor_number minor,
0040 void *arg
0041 )
0042 {
0043 rtems_status_code sc;
0044 rtems_isr_entry dummy;
0045
0046 sc = rtems_io_register_name(DEVICE_NAME, major, 0);
0047 RTEMS_CHECK_SC(sc, "create IR input device");
0048
0049 sc = rtems_message_queue_create(
0050 rtems_build_name('R', 'C', '5', 'Q'),
0051 64,
0052 2,
0053 0,
0054 &ir_q
0055 );
0056 RTEMS_CHECK_SC(sc, "create IR queue");
0057
0058 rtems_interrupt_catch(interrupt_handler, MM_IRQ_IR, &dummy);
0059 bsp_interrupt_vector_enable(MM_IRQ_IR);
0060
0061 return RTEMS_SUCCESSFUL;
0062 }
0063
0064 rtems_device_driver ir_open(
0065 rtems_device_major_number major,
0066 rtems_device_minor_number minor,
0067 void *arg
0068 )
0069 {
0070 uint32_t count;
0071
0072 rtems_message_queue_flush(ir_q, &count);
0073 return RTEMS_SUCCESSFUL;
0074 }
0075
0076 rtems_device_driver ir_read(
0077 rtems_device_major_number major,
0078 rtems_device_minor_number minor,
0079 void *arg
0080 )
0081 {
0082 rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
0083 rtems_status_code sc;
0084
0085 if (rw_args->count < 2) {
0086 rw_args->bytes_moved = 0;
0087 return RTEMS_UNSATISFIED;
0088 }
0089
0090 sc = rtems_message_queue_receive(
0091 ir_q,
0092 rw_args->buffer,
0093 (size_t *)&rw_args->bytes_moved,
0094 RTEMS_WAIT,
0095 RTEMS_NO_TIMEOUT
0096 );
0097
0098 if(sc == RTEMS_SUCCESSFUL)
0099 return RTEMS_SUCCESSFUL;
0100 else {
0101 rw_args->bytes_moved = 0;
0102 return RTEMS_UNSATISFIED;
0103 }
0104 }