85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
#include <stddef.h>
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#include <signal.h>
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#include <string.h>
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#include <pthread.h>
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#include "scode.h"
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#include "log.h"
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#include "msg_queue.h"
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#include "gpio.h"
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#include "time_func.h"
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#define DEBOUNCE_BUTTON_MSEC 100
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PMSG_QUEUE Sys_Queue = NULL;
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static pthread_t ithread;
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static volatile sig_atomic_t running = 1;
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static UINT32 last_bstate = 0;
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static void *input_thread(void *arg)
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{
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UINT32 st, down, up, mask;
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UINT_PTR attr;
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TIMESTAMP now;
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TIMESTAMP button_event_ok[GPIO_BUTTON_COUNT];
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memset(button_event_ok, 0, GPIO_BUTTON_COUNT * sizeof(TIMESTAMP));
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while (running)
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{
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/* poll hardware buttons */
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st = Gpio_read_buttons();
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if (st != last_bstate)
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{
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now = Time_since_start();
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up = last_bstate & ~st;
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down = st & ~last_bstate;
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for (attr = 1, mask = GRB_STATE_BUTTON1; attr <= GPIO_BUTTON_COUNT; attr++, mask <<= 1)
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{
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if (now < button_event_ok[attr - 1])
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continue;
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if (up & mask)
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{
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button_event_ok[attr - 1] = now + DEBOUNCE_BUTTON_MSEC;
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Mq_post1(Sys_Queue, 0, WM_HWBUTTONUP, attr);
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}
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else if (down & mask)
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Mq_post1(Sys_Queue, 0, WM_HWBUTTONDOWN, attr);
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}
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last_bstate = st;
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}
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/* additional poll activity here */
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}
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return NULL;
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}
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HRESULT Sys_enable_input(void)
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{
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HRESULT rc = S_OK;
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int threadrc;
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Sys_Queue = Mq_alloc(64);
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if (!Sys_Queue)
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{
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Log(LFATAL, "Unable to allocate system message queue.");
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return E_OUTOFMEMORY;
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}
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running = 1;
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threadrc = pthread_create(&ithread, NULL, input_thread, NULL);
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if (threadrc != 0)
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{
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rc = SCODE_FROM_ERRNO(threadrc);
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Log(LFATAL, "Unable to start system input thread (%08X).", rc);
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}
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return rc;
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}
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void Sys_disable_input(void)
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{
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running = 0;
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pthread_join(ithread, NULL);
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Mq_destroy(Sys_Queue);
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Sys_Queue = NULL;
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}
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