TI中文支持网Part Number:TM4C123GH6PM
if(xQueueReceive(g_pLEDQueue, &i8Message, 0) == pdPASS)
{
//
// If left button, update to next LED.
//
if(i8Message == LEFT_BUTTON)
{
//
// Update the LED buffer to turn off the currently working.
//
g_pui32Colors[g_ui8ColorsIndx] = 0x0000;
//
// Update the index to next LED
g_ui8ColorsIndx++;
if(g_ui8ColorsIndx > 2)
{
g_ui8ColorsIndx = 0;
}
//
// Update the LED buffer to turn on the newly selected LED.
//
g_pui32Colors[g_ui8ColorsIndx] = 0x8000;
//
// Configure the new LED settings.
//
RGBColorSet(g_pui32Colors);
//
// Guard UART from concurrent access. Print the currently
// blinking LED.
//
xSemaphoreTake(g_pUARTSemaphore, portMAX_DELAY);
UARTprintf("Led %d is blinking. [R, G, B]\n", g_ui8ColorsIndx);
xSemaphoreGive(g_pUARTSemaphore);
}
//
// If right button, update delay time between toggles of led.
//
if(i8Message == RIGHT_BUTTON)
{
ui32LEDToggleDelay *= 2;
if(ui32LEDToggleDelay > 1000)
{
ui32LEDToggleDelay = LED_TOGGLE_DELAY / 2;
}
//
// Guard UART from concurrent access. Print the currently
// blinking frequency.
//
xSemaphoreTake(g_pUARTSemaphore, portMAX_DELAY);
UARTprintf("Led blinking frequency is %d ms.\n",
(ui32LEDToggleDelay * 2));
xSemaphoreGive(g_pUARTSemaphore);
}
}
//
// Turn on the LED.
//
RGBEnable();
//
// Wait for the required amount of time.
//
vTaskDelayUntil(&ui32WakeTime, ui32LEDToggleDelay / portTICK_RATE_MS);
//
// Turn off the LED.
//
RGBDisable();
//
// Wait for the required amount of time.
//
vTaskDelayUntil(&ui32WakeTime, ui32LEDToggleDelay / portTICK_RATE_MS);
}
}
这是上面freertos demo里的例程的led.c,看不懂，帮帮我吧，谢谢朋友们
Susan Yang：
能否详细说明一下您的疑惑？
,
fengtuotuo feng：
好的，就是
if(i8Message == LEFT_BUTTON) { // // Update the LED buffer to turn off the currently working. // g_pui32Colors[g_ui8ColorsIndx] = 0x0000;
// // Update the index to next LED g_ui8ColorsIndx++; if(g_ui8ColorsIndx > 2) { g_ui8ColorsIndx = 0; }
,
fengtuotuo feng：
里面的0x0000比如这个在哪来的数据，代表什么含义呢
,
Susan Yang：
若是可以的话，请给出您下载例程的链接。单从代码来看，g_ui8ColorsIndx代表的是LED buffer，以给该buffer赋值来决定LED的状态，类似引脚的寄存器，当赋值为0时，代表led灭掉
