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Complete the operations described in Getting Started with Hi3861.
LED control examples are stored in the file applications/sample/wifi-iot/app/iothardware/led_example.c.
Understand the cable connections by referring to the schematic diagram. The LED is connected to the function multiplexing pin WIFI_IOT_IO_NAME_GPIO_9.
NOTE: For details about the schematic diagram of the development board, contact the Hi3861 customer service personnel.
Initialize the GPIO pin, specify the pin usage, and create a task to turn on or off the LED periodically so that the LED blinks.
static void LedExampleEntry(void)
{
osThreadAttr_t attr;
/* Initialize the GPIO pin. */
GpioInit();
/* Configure GPIO pin 9. */
IoSetFunc(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_IO_FUNC_GPIO_9_GPIO);
/* Set pin 9 as the output direction. */
GpioSetDir(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_GPIO_DIR_OUT);
attr.name = "LedTask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = LED_TASK_STACK_SIZE;
attr.priority = LED_TASK_PRIO;
/* Start the task. */
if (osThreadNew((osThreadFunc_t)LedTask, NULL, &attr) == NULL) {
printf("[LedExample] Falied to create LedTask!\n");
}
}
Use a cyclic task in which the LED periodically turns on and off to implement LED blinking.
static void *LedTask(const char *arg)
{
(void)arg;
while (1) {
switch (g_ledState) {
case LED_ON:
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, 1);
usleep(LED_INTERVAL_TIME_US);
break;
case LED_OFF:
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, 0);
usleep(LED_INTERVAL_TIME_US);
break;
case LED_SPARK:
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, 0);
usleep(LED_INTERVAL_TIME_US);
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_9, 1);
usleep(LED_INTERVAL_TIME_US);
break;
default:
usleep(LED_INTERVAL_TIME_US);
break;
}
}
return NULL;
}
Call SYS_RUN() of OpenHarmony to start the service. (SYS_RUN is defined in the ohos_init.h file.)
SYS_RUN(LedExampleEntry);
Change the applications/sample/wifi-iot/app/BUILD.gn file to enable led_example.c to participate in compilation.
import("//build/lite/config/component/lite_component.gni")
lite_component("app") {
features = [
"iothardware:led_example"
]
}
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