Proteus8.0仿真应用设计（二十六）基于FreeRTOS、STM32F103C8、HAL库、4x4矩阵键盘应用设计仿真

一、仿真原理图：

二、部分代码：

        按键采集

uint8_t KeyScan(void)  
{
	uint8_t value = 0x00;

	KeyPort->ODR = 0x00;

	KeyPort->ODR = 0xf7;

	if((KeyPort->IDR & 0xf0) != 0xf0)
	{
		HAL_Delay(50);

		if((KeyPort->IDR & 0xf0) != 0xf0)
		{
			value = (KeyPort->IDR & 0xf7);
		}
	}
	
	KeyPort->ODR = 0x00;

	KeyPort->ODR = 0xfb;

	if((KeyPort->IDR & 0xf0) != 0xf0)
	{
		HAL_Delay(50);

		if((KeyPort->IDR & 0xf0) != 0xf0)
		{
			value = (KeyPort->IDR & 0xfb);
		}
	}
	
	KeyPort->ODR = 0x00;

	KeyPort->ODR = 0xfd;

	if((KeyPort->IDR & 0xf0) != 0xf0)
	{
		HAL_Delay(50);

		if((KeyPort->IDR & 0xf0) != 0xf0)
		{
			value = (KeyPort->IDR & 0xfd);
		}
	}
	
	KeyPort->ODR = 0x00;