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// non blocking delay example
Delay_TypeDef d1, d2, usart1_d1;

char buffer[USART1_BUFFER_SIZE] = {0};

if (DWT_nb_timeout(&d1)) {
	GPIO_WritePin(GPIOB, 12 , state1); state1 = !state1;
	DWT_nb_delay_ms(&d1, 300);
}

if (DWT_nb_timeout(&d2)) {
	GPIO_WritePin(GPIOB, 14 , state2); state2 = !state2;
	DWT_nb_delay_ms(&d2, 700);
}

// non blocking delay, USART1
if (DWT_nb_timeout(&usart1_d1)) {
	if (USART1_ReadString(buffer))
		USART1_SendString(buffer);
	DWT_nb_delay_ms(&usart1_d1, 50);
}