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- void __irq_usart3(void) {
- digitalWrite(33,HIGH);
- delay(20);
- digitalWrite(33,LOW);
- }
- void setup()
- {
- pinMode(33,OUTPUT);
- USART3->regs->BRR = 0x120; // Baud Rate Register
- USART3->regs->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
- USART3->regs->CR1 |= USART_CR1_UE;
- USART3->regs->CR2 = 0b0010000000100000; // CR 2
- USART3->regs->CR3 = 0x0000; // CR 3
- nvic_irq_enable(NVIC_USART3);
- rcc_clk_enable(RCC_USART3);
- }
- void loop()
- {
- digitalWrite(33,HIGH);
- delay(200);
- digitalWrite(33,LOW);
- delay(1000);
- }
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