Created
November 20, 2016 08:24
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Example of sam3x8e UART initialization
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| void setupUART() | |
| { | |
| PIO_Configure(PIOA, PIO_PERIPH_A,PIO_PA8A_URXD|PIO_PA9A_UTXD, PIO_DEFAULT); | |
| /* Enable the pull up on the Rx and Tx pin */ | |
| PIOA->PIO_PUER = PIO_PA8A_URXD | PIO_PA9A_UTXD; | |
| /*Включаем UART, подавая на него тактирование*/ | |
| pmc_enable_periph_clk(ID_UART); | |
| /* Отключаем DMA для приёма и для передачи */ | |
| UART->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS; | |
| // Reset and disable receiver and transmitter | |
| UART->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS; | |
| // Configure mode | |
| uint32_t dwMode = US_MR_CHRL_8_BIT | US_MR_NBSTOP_1_BIT | UART_MR_PAR_NO; | |
| uint32_t modeReg = dwMode & 0x00000E00; | |
| UART->UART_MR = modeReg; | |
| // Configure baudrate (asynchronous, no oversampling) | |
| uint32_t dwBaudRate = 9600; | |
| UART->UART_BRGR = (SystemCoreClock / dwBaudRate) >> 4; | |
| /*Конфигурируем прерывания*/ | |
| /*Отключаем их*/ | |
| UART->UART_IDR = 0xFFFFFFFF; | |
| /*Включаем нужные нам прерывания. Если работаем с портом через поллинг, то | |
| включать прерывания не нужно*/ | |
| #ifndef USE_POLLING | |
| UART->UART_IER = UART_IER_RXRDY | UART_IER_OVRE | UART_IER_FRAME; | |
| #endif | |
| NVIC_EnableIRQ(UART_IRQn); | |
| /*Включаем передачу и приём*/ | |
| UART->UART_CR = UART_CR_RXEN | UART_CR_TXEN; | |
| } |
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Give an example of initializing port B, and writing to port