bbb_cape/src/cape/uart_byte.h

#ifndef CAPE_UART_BYTE_H_
#define CAPE_UART_BYTE_H_

#include <stdint.h>

// uart_common_configure must be called before this.
void uart_byte_configure(void);

// Spins until 1 byte is received or some amount of time. The timeout is
// timeout_count*(timeout_divider+1)/30MHz.
// The result is <0 for timeout or the received byte.
int uart_byte_receive(uint16_t timeout_count, uint16_t timeout_divider);

// Spins until 1 byte can be written out.
void uart_byte_send(uint8_t value);

#endif  // CAPE_UART_BYTE_H_