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62 lines
1.1 KiB
62 lines
1.1 KiB
/** @file usart1.h
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@author Michael Hayes
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@date 10 December 2004
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@brief Routines for interfacing with the usart1 on an Atmega32u2
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*/
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#ifndef USART1_H
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#define USART1_H
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#include "system.h"
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typedef struct usart1_cfg_struct
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{
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uint16_t baud_divisor;
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uint8_t bits;
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} usart1_cfg_t;
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#define USART1_BAUD_DIVISOR(BAUD_RATE) ((F_CPU / 16) / (BAUD_RATE))
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/** Return non-zero if there is a character ready to be read. */
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bool
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usart1_read_ready_p (void);
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/** Read character from USART1. This blocks if nothing is available to
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read. */
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int8_t
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usart1_getc (void);
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/** Return non-zero if a character can be written without blocking. */
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bool
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usart1_write_ready_p (void);
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/** Return non-zero if transmission finished. This is useful for
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half-duplex operation. */
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bool
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usart1_write_finished_p (void);
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/** Write character to USART1. This blocks until the character can be
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written into the transmit register. */
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void
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usart1_putc (char ch);
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/** Write string to USART1. */
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void
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usart1_puts (const char *str);
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/** Initialise usart1 and set baud rate. */
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uint8_t
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usart1_init (const usart1_cfg_t *cfg);
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#endif
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