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usart.h
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1 /* This program is free software: you can redistribute it and/or modify
2  * it under the terms of the GNU General Public License as published by
3  * the Free Software Foundation, either version 3 of the License, or
4  * (at your option) any later version.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9  * GNU General Public License for more details.
10  *
11  * You should have received a copy of the GNU General Public License
12  * along with this program. If not, see <http://www.gnu.org/licenses/>.
13  *
14  */
21 #pragma once
22 
24 #define USART_BUFFER 128
25 
26 extern volatile uint8_t usart_received;
27 
29 void usart_setup(void);
33 void usart_putchar_blocking(char c);
37 void usart_flush(void);
42 char usart_getchar(void);
47 void usart_putchar_nonblocking(char c);
void usart_setup(void)
setup USART peripheral
Definition: usart.c:60
volatile uint8_t usart_received
how many bytes available in the received buffer since last read
Definition: usart.c:58
void usart_flush(void)
ensure all data has been transmitted (blocking)
Definition: usart.c:95
void usart_putchar_nonblocking(char c)
send character over USART (non-blocking)
Definition: usart.c:117
void usart_putchar_blocking(char c)
send character over USART (blocking)
Definition: usart.c:89
char usart_getchar(void)
get character received over USART (blocking)
Definition: usart.c:103