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Async uart

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This commit is contained in:
Arti Zirk 2016-11-07 01:42:18 +02:00
parent 6635f07e8d
commit 22461eaff4
5 changed files with 113 additions and 122 deletions
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98
src/main.c
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@ -1,38 +1,57 @@
#include <stdio.h>
#include <string.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "hmi_msg.h"
#include "uart.h"
#include "../lib/andygock_avr-uart/uart.h"
#include "uart_wrap.h"
#include "print_helper.h"
#include "../lib/hd44780_111/hd44780.h"
#define BAUDRATE 9600
#define BLINK_DELAY_MS 100
int main (void)
// For configuring arduino mega pin 25
#define LED_INIT DDRA |= _BV(DDA3);
#define LED_ON PORTA |= _BV(PORTA3)
#define LED_OFF PORTA &= ~_BV(PORTA3)
#define LED_DELAY _delay_ms(BLINK_DELAY_MS)
static inline void init_hw (void)
{
/* Init */
DDRA |= _BV(DDA3);
uart0_init();
uart3_init();
// IO init
/// Set arduino pin 25 as output
LED_INIT;
// UART init
uart0_init(UART_BAUD_SELECT(BAUDRATE, F_CPU));
uart3_init(UART_BAUD_SELECT(BAUDRATE, F_CPU));
stdout = stdin = &uart0_io;
stderr = &uart3_out;
// LCD init
lcd_init();
lcd_clrscr();
/* End init */
/* Print version info to stderr */
// Enable interupts
sei();
}
static inline void start_ui (void)
{
// Print program and libc versions
fprintf_P(stderr, PSTR(PROG_VERSION),
PSTR(GIT_DESCR), PSTR(__DATE__), PSTR(__TIME__));
fprintf_P(stderr, PSTR(LIBC_VERSION), PSTR(__AVR_LIBC_VERSION_STRING__));
/* End version print */
// print student name
fprintf_P(stdout, PSTR(STUD_NAME));
fputc('\n', stdout); /* Add a new line to the uart printout */
fputc('\n', stdout); // Add a new line to the uart printout
lcd_puts_P(PSTR(STUD_NAME));
/* ASCII table print */
// ASCII table print
print_ascii_tbl(stdout);
unsigned char ascii[128];
for (unsigned char i = 0; i < sizeof(ascii); i++) {
@ -40,30 +59,43 @@ int main (void)
}
print_for_human(stdout, ascii, sizeof(ascii));
while (1) {
/* set pin 3 high to turn led on */
PORTA |= _BV(PORTA3);
_delay_ms(BLINK_DELAY_MS);
fprintf_P(stdout, PSTR(GET_MONTH_MSG));
}
/* Month search and print */
char letter;
fprintf_P(stdout, PSTR(GET_MONTH_MSG));
fscanf(stdin, "%c", &letter);
fprintf(stdout, "%c\n", letter);
lcd_goto(0x40); /* Got to the beginning of the next line */
for (int i = 0; i < 6; i++) {
if (!strncmp_P(&letter, (PGM_P)pgm_read_word(&months[i]), 1)) {
fprintf_P(stdout, (PGM_P)pgm_read_word(&months[i]));
fputc('\n', stdout);
lcd_puts_P((PGM_P)pgm_read_word(&months[i]));
lcd_putc(' ');
}
static inline void search_month (void)
{
char letter;
fscanf(stdin, "%c", &letter);
fprintf(stdout, "%c\n", letter);
lcd_goto(0x40); // Got to the beginning of the next line
for (int i = 0; i < 6; i++) {
if (!strncmp_P(&letter, (PGM_P)pgm_read_word(&months[i]), 1)) {
fprintf_P(stdout, (PGM_P)pgm_read_word(&months[i]));
fputc('\n', stdout);
lcd_puts_P((PGM_P)pgm_read_word(&months[i]));
lcd_putc(' ');
}
}
lcd_puts_P(PSTR(" ")); // Clear the end of the line
fprintf_P(stdout, PSTR(GET_MONTH_MSG));
}
int main (void)
{
init_hw();
start_ui();
while (1) {
LED_ON;
LED_DELAY;
if (uart0_available()) {
search_month();
}
lcd_puts_P(PSTR(" ")); /* Clear the end of the line */
/* set pin 3 low to turn led off */
PORTA &= ~_BV(PORTA3);
_delay_ms(BLINK_DELAY_MS);
LED_OFF;
LED_DELAY;
}
}

72
src/uart.c
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@ -1,72 +0,0 @@
#include <avr/io.h>
#include <stdio.h>
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
#ifndef BAUD
#define BAUD 9600
#endif
#include <util/setbaud.h>
/* http://www.cs.mun.ca/~rod/Winter2007/4723/notes/serial/serial.html */
void uart0_init(void)
{
UBRR0H = UBRRH_VALUE;
UBRR0L = UBRRL_VALUE;
#if USE_2X
UCSR0A |= _BV(U2X0);
#else
UCSR0A &= ~(_BV(U2X0));
#endif
UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); /* 8-bit data */
UCSR0B = _BV(RXEN0) | _BV(TXEN0); /* Enable RX and TX */
}
void uart3_init(void)
{
UBRR3H = UBRRH_VALUE;
UBRR3L = UBRRL_VALUE;
#if USE_2X
UCSR3A |= _BV(U2X3);
#else
UCSR3A &= ~(_BV(U2X3));
#endif
UCSR3C = _BV(UCSZ31) | _BV(UCSZ30); /* 8-bit data */
UCSR3B = _BV(TXEN3); /* Enable TX */
}
int uart0_putchar(char c, FILE *stream)
{
(void) stream;
if (c == '\n') {
uart0_putchar('\r', stream);
}
loop_until_bit_is_set(UCSR0A, UDRE0);
UDR0 = c;
return 0;
}
int uart3_putchar(char c, FILE *stream)
{
(void) stream;
if (c == '\n') {
uart3_putchar('\r', stream);
}
loop_until_bit_is_set(UCSR3A, UDRE3);
UDR3 = c;
return 0;
}
int uart0_getchar(FILE *stream)
{
(void) stream;
loop_until_bit_is_set(UCSR0A, RXC0);
return UDR0;
}

17
src/uart.h
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@ -1,17 +0,0 @@
#ifndef _UART_H_
#define _UART_H_
int uart0_putchar(char c, FILE *stream);
int uart0_getchar(FILE *stream);
int uart3_putchar(char c, FILE *stream);
void uart0_init(void);
void uart3_init(void);
/* http://www.ermicro.com/blog/?p=325 */
FILE uart0_io = FDEV_SETUP_STREAM(uart0_putchar, uart0_getchar, _FDEV_SETUP_RW);
FILE uart3_out = FDEV_SETUP_STREAM(uart3_putchar, NULL, _FDEV_SETUP_WRITE);
#endif /* _UART_H_ */

33
src/uart_wrap.c Normal file
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@ -0,0 +1,33 @@
#include <avr/io.h>
#include <stdio.h>
#include "../lib/andygock_avr-uart/uart.h"
int uart0_putc_wrap(char c, FILE *stream)
{
(void) stream;
if (c == '\n') {
uart0_putc_wrap('\r', stream);
}
uart0_putc(c);
return 0;
}
int uart0_getc_wrap(FILE *stream)
{
(void) stream;
return (char)uart0_getc();
}
int uart3_putc_wrap(char c, FILE *stream)
{
(void) stream;
if (c == '\n') {
uart3_putc_wrap('\r', stream);
}
uart3_putc(c);
return 0;
}

15
src/uart_wrap.h Normal file
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@ -0,0 +1,15 @@
#ifndef _UART_H_
#define _UART_H_
int uart0_putc_wrap(char c, FILE *stream);
int uart0_getc_wrap(FILE *stream);
int uart3_putc_wrap(char c, FILE *stream);
/* http://www.ermicro.com/blog/?p=325 */
FILE uart0_io = FDEV_SETUP_STREAM(uart0_putc_wrap, uart0_getc_wrap, _FDEV_SETUP_RW);
FILE uart3_out = FDEV_SETUP_STREAM(uart3_putc_wrap, NULL, _FDEV_SETUP_WRITE);
#endif /* _UART_H_ */