lab04 code ready

src/hmi_msg.h

@@ -6,6 +6,7 @@
 #define LIBC_VERSION "avr-libc version: %S\n"
 #define STUD_NAME "Arti Zirk"
 #define GET_MONTH_MSG "Enter Month name first letter >"
+#define UPTIME "Uptime: %lu s"
 
 const char m1[] PROGMEM = "January";
 const char m2[] PROGMEM = "February";

src/main.c

@@ -2,32 +2,48 @@
 #include <string.h>
 #include <avr/io.h>
 #include <avr/pgmspace.h>
+#include <avr/interrupt.h>
 #include <util/delay.h>
 #include "hmi_msg.h"
-#include "uart.h"
+#include "uart-wrapper.h"
 #include "print_helper.h"
 #include "../lib/hd44780_111/hd44780.h"
+#include "../lib/andygock_avr-uart/uart.h"
 
+#define BAUD 9600
 #define BLINK_DELAY_MS 100
 
-int main (void)
+volatile uint32_t time;
+
+static inline void init_system_clock(void)
 {
-    /* Init */
-    DDRA |= _BV(DDA3);
-    uart0_init();
-    uart3_init();
+    TCCR5A = 0; // Clear control register A
+    TCCR5B = 0; // Clear control register B
+    TCCR5B |= _BV(WGM52) | _BV(CS52); // CTC and fCPU/256
+    OCR5A = 62549; // 1 s
+    TIMSK5 |= _BV(OCIE5A); // Output Compare A Match Interrupt Enable
+}
+
+static inline void hw_init() {
+    DDRA |= _BV(DDA3); // setup Arduino pin 25 as output
+    uart0_init(UART_BAUD_SELECT(BAUD, F_CPU));
+    uart3_init(UART_BAUD_SELECT(BAUD, F_CPU));
+    init_system_clock();
+    sei(); // Enable interupts
     stdout = stdin = &uart0_io;
     stderr = &uart3_out;
     lcd_init();
     lcd_clrscr();
-    /* End init */
+}
 
-    /* Print version info to stderr */
+static inline void print_prog_version() {
     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 */
+}
 
+
+static inline void print_program_startup() {
     fprintf_P(stdout, PSTR(STUD_NAME));
     fputc('\n', stdout); /* Add a new line to the uart printout */
     lcd_puts_P(PSTR(STUD_NAME));
@@ -40,14 +56,13 @@ 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));
+}
 
+
+static inline void search_month() {
     /* 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 */
@@ -59,11 +74,39 @@ int main (void)
             lcd_putc(' ');
         }
     }
-
+    fprintf_P(stdout, PSTR(GET_MONTH_MSG));
     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);
+static inline void heartbeat() {
+    static uint32_t last_time;
+    uint32_t cur_time = time;
+    if ((last_time - cur_time) > 0) {
+        // Toggle led on arduino pin 25
+        PORTA ^= _BV(PORTA3);
+        fprintf_P(stderr, PSTR(UPTIME "\n"), cur_time);
+    }
+    last_time = cur_time;
+}
+
+int main (void)
+{
+
+    hw_init();
+    print_prog_version();
+    print_program_startup();
+
+
+    while (1) {
+        heartbeat();
+        if(uart0_available()) {
+            search_month();
+        }
     }
 }
+
+/* System clock ISR */
+ISR(TIMER5_COMPA_vect)
+{
+    time++;
+}

src/uart-wrapper.c

@@ -0,0 +1,33 @@
+#include <avr/io.h>
+#include <stdio.h>
+#include "../lib/andygock_avr-uart/uart.h"
+
+int uart0_putchar(char c, FILE *stream)
+{
+    (void) stream;
+
+    if (c == '\n') {
+        uart0_putchar('\r', stream);
+    }
+
+    uart0_putc(c);
+    return 0;
+}
+
+int uart3_putchar(char c, FILE *stream)
+{
+    (void) stream;
+
+    if (c == '\n') {
+        uart3_putchar('\r', stream);
+    }
+
+    uart3_putc(c);
+    return 0;
+}
+
+int uart0_getchar(FILE *stream)
+{
+    (void) stream;
+    return (unsigned char)uart0_getc();
+}

src/uart-wrapper.h

@@ -1,13 +1,11 @@
-#ifndef _UART_H_
-#define _UART_H_
+#ifndef _UART_WRAPPER_H_
+#define _UART_WRAPPER_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 */
 

src/uart.c

@@ -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;
-}