Looks like working lab03.2 code

Makefile

@@ -8,7 +8,6 @@ CC = avr-gcc
 OBJCOPY = avr-objcopy
 AVRDUDE = avrdude
 CODE_FORMATTER = tooling/format-code.sh
-AVRSIZE = avr-size
 
 BOARD = atmega2560
 
@@ -43,19 +42,13 @@ CFLAGS =	-Wall \
 			-Werror \
 			-Wfatal-errors \
 			-Os \
-			-flto \
-			-fdata-sections \
-			-ffunction-sections \
 			-mmcu=$(BOARD) \
 			-DF_CPU=16000000UL \
 			-DGIT_DESCR=\"$(shell git describe --abbrev=6 --dirty --always --tags --long)\" \
-			-ffreestanding \
 			-std=c11
 
 # Linker flags
-LDFLAGS =	-mmcu=$(BOARD) \
-			-flto \
-			-Wl,-gc-sections
+LDFLAGS = -mmcu=$(BOARD)
 
 OBJCOPYARGS =	-O ihex \
 				-R .eeprom
@@ -69,9 +62,6 @@ AVRDUDEARGS =	-p $(BOARD) \
 				-V \
 				-D
 
-AVRSIZEARGS =	-C \
-				--mcu=$(BOARD)
-
 all: $(ELF) $(TARGET)
 
 %.o : %.c
@@ -93,9 +83,6 @@ install:
 	$(AVRDUDE) $(AVRDUDEARGS) -U flash:w:$(TARGET)
 
 format:
-	$(CODE_FORMATTER) $(SRCDIR)/*.c
+	$(CODE_FORMATTER) $(SRC)
 
-size:
-	$(AVRSIZE) $(AVRSIZEARGS) $(ELF)
-
-.PHONY: clean install format size
+.PHONY: clean install format

README.md

@@ -0,0 +1,41 @@
+# I237 Hardware Programming
+
+This here is my repository for hardware programming course at
+Estonian IT College that is based around a
+[Arduino Mega 2560](https://www.arduino.cc/en/Main/ArduinoBoardMega2560).
+
+This code us usualy updated once every two weeks when a new excersice is put up
+by Silver Kits.
+
+# How to install
+
+Currently to test this code you have to clone the repository
+
+```bash
+git clone https://git.wut.ee/arti/i237.git hardware
+cd hardware
+```
+
+And export a enviroment variable that points to a Arduino Mega board. The
+real path will depend on the OS and Computer that you are using. For me it is
+usualy `/dev/ttyACM0`.
+
+```bash
+export ARDUINO=/dev/ttyACM0
+```
+
+After that you can `make` the project.
+
+```bash
+make clean
+make
+make install
+```
+
+You can also chekcout previous labs using `git checkout <lab name>`. For example
+
+```bash
+git checkout lab02
+```
+
+Don't forget to `make clean` after each checkout!

src/hmi_msg.h

@@ -1,26 +1,18 @@
+#include <avr/pgmspace.h>
 #ifndef _HMI_MSG_H_
 #define _HMI_MSG_H_
 
-#define VER_FW "Version: %S built on: %S %S\n"
-#define VER_LIBC "avr-libc version: %S\n"
-#define UI_GET_MONTH_LETTER "Enter Month name first letter >"
-
-#define STUD_NAME "Arti Zirk"
-const char string_1[] PROGMEM = "January";
-const char string_2[] PROGMEM = "February";
-const char string_3[] PROGMEM = "March";
-const char string_4[] PROGMEM = "April";
-const char string_5[] PROGMEM = "May";
-const char string_6[] PROGMEM = "June";
-
-PGM_P const months_table[] PROGMEM = 
-{
-    string_1,
-    string_2,
-    string_3,
-    string_4,
-    string_5,
-    string_6
-};
+const char PROG_VERSION[]  PROGMEM = "Version: %s built on: %s %s\n";
+const char LIBC_VERSION[]  PROGMEM = "avr-libc version: %s\n";
+const char STUD_NAME[]     PROGMEM = "Arti Zirk";
+const char GET_MONTH_MSG[] PROGMEM = "Enter Month name first letter >";
+const char ENG_MONTH[6][9] PROGMEM = {
+                                        "January",
+                                        "February",
+                                        "March",
+                                        "April",
+                                        "May",
+                                        "June",
+                                      };
 
 #endif /* _HMI_MSG_H_ */

src/main.c

@@ -1,8 +1,8 @@
 #include <stdio.h>
 #include <string.h>
 #include <avr/io.h>
-#include <util/delay.h>
 #include <avr/pgmspace.h>
+#include <util/delay.h>
 #include "hmi_msg.h"
 #include "uart.h"
 #include "print_helper.h"
@@ -12,53 +12,56 @@
 
 int main (void)
 {
-    /* set pin 3 of PORTA for output*/
+    /* Init */
     DDRA |= _BV(DDA3);
-    /* Init stdio on UART0 and UART3 and print user code info */
     uart0_init();
     uart3_init();
-    lcd_init();
-    lcd_clrscr();
     stdout = stdin = &uart0_io;
     stderr = &uart3_out;
-    fprintf_P(stderr, PSTR(VER_FW),
-              PSTR(GIT_DESCR), PSTR(__DATE__), PSTR(__TIME__));
-    fprintf_P(stderr, PSTR(VER_LIBC), PSTR(__AVR_LIBC_VERSION_STRING__));
-    /* End stdio init and info print */
-    fprintf_P(stdout, PSTR(STUD_NAME "\n"));
-    lcd_puts_P(PSTR(STUD_NAME));
+    lcd_init();
+    lcd_clrscr();
+    /* End init */
+
+    /* Print version info to stderr */
+    fprintf_P(stderr, PROG_VERSION, GIT_DESCR, __DATE__, __TIME__);
+    fprintf_P(stderr, LIBC_VERSION, __AVR_LIBC_VERSION_STRING__);
+    /* End version print */
+
+    fprintf_P(stdout, STUD_NAME);
+    fputc('\n', stdout); /* Add a new line to the uart printout */
+    lcd_puts_P(STUD_NAME);
+    lcd_goto(0x40); /* Got to the beginning of the next line */
+
     /* ASCII table print */
     print_ascii_tbl(stdout);
     unsigned char ascii[128] = {0};
-
     for (unsigned char i = 0; i < sizeof(ascii); i++) {
         ascii[i] = i;
     }
-
     print_for_human(stdout, ascii, sizeof(ascii));
 
     while (1) {
-        char month_first_leter;
-        fprintf_P(stdout, PSTR(UI_GET_MONTH_LETTER));
-        fscanf(stdin, "%c", &month_first_leter);
-        fprintf(stdout, "%c\n", month_first_leter);
-        lcd_goto(0x40);
-
-        for (int i = 0; i < 6; i++) {
-            if (!strncmp_P(&month_first_leter, (PGM_P)pgm_read_word(&months_table[i]), 1)) {
-                fprintf_P(stdout, PSTR("%S\n"), (PGM_P)pgm_read_word(&months_table[i]));
-                lcd_puts_P((PGM_P)pgm_read_word(&months_table[i]));
-                lcd_putc(' ');
-            }
-        }
-
-        for (int i = 0; i < 16; i++) {
-            lcd_putc(' ');
-        }
-
         /* set pin 3 high to turn led on */
         PORTA |= _BV(PORTA3);
         _delay_ms(BLINK_DELAY_MS);
+
+        /* Month search and print */
+        char month_first_leter;
+        fprintf_P(stdout, GET_MONTH_MSG);
+        fscanf(stdin, "%c", &month_first_leter);
+        fprintf(stdout, "%c\n", month_first_leter);
+        for (int i = 0; i < 6; i++) {
+            if (!strncmp_P(&month_first_leter, ENG_MONTH[i], 1)) {
+                fprintf_P(stdout, ENG_MONTH[i]);
+                fputc('\n', stdout);
+                lcd_puts_P(ENG_MONTH[i]);
+                lcd_putc(' ');
+            }
+        }
+        lcd_puts_P(PSTR("                ")); /* Clear the end of the line */
+        lcd_goto(0x40); /* Got to the beginning of the next line */
+
+
         /* set pin 3 low to turn led off */
         PORTA &= ~_BV(PORTA3);
         _delay_ms(BLINK_DELAY_MS);

src/print_helper.c

@@ -1,31 +1,27 @@
 #include <stdio.h>
 #include "print_helper.h"
 
-int print_ascii_tbl (FILE *stream)
-{
+int print_ascii_tbl (FILE *stream) {
     for (char c = ' '; c <= '~'; c++) {
-        if (!fprintf(stream, "%c ", c)) {
+        if(!fprintf(stream, "%c ", c)) {
             return 0;
         }
     }
-
     return fprintf(stream, "\n");
 }
 
 
-int print_for_human (FILE *stream, const unsigned char *array, const int len)
-{
+int print_for_human (FILE *stream, const unsigned char *array, const int len) {
     for (int i = 0; i < len; i++) {
         if (array[i] >= ' ' && array[i] <= '~') {
-            if (!fprintf(stream, "%c", array[i])) {
+            if(!fprintf(stream, "%c", array[i])) {
                 return 0;
             }
         } else {
-            if (!fprintf(stream, "\"0x%02x\"", array[i])) {
+            if(!fprintf(stream, "\"0x%02x\"", array[i])) {
                 return 0;
             }
         }
     }
-
     return fprintf(stream, "\n");;
 }