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PrinceNai
Joined: 31 Oct 2016
Posts: 554
Location: Montenegro
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| menu structure with 4x20 LCD |
 Posted: Sat Jun 29, 2019 9:57 am |
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With great help from the members of this forum I managed to translate the code found here: https://www.youtube.com/watch?v=PFzNBtnfJ6Y to CCS. I do recommend watching those tutorials, because the author really explains it well. It is a menu structure used with 4x20 LCD. It uses three buttons, up, down and enter to browse the menu. Here is the code:
30.6.2019 added "floating header", where the header of the selected menu group always stays on top. Added some more functions behind menus.
menu_structure.c
| Code: |
//#define FLOATING_HEADER 0 // menu header disappears with browsing
#define FLOATING_HEADER 1 // menu header always stays on top
void strromcpy(char *dest, rom char *source);
void LcdWriteStringRom (int8 x, int8 y, rom int8 *LCD_Data, int8 clear_line);
void show_menu (void);
void browse_menu (void);
void start(void);
void dummy(void);
void ClearMinus (void);
void Blank (void);
void ExitMenu(void);
void DisplaySelectedOption(void);
// functions for menus and sub-menus. Note they all start with 1 and the function for last one is always return up, so it is not needed
void Main1(void);
void Main2(void);
void Main3(void);
//
void Sub101(void);
void Sub102(void);
//
void Sub201(void);
void Sub202(void);
void Sub203(void);
void Sub204(void);
void Sub205(void);
void Sub206(void);
//
int8 ROM_String_Length = 0;
char ROM_String_Copy[21];
#define ROW_LENGTH 20 // uncomment for your display size, TBD for displays other than 4x20
//#define ROW_LENGTH 16
int8 line_cnt_g = 1; // first line on LCD is 1, different than tutorial
int8 from_g = 0; // declare global copies of variables from show_menu to be able to see tham all the time with debugger
int8 till_g = 0;
int8 temp_g = 0; // calculate the span of addresses for the current menu
int8 Intermediate_g = 0;
int8 Position = 0;
int8 Exit = 0;
int8 FloatingHeaderAddress = 0; // this is the address of the first entry of the current menu, i.e. header
// that can be used for a "non disappearing header" style of the menu
// menu options texts
rom char menu_000[] = " [MAIN MENU -0]"; // 0
rom char menu_001[] = " main_001-1"; // 1
rom char menu_002[] = " main_002-2"; // 2
rom char menu_003[] = " main_003-3"; // 3
rom char menu_004[] = " EXIT MENU-4"; // 4
// sub-menu 1 text
rom char menu_100[] = " [SUB-MENU1 -5]"; // 5
rom char menu_101[] = " sub_101-6"; // 6
rom char menu_102[] = " sub_102-7"; // 7
rom char menu_103[] = " SUB-MENU1 EXIT -8"; // 8
// sub-menu 2 text
rom char menu_200[] = " [SUB-MENU2 -9]"; // 9
rom char menu_201[] = " sub_201-10"; // 10
rom char menu_202[] = " sub_202-11"; // 11
rom char menu_203[] = " sub_203-12"; // 12
rom char menu_204[] = " sub_204-13"; // 13
rom char menu_205[] = " sub_205-14"; // 14
rom char menu_206[] = " sub_206-15"; // 15
rom char menu_207[] = " SUB-MENU2 EXIT"; // 16
// ******************** END MENU TEXT *****************************************
static unsigned int8 selected = 1; // indicates selected menu item. Start with 1, because we don't want to pick the header
// every element of the array must have all elements defined in the prototype: text, number of elements, up, down, enter and function (can be null)
MenuEntry Menu[] = { // at least one function must be defined, else it doesn't compile
{menu_000, 5, 0, 0, 0, 0}, // text 0; 5 options, up button menu_000, down button menu_000, enter menu_000, no function attached - non browsable
{menu_001, 5, 1, 2, 6, 0}, // text 1; 5 options, up button menu_001, down button menu_002, enter sub-menu_101, no function attached
{menu_002, 5, 1, 3, 10, 0}, // text 2; 5 options, up button menu_001, down button menu_003, enter sub-menu_201, no function attached
{menu_003, 5, 2, 4, 3, 0}, // text 3; 5 options, up button menu_002, down button menu_004, enter menu_003, no function attached
{menu_004, 5, 3, 4, 4, ExitMenu}, // text 4; 5 options, up button menu_003, down button menu_004 {no roll-over}, enter menu_004, execute ExitMenu function
// sub-menu for menu_001
{menu_100, 4, 0, 0, 0, 0}, // text 5; 4 options, non browsable
{menu_101, 4, 6, 7, 6, dummy}, // text 6; 4 options, up button stay in menu_101, down button menu_102, enter menu_101, execute dummy function
{menu_102, 4, 6, 8, 7, Sub102}, // text 7; 4 options, up button menu_101, down button menu_103, enter menu_102, no function attached
{menu_103, 4, 7, 8, 1, Blank}, // text 8; 4 options, up button menu_102, down button stay in menu_103, enter menu_001, execute blank function
// sub-menu for menu_002
{menu_200, 8, 0, 0, 0, 0}, // text 9; main menu, non-browsable
{menu_201, 8, 10, 11, 10, Sub201}, // text 10; main menu, 8 options, up button menu_201, down button menu_202, enter menu_201, no function attached
{menu_202, 8, 10, 12, 11, Sub202}, // text 11; main menu, 8 options, up button menu_201, down button menu_203, enter menu_202, no function attached
{menu_203, 8, 11, 13, 12, Sub203}, // text 12; main menu, 8 options, up button menu_202, down button menu_204, enter menu_203, no function attached
{menu_204, 8, 12, 14, 13, Sub204}, // text 13; main menu, 8 options, up button menu_203, down button menu_205, enter menu_204, no function attached
{menu_205, 8, 13, 15, 14, Sub205}, // text 14; main menu, 8 options, up button menu_204, down button menu_206, enter menu_205, no function attached
{menu_206, 8, 14, 16, 15, Sub206}, // text 15; main menu, 8 options, up button menu_205, down button menu_207, enter menu_206, no function attached
{menu_207, 8, 15, 16, 2, 0} // text 16; main menu, 8 options, up button menu_206, down button menu_207, enter menu_002, no function attached
};
// ********************* END MENU DEFINITIONS ********************************
// ****************************************************************************
// functions
// ******************* COPY STRING FROM ROM TO RAM ****************************
void strromcpy(char *dest, rom char *source)
{
while (*source != '\0')
*(dest++) = *(source++);
*dest='\0';
}
// ****************** WRITE A STRING ON LCD FROM ROM **************************
void LcdWriteStringRom (int8 x, int8 y, rom int8 *LCD_Data, int8 clear_line){
int i = 0;
lcd_gotoxy(x,y);
strromcpy(ROM_String_Copy, LCD_Data); // copy string from ROM to RAM
printf(lcd_putc, "%s", ROM_String_Copy); // display on LCD (assumes 20 characters)
if(clear_line){
ROM_String_Length = strlen(ROM_String_Copy) + x; // get the length of the string, add the offset at the beginning. Otherwise you go over the length of a row
ROM_String_Length = ROW_LENGTH - ROM_String_Length;// calculate how many are missing till the end of the row of 20 characters
while(i <= ROM_String_Length){ // if clear line is 1, fill the line with blanks
lcd_putc(" ");
i++;
}
}
}
// ******************** SHOW THE MENU ON THE LCD ******************************
/* This function formats the menu. It uses fixed third row for the selected option.
Because of this we split the formatting in three parts:
-top of the menu - selected item can be also on first or second row TOP + 2 spaces
-middle of the menu - selected item is in the third row
-bottom of the menu - selected item can sink to the fourth row
*/
void show_menu (void){
if(selected > 13){
delay_cycles(1);
}
int8 line_cnt = 1; // first line on LCD is 1, different than tutorial made with hi-tech that uses 0,0
int8 from = 0;
int8 till = 0;
int8 temp = 0;
int8 Intermediate = 0;
// here we use num_menupoints defined in our struct to calculate how many options
// are available in the current menu and with that where in the menu we are with
// the selected option: top, middle or bottom
while(till <= selected){
till = till + Menu[till].num_menupoints;
// till += Menu[till].num_menupoints; // calculate end position of the current menu
}
from = till - Menu[selected].num_menupoints;
till--; // subtract 1 because numbering starts with 0
till_g = till;
temp = from;
temp_g = temp;
from_g = from;
FloatingHeaderAddress = from; // this is the address of the first entry of the current menu, i.e. header
// that can be used for a "non disappearing header" style of the menu
// we are in the middle of menu
if ((selected >= (from + 2)) && (selected <= ( till - 1))){ // my selection >= top+2 and < till - 1
from = selected - 2 ;
till = from + 3;
till_g = till;
from = from + FLOATING_HEADER;
from_g = from;
Position = 2;
// floating menu style
if(FLOATING_HEADER){
LcdWriteStringRom (2, line_cnt, Menu[FloatingHeaderAddress].text, 1); // write first row, header
line_cnt++;
line_cnt_g = line_cnt;
}
for(from; from <= till; from ++){
LcdWriteStringRom (2, line_cnt, Menu[from].text, 1); // first column is just for indicator!!!
line_cnt++;
line_cnt_g = line_cnt;
}
ClearMinus ();
lcd_gotoxy(1,3); // mark selected menu item
lcd_putc ("-");
} // if brace
// we are within top + 2 spaces
else
{
if(selected < (from + 2)){
Position = 1;
till = from + 3;
till_g = till;
from = from + FLOATING_HEADER;
from_g = from;
// floating menu style
if(FLOATING_HEADER){
LcdWriteStringRom (2, line_cnt, Menu[FloatingHeaderAddress].text, 1); // write first row, header
line_cnt++;
line_cnt_g = line_cnt;
}
for(from; from <= till; from ++){
LcdWriteStringRom (2, line_cnt, Menu[from].text, 1); // first column is just for indicator!!!
line_cnt++;
}
ClearMinus();
Intermediate = (selected - temp + 1); // not really needed, can be direct in lcd function
Intermediate_g = Intermediate;
lcd_gotoxy(1, Intermediate); // mark selected menu item
lcd_putc ("-");
} // if
// bottom of the menu
if(selected == till){ // if the last item on the menu is selected it will be on the fourth row
from = till - 3 + FLOATING_HEADER; // and on LCD we need last string and another three above it
from_g = from;
Position = 3;
// floating menu style
if(FLOATING_HEADER){
LcdWriteStringRom (2, line_cnt, Menu[FloatingHeaderAddress].text, 1); // write first row, header
line_cnt++;
line_cnt_g = line_cnt;
}
for(from; from <= till; from ++)
{ LcdWriteStringRom (2, line_cnt, Menu[from].text, 1); // first column stays empty for indicator
line_cnt++;
}
ClearMinus ();
lcd_gotoxy(1,4);
lcd_putc("-");
} // if
} // else
} // function
// ****************************************************************************
void browse_menu (void){
do{
Exit = 0;
show_menu();
// de-bounce is done in interrupt routine
if(UP_switch_is_down == 1){
UP_switch_is_down = 0;
selected = Menu[selected].up;
}
if(DOWN_switch_is_down == 1){
DOWN_switch_is_down = 0;
selected = Menu[selected].down;
}
if(ENTER_switch_is_down == 1){
ENTER_switch_is_down = 0;
if(Menu[selected].fp != 0){
// Menu[selected].fp(); // original, not working
*Menu[selected].fp(); // added by PCM Programmer
}
if(!Exit){
selected = Menu[selected].enter;
}
else{
selected = 1; // make sure the entry point to the menu is always 1
}
}
}
while(!Exit); // you need some kind of stop condition to exit menus
} // function
// ****************************************************************************
void start(void){
}
// ****************************************************************************
void dummy(void)
{
lcd_putc('\f');
// printf("Hello World\n\r");
lcd_putc("Working, press ENTER");
while(!ENTER_switch_is_down); // stay here until enter key is hit
ENTER_switch_is_down = 0;
lcd_putc('\f');
}
// ****************************************************************************
void ClearMinus (void){
int8 i = 1;
for (i = 1; i < 5; i++){
lcd_gotoxy(1,i); // mark selected menu item
lcd_putc (" ");
}
}
// ****************************************************************************
void Blank (void){
return;
}
// ****************************************************************************
void ExitMenu(void){
lcd_putc('\f');
Exit = 1; // signal to exit menu
}
// functions for menus and sub-menus. Note they all start with 1 and the function for last one is always return up, so it is not needed
void Main1(void){
lcd_putc('\f');
printf("Working, press ENTER");
while(!ENTER_switch_is_down); // stay here until enter key is hit
ENTER_switch_is_down = 0;
lcd_putc('\f');
}
void Main2(void){
lcd_putc('\f');
lcd_putc("Working, press ENTER");
while(!ENTER_switch_is_down); // stay here until enter key is hit
ENTER_switch_is_down = 0;
lcd_putc('\f');
}
void Main3(void){
lcd_putc('\f');
lcd_putc("Working, press ENTER");
while(!ENTER_switch_is_down); // stay here until enter key is hit
ENTER_switch_is_down = 0;
lcd_putc('\f');
}
//
void Sub101(void){
lcd_putc('\f');
lcd_putc("Working, press ENTER");
while(!ENTER_switch_is_down); // stay here until enter key is hit
ENTER_switch_is_down = 0;
lcd_putc('\f');
}
void Sub102(void){
DisplaySelectedOption(); // display which menu option was selected
}
//
void Sub201(void){
DisplaySelectedOption(); // display which menu option was selected
}
void Sub202(void){
DisplaySelectedOption(); // display which menu option was selected
}
void Sub203(void){
DisplaySelectedOption(); // display which menu option was selected
}
void Sub204(void){
DisplaySelectedOption(); // display which menu option was selected
}
void Sub205(void){
DisplaySelectedOption(); // display which menu option was selected
}
void Sub206(void){
DisplaySelectedOption(); // display which menu option was selected
}
void DisplaySelectedOption(void){
lcd_putc('\f');
printf(lcd_putc, "Selected menu = %u", selected);
while(!ENTER_switch_is_down); // stay here until enter key is hit
ENTER_switch_is_down = 0;
lcd_putc('\f');
}
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menu_structure.h
| Code: |
typedef void(*_fptr)(void); // added by PCM Programmer
typedef rom struct MenuStructure{
rom char *text;
unsigned char num_menupoints;
unsigned char up;
unsigned char down;
unsigned char enter;
// void (*fp)(void); // original, not working
_fptr fp; // added by PCM Programmer
}
MenuEntry;
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and a sample project:
menu.c
| Code: |
#include <menu.h>
#include <string.h>
#include <i2c_Flex_LCD_driver.c> //LCD driver
#define UP_switch PIN_A3
#define DOWN_switch PIN_A2
#define ENTER_switch PIN_A1
int8 UP_switch_is_down = FALSE; // button flags
int8 DOWN_switch_is_down = FALSE;
int8 ENTER_switch_is_down = FALSE;
#include <menu_structure.h>
#include <menu_structure.c>
unsigned int8 COUNTER = 0;
int8 GO = 0; // GO flag, indicates start of main loop
int8 Tmp = 0;
int8 Heartbeat = 0;
#define FOSC getenv("CLOCK") // Get PIC oscillator frequency
// check if it is below or equal to 20MHz
#if(FOSC < 21000000)
#define TIMER0_PRELOAD (256 - (FOSC/4/256/100))
#else
#error Oscillator frequency is too high: FOSC
#endif
#define LED1 PIN_D3
#define LED2 PIN_D4
#define LED3 PIN_D5
int8 Cntr = 0;
// ****************************************************************************
// function declarations
// ****************************************************************************
void timer0_init(void);
// ****************************************************************************
#INT_TIMER0
void timer0_isr(void){
Cntr++;
if(Cntr == 5){ // toggle led every 100ms
output_toggle(LED1);
Cntr = 0;
}
// debounce
int8 active_state_UP, previuos_state_UP,
active_state_DOWN, previuos_state_DOWN,
active_state_ENTER, previuos_state_ENTER;
set_rtcc(TIMER0_PRELOAD); // Reload Timer0 for 10ms rate
active_state_UP = input(UP_switch); // Read the button
active_state_DOWN = input(DOWN_switch); // Read the button
active_state_ENTER= input(ENTER_switch); // Read the button
if((previuos_state_UP == 1) && (active_state_UP == 0)){
UP_switch_is_down = TRUE; // raise "BUTTON PRESED" flag. Must be cleared in software.
// output_toggle(LED1);
}
if((previuos_state_DOWN == 1) && (active_state_DOWN == 0)){
DOWN_switch_is_down = TRUE; // raise "BUTTON PRESED" flag
// output_toggle(LED2);
}
if((previuos_state_ENTER == 1) && (active_state_ENTER == 0)){
ENTER_switch_is_down = TRUE; // raise "BUTTON PRESED" flag
// output_toggle(LED3);
}
previuos_state_UP = active_state_UP; // Save current value for next time
previuos_state_DOWN = active_state_DOWN; // Save current value for next time
previuos_state_ENTER = active_state_ENTER; // Save current value for next time
}
// ****************************************************************************
#INT_TIMER1 // cca. 131ms overflow
void TIMER1_isr(void) {
COUNTER++;
if(COUNTER == 16){
COUNTER = 0;
GO = 1;
Heartbeat++; // display a changing symbol on the LCD to see it is working
}
}
// ****************************************************************************
// ****************************************************************************
void main() {
setup_timer_1(T1_INTERNAL|T1_DIV_BY_2); //131 ms overflow
enable_interrupts(INT_TIMER1);
timer0_init();
enable_interrupts(GLOBAL);
port_b_pullups(true);
lcd_init(); // init LCD
Delay_ms(100);
lcd_putc('\f');
while(TRUE){
lcd_gotoxy(1,1);
lcd_putc("Press ENTER for menu");
if(ENTER_switch_is_down){
ENTER_switch_is_down = 0;
browse_menu ();
}
delay_ms(100);
} // while true
} // main
// ****************************************************************************
// FUNCTIONS
// ****************************************************************************
void timer0_init(void)
{
setup_timer_0(T0_INTERNAL | T0_DIV_256 | T0_8_BIT);
set_timer0(TIMER0_PRELOAD);
clear_interrupt(INT_TIMER0);
enable_interrupts(INT_TIMER0);
}
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and
menu.h
| Code: |
#include <18F4550.h>
#device ADC=10
//#device PASS_STRINGS = IN_RAM //copy all the strings to RAM to allow access with pointer
#FUSES NOWDT //No Watch Dog Timer
#FUSES DEBUG
#device ICD=TRUE
#use delay(internal, clock=8000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=RS232,errors)
#use i2c(Master,Slow,sda=PIN_B0,scl=PIN_B1, force_hw)
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Again, many thanks to the author of the tutorial.
Last edited by PrinceNai on Sun Jun 30, 2019 9:50 am; edited 3 times in total |
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PrinceNai
Joined: 31 Oct 2016
Posts: 554
Location: Montenegro
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| Posted: Sat Jun 29, 2019 11:16 am |
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There was a mistake in the code, per Mr. Alan's suggestion edited in the original post.
Last edited by PrinceNai on Sat Jun 29, 2019 12:45 pm; edited 1 time in total |
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alan
Joined: 12 Nov 2012
Posts: 358
Location: South Africa
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| Posted: Sat Jun 29, 2019 11:21 am |
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| You know that you can edit your own post and do the correction there. |
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PrinceNai
Joined: 31 Oct 2016
Posts: 554
Location: Montenegro
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| Posted: Sat Jun 29, 2019 12:45 pm |
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| I do now :-). Thanks. |
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