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printat function

 
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dexta64



Joined: 19 Feb 2019
Posts: 11

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printat function
PostPosted: Wed Dec 01, 2021 7:45 am     Reply with quote
Those who want the function can develop more complex.
But I will simply share.
Code:

#define printat(x,y,_str,nmr) do{ \
  lcd_gotoxy(x,y); \
  printf(lcd_putc,_str,nmr); \ 
}while(0);

or
Code:

#define printat(x,y,_str,nmr,nmr1) do{ \
  lcd_gotoxy(x,y); \
  printf(lcd_putc,_str,nmr,nmr1); \ 
}while(0);

Here's the usage
Code:

int8 month=12;
printat(1,1,"MONTH: %02d",month);

or
Code:

int16 year=2021;
printat(1,1,"YEAR: %lu",year);

or this is how it is defined
Code:

#define printat(x,y,_str,nmr,nmr1) do{ \
  lcd_gotoxy(x,y); \
  printf(lcd_putc,_str,nmr,nmr1); \ 
}while(0);

int16 year=2021;
int8 month=12;
printat(1,1,"Date: %lu/%02d",year,month);
jeremiah



Joined: 20 Jul 2010
Posts: 1353

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PostPosted: Thu Dec 02, 2021 10:12 am     Reply with quote
you can also use variant macro arguments:

Code:


#define printat(x,y,_str,...) do{ \
  lcd_gotoxy(x,y); \
  printf(lcd_putc,_str,__VA_ARGS__); \
}while(0);



Also you can also use multiple statement syntax if you like:

Code:

#define printat(x,y,_str,...)  \
  (lcd_gotoxy(x,y), printf(lcd_putc,_str,__VA_ARGS__))
dexta64



Joined: 19 Feb 2019
Posts: 11

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PostPosted: Tue Dec 07, 2021 1:34 am     Reply with quote
jeremiah thank you so much. It had puzzled me for days.
"__VA_ARGS__"
is that the magic command? I shared well.

Code:


typedef struct
{
  uint8_t day;
  uint8_t month;
  uint8_t year;
  uint8_t dow;
  uint8_t hour;
  uint8_t min;
  uint8_t sec;
}t_time;
t_time date;

printat(1,1,"TEST");
printat(2,1,"T:%02d/%02d/%02d-%02d:%02d",date.day,date.month,date.year,date.hour,date.min);


it works perfectly.
Ttelmah



Joined: 11 Mar 2010
Posts: 19537

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PostPosted: Tue Dec 07, 2021 1:55 am     Reply with quote
Not a 'magic command', just a deeper bit of C for handling things with
variable length argument lists. It's called a 'variadic macro'.

[url]
https://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html
[/url]

It is in the K&R C reference.
dexta64



Joined: 19 Feb 2019
Posts: 11

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PostPosted: Tue Dec 07, 2021 3:26 am     Reply with quote
other I have defined and working

The lcd_puts command is like this in the lcd driver.
Code:

void lcd_puts(char * str)
{
  while (*str != '\0') //\0 will scan the inside of lcdtxt until you see this
                              //statement.
  {   
    lcd_putc(*str);
    str++;
  }
}

my definitions
Code:

//
#define printat(x,y,_str,...)  \
  (lcd_gotoxy(x,y), printf(lcd_putc,_str,__VA_ARGS__))

//command i get string from rom
//My goal is to save ram space.
#define printst(x,y,_str)  \
  (lcd_gotoxy(x,y), strcpy(lcdtxt,_str), lcd_puts(lcdtxt)) //lcdtxt be very careful here.
//This way it uses a lot of ram. Also the Rom area.
#define printstr(x,y,_str,...)  \
  (lcd_gotoxy(x,y), sprintf(lcdtxt,_str,__VA_ARGS__), lcd_puts(lcdtxt))  //lcdtxt be very careful here.


#device PASS_STRINGS=IN_RAM without using this definition.
reads the definition directly from the Rom.

Code:

unsigned char lcdtxt[16]; //regular program variable that I defined once. I throw my writings in it.

const char menuprgstatus[2][12]={
"ON STAND-BY",
"WORKING    "};


Code:

//on my lcd drive x=row, y=column
printst(1,1,menuprgstatus[0]);
printst(2,1,menuprgstatus[1]);


Last edited by dexta64 on Tue Dec 07, 2021 3:51 am; edited 3 times in total
dexta64



Joined: 19 Feb 2019
Posts: 11

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PostPosted: Tue Dec 07, 2021 3:32 am     Reply with quote
Ttelmah thank you so much.
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