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rubenskc
Joined: 28 Sep 2011
Posts: 12
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| How to display char variable with flex lcd? |
 Posted: Wed Sep 28, 2011 1:56 pm |
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First of all, thank you very much for the creators / collaborators of this LCD driver! Just with 5 minutes editing I made my project WOW, from 0 to 100% functional! It works just perfectly!!! One question only: how to show the contents of a char variable (I'm using CCS)?
Check my sample below, part of my working code (everything works fine, but the writing of the var):
| Code: |
sensor = read_adc(); // reads ADC
set_pwm1_duty(sensor); // set duty of PWM to servo
leitura_caracter = sensor; // send a int16 to char variable
lcd_putc("\f >> Leitura:\n"); // writes 1st line
lcd_putc(leitura_caracter); // writes contents of variable
delay_ms(800);
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So.... Whats wrong?? The second line of the LCD is always (
_________________
Rubs |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19436
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| Posted: Wed Sep 28, 2011 2:38 pm |
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It depends what you want to display....
lcd_putc, displays the _character_. If (for instance), your variable did contain the value 65 (0x41, ob1000001, 65), then you would see the character 'A' displayed, since this is what this number represents.
However you presumably want the numeric value printed out. For this the number would have to be converted into a sequence of ASCII characters, not just the one. The standard tool for this is 'printf'.
So:
| Code: |
leitura_caracter=65;
lcd_putc(leitura_caracter); //Displays 'A'
printf(lcd_putc,"%ld ",leitura_caracter); //Displays '65'
printf(lcd_putc,"%lu ",leitura_caracter); //Displays '65', but handles 0-255
printf(lcd_putc,"%lx ",leitura_caracter); //displays '41' - hex value
printf(lcd_putc,"%3.1lw ",leitura_caracter); //displays '6.5'
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There are others, but these are the commonest integer output formats. The difference between '%u', and '%d', is if the top bit of the value is set, with %d, the value is displayed as a -ve number.
The 'l' says to handle an int16/int32 value, rather than a int8 value.
The last format also important, allowing you to use an integer as a scaled decimal value.
Best Wishes |
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