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Format text on the OLED display

 
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vtrx



Joined: 11 Oct 2017
Posts: 141

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Format text on the OLED display
PostPosted: Fri Jul 24, 2020 4:19 pm     Reply with quote
I have an OLED display model SSD1306.
I have a function that shows the temperature in this format;

Code:
signed int16 chip_temp;

chip_temp = Get_Temperature ();


The routine for displaying on the LCD is;

Code:
SSD1306_DrawText (4,4, "123", 1);//x,y,Text,size


Using a regular LCD, I use this routine;

Code:
printf (LCD_Print, "Temp:% 02Lu.% 02Lu C", abs (chip_temp) / 100, abs (chip_temp)% 100);


How can I adapt to the OLED routine?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jul 24, 2020 5:46 pm     Reply with quote
How about this:
sprintf it to a buffer, then give the buffer to the SSD1306_Drawtext() routine.

Here is the output of the program shown below, in the MPLAB v8.92 output window:
Quote:
Temp: 10.00 C

Test program:
Code:

#include <18F46K22.h>
#fuses NOWDT 
#use delay(internal=4M)
#use rs232(UART1, baud=9600, ERRORS)

//------------------------------------
// Substitute function for testing with MPLAB v8.92 simulator.
// This function displays text in the UART1 output window.
void SSD1306_Drawtext(int8 x, int8 y, char *text, int8 size)
{
puts(text);
} 

//=================================
void main()
{
signed int16 chip_temp = 1000;
int8 buffer[20];

sprintf(buffer, "Temp: %02Ld.%02Ld C", abs(chip_temp) / 100, abs(chip_temp)% 100);
SSD1306_DrawText (4, 4, buffer, 1);

while(TRUE);
}
vtrx



Joined: 11 Oct 2017
Posts: 141

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PostPosted: Sun Jul 26, 2020 2:53 pm     Reply with quote
PCM programmer wrote:
How about this:
sprintf it to a buffer, then give the buffer to the SSD1306_Drawtext() routine.

Here is the output of the program shown below, in the MPLAB v8.92 output window:
Quote:
Temp: 10.00 C

Test program:
Code:

#include <18F46K22.h>
#fuses NOWDT 
#use delay(internal=4M)
#use rs232(UART1, baud=9600, ERRORS)

//------------------------------------
// Substitute function for testing with MPLAB v8.92 simulator.
// This function displays text in the UART1 output window.
void SSD1306_Drawtext(int8 x, int8 y, char *text, int8 size)
{
puts(text);
} 

//=================================
void main()
{
signed int16 chip_temp = 1000;
int8 buffer[20];

sprintf(buffer, "Temp: %02Ld.%02Ld C", abs(chip_temp) / 100, abs(chip_temp)% 100);
SSD1306_DrawText (4, 4, buffer, 1);

while(TRUE);
}


worked perfectly.
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