Important changes to forums and questions
All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.
7 years, 11 months ago.
8" Buydisplay LCD with capacitiv touch
Hi mbed-friends,
I got an 7" Buydisplay LCD. (I mispelled 8" in the title) It is based on the RA8875 controller. http://www.buydisplay.com/default/7-inch-lcd-module-capacitive-touch-screen-panel-i2c-spi-serial
The RA8875_Demo runs just fine (on the Seeed Arch Pro). https://developer.mbed.org/users/WiredHome/code/RA8875_Demo/
Only when I try to use the Arial12x12 bitmapped font instead of the built-in font, it prints a square block of about 100x100 pixels, with 'random' pixels on and of, for each printed character.
Below, I print just one character (I got some bitmap):
lcd.set_font("Arial12x12");
lcd.puts(400,240, "A");
Has anybody used this display, and got bitmapped fonts working just fine?
Below my code
#include "mbed.h"
#include "RA8875.h"
#define PIN_SCLK D13
#define PIN_MISO D12
#define PIN_MOSI D11
#define PIN_CS_TFT D10 // chip select pin
#define PIN_DC_TFT D9 // data/command select pin.
#define PIN_RESET_TFT D8
#define PIN_BL_TFT D7
#define PIN_CS_SD D4
Serial pc(USBTX, USBRX);
int main()
{
int i;
Timer t;
float f = 10000000;
pc.baud(460800); // I like a snappy terminal, so crank it up!
pc.printf("\r\nRA8875 Test - Build " __DATE__ " " __TIME__ "\r\n");
pc.printf("Turning on display\r\n");
RA8875 lcd(PIN_MOSI, PIN_MISO, PIN_SCLK, PIN_CS_TFT, PIN_RESET_TFT, "tft"); // MOSI, MISO, SCK, /ChipSelect, /reset, name
t.start();
// lcd.init();
lcd.init(800, 480, 16, true, true, true);
// lcd.frequency(f);
lcd.cls();
lcd.Backlight_u8(255);
lcd.SetOrientation(RA8875::normal);
lcd.cls();
uint32_t tStart = t.read_us();
lcd.foreground(RGB(255,255,255));
lcd.claim(stdout);
lcd.background(Black);
lcd.printf("Hello mbed!\r\n");
printf("RA8875_Demo\r\n");
lcd.puts(0,32,
"RA8875 lcd(D11, D12, D13, D10, D8, \"tft\");\r\n"
"lcd.init(true, 480,272,16);\r\n"
"lcd.circle( 400,25, 25, BrightRed);\r\n"
"lcd.fillcircle( 400,25, 15, RGB(128,255,128));\r\n"
"lcd.ellipse( 440,75, 35,20, BrightBlue);\r\n"
"lcd.fillellipse( 440,75, 25,10, Blue);\r\n"
"lcd.triangle( 440,100, 475,110, 450,125, Magenta);\r\n"
"lcd.filltriangle( 445,105, 467,111, 452,120, Cyan);\r\n"
"lcd.rect( 400,130, 475,155, Brown);\r\n"
"lcd.fillrect( 405,135, 470,150, Pink);\r\n"
"lcd.roundrect( 410,160, 475,190, 10,8, Yellow);\r\n"
"lcd.fillroundrect(415,165, 470,185, 5,3, Orange);\r\n"
"lcd.line( 430,200, 460,230, RGB(0,255,0));\r\n"
"for (i=0; i<=30; i+=5)\r\n"
" lcd.pixel(435+i,200+i, White);");
lcd.circle( 400,25, 25, BrightRed);
lcd.fillcircle( 400,25, 15, RGB(128,255,128));
lcd.ellipse( 440,75, 35,20, BrightBlue);
lcd.fillellipse( 440,75, 25,10, Blue);
lcd.triangle( 440,100, 475,110, 450,125, Magenta);
lcd.filltriangle( 445,105, 467,111, 452,120, Cyan);
lcd.rect( 400,130, 475,155, Brown);
lcd.fillrect( 405,135, 470,150, Pink);
lcd.roundrect( 410,160, 475,190, 10,8, Yellow);
lcd.fillroundrect(415,165, 470,185, 5,3, Orange);
lcd.line( 430,200, 460,230, RGB(0,255,0));
for (i=0; i<=30; i+=5)
lcd.pixel(435+i,200+i, White);
uint32_t tEnd = t.read_us();
lcd.foreground(RGB(255,255,255));
lcd.printf("@ %4.2f MHz, elapsed time is %u usec.\r\n", (float)f/1000000, tEnd-tStart);
lcd.set_font("Arial12x12");
lcd.puts(400,240, "A");
while(1) {
}
}
Best regards, Jack.
1 Answer
7 years, 11 months ago.
Hi Jack, Paul,
Sorry I didn't see this sooner, but I see also that you got it sorted out. My first quick thought was to check the return value - but in looking at the code, that won't work - as you see below.
RetCode_t GraphicsDisplay::set_font(const unsigned char * _font)
{
font = _font; // trusting them, but it might be good to put some checks in here...
return noerror;
}
My current RA8875-based projects are [presently] complete and stable, so I don't know if I'll get a chance to address this before this fall. If either of you propose a [more robust] change with a pull request, I could easily do a quick review and honor that.
Hi David,
The display works just fine with your library on an Arch Pro and on the much faster Arch Max.
These fonts are fast-rendered build-in fonts, using the optional ER3304-1 font chip.
Regards, Jack.
posted by 17 Jun 2015Hi David, I wrote a simple 5-point Capacitive touch panel driver for the FT5206. https://developer.mbed.org/users/JackB/code/FT5206/ Regards, Jack.
posted by 18 Jun 2015
Just tried, (I have the 8" version), same issue, also with the "Small_6" font. Did you get the font chip ?
edit..
I have sent a message to David Smart about this in case he knows the answer.
posted by Paul Staron 16 Jun 2015Hi Vitaliy, yes I ordered the font chip ER3304-1. But honestly, I amused it is just the build-in font shown on the photo? I will try to get Capacitive touch working later. Regards, Jack
posted by Jack Berkhout 16 Jun 2015Hi,
I sorted it out, stupid error from me. I let it point to the string "Arial12x12" and some memory following it. The pointer just needs to point to the actual font character array, so I had to leave out the quotes at the font name:
lcd.set_font(Arial12x12); lcd.puts(400,240, "A");Regards, Jack.
posted by Jack Berkhout 16 Jun 2015These are working as well Jack:
https://developer.mbed.org/users/star297/code/HY-1_8TFT_fonts_ST7735/
Import the library and #include the font files you want to use.
posted by Paul Staron 16 Jun 2015Hi Paul,
Hi Paul, thank you very much! I have created quite a lot as well, Calibri, Monaco, Consolas, Courier, Terminal, Verdana, and a couple more. You may find them on my page. Do I need this "align(2)" that I found somewhere?
/** Arial Font with 12*12 matrix to use with SPI_TFT lib */ __align(2) const unsigned char Arial12x12[] = { 25, 12, 12, 2, // Bytes/char, horz, vert, byte/vertAlso, is it best practice to use the define statement to have it referenced only once?