M5Paper partial Update Canvas

Reply to M5Paper partial Update Canvas on Sun, 14 Feb 2021 12:32:45 GMT

murraypaul — Sun, 14 Feb 2021 12:32:45 GMT

As mentioned in the other thread, the missing step is transferring the canvas framebuffer to the EPD.
If your loop function is changed as below, it works as you expect.

void loop() {
  for (int i=1; i<7; i++)
  {
    canvas1.drawString(testString[i],20,20);
    /* m5epd_err_t UpdateArea(uint16_t x, uint16_t y, uint16_t w, uint16_t h, m5epd_update_mode_t mode); */
    M5.EPD.WriteFullGram4bpp((uint8_t*)canvas1.frameBuffer());
    M5.EPD.UpdateArea(0,0,100,100,UPDATE_MODE_GL16);
    delay(1000);
  }
}

Reply to M5Paper partial Update Canvas on Fri, 12 Feb 2021 19:18:03 GMT

Powersoft — Fri, 12 Feb 2021 19:18:03 GMT

@ajb2k3
I espect to see the characters be changed at the fix place. Do you have try to run my simple program?

Reply to M5Paper partial Update Canvas on Fri, 12 Feb 2021 19:14:39 GMT

Powersoft — Fri, 12 Feb 2021 19:14:39 GMT

@ajb2k3 said in M5Paper partial Update Canvas:

You need to also include the M5stack libraries.

Wat do you mean with that? This simple program is complete or not?

Reply to M5Paper partial Update Canvas on Fri, 12 Feb 2021 12:40:30 GMT

ajb2k3 — Fri, 12 Feb 2021 12:40:30 GMT

You need to also include the M5stack libraries.
What do you mean "not what you expect"
any error message?
Can you post a picture of the screen?

Reply to M5Paper partial Update Canvas on Fri, 12 Feb 2021 11:09:22 GMT

Powersoft — Fri, 12 Feb 2021 11:09:22 GMT

@ajb2k3
Thanks, I wont to update (redraw) every time a new character, without updating the whole screen. But the command is not do that what I expect.
Her my short test program. What is wrong ont it?

#include
M5EPD_Canvas canvas1(&M5.EPD);

String testString[]={"A","B","C","D","E","F","G"};

void setup() {
M5.begin();
M5.TP.SetRotation(180);
M5.EPD.SetRotation(180);
M5.EPD.Clear(true);
canvas1.createCanvas(960, 540);
canvas1.loadFont("/fonts/GenSenRounded-R.ttf", SD);
canvas1.createRender(60);
canvas1.setTextSize(60);
canvas1.drawString("A",20,20);
canvas1.pushCanvas(0, 0, UPDATE_MODE_GL16);
}

void loop() {
for (int i=1; i<7; i++)
{
canvas1.drawString(testString[i],20,20);
/* m5epd_err_t UpdateArea(uint16_t x, uint16_t y, uint16_t w, uint16_t h, m5epd_update_mode_t mode); */
M5.EPD.UpdateArea(0,0,100,100,UPDATE_MODE_GL16);
delay(1000);
}
}

Cheers
Jan.

Reply to M5Paper partial Update Canvas on Thu, 11 Feb 2021 19:43:13 GMT

ajb2k3 — Thu, 11 Feb 2021 19:43:13 GMT

m5epd_err_t UpdateArea(100,100,100,100)
would update an area of 100 px X 100px with the top left corner starting at position X=100, Y=100.