Chipset SM16208SJ Y-Index Error

[Jiwno]

While I'm testing index with led Matrix using chipset SM16208SJ, I found an error with Y index.

X indexes are correct but y indexes are wrong.

Is there anyone who knows how to solve this problem?

Untitled.mp4

[board707]

While I'm testing index with led Matrix using chipset SM16208SJ, I found an error with Y index.

Every LED panel uses two types of IC to control the leds - the driver to manipulate individual pixels and the multiplexer to switch led rows on and off. You have a problem not with driver SM16208 (it is a standard driver, compatible with the library). According to your photo, your panel uses TC7558 as multiplexer. This is a SHIFT-Register type multiplexer. You have to set up the library accordingly.
I have no idea, is it compatible with ESP32-HUB75-MatrixPanel-DMA code, ask @mrfaptastic

[mrcodetastic]

What's another library this panel works with? PxMatrix?

If so, what configuration. I'll look at how the code works there for insight then.

[board707]

If I remember correctly, PxMatrix supports panels with a shift register multiplex.
I also have this option in my library.

The principle there is simple - a HUB pins A B C are connected to shift register, usually A is CLK, B = LAT and C = DATA.
When you need to switch a row, you push a byte into the register, where the bit corresponding to the row is 1, and the rest are zero

Example code:

void set_mux(uint8_t curr_row) override {
		// Just shift the row mux by one for incremental access
		digitalWrite(pin_DMD_B, HIGH);                    // Latch open
		digitalWrite(pin_DMD_C, (curr_row == 0));   // Shift out 1 for line 0, 0 otherwise
		digitalWrite(pin_DMD_A, HIGH);                  // Clock out this bit
		digitalWrite(pin_DMD_A, LOW);
		digitalWrite(pin_DMD_B, LOW);                   // Latch close
	}

[board707]

Addition
As I see, the shift type multiplexing has already been added to the library by DarrylStrong
#164