I am working on using SmartMatrix to drive a chain of 16x32 panels based on ESP32. I have identified the type panel is
SMARTMATRIX_HUB75_16ROW_32COL_MOD4SCAN_V4. I measure Hub75 PINs, C and D are connected to GND.
My PINOUT is from
mrfaptastic/ESP32 HUB75 LED MATRIX PANEL DMA Display:
#define R1_PIN GPIO_NUM_25
#define G1_PIN GPIO_NUM_26
#define B1_PIN GPIO_NUM_27
#define R2_PIN GPIO_NUM_14
#define G2_PIN GPIO_NUM_12
#define B2_PIN GPIO_NUM_13
#define A_PIN GPIO_NUM_23
#define B_PIN GPIO_NUM_19
#define C_PIN GPIO_NUM_5
#define D_PIN GPIO_NUM_17
#define E_PIN -1
#define LAT_PIN GPIO_NUM_4
#define OE_PIN GPIO_NUM_15
#define CLK_PIN GPIO_NUM_16
The problem is when power is supplied normally, the display cannot show correct, more flickering and ghosting.
But when I cut off power, the display shows correctly, Like this:
Plus, same device to drive a chain of 16x324SCAN panels (ICN2038S - standard
SMARTMATRIX_HUB75_16ROW_32COL_MOD4SCAN) is normal.
Must be something wrong, but I don’t known. Any suggestion appreciated!