STM32,U8G2,ST7920 in Parallel glitches

[Barbaror4]

Hello,i have recently bought an STM32F103C8T6(64KB Flash variant) along with ST7920,in SPI it works fine,but i need fast animations,in parallel it glitches out,the sketch i was running is the GraphicsTest included in U8G2,here are the pins i used,
PB3 -> DB0
PB4 -> DB1
PB5 -> DB2
PB6 -> DB3
PB7 -> DB4
PB8 -> DB5
PB9 -> DB6
PB12 -> DB7
PB10 -> E
PB1 -> RS
PB14 -> RST
RW Tied to ground
PSB is soldered in the Paralell position on the lcd board,
I have tried the 8080 constructor,it doesnt work,

[olikraus]

I think you need to tweak the timing:

u8g2/csrc/u8x8_d_st7920.c

Lines 327 to 351 in e1ce4e5

	static const u8x8_display_info_t u8x8_st7920_128x64_display_info =
	{
	/* chip_enable_level = */ 1,
	/* chip_disable_level = */ 0,
	/* post_chip_enable_wait_ns = */ 5,
	/* pre_chip_disable_wait_ns = */ 5,
	/* reset_pulse_width_ms = */ 1,
	/* post_reset_wait_ms = */ 6,
	/* sda_setup_time_ns = */ 20,
	/* sck_pulse_width_ns = */ 140, /* datasheet ST7920 */
	/* sck_clock_hz = */ 1000000UL, /* since Arduino 1.6.0, the SPI bus speed in Hz. Should be 1000000000/sck_pulse_width_ns */
	/* ST7920+Due work with 1MHz but not with 2MHz, ST7920+Uno works with 2MHz */
	/* spi_mode = */ 3, /* active high, rising edge, 18 Aug 16: changed from 1 to 3 which works for 101 */
	/* in theory mode 3 should be correct */
	/* i2c_bus_clock_100kHz = */ 4,
	/* data_setup_time_ns = */ 30,
	/* write_pulse_width_ns = */ 40,
	/* tile_width = */ 16,
	/* tile_height = */ 8,
	/* default_x_offset = */ 0,
	/* flipmode_x_offset = */ 0,
	/* pixel_width = */ 128,
	/* pixel_height = */ 64
	};

Especially increase write pulse width and setup time.