LTDC STM32H753 Debug crashes

[Franksterb92]

wrote a basic test for ltdc and if i change any of the ltdc registers and pause the debug it crashes heres the functions for the ltdc ive wrote

void ltdc_gpio_init(void){

	//GPIO B,C,D,E,F,G,H,I,J,K Clock Access
	RCC->AHB4ENR |= (1U<<1);//PORTB
	RCC->AHB4ENR |= (1U<<2);//PORTC
	RCC->AHB4ENR |= (1U<<3);//PORTD
	RCC->AHB4ENR |= (1U<<4);//PORTE
	RCC->AHB4ENR |= (1U<<5);//PORTF
	RCC->AHB4ENR |= (1U<<6);//PORTG
	RCC->AHB4ENR |= (1U<<7);//PORTH
	RCC->AHB4ENR |= (1U<<8);//PORTI
	RCC->AHB4ENR |= (1U<<9);//PORTJ
	RCC->AHB4ENR |= (1U<<10);//PORTK

	//MODE
	GPIOB->MODER |= (1U<<3);//PB1 AF MODE
	GPIOB->MODER &=~(1U<<2);

	GPIOC->MODER |= (1U<<1);//PC0 AF MODE
	GPIOC->MODER &=~(1U<<0);

	GPIOD->MODER |= (1U<<13);//PD6 AF MODE
	GPIOD->MODER &=~(1U<<12);

	GPIOE->MODER |= (1U<<9);//PE4 AF MODE
	GPIOE->MODER &=~(1U<<8);

	GPIOE->MODER |= (1U<<11);//PE5 AF MODE
	GPIOE->MODER &=~(1U<<10);

	GPIOE->MODER |= (1U<<13);//PE6 AF MODE
	GPIOE->MODER &=~(1U<<12);

	GPIOF->MODER |= (1U<<21);//PF10 AF MODE
	GPIOF->MODER &=~(1U<<20);

	GPIOG->MODER |= (1U<<15);//PG7 AF MODE
	GPIOG->MODER &=~(1U<<14);

	GPIOG->MODER |= (1U<<21);//PG10 AF MODE
	GPIOG->MODER &=~(1U<<20);

	GPIOG->MODER |= (1U<<23);//PG11 AF MODE
	GPIOG->MODER &=~(1U<<22);

	GPIOG->MODER |= (1U<<25);//PG12 AF MODE
	GPIOG->MODER &=~(1U<<24);

	GPIOH->MODER |= (1U<<5);//PH2 AF MODE
	GPIOH->MODER &=~(1U<<4);

	GPIOH->MODER |= (1U<<7);//PH3 AF MODE
	GPIOH->MODER &=~(1U<<6);

	GPIOH->MODER |= (1U<<17);//PH8 AF MODE
	GPIOH->MODER &=~(1U<<16);

	GPIOH->MODER |= (1U<<19);//PH9 AF MODE
	GPIOH->MODER &=~(1U<<18);

	GPIOH->MODER |= (1U<<21);//PH10 AF MODE
	GPIOH->MODER &=~(1U<<20);

	GPIOI->MODER |= (1U<<9);//PI4 AF MODE
	GPIOI->MODER &=~(1U<<8);

	GPIOI->MODER |= (1U<<11);//PI5 AF MODE
	GPIOI->MODER &=~(1U<<10);

	GPIOI->MODER |= (1U<<13);//PI6 AF MODE
	GPIOI->MODER &=~(1U<<12);

	GPIOI->MODER |= (1U<<15);//PI7 AF MODE
	GPIOI->MODER &=~(1U<<14);

	GPIOI->MODER |= (1U<<19);//PI9 AF MODE
	GPIOI->MODER &=~(1U<<18);

	GPIOI->MODER |= (1U<<21);//PI10 AF MODE
	GPIOI->MODER &=~(1U<<20);

	GPIOJ->MODER |= (1U<<13);//PJ6 AF MODE
	GPIOJ->MODER &=~(1U<<12);

	GPIOJ->MODER |= (1U<<19);//PJ9 AF MODE
	GPIOJ->MODER &=~(1U<<18);

	GPIOJ->MODER |= (1U<<23);//PJ11 AF MODE
	GPIOJ->MODER &=~(1U<<22);

	GPIOK->MODER |= (1U<<1);//PK0 AF MODE
	GPIOK->MODER &=~(1U<<0);

	GPIOK->MODER |= (1U<<3);//PK1 AF MODE
	GPIOK->MODER &=~(1U<<2);

	GPIOK->MODER |= (1U<<5);//PK2 AF MODE
	GPIOK->MODER &=~(1U<<4);

	//Alternate Function
	GPIOB->AFR[0] |= (1U<<7);//PB1 AF 14
	GPIOB->AFR[0] |= (1U<<6);
	GPIOB->AFR[0] |= (1U<<5);
	GPIOB->AFR[0] &=~(1U<<4);

	GPIOC->AFR[0] |= (1U<<3);//PC0 AF 14
	GPIOC->AFR[0] |= (1U<<2);
	GPIOC->AFR[0] |= (1U<<1);
	GPIOC->AFR[0] &=~(1U<<0);

	GPIOD->AFR[0] |= (1U<<27);//PD6 AF 14
	GPIOD->AFR[0] |= (1U<<26);
	GPIOD->AFR[0] |= (1U<<25);
	GPIOD->AFR[0] &=~(1U<<24);

	GPIOE->AFR[0] |= (1U<<19);//PE4 AF 14
	GPIOE->AFR[0] |= (1U<<18);
	GPIOE->AFR[0] |= (1U<<17);
	GPIOE->AFR[0] &=~(1U<<16);

	GPIOE->AFR[0] |= (1U<<23);//PE5 AF 14
	GPIOE->AFR[0] |= (1U<<22);
	GPIOE->AFR[0] |= (1U<<21);
	GPIOE->AFR[0] &=~(1U<<20);

	GPIOE->AFR[0] |= (1U<<27);//PE6 AF 14
	GPIOE->AFR[0] |= (1U<<26);
	GPIOE->AFR[0] |= (1U<<25);
	GPIOE->AFR[0] &=~(1U<<24);

	GPIOF->AFR[1] |= (1U<<11);//PF10 AF 14
	GPIOF->AFR[1] |= (1U<<10);
	GPIOF->AFR[1] |= (1U<<9);
	GPIOF->AFR[1] &=~(1U<<8);

	GPIOG->AFR[0] |= (1U<<31);//PG7 AF 14
	GPIOG->AFR[0] |= (1U<<30);
	GPIOG->AFR[0] |= (1U<<29);
	GPIOG->AFR[0] &=~(1U<<28);

	GPIOG->AFR[1] |= (1U<<11);//PG10 AF 14
	GPIOG->AFR[1] |= (1U<<10);
	GPIOG->AFR[1] |= (1U<<9);
	GPIOG->AFR[1] &=~(1U<<8);

	GPIOG->AFR[1] |= (1U<<15);//PG11 AF 14
	GPIOG->AFR[1] |= (1U<<14);
	GPIOG->AFR[1] |= (1U<<13);
	GPIOG->AFR[1] &=~(1U<<12);

	GPIOG->AFR[1] |= (1U<<19);//PG12 AF 14
	GPIOG->AFR[1] |= (1U<<18);
	GPIOG->AFR[1] |= (1U<<17);
	GPIOG->AFR[1] &=~(1U<<16);

	GPIOH->AFR[0] |= (1U<<11);//PH2 AF 14
	GPIOH->AFR[0] |= (1U<<10);
	GPIOH->AFR[0] |= (1U<<9);
	GPIOH->AFR[0] &=~(1U<<8);

	GPIOH->AFR[0] |= (1U<<15);//PH3 AF 14
	GPIOH->AFR[0] |= (1U<<14);
	GPIOH->AFR[0] |= (1U<<13);
	GPIOH->AFR[0] &=~(1U<<12);

	GPIOH->AFR[1] |= (1U<<3);//PH8 AF 14
	GPIOH->AFR[1] |= (1U<<2);
	GPIOH->AFR[1] |= (1U<<1);
	GPIOH->AFR[1] &=~(1U<<0);

	GPIOH->AFR[1] |= (1U<<7);//PH9 AF 14
	GPIOH->AFR[1] |= (1U<<6);
	GPIOH->AFR[1] |= (1U<<5);
	GPIOH->AFR[1] &=~(1U<<4);

	GPIOH->AFR[1] |= (1U<<11);//PH10 AF 14
	GPIOH->AFR[1] |= (1U<<10);
	GPIOH->AFR[1] |= (1U<<9);
	GPIOH->AFR[1] &=~(1U<<8);

	GPIOI->AFR[0] |= (1U<<19);//PI4 AF 14
	GPIOI->AFR[0] |= (1U<<18);
	GPIOI->AFR[0] |= (1U<<17);
	GPIOI->AFR[0] &=~(1U<<16);

	GPIOI->AFR[0] |= (1U<<23);//PI5 AF 14
	GPIOI->AFR[0] |= (1U<<22);
	GPIOI->AFR[0] |= (1U<<21);
	GPIOI->AFR[0] &=~(1U<<20);

	GPIOI->AFR[0] |= (1U<<27);//PI6 AF 14
	GPIOI->AFR[0] |= (1U<<26);
	GPIOI->AFR[0] |= (1U<<25);
	GPIOI->AFR[0] &=~(1U<<24);

	GPIOI->AFR[0] |= (1U<<31);//PI7 AF 14
	GPIOI->AFR[0] |= (1U<<30);
	GPIOI->AFR[0] |= (1U<<29);
	GPIOI->AFR[0] &=~(1U<<28);

	GPIOI->AFR[1] |= (1U<<7);//PI9 AF 14
	GPIOI->AFR[1] |= (1U<<6);
	GPIOI->AFR[1] |= (1U<<5);
	GPIOI->AFR[1] &=~(1U<<4);

	GPIOI->AFR[1] |= (1U<<11);//PI10 AF 14
	GPIOI->AFR[1] |= (1U<<10);
	GPIOI->AFR[1] |= (1U<<9);
	GPIOI->AFR[1] &=~(1U<<8);

	GPIOJ->AFR[0] |= (1U<<27);//PJ6 AF 14
	GPIOJ->AFR[0] |= (1U<<26);
	GPIOJ->AFR[0] |= (1U<<25);
	GPIOJ->AFR[0] &=~(1U<<24);

	GPIOJ->AFR[1] |= (1U<<7);//PJ9 AF 14
	GPIOJ->AFR[1] |= (1U<<6);
	GPIOJ->AFR[1] |= (1U<<5);
	GPIOJ->AFR[1] &=~(1U<<4);

	GPIOJ->AFR[1] |= (1U<<15);//PJ11 AF 14
	GPIOJ->AFR[1] |= (1U<<14);
	GPIOJ->AFR[1] |= (1U<<13);
	GPIOJ->AFR[1] &=~(1U<<12);

	GPIOK->AFR[0] |= (1U<<3);//PK0 AF 14
	GPIOK->AFR[0] |= (1U<<2);
	GPIOK->AFR[0] |= (1U<<1);
	GPIOK->AFR[0] &=~(1U<<0);

	GPIOK->AFR[0] |= (1U<<7);//PK1 AF 14
	GPIOK->AFR[0] |= (1U<<6);
	GPIOK->AFR[0] |= (1U<<5);
	GPIOK->AFR[0] &=~(1U<<4);

	GPIOK->AFR[0] |= (1U<<11);//PK2 AF 14
	GPIOK->AFR[0] |= (1U<<10);
	GPIOK->AFR[0] |= (1U<<9);
	GPIOK->AFR[0] &=~(1U<<8);


}
void ltdc_init(void){

	//ltdc_gpio_init();

	//clock access to LTDC
	RCC->APB3ENR |= (1U<<3);

	//RCC->APB3RSTR |= (1U<<3);
	//RCC->APB3RSTR &=~(1U<<3);

	//LTDC->GCR |= (1U<<0);
	//LTDC->GCR &=~(1U<<0);


	//for(int i = 0; i <(0xFFFFU * 20U); i++){}
	//for(int i = 0; i <(0xFFFFU * 20U); i++){}
	//H Synch Timings
	LTDC->SSCR |= ((HSW - 1) << 16);
	//test_led();
	LTDC->BPCR |= ((HSW + HBP -1) << 16);
	LTDC->AWCR |= (HSW + HBP + ACTIVE_WIDTH - 1) << 16;
	LTDC->TWCR |= (HSW + HBP + ACTIVE_WIDTH + HFP -1) << 16;
	//V sync timing
	LTDC->SSCR |= (VSW - 1) << 0;
	LTDC->BPCR |= (VSW + VBP -1) << 0;
	LTDC->AWCR |= (VSW + VBP + ACTIVE_WIDTH - 1) << 0;
	LTDC->TWCR |= (VSW + VBP + ACTIVE_WIDTH + VFP -1) << 0;
	//background color
	LTDC->BCCR |= 0xFF0000U;
	//default polarity for hsync vsync dotcolck enable

	//enable the LTDC Periph
	LTDC->GCR |= (1U<<0);
}

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[Imen.D · Accepted solution]

Hello @Franksterb92 

I think you encountered the limitation when accessing LTDC registers as described in the STM32H753 Errata sheet 

[Franksterb92]

so would that just be setting the DIVR3EN Bit in the PLLCFGR to 1 to feed the pll3 to the ltdc if so i tried that and it does the same thing 

[Franksterb92]

lol i see it now its in the rcc cr register i added 

RCC->CR |= (1U<<28) to enable pll3

while(!(RCC->CR & (1U<<29){} to wait for pll3 ready 

wow i feel dumb now it works for now thank you so much