STM32H7B3I -DK unable to activate LCD - screen through registers

richi · ‎2024-02-27

Please I need someone to review the code I wrote I double checked few times but am probably missing some info and configuration. I want to display red color on display module by only setting bits in the register. Here is the provided code. Someone please help I am working on a homework project.

#include <stdint.h>
#include "stm32h7b3xxq.h"
#include "reg_util.h"
#include "main.h"

void SystemClockSetup(void);
void VcoreSetup(void);
void LTDC_Peripheral_Init(void);
void LTDC_Peripheral_Setup(void);

int main(void)
{
  HAL_Init();
  SystemClockSetup();
  VcoreSetup();
  LTDC_Peripheral_Init();
  LTDC_Peripheral_Setup();

  /*Loop forever */
  for (;;);
}

void VcoreSetup(void)
{
 	//Povecaj wait states i latency

  FLASH->ACR |= (3 << 4);
  FLASH->ACR |= 0b0111;

 	//Disable SMP
 	//PWR -> CR3 &= ~(PWR_CR3_SMPSEN);

 	//Disable Bypass
 	//PWR -> CR3 &= ~(PWR_CR3_BYPASS);

 	//Wait for ACTVOSRDY bit
 	//while(!REG_READ_BIT(PWR -> CSR1,PWR_CSR1_ACTVOSRDY_Pos));

 	//Povisi voltage na VOS0;
  PWR->SRDCR |= (3 << 14);

 	//Wait for VOSRDY bit
 	//while(!REG_READ_BIT(PWR -> SRDCR,PWR_SRDCR_VOSRDY_Pos));

 	//Enable PLL1
  RCC->CR |= RCC_CR_PLL1ON;

 	//Wait for PLL stabilization
  while (!REG_READ_BIT(RCC->CR, RCC_CR_PLL1RDY_Pos));

 	//PLL as the main clock
  RCC->CFGR |= 3;	// pll1_p_ck je main clock

 	//Wait for confirmation

  while (!((RCC->CFGR >> 3) &(0x3) == (0x3)));

 	//Enable PLL3
  RCC->CR |= RCC_CR_PLL3ON;

 	//Wait for PLL stabilization
  while (!REG_READ_BIT(RCC->CR, RCC_CR_PLL3RDY_Pos));

 	//Omoguci clock za LTDC na APB3 busu
  RCC->APB3ENR |= RCC_APB3ENR_LTDCEN;

}

void SystemClockSetup(void)
{
 	//System Clock je HSI 64 MHz (default)

 	//DIVM1 i DIVM3 prescaler za smanjivanje frekvencije na 8 MHz
  RCC->PLLCKSELR |= RCC_PLLCKSELR_DIVM1_3;
  RCC->PLLCKSELR |= RCC_PLLCKSELR_DIVM3_3;

 	//Disable  pll2 divider
  RCC->PLLCKSELR &= ~(32 << 12);	//Disable PLL2

 	//Ja koristim pll3_r_ck i pll1_p_ck, ostale ugasiti
  RCC->PLLCFGR &= ~(RCC_PLLCFGR_DIVQ1EN);	//Disable Q1 divider
  RCC->PLLCFGR &= ~(RCC_PLLCFGR_DIVR1EN);	//Disable R1 divider

  RCC->PLLCFGR &= ~(RCC_PLLCFGR_DIVP3EN);	//Disable P3 divider
  RCC->PLLCFGR &= ~(RCC_PLLCFGR_DIVQ3EN);	//Disable Q3 divider

 	//Choose input VCO frequency range 8 - 16 MHz
  RCC->PLLCFGR |= RCC_PLLCFGR_PLL1RGE_3;
  RCC->PLLCFGR |= RCC_PLLCFGR_PLL3RGE_3;

 	//Za PLL1 trebam pomnožiti sa 69(70 zapravo) i podijeliti sa 2(default state)
  RCC->PLL1DIVR |= 69;

 	//Pomnozi sa 17(18 zapravo) i podijeli sa 15(zapravo 16) 8 * 18/7 = 9 MHz za lcd driver na display modulu
  RCC->PLL3DIVR |= 17;	//Množenje sa 18
  RCC->PLL3DIVR |= (15 << 24);	// Dijeljenje sa 16;

 	//Namjesti Prescalere za PLL1 APB3 bus da bude max outan tj. 140 MHz
  RCC->CDCFGR1 |= RCC_CDCFGR1_CDPPRE_2;	//sys_clk / 2 = 140 MHz

}

void LTDC_Peripheral_Init(void)
{
 	//Enable AHB peripheral I,J,K ports
  RCC->AHB4ENR |= RCC_AHB4ENR_GPIOIEN;	// LCD_CLK, LCD_HSYNC, LCD_VSYNC
  RCC->AHB4ENR |= RCC_AHB4ENR_GPIOJEN;	//
  RCC->AHB4ENR |= RCC_AHB4ENR_GPIOKEN;	// LCD_DE

 	//Enable all 24 pins as Alternate functions
  GPIOI->MODER &= ~(GPIO_MODER_MODE12_0);	//PIN 12, LCD_HSYNC
  GPIOI->MODER &= ~(GPIO_MODER_MODE13_0);	//PIN 13, LCD_VSYNC
  GPIOI->MODER &= ~(GPIO_MODER_MODE14_0);	//PIN 14, LCD_CLK
  GPIOI->MODER &= ~(GPIO_MODER_MODE15_0);	//PIN 15, R0

  GPIOJ->MODER &= ~(GPIO_MODER_MODE0_0);	//PIN 0,  R1
  GPIOJ->MODER &= ~(GPIO_MODER_MODE1_0);	//PIN 1,  R2
  GPIOJ->MODER &= ~(GPIO_MODER_MODE2_0);	//PIN 2   R3
  GPIOJ->MODER &= ~(GPIO_MODER_MODE3_0);	//PIN 3   R4
  GPIOJ->MODER &= ~(GPIO_MODER_MODE4_0);	//PIN 4   R5
  GPIOJ->MODER &= ~(GPIO_MODER_MODE5_0);	//PIN 5   R6
  GPIOJ->MODER &= ~(GPIO_MODER_MODE6_0);	//PIN 6   R7
  GPIOJ->MODER &= ~(GPIO_MODER_MODE7_0);	//PIN 7   G0
  GPIOJ->MODER &= ~(GPIO_MODER_MODE8_0);	//PIN 8   G1
  GPIOJ->MODER &= ~(GPIO_MODER_MODE9_0);	//PIN 9   G2
  GPIOJ->MODER &= ~(GPIO_MODER_MODE10_0);	//PIN 10  G3
  GPIOJ->MODER &= ~(GPIO_MODER_MODE11_0);	//PIN 11  G4
  GPIOJ->MODER &= ~(GPIO_MODER_MODE12_0);	//PIN 12  B0
  GPIOJ->MODER &= ~(GPIO_MODER_MODE13_0);	//PIN 13  B1
  GPIOJ->MODER &= ~(GPIO_MODER_MODE14_0);	//PIN 14  B2
  GPIOJ->MODER &= ~(GPIO_MODER_MODE15_0);	//PIN 15  B3

  GPIOK->MODER &= ~(GPIO_MODER_MODE0_0);	//PIN 0   G5
  GPIOK->MODER &= ~(GPIO_MODER_MODE1_0);	//PIN 1   G6
  GPIOK->MODER &= ~(GPIO_MODER_MODE2_0);	//PIN 2   G7
  GPIOK->MODER &= ~(GPIO_MODER_MODE3_0);	//PIN 3   B4
  GPIOK->MODER &= ~(GPIO_MODER_MODE4_0);	//PIN 4   B5
  GPIOK->MODER &= ~(GPIO_MODER_MODE5_0);	//PIN 5   B6
  GPIOK->MODER &= ~(GPIO_MODER_MODE6_0);	//PIN 6   B7
  GPIOK->MODER &= ~(GPIO_MODER_MODE7_0);	//PIN 7   LCD_DE

 	//Set peripherals to AF14 so it could be configured for LCD-TFT
  GPIOI->AFR[1] |= (14 << GPIO_AFRH_AFSEL12_Pos);
  GPIOI->AFR[1] |= (14 << GPIO_AFRH_AFSEL13_Pos);
  GPIOI->AFR[1] |= (14 << GPIO_AFRH_AFSEL14_Pos);
  GPIOI->AFR[1] |= (14 << GPIO_AFRH_AFSEL15_Pos);

  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL0_Pos);
  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL1_Pos);
  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL2_Pos);
  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL3_Pos);
  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL4_Pos);
  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL5_Pos);
  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL6_Pos);
  GPIOJ->AFR[0] |= (14 << GPIO_AFRL_AFSEL7_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL8_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL9_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL10_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL11_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL12_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL13_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL14_Pos);
  GPIOJ->AFR[1] |= (14 << GPIO_AFRH_AFSEL15_Pos);

  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL0_Pos);
  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL1_Pos);
  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL2_Pos);
  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL3_Pos);
  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL4_Pos);
  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL5_Pos);
  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL6_Pos);
  GPIOK->AFR[0] |= (14 << GPIO_AFRL_AFSEL7_Pos);

 	//Set every Pin to have Very high speed (OSPEEDR)
  GPIOI->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED12_Pos);
  GPIOI->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED13_Pos);
  GPIOI->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED14_Pos);
  GPIOI->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED15_Pos);

  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED0_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED1_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED2_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED3_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED4_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED5_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED6_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED7_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED8_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED9_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED10_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED11_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED12_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED13_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED14_Pos);
  GPIOJ->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED15_Pos);

  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED0_Pos);
  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED1_Pos);
  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED2_Pos);
  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED3_Pos);
  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED4_Pos);
  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED5_Pos);
  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED6_Pos);
  GPIOK->OSPEEDR |= (3 << GPIO_OSPEEDR_OSPEED7_Pos);

}

void LTDC_Peripheral_Setup(void)
{
 	//Set Hsync and Vsync in LTDC_SSCR
  LTDC->SSCR |= ((20 - 1) << LTDC_SSCR_VSH_Pos);	//Vsync
  LTDC->SSCR |= ((30 - 1) << LTDC_SSCR_HSW_Pos);	//Wsync

 	//Back porch configuration
  LTDC->BPCR |= ((20 + 12 - 1) << LTDC_BPCR_AVBP_Pos);	//Vsync + VBP
  LTDC->BPCR |= ((43 + 30 - 1) << LTDC_BPCR_AHBP_Pos);	//Hsync + HBP

 	//Active width and height configuration
  LTDC->AWCR |= ((20 + 12 + 272 - 1) << LTDC_AWCR_AAH_Pos);	//Active height
  LTDC->AWCR |= ((43 + 30 + 480 - 1) << LTDC_AWCR_AAW_Pos);	//Active weight

 	//Total width configuration
  LTDC->TWCR |= ((20 + 12 + 272 + 4 - 1) << LTDC_TWCR_TOTALH_Pos);	//Total height
  LTDC->TWCR |= ((43 + 30 + 480 + 8 - 1) << LTDC_TWCR_TOTALW_Pos);	//Total weight

 	//Configure color red

  LTDC->BCCR |= (0xFF UL << LTDC_BCCR_BCRED_Pos);

 	//Enable LTDC peripheral
  LTDC->GCR |= (1 << 0);
}

SofLit · ‎2024-02-29

Sorry I didn't understand what you copied? and why you copied it?

You need to have the all package and build the project (out of the box) from here: STM32Cube_FW_H7_VX.Y.0\Projects\STM32H7B3I-DK\Examples\LTDC\LTDC_Display_2Layers\STM32CubeIDE\

No need to copy or move any file!

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richi · ‎2024-03-01

I have tried to build a lot of examples , and every one of them has errors.

SofLit · ‎2024-03-01

Please re-download the package from here and build the project as it is .. There is no problems with the projects.

Also try to shorten the path to the projects from your drive root for example copy your STM32CubeH7 package directly under C: as Windows uses a path length limitation.

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Peter BENSCH · ‎2024-03-01

@richi The firmware library uses relative paths and expects .c/.h files to be located at a specific relative position. So you cannot simply copy an example from the firmware structure and expect everything to be compilable.

Have you tested the examples directly from the directory structure recommended by @SofLit , i.e. without copying them anywhere?

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richi · ‎2024-03-01

I did , they out of the box cannot be built because they throw errors that stm32h7xx.h is missing

Peter BENSCH · ‎2024-03-01

I can see from your screenshot that you are neither working in the unchanged directory structure nor using a short path as suggested by @SofLit. As long as you do not implement this, you will always have problems.

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richi · ‎2024-03-03

I must say that I dont understand what does it mean to "test the examples directly from the directory structure". I tried to go File >> Open Projects from File System choose the LTDC_2Layers directory , but then I am unable to build the project. If I go to LTDC_2Layers and click on the .project file it imports my project in Cube , I build it and the above picture is the result. I changed relative path in C: but error persists.

SofLit · ‎2024-03-04

Hello,

When CubeMx suggested you to download the H7 library did you do it?

You need to have the H7 cube package on this path <user>\STM32Cube\Repository\STM32Cube_FW_H7_VX.YY.ZZ

No need to import the project from File >> Open Projects . Simply open the project by clicking .project file.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.