Using BSP_LCD library from stm32746g_discovery board on stm32f767zit6 MCU

[nitish111]

Hi,

I am trying to learn TFT display with touch capabilities. I am using STM32F767ZIT6 MCU, RK043FN02H-CT TFT with capacitive touch panel and AS4C4M32SA SDRAM. I imported following library from STM32F746g discovery board.

#include "stm32746g_discovery.h"
#include "stm32746g_discovery_lcd.h"
#include "stm32746g_discovery_sdram.h"
#include "stm32746g_discovery_ts.h"

I corrected pin assignments on the files and uploaded software. I was able to turn on the LCD and initialize it. Then I could not make it display color. After few research I realize that I had FBStartAdress at 0 and then I changed to 0xC0000000. I could see flickers on the screen. Then I entered FBStartAdress = 0x20013dfc. I was getting full color. I was able to draw different shapes (circle,lines, ellipse etc) but when I displaying texts it would print properly on first two lines and then it would display randomly(refer link https://gph.is/2HRzsuP). Here is the code snippet I'm using.

#define LCD_FRAME_BUFFER_LAYER0 ((uint32_t)0x20013dfc)

BSP_LCD_Init();

BSP_LCD_LayerRgb565Init(0, LCD_FRAME_BUFFER_LAYER0);
BSP_LCD_SelectLayer(0);
BSP_LCD_SetLayerVisible(0, ENABLE);
BSP_LCD_Clear(LCD_COLOR_RED);

int dummy = 0;

while (1)
{

BSP_LCD_SetTextColor(LCD_COLOR_GREEN);
BSP_LCD_SetBackColor(LCD_COLOR_BLUE);
BSP_LCD_DisplayStringAtLine(dummy,(uint8_t*)"HELLO WORLD!!!");

HAL_Delay(500);
BSP_LCD_Clear(LCD_COLOR_RED);

dummy++;
if (dummy>=12) dummy =0;

}

I have set text color as green but it displays in yellow. I am not sure what is causing the glitch or why color is yellow instead of green. Please refer to stmcube32.png for pin assignment. Refer below for clock configuration.

void SystemClock_Config(void)
{

RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;

/**Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE();

__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 432;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

/**Activate the Over-Drive mode
*/
if (HAL_PWREx_EnableOverDrive() != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

/**Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC|RCC_PERIPHCLK_I2C4;
PeriphClkInitStruct.PLLSAI.PLLSAIN = 192;
PeriphClkInitStruct.PLLSAI.PLLSAIR = 5;
PeriphClkInitStruct.PLLSAI.PLLSAIQ = 2;
PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV2;
PeriphClkInitStruct.PLLSAIDivQ = 1;
PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_4;
PeriphClkInitStruct.I2c4ClockSelection = RCC_I2C4CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

/**Configure the Systick interrupt time
*/
HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

/**Configure the Systick
*/
HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

/* SysTick_IRQn interrupt configuration */
HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}