FATFS not working with BSP_LCD functions (stm32469i_discovery_lcd.h) on stm32f469i-Discovery

[DerFreaker]

Hi everyone,

I'm currently working on developing an audio player with a display interface on the STM32F469I-Discovery board. I've got both the audio and the display working on their own. However, when I try to use both at the same time, I get an FR_DISK_ERR on f_lseek in audioplayer.c at line 42.

I thought I'd give you a quick overview of my setup:

Audio Codec = CS43L22
Display = Integrated LCD

What I've Tried:
Audio Playback: It works perfectly when the display is not in use.
Display Interface: It functions correctly when audio playback is not active.
Simultaneous Operation: I get an FR_DISK_ERR during f_lseek operation in the audio player code.

Error Details:
File: audioplayer.c
Line: 42
Function: f_lseek

The code is provided in a zipped file in the appendix below.

Thank you very much :D 

[DerFreaker · Accepted solution]

Sooo... after a few hours of debugging I finally managed to find the problem.

So in file stm32469i_discovery_lcd.c on line 342

  hltdc_eval.LayerCfg->ImageWidth  = lcd_x_size;
  hltdc_eval.LayerCfg->ImageHeight = lcd_y_size;
  /* LCD clock configuration */
  /* PLLSAI_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
  /* PLLSAI_VCO Output = PLLSAI_VCO Input * PLLSAIN = 384 Mhz */
  /* PLLLCDCLK = PLLSAI_VCO Output/PLLSAIR = 384 MHz / 7 = 54.857 MHz */
  /* LTDC clock frequency = PLLLCDCLK / LTDC_PLLSAI_DIVR_2 = 54.857 MHz / 2 = 27.429 MHz */
  //PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC;
  PeriphClkInitStruct.PLLSAI.PLLSAIN = 384;
  PeriphClkInitStruct.PLLSAI.PLLSAIR = 7;
  PeriphClkInitStruct.PLLSAIDivR = RCC_PLLSAIDIVR_2;
  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);

Just comment this FUCxxx and never touch it again :D

//PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LTDC;

I hope I can help someone with this, if so please let me know lol.