HAL_DSI_Init() stuck on error. What error code? And what clock setting?

Ricko · ‎2025-03-08

Hi,

the application gets stuck on the Error_Handler() in the piece of code below in main.c

  hdsi.Instance = DSI;
  hdsi.Init.AutomaticClockLaneControl = DSI_AUTO_CLK_LANE_CTRL_DISABLE;
  hdsi.Init.TXEscapeCkdiv = 4;
  hdsi.Init.NumberOfLanes = DSI_TWO_DATA_LANES;
  hdsi.Init.PHYFrequencyRange = DSI_DPHY_FRANGE_80MHZ_100MHZ;
  hdsi.Init.PHYLowPowerOffset = PHY_LP_OFFSSET_0_CLKP;
  PLLInit.PLLNDIV = 32;
  PLLInit.PLLIDF = DSI_PLL_IN_DIV1;
  PLLInit.PLLODF = DSI_PLL_OUT_DIV2;
  PLLInit.PLLVCORange = DSI_DPHY_VCO_FRANGE_500MHZ_800MHZ;
  PLLInit.PLLChargePump = DSI_PLL_CHARGE_PUMP_2000HZ_4400HZ;
  PLLInit.PLLTuning = DSI_PLL_LOOP_FILTER_2000HZ_4400HZ;
  if (HAL_DSI_Init(&hdsi, &PLLInit) != HAL_OK)
  {
    Error_Handler();
  }

I just noticed that DSI lane clock is set to 32MHz - screenshot below - from the HSE (8MHz crystal). Obviously that is too low.

1. is that the reason for the error?

2. to what frequency (in the clock diagram page) do I set the two DSI clocks (DSI TXCLKESC and DSI lane byte clock)? Where in CubeMX do I get that value from?

2. there is no return value for the function xx so in debug mode there I cannot check the return value by hovering the mouse pointer over it. How can I see the return value of that function so I can see what the error code is?

Attached is the .IOC file with the current DSI settings if it helps.

Thank you :)

Rick