SPI2 with LL lib run abnormal in STM32L431

[zfz1120]

Caution HARDWARE:STM32L431RC CubeL4 version :STM32L4 Series 1.15.0 SPI2：to drive st7789 // /*SPI2 GPIO Configuration
// PC3 ------> SPI2_MOSI // PB13 ------> SPI2_SCK // /

when use LL lib to init PB13 as sck，my board sometimes works abnormal; if i chooss HAL lib(as commit below) to init PB13, it‘s OK.

`static void MX_SPI2_Init(void) {

/ USER CODE BEGIN SPI2_Init 0 /

/ USER CODE END SPI2_Init 0 / LL_SPI_InitTypeDef SPI_InitStruct = {0};

/ Peripheral clock enable / LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_SPI2);

LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC); LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);

LL_GPIO_InitTypeDef GPIO_InitStruct = {0}; GPIO_InitStruct.Pin = LL_GPIO_PIN_3; GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE; GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL; GPIO_InitStruct.Pull = LL_GPIO_PULL_NO; GPIO_InitStruct.Alternate = LL_GPIO_AF_5; LL_GPIO_Init(GPIOC, &GPIO_InitStruct);

GPIO_InitStruct.Pin = LL_GPIO_PIN_13; GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE; GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL; GPIO_InitStruct.Pull = LL_GPIO_PULL_NO; GPIO_InitStruct.Alternate = LL_GPIO_AF_5; LL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/this works ok / // __HAL_RCC_GPIOC_CLK_ENABLE(); // GPIO_InitTypeDef GPIO_InitStruct1; // GPIO_InitStruct1.Pin = GPIO_PIN_13; // GPIO_InitStruct1.Mode = GPIO_MODE_AF_PP; // GPIO_InitStruct1.Pull = GPIO_NOPULL; // GPIO_InitStruct1.Speed = GPIO_SPEED_FREQ_VERY_HIGH; // GPIO_InitStruct1.Alternate = GPIO_AF5_SPI2; // HAL_GPIO_Init(GPIOB, &GPIO_InitStruct1);

SPI_InitStruct.TransferDirection = LL_SPI_FULL_DUPLEX; SPI_InitStruct.Mode = LL_SPI_MODE_MASTER; SPI_InitStruct.DataWidth = LL_SPI_DATAWIDTH_8BIT; SPI_InitStruct.ClockPolarity = LL_SPI_POLARITY_HIGH; SPI_InitStruct.ClockPhase = LL_SPI_PHASE_2EDGE; SPI_InitStruct.NSS = LL_SPI_NSS_SOFT; SPI_InitStruct.BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV2; SPI_InitStruct.BitOrder = LL_SPI_MSB_FIRST; SPI_InitStruct.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE; SPI_InitStruct.CRCPoly = 7;
if (LL_SPI_Init(SPI2, &SPI_InitStruct) != SUCCESS) { HardFault_Handler(); }

LL_SPI_SetStandard(SPI2, LL_SPI_PROTOCOL_MOTOROLA); LL_SPI_EnableNSSPulseMgt(SPI2); LL_SPI_Enable(SPI2);

}

[ASELSTM]

Hi @zfz1120,

Thank you for this report. In order to get a better understand of your issue, we need more clarifications :

1. Could you please provide us with more details about the abnormal behavior observed on your board.

2. Would you try to change the SPI2_SCK pin configuration as following and check whether you still have the same behavior :

  LL_GPIO_SetPinMode(GPIOB, LL_GPIO_PIN_13, LL_GPIO_MODE_ALTERNATE);
  LL_GPIO_SetAFPin_8_15(GPIOB, LL_GPIO_PIN_13, LL_GPIO_AF_5);
  LL_GPIO_SetPinSpeed(GPIOB, LL_GPIO_PIN_13, LL_GPIO_SPEED_FREQ_HIGH);
  LL_GPIO_SetPinPull(GPIOB, LL_GPIO_PIN_13, LL_GPIO_PULL_DOWN);

With regards,

[ASELSTM]

Hi @zfz1120,

Any feedback?

Thank you,

[ASELSTM]

Hi @zfz1120,

Thank you once more for your contribution. However, without more details we won't be able to investigate this issue further. So, please allow me to close this thread as no activity has been registered since a month. You can reopen it at any time if you have details to provide us to help you solve this issue. Thank you for your comprehension.

With regards,