SMARTCARD Extended private Functions

Functions
static void	SMARTCARDEx_SetNbDataToProcess (SMARTCARD_HandleTypeDef *hsmartcard)
	Calculate the number of data to process in RX/TX ISR. More...

Detailed Description

Function Documentation

SMARTCARDEx_SetNbDataToProcess()

static void SMARTCARDEx_SetNbDataToProcess ( SMARTCARD_HandleTypeDef *  hsmartcard )

static

Calculate the number of data to process in RX/TX ISR.

Note

The RX FIFO depth and the TX FIFO depth is extracted from the USART configuration registers.

Parameters

hsmartcard

SMARTCARD handle.

Return values

None

Definition at line 454 of file stm32l4xx_hal_smartcard_ex.c.

{
  uint8_t rx_fifo_depth;
  uint8_t tx_fifo_depth;
  uint8_t rx_fifo_threshold;
  uint8_t tx_fifo_threshold;
  /* 2 0U/1U added for MISRAC2012-Rule-18.1_b and MISRAC2012-Rule-18.1_d */
  uint8_t numerator[]   = {1U, 1U, 1U, 3U, 7U, 1U, 0U, 0U};
  uint8_t denominator[] = {8U, 4U, 2U, 4U, 8U, 1U, 1U, 1U};

  if (hsmartcard->FifoMode == SMARTCARD_FIFOMODE_DISABLE)
  {
    hsmartcard->NbTxDataToProcess = 1U;
    hsmartcard->NbRxDataToProcess = 1U;
  }
  else
  {
    rx_fifo_depth = RX_FIFO_DEPTH;
    tx_fifo_depth = TX_FIFO_DEPTH;
    rx_fifo_threshold = (uint8_t)(READ_BIT(hsmartcard->Instance->CR3, USART_CR3_RXFTCFG) >> USART_CR3_RXFTCFG_Pos);
    tx_fifo_threshold = (uint8_t)(READ_BIT(hsmartcard->Instance->CR3, USART_CR3_TXFTCFG) >> USART_CR3_TXFTCFG_Pos);
    hsmartcard->NbTxDataToProcess = ((uint16_t)tx_fifo_depth * numerator[tx_fifo_threshold]) / (uint16_t)denominator[tx_fifo_threshold];
    hsmartcard->NbRxDataToProcess = ((uint16_t)rx_fifo_depth * numerator[rx_fifo_threshold]) / (uint16_t)denominator[rx_fifo_threshold];
  }
}