/***************************************************************************//**
* @brief
* Reset USART/UART to same state as after a HW reset.
*
* @param[in] usart
* Pointer to USART/UART peripheral register block.
******************************************************************************/
void USART_Reset(USART_TypeDef *usart)
{
/* Make sure the module exists on the selected chip */
EFM_ASSERT(USART_REF_VALID(usart) || UART_REF_VALID(usart));
/* Make sure disabled first, before resetting other registers */
usart->CMD = USART_CMD_RXDIS | USART_CMD_TXDIS | USART_CMD_MASTERDIS |
USART_CMD_RXBLOCKDIS | USART_CMD_TXTRIDIS | USART_CMD_CLEARTX | USART_CMD_CLEARRX;
usart->CTRL = _USART_CTRL_RESETVALUE;
usart->FRAME = _USART_FRAME_RESETVALUE;
usart->TRIGCTRL = _USART_TRIGCTRL_RESETVALUE;
usart->CLKDIV = _USART_CLKDIV_RESETVALUE;
usart->IEN = _USART_IEN_RESETVALUE;
usart->IFC = _USART_IFC_MASK;
usart->ROUTE = _USART_ROUTE_RESETVALUE;
if (USART_IRDA_VALID(usart))
{
usart->IRCTRL = _USART_IRCTRL_RESETVALUE;
}
#if defined(_USART_INPUT_RESETVALUE)
usart->INPUT = _USART_INPUT_RESETVALUE;
#endif
#if defined(_USART_I2SCTRL_RESETVALUE)
if (USART_I2S_VALID(usart))
{
usart->I2SCTRL = _USART_I2SCTRL_RESETVALUE;
}
#endif
}
/***************************************************************************//**
* @brief
* Init USART for asynchronous IrDA mode.
*
* @details
* This function will configure basic settings in order to operate in
* asynchronous IrDA mode.
*
* Special control setup not covered by this function must be done after
* using this function by direct modification of the CTRL and IRCTRL
* registers.
*
* Notice that pins used by the USART/UART module must be properly configured
* by the user explicitly, in order for the USART/UART to work as intended.
* (When configuring pins, one should remember to consider the sequence of
* configuration, in order to avoid unintended pulses/glitches on output
* pins.)
*
* @param[in] usart
* Pointer to USART peripheral register block.
*
* @param[in] init
* Pointer to initialization structure used to configure async IrDA setup.
*
* @note
* Not all USART instances support IrDA. See the datasheet for your device.
*
******************************************************************************/
void USARTn_InitIrDA(USART_TypeDef *usart, const USART_InitIrDA_TypeDef *init)
{
EFM_ASSERT(USART_IRDA_VALID(usart));
/* Init USART as async device */
USART_InitAsync(usart, &(init->async));
/* Set IrDA modulation to RZI (return-to-zero-inverted) */
usart->CTRL |= USART_CTRL_TXINV;
/* Invert Rx signal before demodulator if enabled */
if (init->irRxInv)
{
usart->CTRL |= USART_CTRL_RXINV;
}
/* Configure IrDA */
usart->IRCTRL |= (uint32_t)init->irPw
| (uint32_t)init->irPrsSel
| ((uint32_t)init->irFilt << _USART_IRCTRL_IRFILT_SHIFT)
| ((uint32_t)init->irPrsEn << _USART_IRCTRL_IRPRSEN_SHIFT);
/* Enable IrDA */
usart->IRCTRL |= USART_IRCTRL_IREN;
}