source: rtems/c/src/lib/libbsp/arm/atsam/libraries/libchip/include/usart.h @ e1eeb883

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/**
 * \file
 *
 * \par Purpose
 *
 * This module provides several definitions and methods for using an USART
 * peripheral.
 *
 * \par Usage
 *
 * -# Enable the USART peripheral clock in the PMC.
 * -# Enable the required USART PIOs (see pio.h).
 * -# Configure the UART by calling USART_Configure.
 * -# Enable the transmitter and/or the receiver of the USART using
 *    USART_SetTransmitterEnabled and USART_SetReceiverEnabled.
 * -# Send data through the USART using the USART_Write methods.
 * -# Receive data from the USART using the USART_Read functions; the
 * availability of data can be polled
 *    with USART_IsDataAvailable.
 * -# Disable the transmitter and/or the receiver of the USART with
 *    USART_SetTransmitterEnabled and USART_SetReceiverEnabled.
 */

#ifndef _USART_
#define _USART_

/*------------------------------------------------------------------------------
 *         Headers
 *----------------------------------------------------------------------------*/

#include "chip.h"

#include <stdint.h>

/*------------------------------------------------------------------------------
 *         Definitions
 *----------------------------------------------------------------------------*/

/** \section USART_mode USART modes
 * This section lists several common operating modes for an USART peripheral.
 *
 * \b Modes
 * - USART_MODE_ASYNCHRONOUS
 * - USART_MODE_IRDA
 */

/** Basic asynchronous mode, i.e. 8 bits no parity.*/
#define USART_MODE_ASYNCHRONOUS        (US_MR_CHRL_8_BIT | US_MR_PAR_NO)

#define MAX_RX_TIMEOUT          131071

/** IRDA mode*/
#define USART_MODE_IRDA \
        (US_MR_USART_MODE_IRDA | US_MR_CHRL_8_BIT | US_MR_PAR_NO | US_MR_FILTER)

/** SPI mode*/
#define AT91C_US_USMODE_SPIM     0xE
#define US_SPI_CPOL_0           (0x0<<16)
#define US_SPI_CPHA_0            (0x0<<8)
#define US_SPI_CPOL_1            (0x1<<16)
#define US_SPI_CPHA_1            (0x1<<8)
#define US_SPI_BPMODE_0    (US_SPI_CPOL_0|US_SPI_CPHA_1)
#define US_SPI_BPMODE_1    (US_SPI_CPOL_0|US_SPI_CPHA_0)
#define US_SPI_BPMODE_2    (US_SPI_CPOL_1|US_SPI_CPHA_1)
#define US_SPI_BPMODE_3    (US_SPI_CPOL_1|US_SPI_CPHA_0)

#ifdef __cplusplus
extern "C" {
#endif

/*------------------------------------------------------------------------------*/
/*         Exported functions                                                   */
/*------------------------------------------------------------------------------*/


void USART_Configure(Usart *pUsart, uint32_t mode, uint32_t baudrate,
                                          uint32_t masterClock);

void USART_SetBaudrate(Usart *pUsart,  uint8_t OverSamp, uint32_t baudrate,
                                           uint32_t masterClock);

uint32_t USART_GetStatus(Usart *usart);


void USART_ResetRx(Usart *pUsart);

void USART_ResetTx(Usart *pUsart);

void USART_EnableTx(Usart *pUsart);

void USART_EnableRx(Usart *pUsart);

void USART_DisableRx(Usart *pUsart);

void USART_DisableTx(Usart *pUsart);

void USART_EnableIt(Usart *usart, uint32_t mode);

void USART_DisableIt(Usart *usart, uint32_t mode);

uint32_t USART_GetItMask(Usart *usart);

void USART_SetTransmitterEnabled(Usart *usart, uint8_t enabled);

void USART_SetReceiverEnabled(Usart *usart, uint8_t enabled);

void USART_SetRTSEnabled(Usart *usart, uint8_t enabled);

void USART_Write(Usart *usart, uint16_t data, volatile uint32_t timeOut);

uint16_t USART_Read(Usart *usart, volatile uint32_t timeOut);

uint8_t USART_IsDataAvailable(Usart *usart);

void USART_SetIrdaFilter(Usart *pUsart, uint8_t filter);

void USART_PutChar(Usart *usart, uint8_t c);

uint32_t USART_IsRxReady(Usart *usart);

uint8_t USART_GetChar(Usart *usart);

void USART_EnableRecvTimeOut(Usart *usart, uint32_t timeout);

void USART_EnableTxTimeGaurd(Usart *pUsart, uint32_t TimeGaurd);

void USART_AcknowledgeRxTimeOut(Usart *usart, uint8_t Periodic);


#ifdef __cplusplus
}
#endif

#endif /* #ifndef _USART_ */