/* ---------------------------------------------------------------------------- */
/* Atmel Microcontroller Software Support */
/* SAM Software Package License */
/* ---------------------------------------------------------------------------- */
/* Copyright (c) 2015, Atmel Corporation */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following condition is met: */
/* */
/* - Redistributions of source code must retain the above copyright notice, */
/* this list of conditions and the disclaimer below. */
/* */
/* Atmel's name may not be used to endorse or promote products derived from */
/* this software without specific prior written permission. */
/* */
/* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR */
/* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */
/* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, */
/* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */
/* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */
/* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */
/* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* ---------------------------------------------------------------------------- */
/**
* \file
*
* Implementation of UART (Universal Asynchronous Receiver Transmitter)
* controller.
*
*/
/*------------------------------------------------------------------------------
* Headers
*----------------------------------------------------------------------------*/
#include "chip.h"
#include <assert.h>
#include <string.h>
/*------------------------------------------------------------------------------
* Exported functions
*----------------------------------------------------------------------------*/
/**
* \brief Configures an UART peripheral with the specified parameters.
*
*
* \param uart Pointer to the UART peripheral to configure.
* \param mode Desired value for the UART mode register (see the datasheet).
* \param baudrate Baudrate at which the UART should operate (in Hz).
* \param masterClock Frequency of the system master clock (in Hz).
*/
void UART_Configure(Uart *uart,
uint32_t mode,
uint32_t baudrate,
uint32_t masterClock)
{
/* Reset and disable receiver & transmitter*/
uart->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX
| UART_CR_RXDIS | UART_CR_TXDIS | UART_CR_RSTSTA;
uart->UART_IDR = 0xFFFFFFFF;
/* Configure mode*/
uart->UART_MR = mode;
/* Configure baudrate*/
uart->UART_BRGR = (masterClock / baudrate) / 16;
uart->UART_CR = UART_CR_TXEN | UART_CR_RXEN;
}
/**
* \brief Enables or disables the transmitter of an UART peripheral.
*
*
* \param uart Pointer to an UART peripheral
* \param enabled If true, the transmitter is enabled; otherwise it is
* disabled.
*/
void UART_SetTransmitterEnabled(Uart *uart, uint8_t enabled)
{
if (enabled)
uart->UART_CR = UART_CR_TXEN;
else
uart->UART_CR = UART_CR_TXDIS;
}
/**
* \brief Enables or disables the receiver of an UART peripheral
*
*
* \param uart Pointer to an UART peripheral
* \param enabled If true, the receiver is enabled; otherwise it is disabled.
*/
void UART_SetReceiverEnabled(Uart *uart, uint8_t enabled)
{
if (enabled)
uart->UART_CR = UART_CR_RXEN;
else
uart->UART_CR = UART_CR_RXDIS;
}
/**
* \brief Return 1 if a character can be read in UART
* \param uart Pointer to an UART peripheral.
*/
uint32_t UART_IsRxReady(Uart *uart)
{
return (uart->UART_SR & UART_SR_RXRDY);
}
/**
* \brief Reads and returns a character from the UART.
*
* \note This function is synchronous (i.e. uses polling).
* \param uart Pointer to an UART peripheral.
* \return Character received.
*/
uint8_t UART_GetChar(Uart *uart)
{
while (!UART_IsRxReady(uart));
return uart->UART_RHR;
}
/**
* \brief Return 1 if a character can be send to UART
* \param uart Pointer to an UART peripheral.
*/
uint32_t UART_IsTxReady(Uart *uart)
{
return (uart->UART_SR & UART_SR_TXRDY);
}
/**
* \brief Return 1 if a character can be send to UART
* \param uart Pointer to an UART peripheral.
*/
static uint32_t UART_IsTxSent(Uart *uart)
{
return (uart->UART_SR & UART_SR_TXEMPTY);
}
/**
* \brief Sends one packet of data through the specified UART peripheral. This
* function operates synchronously, so it only returns when the data has been
* actually sent.
*
* \param uart Pointer to an UART peripheral.
* \param c Character to send
*/
void UART_PutChar(Uart *uart, uint8_t c)
{
/* Wait for the transmitter to be ready*/
while (!UART_IsRxReady(uart) && !UART_IsTxSent(uart));
/* Send character*/
uart->UART_THR = c;
/* Wait for the transfer to complete*/
while (!UART_IsTxSent(uart));
}
/**
* \brief Get present status
* \param uart Pointer to an UART peripheral.
*/
uint32_t UART_GetStatus(Uart *uart)
{
return uart->UART_SR;
}
/**
* \brief Enable interrupt
* \param uart Pointer to an UART peripheral.
* \param mode Interrupt mode.
*/
void UART_EnableIt(Uart *uart, uint32_t mode)
{
uart->UART_IER = mode;
}
/**
* \brief Disable interrupt
* \param uart Pointer to an UART peripheral.
* \param mode Interrupt mode.
*/
void UART_DisableIt(Uart *uart, uint32_t mode)
{
uart->UART_IDR = mode;
}
/**
* \brief Return interrupt mask
* \param uart Pointer to an UART peripheral.
*/
uint32_t UART_GetItMask(Uart *uart)
{
return uart->UART_IMR;
}
void UART_SendBuffer(Uart *uart, uint8_t *pBuffer, uint32_t BuffLen)
{
uint8_t *pData = pBuffer;
uint32_t Len = 0;
for (Len = 0; Len < BuffLen; Len++) {
UART_PutChar(uart, *pData);
pData++;
}
}
void UART_ReceiveBuffer(Uart *uart, uint8_t *pBuffer, uint32_t BuffLen)
{
uint32_t Len = 0;
for (Len = 0; Len < BuffLen; Len++) {
*pBuffer = UART_GetChar(uart);
pBuffer++;
}
}
void UART_CompareConfig(Uart *uart, uint8_t Val1, uint8_t Val2)
{
uart->UART_CMPR = (UART_CMPR_VAL1(Val1) | UART_CMPR_VAL2(Val2));
}
