[syntax=c]/* This file has been prepared for Doxygen automatic documentation generation.*/
/*! \file *********************************************************************
*
* \brief
* XMEGA USART driver source file.
*
* This file contains the function implementations the XMEGA interrupt
* and polled USART driver.
*
* The driver is not intended for size and/or speed critical code, since
* most functions are just a few lines of code, and the function call
* overhead would decrease code performance. The driver is intended for
* rapid prototyping and documentation purposes for getting started with
* the XMEGA ADC module.
*
* For size and/or speed critical code, it is recommended to copy the
* function contents directly into your application instead of making
* a function call.
*
* Some functions use the following construct:
* "some_register = ... | (some_parameter ? SOME_BIT_bm : 0) | ..."
* Although the use of the ternary operator ( if ? then : else ) is discouraged,
* in some occasions the operator makes it possible to write pretty clean and
* neat code. In this driver, the construct is used to set or not set a
* configuration bit based on a boolean input parameter, such as
* the "some_parameter" in the example above.
*
* \par Application note:
* AVR1307: Using the XMEGA USART
*
* \par Documentation
* For comprehensive code documentation, supported compilers, compiler
* settings and supported devices see readme.html
*
* \author
* Atmel Corporation: http://www.atmel.com \n
* Support email: avr@atmel.com
*
* $Revision: 1694 $
* $Date: 2008-07-29 14:21:58 +0200 (ti, 29 jul 2008) $ \n
*
* Copyright (c) 2008, Atmel Corporation All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name of ATMEL may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
* SPECIFICALLY 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.
*****************************************************************************/
#include "usart_driver.h"
/*! \brief Initializes buffer and selects what USART module to use.
*
* Initializes receive and transmit buffer and selects what USART module to use,
* and stores the data register empty interrupt level.
*
* \param usart_data The USART_data_t struct instance.
* \param usart The USART module.
* \param dreIntLevel Data register empty interrupt level.
*/
void USART_InterruptDriver_Initialize(USART_data_t * usart_data,
USART_t * usart,
USART_DREINTLVL_t dreIntLevel)
{
usart_data->usart = usart;
usart_data->dreIntLevel = dreIntLevel;
usart_data->buffer.RX_Tail = 0;
usart_data->buffer.RX_Head = 0;
usart_data->buffer.TX_Tail = 0;
usart_data->buffer.TX_Head = 0;
}
/*! \brief Set USART DRE interrupt level.
*
* Set the interrupt level on Data Register interrupt.
*
* \note Changing the DRE interrupt level in the interrupt driver while it is
* running will not change the DRE interrupt level in the USART before the
* DRE interrupt have been disabled and enabled again.
*
* \param usart_data The USART_data_t struct instance
* \param dreIntLevel Interrupt level of the DRE interrupt.
*/
void USART_InterruptDriver_DreInterruptLevel_Set(USART_data_t * usart_data,
USART_DREINTLVL_t dreIntLevel)
{
usart_data->dreIntLevel = dreIntLevel;
}
/*! \brief Test if there is data in the transmitter software buffer.
*
* This function can be used to test if there is free space in the transmitter
* software buffer.
*
* \param usart_data The USART_data_t struct instance.
*
* \retval true There is data in the receive buffer.
* \retval false The receive buffer is empty.
*/
bool USART_TXBuffer_FreeSpace(USART_data_t * usart_data)
{
/* Make copies to make sure that volatile access is specified. */
uint8_t tempHead = (usart_data->buffer.TX_Head + 1) & USART_TX_BUFFER_MASK;
uint8_t tempTail = usart_data->buffer.TX_Tail;
/* There are data left in the buffer unless Head and Tail are equal. */
return (tempHead != tempTail);
}
/*! \brief Put data (5-8 bit character).
*
* Stores data byte in TX software buffer and enables DRE interrupt if there
* is free space in the TX software buffer.
*
* \param usart_data The USART_data_t struct instance.
* \param data The data to send.
*/
bool USART_TXBuffer_PutByte(USART_data_t * usart_data, uint8_t data)
{
uint8_t tempCTRLA;
uint8_t tempTX_Head;
bool TXBuffer_FreeSpace;
USART_Buffer_t * TXbufPtr;
TXbufPtr = &usart_data->buffer;
TXBuffer_FreeSpace = USART_TXBuffer_FreeSpace(usart_data);
if(TXBuffer_FreeSpace)
{
tempTX_Head = TXbufPtr->TX_Head;
TXbufPtr->TX[tempTX_Head]= data;
/* Advance buffer head. */
TXbufPtr->TX_Head = (tempTX_Head + 1) & USART_TX_BUFFER_MASK;
/* Enable DRE interrupt. */
tempCTRLA = usart_data->usart->CTRLA;
tempCTRLA = (tempCTRLA & ~USART_DREINTLVL_gm) | usart_data->dreIntLevel;
usart_data->usart->CTRLA = tempCTRLA;
}
return TXBuffer_FreeSpace;
}
/*! \brief Test if there is data in the receive software buffer.
*
* This function can be used to test if there is data in the receive software
* buffer.
*
* \param usart_data The USART_data_t struct instance
*
* \retval true There is data in the receive buffer.
* \retval false The receive buffer is empty.
*/
bool USART_RXBufferData_Available(USART_data_t * usart_data)
{
/* Make copies to make sure that volatile access is specified. */
uint8_t tempHead = usart_data->buffer.RX_Head;
uint8_t tempTail = usart_data->buffer.RX_Tail;
/* There are data left in the buffer unless Head and Tail are equal. */
return (tempHead != tempTail);
}
/*! \brief Get received data (5-8 bit character).
*
* The function USART_RXBufferData_Available should be used before this
* function is used to ensure that data is available.
*
* Returns data from RX software buffer.
*
* \param usart_data The USART_data_t struct instance.
*
* \return Received data.
*/
uint8_t USART_RXBuffer_GetByte(USART_data_t * usart_data)
{
USART_Buffer_t * bufPtr;
uint8_t ans;
bufPtr = &usart_data->buffer;
ans = (bufPtr->RX[bufPtr->RX_Tail]);
/* Advance buffer tail. */
bufPtr->RX_Tail = (bufPtr->RX_Tail + 1) & USART_RX_BUFFER_MASK;
return ans;
}
/*! \brief RX Complete Interrupt Service Routine.
*
* RX Complete Interrupt Service Routine.
* Stores received data in RX software buffer.
*
* \param usart_data The USART_data_t struct instance.
*/
bool USART_RXComplete(USART_data_t * usart_data)
{
USART_Buffer_t * bufPtr;
bool ans;
bufPtr = &usart_data->buffer;
/* Advance buffer head. */
uint8_t tempRX_Head = (bufPtr->RX_Head + 1) & USART_RX_BUFFER_MASK;
/* Check for overflow. */
uint8_t tempRX_Tail = bufPtr->RX_Tail;
uint8_t data = usart_data->usart->DATA;
if (tempRX_Head == tempRX_Tail) {
ans = false;
}else{
ans = true;
usart_data->buffer.RX[usart_data->buffer.RX_Head] = data;
usart_data->buffer.RX_Head = tempRX_Head;
}
return ans;
}
/*! \brief Data Register Empty Interrupt Service Routine.
*
* Data Register Empty Interrupt Service Routine.
* Transmits one byte from TX software buffer. Disables DRE interrupt if buffer
* is empty. Argument is pointer to USART (USART_data_t).
*
* \param usart_data The USART_data_t struct instance.
*/
void USART_DataRegEmpty(USART_data_t * usart_data)
{
USART_Buffer_t * bufPtr;
bufPtr = &usart_data->buffer;
/* Check if all data is transmitted. */
uint8_t tempTX_Tail = usart_data->buffer.TX_Tail;
if (bufPtr->TX_Head == tempTX_Tail){
/* Disable DRE interrupts. */
uint8_t tempCTRLA = usart_data->usart->CTRLA;
tempCTRLA = (tempCTRLA & ~USART_DREINTLVL_gm) | USART_DREINTLVL_OFF_gc;
usart_data->usart->CTRLA = tempCTRLA;
}else{
/* Start transmitting. */
uint8_t data = bufPtr->TX[usart_data->buffer.TX_Tail];
usart_data->usart->DATA = data;
/* Advance buffer tail. */
bufPtr->TX_Tail = (bufPtr->TX_Tail + 1) & USART_TX_BUFFER_MASK;
}
}
/*! \brief Put data (9 bit character).
*
* Use the function USART_IsTXDataRegisterEmpty before using this function to
* put 9 bit character to the TX register.
*
* \param usart The USART module.
* \param data The data to send.
*/
void USART_NineBits_PutChar(USART_t * usart, uint16_t data)
{
if(data & 0x0100) {
usart->CTRLB |= USART_TXB8_bm;
}else {
usart->CTRLB &= ~USART_TXB8_bm;
}
usart->DATA = (data & 0x00FF);
}
/*! \brief Get received data (9 bit character).
*
* This function reads out the received 9 bit character (uint16_t).
* Use the function USART_IsRXComplete to check if anything is received.
*
* \param usart The USART module.
*
* \retval Received data.
*/
uint16_t USART_NineBits_GetChar(USART_t * usart)
{
if(usart->CTRLB & USART_RXB8_bm) {
return(0x0100 | usart->DATA);
}else {
return(usart->DATA);
}
}
bool USART_TXBuffer_PutString(USART_data_t * usart_data, const char* str)
{
while(*str != 0)
{
USART_TXBuffer_PutByte( usart_data, (uint8_t)*str );
str++;
}
return true;
}[/syntax]
[syntax=c]void USART_init()
{
PORTC_OUTSET=PIN3_bm;
PORTC_DIRSET=PIN3_bm; //Pin TxD musi być wyjściem
USART_InterruptDriver_Initialize(&USART_data, &USART, USART_DREINTLVL_LO_gc);
/* USARTC0, 8 Data bits, No Parity, 1 Stop bit. */
USART_Format_Set(USART_data.usart, USART_CHSIZE_8BIT_gc,
USART_PMODE_DISABLED_gc, false);
/* Enable RXC interrupt. */
USART_RxdInterruptLevel_Set(USART_data.usart, USART_RXCINTLVL_LO_gc);
/* Set Baudrate to 9600 bps:
* Use the default I/O clock frequency that is 2 MHz.
* Do not use the baudrate scale factor
*
* Baudrate select = (1/(16*(((I/O clock frequency)/Baudrate)-1)
* = 12
*/
USART_Baudrate_Set(&USART, 150 , -7);
/* Enable both RX and TX. */
USART_Rx_Enable(USART_data.usart);
USART_Tx_Enable(USART_data.usart);
/* Enable PMIC interrupt level low. */
PMIC.CTRL |= PMIC_LOLVLEX_bm;
}
ISR(USARTC0_RXC_vect)
{
USART_RXComplete(&USART_data);
}
ISR(USARTC0_DRE_vect)
{
USART_DataRegEmpty(&USART_data);
}[/syntax]
Po wysłaniu zwykłej instrukcji:
[syntax=c]for(int g=0;g<20;g++)
USART_TXBuffer_PutByte(&USART_data,'i');
break;[/syntax]
na terminalu pojawia się tylko 10 znaków i zamiast 20. Co jest nie tak?Statystyki: Napisane przez norbert22 — 1 sty 2015, o 16:26
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