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osd-contiki/cpu/pic32/lib/pic32_uart.c

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added support for pic32 (PIC32MX795F512L)
2012-12-17 09:14:23 +01:00
/*
* Contiki PIC32 Port project
*
* Copyright (c) 2012,
* Scuola Superiore Sant'Anna (http://www.sssup.it) and
* Consorzio Nazionale Interuniversitario per le Telecomunicazioni
* (http://www.cnit.it).
*
* 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. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS 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.
*
*/
/**
* \addtogroup pic32 PIC32 Contiki Port
*
* @{
*/
/**
* \file pic32_uart.c
* \brief UART Interface for PIC32MX (pic32mx795f512l)
* \author Giovanni Pellerano <giovanni.pellerano@evilaliv3.org>
* \date 2012-03-21
*/
/*
* PIC32MX795F512L - Specific Functions
*
* All the functions in this part of the file are specific for the
* pic32mx795f512l that is characterized by registers' name that differ from
* the 3xx and 4xx families of the pic32mx.
*/
#define __UART_CODE_TEST__ 0
#if __UART_CODE_TEST__
#define __USE_UART__ 1
#define __USE_UART_PORT1A__ 1
#define __USE_UART_PORT1B__ 1
#define __USE_UART_PORT2A__ 1
#define __USE_UART_PORT2B__ 1
#define __USE_UART_PORT3A__ 1
#define __USE_UART_PORT3B__ 1
#endif /* __UART_CODE_TEST__ */
#ifdef __USE_UART__
#include <pic32_uart.h>
#include <pic32_clock.h>
#include <pic32_irq.h>
#include <p32xxxx.h>
#include "contiki.h"
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#include "dev/leds.h"
added support for pic32 (PIC32MX795F512L)
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/*---------------------------------------------------------------------------*/
#define UART_PORT_INIT_XA(XX, YY, ZZ) \
int8_t \
pic32_uart##XX##A_init(uint32_t baudrate, uint16_t byte_format) \
{ \
/* Disable Interrupts: RX, TX, ERR */ \
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IEC##ZZ##CLR = _IEC##ZZ##_U##XX##AEIE_MASK | _IEC##ZZ##_U##XX##ATXIE_MASK | _IEC##ZZ##_U##XX##ARXIE_MASK; \
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IFS##ZZ##CLR = _IFS##ZZ##_U##XX##AEIF_MASK | _IFS##ZZ##_U##XX##ATXIF_MASK | _IFS##ZZ##_U##XX##ARXIF_MASK; \
\
/* Clear thant Set Pri and Sub priority */ \
IPC##YY##CLR = _IPC##YY##_U##XX##AIP_MASK | _IPC##YY##_U##XX##AIS_MASK; \
IPC##YY##SET = (6 << _IPC##YY##_U##XX##AIP_POSITION) | (0 << _IPC##YY##_U##XX##AIS_POSITION); \
\
/* Mode Register Reset (this also stops UART) */ \
U##XX##AMODE = 0; \
\
/* Use BRGH = 1: 4 divisor */ \
U##XX##AMODESET = _U##XX##AMODE_BRGH_MASK; \
U##XX##ABRG = pic32_clock_calculate_brg(4, baudrate); \
\
U##XX##AMODESET = byte_format & 0x07; /* Number of bit, Parity and Stop bits */ \
\
/* Status bits */ \
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U##XX##ASTA = 0; \
U##XX##ASTASET = _U##XX##ASTA_URXEN_MASK | _U##XX##ASTA_UTXEN_MASK; /* Enable RX and TX */ \
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\
IEC##ZZ##SET = _IEC##ZZ##_U##XX##ARXIE_MASK; \
\
/* Enable UART port */ \
U##XX##AMODESET = _U##XX##AMODE_UARTEN_MASK; \
\
return UART_NO_ERROR; \
}
/*---------------------------------------------------------------------------*/
#define UART_PORT_INIT_XB(XX, YY, ZZ) \
int8_t \
pic32_uart##XX##B_init(uint32_t baudrate, uint16_t byte_format) \
{ \
/* Disable Interrupts: RX, TX, ERR */ \
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IEC##ZZ##CLR = _IEC##ZZ##_U##XX##BEIE_MASK | _IEC##ZZ##_U##XX##BTXIE_MASK | _IEC##ZZ##_U##XX##BRXIE_MASK; \
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IFS##ZZ##CLR = _IFS##ZZ##_U##XX##BEIF_MASK | _IFS##ZZ##_U##XX##BTXIF_MASK | _IFS##ZZ##_U##XX##BRXIF_MASK; \
\
/* Clear thant Set Pri and Sub priority */ \
IPC##YY##CLR = _IPC##YY##_U##XX##BIP_MASK | _IPC##YY##_U##XX##BIS_MASK; \
IPC##YY##SET = (6 << _IPC##YY##_U##XX##BIP_POSITION) | (0 << _IPC##YY##_U##XX##BIS_POSITION); \
\
/* Mode Register Reset (this also stops UART) */ \
U##XX##BMODE = 0; \
\
/* Use BRGH = 1: 4 divisor */ \
U##XX##BMODESET = _U##XX##BMODE_BRGH_MASK; \
U##XX##BBRG = pic32_clock_calculate_brg(4, baudrate); \
\
U##XX##BMODESET = byte_format & 0x07; /* Number of bit, Parity and Stop bits */ \
\
/* Status bits */ \
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U##XX##BSTA = 0; \
U##XX##BSTASET = _U##XX##BSTA_URXEN_MASK | _U##XX##BSTA_UTXEN_MASK; /* Enable RX and TX */ \
added support for pic32 (PIC32MX795F512L)
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\
IEC##ZZ##SET = _IEC##ZZ##_U##XX##BRXIE_MASK; \
\
/* Enable UART port */ \
U##XX##BMODESET = _U##XX##BMODE_UARTEN_MASK; \
\
return UART_NO_ERROR; \
}
/*---------------------------------------------------------------------------*/
#define UART_PORT(XX, YY) \
\
int8_t \
pic32_uart##XX##_write(uint8_t data) \
{ \
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volatile uint8_t wait; \
\
do { \
wait = U##XX##STAbits.UTXBF; \
} while(wait); \
\
added support for pic32 (PIC32MX795F512L)
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U##XX##TXREG = data; \
\
return UART_NO_ERROR; \
}
/*---------------------------------------------------------------------------*/
#ifdef __USE_UART_PORT1A__
UART_PORT(1A, 0)
UART_PORT_INIT_XA(1, 6, 0)
#endif /* __USE_UART_PORT1A__ */
#ifdef __USE_UART_PORT1B__
UART_PORT(1B, 2)
UART_PORT_INIT_XB(1, 12, 2)
#endif /* __USE_UART_PORT1B__ */
#ifdef __USE_UART_PORT2A__
UART_PORT(2A, 1)
UART_PORT_INIT_XA(2, 7, 1)
#endif /* __USE_UART_PORT2A__ */
#ifdef __USE_UART_PORT2B__
UART_PORT(2B, 2)
UART_PORT_INIT_XB(2, 12, 2)
#endif /* __USE_UART_PORT2B__ */
#ifdef __USE_UART_PORT3A__
UART_PORT(3A, 1)
UART_PORT_INIT_XA(3, 8, 1)
#endif /* __USE_UART_PORT3A__ */
#ifdef __USE_UART_PORT3B__
UART_PORT(3B, 2)
UART_PORT_INIT_XB(3, 12, 2)
#endif /* __USE_UART_PORT3B__ */
#endif /* __USE_UART__ */
/** @} */
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