/*
* 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_timer.c
* \brief TIMER interface for PIC32MX (pic32mx795f512l)
* \author Giovanni Pellerano <giovanni.pellerano@evilaliv3.org>
* \date 2012-03-26
*/
/*
* 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 __TIMER_CODE_TEST__ 0
#if __TIMER_CODE_TEST__
#define __USE_TIMER__ 1
#define __USE_TIMER_1__ 1
#define __USE_TIMER_2__ 1
#define __USE_TIMER_3__ 1
#define __USE_TIMER_4__ 1
#define __USE_TIMER_5__ 1
#define __USE_TIMER_23__ 1
#define __USE_TIMER_45__ 1
#endif /* __TIMER_CODE_TEST__ */
#ifdef __USE_TIMER__
#include <pic32_timer.h>
#include <pic32_clock.h>
#include <pic32_irq.h>
#include <p32xxxx.h>
#include <stdint.h>
#include <stddef.h>
/*---------------------------------------------------------------------------*/
#define TIMERN_16(XX, TT, PP) \
void \
pic32_timer##XX##_enable_irq(void) \
{ \
IFS0CLR = _IFS0_T##XX##IF_MASK; /* Clean Timer IRQ Flag */ \
IEC0SET = _IEC0_T##XX##IE_MASK; /* Enable Timer IRQ */ \
} \
\
void \
pic32_timer##XX##_disable_irq(void) \
{ \
IEC0CLR = _IEC0_T##XX##IE_MASK; /* Disable Timer IRQ */ \
IFS0CLR = _IFS0_T##XX##IF_MASK; /* Clean Timer IRQ Flag */ \
} \
\
uint8_t \
pic32_timer##XX##_init(uint32_t frequency) \
{ \
uint32_t prd = pic32_clock_get_peripheral_clock() / frequency; \
uint8_t tckps; /* Prescale */ \
uint8_t ok = 0; \
\
if(prd <= UINT16_MAX) { \
tckps = TIMER_##TT##_PRESCALE_1; \
ok = 1; \
} else { \
prd = prd / 8; \
} \
\
if(ok == 0) { \
if(prd <= UINT16_MAX) { \
tckps = TIMER_##TT##_PRESCALE_8; \
ok = 1; \
} else { \
prd = prd / 8; \
} \
} \
\
if(ok == 0) { \
if(prd <= UINT16_MAX) { \
tckps = TIMER_##TT##_PRESCALE_64; \
ok = 1; \
} else { \
prd = prd / 4; \
} \
} \
\
if(ok == 0) { \
if(prd <= UINT16_MAX) { \
tckps = TIMER_##TT##_PRESCALE_256; \
} else { \
return -TIMER_ERR_BAD_ARGS; \
} \
} \
\
pic32_timer##XX##_disable_irq(); \
\
IPC##XX##CLR = _IPC##XX##_T##XX##IP_MASK | _IPC##XX##_T##XX##IS_MASK; \
IPC##XX##SET = (7 << _IPC##XX##_T##XX##IP_POSITION) | (PP << _IPC##XX##_T##XX##IS_POSITION); \
T##XX##CON = 0; \
T##XX##CONSET = tckps << _T##XX##CON_TCKPS_POSITION; \
PR##XX = prd; \
TMR##XX = 0; \
\
return TIMER_NO_ERRORS; \
} \
\
void \
pic32_timer##XX##_start(void) \
{ \
T##XX##CONSET = _T##XX##CON_ON_MASK; /* Start Timer */ \
} \
\
void \
pic32_timer##XX##_stop(void) \
{ \
T##XX##CONCLR = _T##XX##CON_ON_MASK; /* Stop Timer */ \
} \
\
uint16_t \
pic32_timer##XX##_get_val(void) \
{ \
return TMR##XX; \
}
/*---------------------------------------------------------------------------*/
#define TIMERN_32(XX, YY, PP) \
\
void \
pic32_timer##XX##YY##_enable_irq(void) \
{ \
pic32_timer##YY##_enable_irq(); \
} \
\
void \
pic32_timer##XX##YY##_disable_irq(void) \
{ \
pic32_timer##YY##_disable_irq(); \
} \
\
uint8_t \
pic32_timer##XX##YY##_init(uint32_t frequency) \
{ \
uint32_t prd = pic32_clock_get_peripheral_clock() / frequency; \
uint8_t tckps; /* Prescale */ \
uint8_t ok = 0; \
\
if(prd <= UINT16_MAX) { \
tckps = TIMER_B_PRESCALE_1; \
ok = 1; \
} else { \
prd = prd / 8; \
} \
\
if(ok == 0) { \
if(prd <= UINT16_MAX) { \
tckps = TIMER_B_PRESCALE_8; \
ok = 1; \
} else { \
prd = prd / 8; \
} \
} \
\
if(ok == 0) { \
if(prd <= UINT16_MAX) { \
tckps = TIMER_B_PRESCALE_64; \
ok = 1; \
} else { \
prd = prd / 4; \
} \
} \
\
if(ok == 0) { \
if(prd <= UINT16_MAX) { \
tckps = TIMER_B_PRESCALE_256; \
} else { \
return -TIMER_ERR_BAD_ARGS; \
} \
} \
\
pic32_timer##XX##_disable_irq(); \
\
IPC##YY##CLR = _IPC##YY##_T##YY##IP_MASK | _IPC##YY##_T##YY##IS_MASK; \
IPC##YY##SET = (7 << _IPC##YY##_T##YY##IP_POSITION) | (PP << _IPC##YY##_T##YY##IS_POSITION); \
T##XX##CON = 0; \
T##XX##CONSET = _T##XX##CON_T32_MASK | (tckps << _T##XX##CON_TCKPS_POSITION); \
PR##XX = prd; \
TMR##XX = 0; \
\
return TIMER_NO_ERRORS; \
} \
\
void \
pic32_timer##XX##YY##_start(void) \
{ \
T##XX##CONSET = _T##XX##CON_ON_MASK; /* Start Timer */ \
} \
\
void \
pic32_timer##XX##YY##_stop(void) \
{ \
T##XX##CONCLR = _T##XX##CON_ON_MASK; /* Stop Timer */ \
} \
\
uint32_t \
pic32_timer##XX##YY##_get_val(void) \
{ \
return TMR##XX; \
}
/*---------------------------------------------------------------------------*/
#ifdef __USE_TIMER_1__
TIMERN_16(1, A, 3)
#endif /* __USE_TIMER_1__ */
#if defined(__USE_TIMER_2__) || defined(__USE_TIMER_23__)
TIMERN_16(2, B, 2)
#endif /* __USE_TIMER_2__ */
#if defined(__USE_TIMER_3__) || defined(__USE_TIMER_23__)
TIMERN_16(3, B, 1)
#endif /* __USE_TIMER_3__ */
#if defined(__USE_TIMER_4__) || defined(__USE_TIMER_45__)
TIMERN_16(4, B, 1)
#endif /* __USE_TIMER_4__ */
#if defined(__USE_TIMER_5__) || defined(__USE_TIMER_45__)
TIMERN_16(5, B, 1)
#endif /* __USE_TIMER_5__ */
#ifdef __USE_TIMER_23__
TIMERN_32(2, 3, 3)
#endif /* __USE_TIMER_23__ */
#ifdef __USE_TIMER_45__
TIMERN_32(4, 5, 2)
#endif /* __USE_TIMER_45__ */
#endif /* __USE_TIMER__ */
/** @} */