📄 timer.h
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/******************************************************************************/
/* TIMER.H - TMS320C6x Peripheral Support Library Timers Support */
/* */
/* This file provides the header for the DSP's timers support. */
/* */
/* */
/* MACRO FUNCTIONS: */
/* TIMER_CTRL_ADDR(chan) */
/* TIMER_PERIOD_ADDR(chan) */
/* TIMER_COUNTER_ADDR(chan) */
/* TIMER_RESET(chan) */
/* TIMER_INIT(chan,ctrl,per,cnt) */
/* TIMER_START(chan) */
/* TIMER_STOP(chan) */
/* TIMER_RESUME(chan) */
/* TIMER_MODE_SELECT(chan,mode) */
/* TIMER_CLK_INTERNAL(chan) */
/* TIMER_CLK_EXTERNAL(chan) */
/* TOUT_ENABLE(chan) */
/* TOUT_DISABLE(chan) */
/* TOUT_VAL(chan,val) */
/* TOUT_ASSERT(chan) */
/* TOUT_NEGATE(chan) */
/* TINP_GET(chan) */
/* TIMER_READ(chan) */
/* TIMER_GET_COUNT(chan) */
/* TIMER_SET_COUNT(chan,val) */
/* TIMER_AVAILABLE(chan) */
/* TIMER_SET_PERIOD(chan,val) */
/* TIMER_GET_PERIOD(chan) */
/* TIMER_GET_TSTAT(chan) */
/* */
/* */
/* FUNCTIONS: */
/* timer_delay() - delay specified number of timer periods */
/* */
/******************************************************************************/
#ifndef _TIMER_H_
#define _TIMER_H_
/*----------------------------------------------------------------------------*/
/* INCLUDES */
/*----------------------------------------------------------------------------*/
#include "regs.h"
/*----------------------------------------------------------------------------*/
/* DEFINES AND MACROS */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/**************************** TIMER REGISTERS *********************************/
#define TIMER_BASE_ADDR 0x01940000
#define TIMER_CTRL_ADDR(chan) \
(TIMER_BASE_ADDR + ((chan) * 0x40000))
#define TIMER_PERIOD_ADDR(chan) \
(TIMER_BASE_ADDR + ((chan) * 0x40000) + 4)
#define TIMER_COUNTER_ADDR(chan) \
(TIMER_BASE_ADDR + ((chan) * 0x40000) + 8)
#define TIMER0_CTRL_ADDR TIMER_CTRL_ADDR(0)
#define TIMER0_PERIOD_ADDR TIMER_PERIOD_ADDR(0)
#define TIMER0_COUNTER_ADDR TIMER_COUNTER_ADDR(0)
#define TIMER1_CTRL_ADDR TIMER_CTRL_ADDR(1)
#define TIMER1_PERIOD_ADDR TIMER_PERIOD_ADDR(1)
#define TIMER1_COUNTER_ADDR TIMER_COUNTER_ADDR(1)
#define TIMER0_CTRL *(volatile unsigned int *)(TIMER0_CTRL_ADDR)
#define TIMER0_PERIOD *(volatile unsigned int *)(TIMER0_PERIOD_ADDR)
#define TIMER0_COUNTER *(volatile unsigned int *)(TIMER0_COUNTER_ADDR)
#define TIMER1_CTRL *(volatile unsigned int *)(TIMER1_CTRL_ADDR)
#define TIMER1_PERIOD *(volatile unsigned int *)(TIMER1_PERIOD_ADDR)
#define TIMER1_COUNTER *(volatile unsigned int *)(TIMER1_COUNTER_ADDR)
/* Timer Control Register Bitfield */
#define FUNC 0
#define INVOUT 1
#define DATOUT 2
#define DATIN 3
#define PWID 4
#define GO 6
#define HLD 7
#define C_P 8
#define CLKSRC 9
#define INVINP 10
#define TSTAT 11
#define TIMER_PULSE_MODE 0
#define TIMER_CLOCK_MODE 1
/*---------------------------------------------------------------------------*/
/* TIMER_RESET - reset timer to conditions defined by device reset */
/*---------------------------------------------------------------------------*/
#define TIMER_RESET(chan) \
{ (*(unsigned int *)(TIMER_CTRL_ADDR(chan)) = 0); \
(*(unsigned int *)(TIMER_PERIOD_ADDR(chan)) = 0); \
(*(unsigned int *)(TIMER_COUNTER_ADDR(chan)) = 0); \
}
/*---------------------------------------------------------------------------*/
/* TIMER_INIT - initialize timer registers */
/*---------------------------------------------------------------------------*/
#define TIMER_INIT(chan,ctrl,per,cnt) \
{ (*(unsigned int *)(TIMER_CTRL_ADDR(chan)) = ctrl); \
(*(unsigned int *)(TIMER_PERIOD_ADDR(chan)) = per); \
(*(unsigned int *)(TIMER_COUNTER_ADDR(chan)) = cnt); \
}
/*---------------------------------------------------------------------------*/
/* TIMER_START - Sets both GO and HOLD bits in Timer Control Register which */
/* resets the Timer Counter Register and enables counting on */
/* on the next clock. (GO bit autoclears) */
/*---------------------------------------------------------------------------*/
#define TIMER_START(chan) \
REG_WRITE(TIMER_CTRL_ADDR(chan),(REG_READ(TIMER_CTRL_ADDR(chan)) | 0xc0))
/*---------------------------------------------------------------------------*/
/* TIMER_STOP - Asserts (clears) the HOLD bit in the Timer Control Register */
/*---------------------------------------------------------------------------*/
#define TIMER_STOP(chan) \
RESET_BIT(TIMER_CTRL_ADDR(chan),HLD)
/*---------------------------------------------------------------------------*/
/* TIMER_RESUME - Negates (sets) the HOLD bit to resume counting without */
/* resetting the counter register */
/*---------------------------------------------------------------------------*/
#define TIMER_RESUME(chan) \
SET_BIT(TIMER_CTRL_ADDR(chan),HLD)
/*---------------------------------------------------------------------------*/
/* TIMER_MODE_SELECT - selects between PULSE and CLOCK modes */
/*---------------------------------------------------------------------------*/
#define TIMER_MODE_SELECT(chan,mode) \
(mode == TIMER_CLOCK_MODE) ? SET_BIT(TIMER_CTRL_ADDR(chan),C_P) \
: RESET_BIT(TIMER_CTRL_ADDR(chan),C_P)
/*---------------------------------------------------------------------------*/
/* TIMER_CLK_INTERNAL - sets CLKSRC to select CPU clock/4 as timer clock */
/*---------------------------------------------------------------------------*/
#define TIMER_CLK_INTERNAL(chan) \
SET_BIT(TIMER_CTRL_ADDR(chan),CLKSRC)
/*---------------------------------------------------------------------------*/
/* TIMER_CLK_EXTERNAL - clears CLKSRC to select TINP as timer clock */
/*---------------------------------------------------------------------------*/
#define TIMER_CLK_EXTERNAL(chan) \
RESET_BIT(TIMER_CTRL_ADDR(chan),CLKSRC)
/*---------------------------------------------------------------------------*/
/* TOUT_ENABLE - configures TOUT as general purpose output pin. */
/* */
/*---------------------------------------------------------------------------*/
#define TOUT_ENABLE(chan) \
RESET_BIT(TIMER_CTRL_ADDR(chan),FUNC)
/*---------------------------------------------------------------------------*/
/* TOUT_DISABLE - configures TOUT as a timer pin; reflects value of TSTAT */
/* conditioned by INVOUT */
/*---------------------------------------------------------------------------*/
#define TOUT_DISABLE(chan) \
SET_BIT(TIMER_CTRL_ADDR(chan),FUNC)
/*---------------------------------------------------------------------------*/
/* TOUT_VAL - assigns val to TOUT pin when TOUT is enabled as general purpose*/
/* output */
/*---------------------------------------------------------------------------*/
#define TOUT_VAL(chan,val) \
ASSIGN_BIT_VAL(TIMER_CTRL_ADDR(chan),DATOUT,val)
/*---------------------------------------------------------------------------*/
/* TOUT_ASSERT - assigns 1 to TOUT pin when TOUT is enabled as general */
/* purpose output */
/*---------------------------------------------------------------------------*/
#define TOUT_ASSERT(chan) \
SET_BIT(TIMER_CTRL_ADDR(chan),DATOUT)
/*---------------------------------------------------------------------------*/
/* TOUT_NEGATE - assigns 0 to TOUT pin when TOUT is enabled as general */
/* purpose output */
/*---------------------------------------------------------------------------*/
#define TOUT_NEGATE(chan) \
RESET_BIT(TIMER_CTRL_ADDR(chan),DATOUT)
/*---------------------------------------------------------------------------*/
/* TINP_GET - returns value on TINP input pin */
/*---------------------------------------------------------------------------*/
#define TINP_GET(chan) \
GET_BIT(TIMER_CTRL_ADDR(chan),DATIN)
/*---------------------------------------------------------------------------*/
/* TIMER_READ - reads value of Timer Counter Register */
/*---------------------------------------------------------------------------*/
#define TIMER_READ(chan) \
(REG_READ(TIMER_COUNTER_ADDR(chan)))
/*---------------------------------------------------------------------------*/
/* TIMER_GET_COUNT - reads value of Timer Counter Register */
/*---------------------------------------------------------------------------*/
#define TIMER_GET_COUNT(chan) \
(REG_READ(TIMER_COUNTER_ADDR(chan)))
/*---------------------------------------------------------------------------*/
/* TIMER_SET_COUNT - reads value of Timer Counter Register */
/*---------------------------------------------------------------------------*/
#define TIMER_SET_COUNT(chan,val) \
(REG_WRITE(TIMER_COUNTER_ADDR(chan),val))
/*---------------------------------------------------------------------------*/
/* TIMER_AVAILABLE - checks timer for availability; returns TRUE or FALSE */
/*---------------------------------------------------------------------------*/
#define TIMER_AVAILABLE(chan) \
(GET_BIT(TIMER_CTRL_ADDR(chan),HLD) ? 0 : 1)
/*---------------------------------------------------------------------------*/
/* TIMER_SET_PERIOD - sets value of Timer Period Register */
/*---------------------------------------------------------------------------*/
#define TIMER_SET_PERIOD(chan,val) \
(REG_WRITE(TIMER_PERIOD_ADDR(chan),val))
/*---------------------------------------------------------------------------*/
/* TIMER_GET_PERIOD - returns value of Timer Period Register */
/*---------------------------------------------------------------------------*/
#define TIMER_GET_PERIOD(chan) \
(REG_READ(TIMER_PERIOD_ADDR(chan)))
/*---------------------------------------------------------------------------*/
/* TIMER_GET_TSTAT - returns value of TSTAT bit in Timer Ctrl Register */
/*---------------------------------------------------------------------------*/
#define TIMER_GET_TSTAT(chan) \
(GET_BIT(TIMER_CTRL_ADDR(chan),TSTAT))
/*----------------------------------------------------------------------------*/
/* GLOBAL VARIABLES */
/*----------------------------------------------------------------------------*/
/*----------------------------------------------------------------------------*/
/* FUNCTIONS */
/*----------------------------------------------------------------------------*/
int timer_delay(short num_timer_periods);
#endif /* ifndef _TIMER_H_ */
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