lib_st.c

ARM入门的好帮手.包含了从简单到相对较复杂的程序.

//*--------------------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*--------------------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*--------------------------------------------------------------------------------------
//* File Name           : lib_st.c
//* Object              : System Timer Library.
//*
//* 1.0 23/05/00  PFi   : Creation
//* 1.1 14/02/02  PFi   : New function has been added. See /* New */
//*--------------------------------------------------------------------------------------

#include    "periph/system_timer/lib_st.h"
#include    "periph/aic/lib_aic.h"
#include    "periph/stdc/lib_err.h"


//*--------------------------------------------------------------------------------------
//* Function Name       : at91_no_handler_st
//* Object              : Default System Timer Interrupt Handler
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : at91_error
//*--------------------------------------------------------------------------------------
static void at91_no_handler_st ( void )
//* Begin
{
    at91_error ( __FILE__, __LINE__ ) ;
//* End
}


//*----------------------------------  New 18/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_enable_interrupt
//* Object              : Initialization of ST's Interrupts
//* Input Parameters    : <*st_pt> : Pointer to the Sytem Timer Descriptor
//*                     : <irq> : IRQ bit(s) to enable in ST_IER
//*                     : <*AsmSTHandler> : Pointer to the C or ASM Interrupt Handler
//* Output Parameters   : none
//* Functions called    : at91_irq_open
//*--------------------------------------------------------------------------------------
void at91_st_enable_interrupt ( const STDesc *st_pt, u_int irq, TypeAICHandler *AsmSTHandler)
{//Begin

    //* Init IRQ at System Timer Level
    st_pt->st_base->ST_IER |= irq ;

    //* Initialize the Interrupt Controller
    at91_irq_open ( st_pt->PeriphId, 7, AIC_SRCTYPE_INT_LEVEL_SENSITIVE, AsmSTHandler ) ;
}


//*----------------------------------  New 18/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_disable_interrupt
//* Object              : Close one or more ST's Interrupts
//* Input Parameters    : <*st_pt> : Pointer to the Sytem Timer Descriptor
//*                     : <irq> : IRQ bit(s) to disable in ST_IDR
//* Output Parameters   : none
//* Functions called    : at91_irq_close
//*--------------------------------------------------------------------------------------
void at91_st_disable_interrupt ( const STDesc *st_pt, u_int irq )
//* Begin
{

        //* Disable IRQs at System Timer level
        st_pt->st_base->ST_IDR = irq ;

//* End
}


//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_wd_mode
//* Object              : Initialize the WatchDog mode of the System Timer.
//* Input Parameters    : <wd_mode>  = mode of watchdog
//* Output Parameters   : none
//* Functions called    : none
//*--------------------------------------------------------------------------------------
void at91_st_wd_mode ( const STDesc *st_pt, u_int wd_mode )
//* Begin
{
    //* Set EXTEN and RSTEN Bit in WatchDog Mode Register
    st_pt->st_base->ST_WDMR |= wd_mode ;

//* End
}

//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_wd_rearm
//* Object              : Restart the WatchDog counter.
//* Input Parameters    : none
//* Output Parameters   : none
//* Functions called    : none
//*--------------------------------------------------------------------------------------
void  at91_st_wd_rearm ( const STDesc *st_pt )
//* Begin
{
    //* Restart the Watch Dog
    st_pt->st_base->ST_CR = ST_WDRST ;

//* End
}

//*----------------------------------  New 14/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_get_status
//* Object              : Read the Status Register of the Sytem Timer
//* Input Parameters    : ST Descriptor
//* Output Parameters   : Status Register (ST_SR)
//* Functions called    : none
//*--------------------------------------------------------------------------------------
u_int at91_st_get_status ( const STDesc *st_pt )
//* Begin
{
    //* Return the System Timer status Register
    return ( st_pt->st_base->ST_SR ) ;

//* End
}

//*----------------------------------  New 14/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_set_prescaler
//* Object              : Set the value of the Real-time Prescaler Value
//* Input Parameters    : <st_pt> : Pointer to the ST Descriptor
//*                     : <pres>  : Value of the prescaler
//* Output Parameters   : none
//* Functions called    : none
//*--------------------------------------------------------------------------------------
void at91_st_set_prescaler ( const STDesc *st_pt, u_short pres )
//* Begin
{
    //* Set the value of the Real-time Prescaler Value
    st_pt->st_base->ST_RTMR = pres ;

//* End
}

//*----------------------------------  New 14/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_get_prescaler
//* Object              : Read the Real-time Prescaler Value
//* Input Parameters    : ST Descriptor
//* Output Parameters   : Value of the prescaler (RTPRES)
//* Functions called    : none
//*--------------------------------------------------------------------------------------
u_int at91_st_get_prescaler ( const STDesc *st_pt )
//* Begin
{
    //* Return the Real-time Prescaler Value
    return ( st_pt->st_base->ST_RTMR ) ;

//* End
}

//*----------------------------------  New 14/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_set_almv
//* Object              : Set the value of the ALMV
//* Input Parameters    : <st_pt> : Pointer to the ST Descriptor
//*                     : <almv>  : Value of the almv
//* Output Parameters   : none
//* Functions called    : none
//*--------------------------------------------------------------------------------------
void at91_st_set_almv ( const STDesc *st_pt, u_short almv )
//* Begin
{
    //* Set the ALMS value
    st_pt->st_base->ST_RTAR = almv ;

//* End
}

//*----------------------------------  New 14/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_get_almv
//* Object              : Get the ALARM Value ALMV
//* Input Parameters    : ST Descriptor
//* Output Parameters   : Register (ST_RTAR)
//* Functions called    : none
//*--------------------------------------------------------------------------------------
u_int at91_st_get_almv ( const STDesc *st_pt )
//* Begin
{
    //* Return the Real-time ALMV Value
    return ( st_pt->st_base->ST_RTAR ) ;

//* End
}


//*----------------------------------  New 14/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_set_piv
//* Object              : Set the Period Interval Value
//* Input Parameters    : ST Descriptor
//*                     : <piv> : Period Interval Value
//* Output Parameters   : none
//* Functions called    : none
//*--------------------------------------------------------------------------------------
void at91_st_set_piv ( const STDesc *st_pt, u_short piv )
//* Begin
{
    //* Set the Period Interval Value
    st_pt->st_base->ST_PIMR = piv ;

//* End
}


//*----------------------------------  New 18/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_get_piv
//* Object              : Read the Period Interval Value
//* Input Parameters    : ST Descriptor
//* Output Parameters   : PIV value (ST_PIMR)
//* Functions called    : none
//*--------------------------------------------------------------------------------------
u_int at91_st_get_piv ( const STDesc *st_pt )
//* Begin
{
    //* Return the Period Interval Value
    return (st_pt->st_base->ST_PIMR ) ;

//* End
}


//*----------------------------------  New 18/02/02 -------------------------------------
//*--------------------------------------------------------------------------------------
//* Function Name       : at91_st_get_rtt_value
//* Object              : Read the Current value of the Real-Time Timer
//* Input Parameters    : ST Descriptor
//* Output Parameters   : Current Real-Time Value (ST_CRTR)
//* Functions called    : none
//*--------------------------------------------------------------------------------------
u_int at91_st_get_rtt_value ( const STDesc *st_pt )
//* Begin
{
    //* Return the Current value of the Real-Time Timer
    return ( st_pt->st_base->ST_CRTR ) ;

//* End
}