mirror of
https://github.com/FreeRTOS/FreeRTOS-Kernel.git
synced 2025-06-05 20:09:05 -04:00
Soren Ptak
GitHub
parent
bcf7bdaa13
commit
ac7fc396a0
|
|
@ -27,22 +27,22 @@
|
|||
*/
|
||||
|
||||
/*
|
||||
* Changes from V1.00:
|
||||
*
|
||||
Changes from V1.00:
|
||||
|
||||
+ Call to taskYIELD() from within tick ISR has been replaced by the more
|
||||
+ efficient portSWITCH_CONTEXT().
|
||||
efficient portSWITCH_CONTEXT().
|
||||
+ ISR function definitions renamed to include the prv prefix.
|
||||
+
|
||||
+ Changes from V2.6.1
|
||||
+
|
||||
|
||||
Changes from V2.6.1
|
||||
|
||||
+ Replaced the sUsingPreemption variable with the configUSE_PREEMPTION
|
||||
+ macro to be consistent with the later ports.
|
||||
*/
|
||||
macro to be consistent with the later ports.
|
||||
*/
|
||||
|
||||
/*-----------------------------------------------------------
|
||||
* Implementation of functions defined in portable.h for the Flashlite 186
|
||||
* port.
|
||||
*----------------------------------------------------------*/
|
||||
* Implementation of functions defined in portable.h for the Flashlite 186
|
||||
* port.
|
||||
*----------------------------------------------------------*/
|
||||
|
||||
#include <dos.h>
|
||||
#include <stdlib.h>
|
||||
|
|
@ -69,16 +69,14 @@ static void prvSetTickFrequency( uint32_t ulTickRateHz );
|
|||
static void prvExitFunction( void );
|
||||
|
||||
/* The ISR used depends on whether the preemptive or cooperative scheduler
|
||||
* is being used. */
|
||||
#if ( configUSE_PREEMPTION == 1 )
|
||||
|
||||
/* Tick service routine used by the scheduler when preemptive scheduling is
|
||||
* being used. */
|
||||
is being used. */
|
||||
#if( configUSE_PREEMPTION == 1 )
|
||||
/* Tick service routine used by the scheduler when preemptive scheduling is
|
||||
being used. */
|
||||
static void __interrupt __far prvPreemptiveTick( void );
|
||||
#else
|
||||
|
||||
/* Tick service routine used by the scheduler when cooperative scheduling is
|
||||
* being used. */
|
||||
/* Tick service routine used by the scheduler when cooperative scheduling is
|
||||
being used. */
|
||||
static void __interrupt __far prvNonPreemptiveTick( void );
|
||||
#endif
|
||||
|
||||
|
|
@ -91,9 +89,9 @@ static void __interrupt __far prvYieldProcessor( void );
|
|||
static BaseType_t xSchedulerRunning = pdFALSE;
|
||||
|
||||
/* Points to the original routine installed on the vector we use for manual
|
||||
* context switches. This is then used to restore the original routine during
|
||||
* prvExitFunction(). */
|
||||
static void( __interrupt __far * pxOldSwitchISR )();
|
||||
context switches. This is then used to restore the original routine during
|
||||
prvExitFunction(). */
|
||||
static void ( __interrupt __far *pxOldSwitchISR )();
|
||||
|
||||
/* Used to restore the original DOS context when the scheduler is ended. */
|
||||
static jmp_buf xJumpBuf;
|
||||
|
|
@ -106,14 +104,14 @@ BaseType_t xPortStartScheduler( void )
|
|||
/* This is called with interrupts already disabled. */
|
||||
|
||||
/* Remember what was on the interrupts we are going to use
|
||||
* so we can put them back later if required. */
|
||||
so we can put them back later if required. */
|
||||
pxOldSwitchISR = _dos_getvect( portSWITCH_INT_NUMBER );
|
||||
|
||||
/* Put our manual switch (yield) function on a known
|
||||
* vector. */
|
||||
vector. */
|
||||
_dos_setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
|
||||
|
||||
#if ( configUSE_PREEMPTION == 1 )
|
||||
#if( configUSE_PREEMPTION == 1 )
|
||||
{
|
||||
/* Put our tick switch function on the timer interrupt. */
|
||||
_dos_setvect( portTIMER_INT_NUMBER, prvPreemptiveTick );
|
||||
|
|
@ -146,8 +144,8 @@ BaseType_t xPortStartScheduler( void )
|
|||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* The ISR used depends on whether the preemptive or cooperative scheduler
|
||||
* is being used. */
|
||||
#if ( configUSE_PREEMPTION == 1 )
|
||||
is being used. */
|
||||
#if( configUSE_PREEMPTION == 1 )
|
||||
static void __interrupt __far prvPreemptiveTick( void )
|
||||
{
|
||||
/* Get the scheduler to update the task states following the tick. */
|
||||
|
|
@ -160,15 +158,15 @@ BaseType_t xPortStartScheduler( void )
|
|||
/* Reset the PIC ready for the next time. */
|
||||
portRESET_PIC();
|
||||
}
|
||||
#else /* if ( configUSE_PREEMPTION == 1 ) */
|
||||
#else
|
||||
static void __interrupt __far prvNonPreemptiveTick( void )
|
||||
{
|
||||
/* Same as preemptive tick, but the cooperative scheduler is being used
|
||||
* so we don't have to switch in the context of the next task. */
|
||||
so we don't have to switch in the context of the next task. */
|
||||
xTaskIncrementTick();
|
||||
portRESET_PIC();
|
||||
}
|
||||
#endif /* if ( configUSE_PREEMPTION == 1 ) */
|
||||
#endif
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
static void __interrupt __far prvYieldProcessor( void )
|
||||
|
|
@ -181,31 +179,30 @@ static void __interrupt __far prvYieldProcessor( void )
|
|||
void vPortEndScheduler( void )
|
||||
{
|
||||
/* Jump back to the processor state prior to starting the
|
||||
* scheduler. This means we are not going to be using a
|
||||
* task stack frame so the task can be deleted. */
|
||||
scheduler. This means we are not going to be using a
|
||||
task stack frame so the task can be deleted. */
|
||||
longjmp( xJumpBuf, 1 );
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
static void prvExitFunction( void )
|
||||
{
|
||||
const uint16_t usTimerDisable = 0x0000;
|
||||
uint16_t usTimer0Control;
|
||||
const uint16_t usTimerDisable = 0x0000;
|
||||
uint16_t usTimer0Control;
|
||||
|
||||
/* Interrupts should be disabled here anyway - but no
|
||||
* harm in making sure. */
|
||||
harm in making sure. */
|
||||
portDISABLE_INTERRUPTS();
|
||||
|
||||
if( xSchedulerRunning == pdTRUE )
|
||||
{
|
||||
/* Put back the switch interrupt routines that was in place
|
||||
* before the scheduler started. */
|
||||
before the scheduler started. */
|
||||
_dos_setvect( portSWITCH_INT_NUMBER, pxOldSwitchISR );
|
||||
}
|
||||
|
||||
/* Disable the timer used for the tick to ensure the scheduler is
|
||||
* not called before restoring interrupts. There was previously nothing
|
||||
* on this timer so there is no old ISR to restore. */
|
||||
not called before restoring interrupts. There was previously nothing
|
||||
on this timer so there is no old ISR to restore. */
|
||||
portOUTPUT_WORD( portTIMER_1_CONTROL_REGISTER, usTimerDisable );
|
||||
|
||||
/* Restart the DOS tick. */
|
||||
|
|
@ -220,18 +217,18 @@ static void prvExitFunction( void )
|
|||
|
||||
static void prvSetTickFrequency( uint32_t ulTickRateHz )
|
||||
{
|
||||
const uint16_t usMaxCountRegister = 0xff5a;
|
||||
const uint16_t usTimerPriorityRegister = 0xff32;
|
||||
const uint16_t usTimerEnable = 0xC000;
|
||||
const uint16_t usRetrigger = 0x0001;
|
||||
const uint16_t usTimerHighPriority = 0x0000;
|
||||
uint16_t usTimer0Control;
|
||||
const uint16_t usMaxCountRegister = 0xff5a;
|
||||
const uint16_t usTimerPriorityRegister = 0xff32;
|
||||
const uint16_t usTimerEnable = 0xC000;
|
||||
const uint16_t usRetrigger = 0x0001;
|
||||
const uint16_t usTimerHighPriority = 0x0000;
|
||||
uint16_t usTimer0Control;
|
||||
|
||||
/* ( CPU frequency / 4 ) / clock 2 max count [inpw( 0xff62 ) = 7] */
|
||||
|
||||
const uint32_t ulClockFrequency = ( uint32_t ) 0x7f31a0UL;
|
||||
const uint32_t ulClockFrequency = ( uint32_t ) 0x7f31a0UL;
|
||||
|
||||
uint32_t ulTimerCount = ulClockFrequency / ulTickRateHz;
|
||||
uint32_t ulTimerCount = ulClockFrequency / ulTickRateHz;
|
||||
|
||||
portOUTPUT_WORD( portTIMER_1_CONTROL_REGISTER, usTimerEnable | portTIMER_INTERRUPT_ENABLE | usRetrigger );
|
||||
portOUTPUT_WORD( usMaxCountRegister, ( uint16_t ) ulTimerCount );
|
||||
|
|
|
|||
|
|
@ -52,7 +52,7 @@ typedef portSTACK_TYPE StackType_t;
|
|||
typedef short BaseType_t;
|
||||
typedef unsigned short UBaseType_t;
|
||||
|
||||
#if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
|
||||
#if( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
|
||||
typedef uint16_t TickType_t;
|
||||
#define portMAX_DELAY ( TickType_t ) 0xffff
|
||||
#elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS )
|
||||
|
|
@ -64,22 +64,21 @@ typedef unsigned short UBaseType_t;
|
|||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* Critical section handling. */
|
||||
#define portENTER_CRITICAL() \
|
||||
__asm { pushf } \
|
||||
__asm { cli } \
|
||||
#define portENTER_CRITICAL() __asm{ pushf } \
|
||||
__asm{ cli } \
|
||||
|
||||
#define portEXIT_CRITICAL() __asm { popf }
|
||||
#define portEXIT_CRITICAL() __asm{ popf }
|
||||
|
||||
#define portDISABLE_INTERRUPTS() __asm { cli }
|
||||
#define portDISABLE_INTERRUPTS() __asm{ cli }
|
||||
|
||||
#define portENABLE_INTERRUPTS() __asm { sti }
|
||||
#define portENABLE_INTERRUPTS() __asm{ sti }
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* Hardware specifics. */
|
||||
#define portNOP() __asm { nop }
|
||||
#define portNOP() __asm{ nop }
|
||||
#define portSTACK_GROWTH ( -1 )
|
||||
#define portSWITCH_INT_NUMBER 0x80
|
||||
#define portYIELD() __asm { int portSWITCH_INT_NUMBER }
|
||||
#define portYIELD() __asm{ int portSWITCH_INT_NUMBER }
|
||||
#define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
|
||||
#define portBYTE_ALIGNMENT 2
|
||||
#define portINITIAL_SW ( ( portSTACK_TYPE ) 0x0202 ) /* Start the tasks with interrupts enabled. */
|
||||
|
|
@ -94,7 +93,7 @@ typedef unsigned short UBaseType_t;
|
|||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* Task function macros as described on the FreeRTOS.org WEB site. */
|
||||
#define portTASK_FUNCTION_PROTO( vTaskFunction, vParameters ) void vTaskFunction( void * pvParameters )
|
||||
#define portTASK_FUNCTION( vTaskFunction, vParameters ) void vTaskFunction( void * pvParameters )
|
||||
#define portTASK_FUNCTION_PROTO( vTaskFunction, vParameters ) void vTaskFunction( void *pvParameters )
|
||||
#define portTASK_FUNCTION( vTaskFunction, vParameters ) void vTaskFunction( void *pvParameters )
|
||||
|
||||
#endif /* PORTMACRO_H */
|
||||
|
|
|
|||
|
|
@ -27,16 +27,16 @@
|
|||
*/
|
||||
|
||||
/*
|
||||
* Changes from V2.6.1
|
||||
*
|
||||
Changes from V2.6.1
|
||||
|
||||
+ Replaced the sUsingPreemption variable with the configUSE_PREEMPTION
|
||||
+ macro to be consistent with the later ports.
|
||||
+
|
||||
+ Changes from V4.0.1
|
||||
+
|
||||
macro to be consistent with the later ports.
|
||||
|
||||
Changes from V4.0.1
|
||||
|
||||
+ Add function prvSetTickFrequencyDefault() to set the DOS tick back to
|
||||
+ its proper value when the scheduler exits.
|
||||
*/
|
||||
its proper value when the scheduler exits.
|
||||
*/
|
||||
|
||||
#include <stdlib.h>
|
||||
#include <dos.h>
|
||||
|
|
@ -47,9 +47,9 @@
|
|||
#include "portasm.h"
|
||||
|
||||
/*-----------------------------------------------------------
|
||||
* Implementation of functions defined in portable.h for the industrial
|
||||
* PC port.
|
||||
*----------------------------------------------------------*/
|
||||
* Implementation of functions defined in portable.h for the industrial
|
||||
* PC port.
|
||||
*----------------------------------------------------------*/
|
||||
|
||||
/*lint -e950 Non ANSI reserved words okay in this file only. */
|
||||
|
||||
|
|
@ -62,21 +62,19 @@ static void prvSetTickFrequency( uint32_t ulTickRateHz );
|
|||
static void prvExitFunction( void );
|
||||
|
||||
/* Either chain to the DOS tick (which itself clears the PIC) or clear the PIC
|
||||
* directly. We chain to the DOS tick as close as possible to the standard DOS
|
||||
* tick rate. */
|
||||
directly. We chain to the DOS tick as close as possible to the standard DOS
|
||||
tick rate. */
|
||||
static void prvPortResetPIC( void );
|
||||
|
||||
/* The ISR used depends on whether the preemptive or cooperative
|
||||
* scheduler is being used. */
|
||||
#if ( configUSE_PREEMPTION == 1 )
|
||||
|
||||
/* Tick service routine used by the scheduler when preemptive scheduling is
|
||||
* being used. */
|
||||
scheduler is being used. */
|
||||
#if( configUSE_PREEMPTION == 1 )
|
||||
/* Tick service routine used by the scheduler when preemptive scheduling is
|
||||
being used. */
|
||||
static void __interrupt __far prvPreemptiveTick( void );
|
||||
#else
|
||||
|
||||
/* Tick service routine used by the scheduler when cooperative scheduling is
|
||||
* being used. */
|
||||
/* Tick service routine used by the scheduler when cooperative scheduling is
|
||||
being used. */
|
||||
static void __interrupt __far prvNonPreemptiveTick( void );
|
||||
#endif
|
||||
|
||||
|
|
@ -84,7 +82,7 @@ static void prvPortResetPIC( void );
|
|||
static void __interrupt __far prvYieldProcessor( void );
|
||||
|
||||
/* Set the tick frequency back so the floppy drive works correctly when the
|
||||
* scheduler exits. */
|
||||
scheduler exits. */
|
||||
static void prvSetTickFrequencyDefault( void );
|
||||
|
||||
/*lint -e956 File scopes necessary here. */
|
||||
|
|
@ -96,10 +94,10 @@ static int16_t sDOSTickCounter;
|
|||
static BaseType_t xSchedulerRunning = pdFALSE;
|
||||
|
||||
/* Points to the original routine installed on the vector we use for manual context switches. This is then used to restore the original routine during prvExitFunction(). */
|
||||
static void( __interrupt __far * pxOldSwitchISR )();
|
||||
static void ( __interrupt __far *pxOldSwitchISR )();
|
||||
|
||||
/* Points to the original routine installed on the vector we use to chain to the DOS tick. This is then used to restore the original routine during prvExitFunction(). */
|
||||
static void( __interrupt __far * pxOldSwitchISRPlus1 )();
|
||||
static void ( __interrupt __far *pxOldSwitchISRPlus1 )();
|
||||
|
||||
/* Used to restore the original DOS context when the scheduler is ended. */
|
||||
static jmp_buf xJumpBuf;
|
||||
|
|
@ -109,12 +107,12 @@ static jmp_buf xJumpBuf;
|
|||
/*-----------------------------------------------------------*/
|
||||
BaseType_t xPortStartScheduler( void )
|
||||
{
|
||||
pxISR pxOriginalTickISR;
|
||||
pxISR pxOriginalTickISR;
|
||||
|
||||
/* This is called with interrupts already disabled. */
|
||||
|
||||
/* Remember what was on the interrupts we are going to use
|
||||
* so we can put them back later if required. */
|
||||
so we can put them back later if required. */
|
||||
pxOldSwitchISR = _dos_getvect( portSWITCH_INT_NUMBER );
|
||||
pxOriginalTickISR = _dos_getvect( portTIMER_INT_NUMBER );
|
||||
pxOldSwitchISRPlus1 = _dos_getvect( portSWITCH_INT_NUMBER + 1 );
|
||||
|
|
@ -122,16 +120,16 @@ BaseType_t xPortStartScheduler( void )
|
|||
prvSetTickFrequency( configTICK_RATE_HZ );
|
||||
|
||||
/* Put our manual switch (yield) function on a known
|
||||
* vector. */
|
||||
vector. */
|
||||
_dos_setvect( portSWITCH_INT_NUMBER, prvYieldProcessor );
|
||||
|
||||
/* Put the old tick on a different interrupt number so we can
|
||||
* call it when we want. */
|
||||
call it when we want. */
|
||||
_dos_setvect( portSWITCH_INT_NUMBER + 1, pxOriginalTickISR );
|
||||
|
||||
/* The ISR used depends on whether the preemptive or cooperative
|
||||
* scheduler is being used. */
|
||||
#if ( configUSE_PREEMPTION == 1 )
|
||||
scheduler is being used. */
|
||||
#if( configUSE_PREEMPTION == 1 )
|
||||
{
|
||||
/* Put our tick switch function on the timer interrupt. */
|
||||
_dos_setvect( portTIMER_INT_NUMBER, prvPreemptiveTick );
|
||||
|
|
@ -144,8 +142,8 @@ BaseType_t xPortStartScheduler( void )
|
|||
#endif
|
||||
|
||||
/* Setup a counter that is used to call the DOS interrupt as close
|
||||
* to it's original frequency as can be achieved given our chosen tick
|
||||
* frequency. */
|
||||
to it's original frequency as can be achieved given our chosen tick
|
||||
frequency. */
|
||||
sDOSTickCounter = portTICKS_PER_DOS_TICK;
|
||||
|
||||
/* Clean up function if we want to return to DOS. */
|
||||
|
|
@ -167,8 +165,8 @@ BaseType_t xPortStartScheduler( void )
|
|||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* The ISR used depends on whether the preemptive or cooperative
|
||||
* scheduler is being used. */
|
||||
#if ( configUSE_PREEMPTION == 1 )
|
||||
scheduler is being used. */
|
||||
#if( configUSE_PREEMPTION == 1 )
|
||||
static void __interrupt __far prvPreemptiveTick( void )
|
||||
{
|
||||
/* Get the scheduler to update the task states following the tick. */
|
||||
|
|
@ -181,15 +179,15 @@ BaseType_t xPortStartScheduler( void )
|
|||
/* Reset the PIC ready for the next time. */
|
||||
prvPortResetPIC();
|
||||
}
|
||||
#else /* if ( configUSE_PREEMPTION == 1 ) */
|
||||
#else
|
||||
static void __interrupt __far prvNonPreemptiveTick( void )
|
||||
{
|
||||
/* Same as preemptive tick, but the cooperative scheduler is being used
|
||||
* so we don't have to switch in the context of the next task. */
|
||||
so we don't have to switch in the context of the next task. */
|
||||
xTaskIncrementTick();
|
||||
prvPortResetPIC();
|
||||
}
|
||||
#endif /* if ( configUSE_PREEMPTION == 1 ) */
|
||||
#endif
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
static void __interrupt __far prvYieldProcessor( void )
|
||||
|
|
@ -202,22 +200,19 @@ static void __interrupt __far prvYieldProcessor( void )
|
|||
static void prvPortResetPIC( void )
|
||||
{
|
||||
/* We are going to call the DOS tick interrupt at as close a
|
||||
* frequency to the normal DOS tick as possible. */
|
||||
frequency to the normal DOS tick as possible. */
|
||||
|
||||
/* WE SHOULD NOT DO THIS IF YIELD WAS CALLED. */
|
||||
--sDOSTickCounter;
|
||||
|
||||
if( sDOSTickCounter <= 0 )
|
||||
{
|
||||
sDOSTickCounter = ( int16_t ) portTICKS_PER_DOS_TICK;
|
||||
__asm {
|
||||
int portSWITCH_INT_NUMBER + 1
|
||||
};
|
||||
__asm{ int portSWITCH_INT_NUMBER + 1 };
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Reset the PIC as the DOS tick is not being called to
|
||||
* do it. */
|
||||
do it. */
|
||||
__asm
|
||||
{
|
||||
mov al, 20H
|
||||
|
|
@ -230,20 +225,19 @@ static void prvPortResetPIC( void )
|
|||
void vPortEndScheduler( void )
|
||||
{
|
||||
/* Jump back to the processor state prior to starting the
|
||||
* scheduler. This means we are not going to be using a
|
||||
* task stack frame so the task can be deleted. */
|
||||
scheduler. This means we are not going to be using a
|
||||
task stack frame so the task can be deleted. */
|
||||
longjmp( xJumpBuf, 1 );
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
static void prvExitFunction( void )
|
||||
{
|
||||
void( __interrupt __far * pxOriginalTickISR )();
|
||||
void ( __interrupt __far *pxOriginalTickISR )();
|
||||
|
||||
/* Interrupts should be disabled here anyway - but no
|
||||
* harm in making sure. */
|
||||
harm in making sure. */
|
||||
portDISABLE_INTERRUPTS();
|
||||
|
||||
if( xSchedulerRunning == pdTRUE )
|
||||
{
|
||||
/* Set the DOS tick back onto the timer ticker. */
|
||||
|
|
@ -252,29 +246,28 @@ static void prvExitFunction( void )
|
|||
prvSetTickFrequencyDefault();
|
||||
|
||||
/* Put back the switch interrupt routines that was in place
|
||||
* before the scheduler started. */
|
||||
before the scheduler started. */
|
||||
_dos_setvect( portSWITCH_INT_NUMBER, pxOldSwitchISR );
|
||||
_dos_setvect( portSWITCH_INT_NUMBER + 1, pxOldSwitchISRPlus1 );
|
||||
}
|
||||
|
||||
/* The tick timer is back how DOS wants it. We can re-enable
|
||||
* interrupts without the scheduler being called. */
|
||||
interrupts without the scheduler being called. */
|
||||
portENABLE_INTERRUPTS();
|
||||
}
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
static void prvSetTickFrequency( uint32_t ulTickRateHz )
|
||||
{
|
||||
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
|
||||
const uint16_t usPIT0 = ( uint16_t ) 0x40;
|
||||
const uint32_t ulPIT_CONST = ( uint32_t ) 1193180UL;
|
||||
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
|
||||
uint32_t ulOutput;
|
||||
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
|
||||
const uint16_t usPIT0 = ( uint16_t ) 0x40;
|
||||
const uint32_t ulPIT_CONST = ( uint32_t ) 1193180UL;
|
||||
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
|
||||
uint32_t ulOutput;
|
||||
|
||||
/* Setup the 8245 to tick at the wanted frequency. */
|
||||
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
|
||||
ulOutput = ulPIT_CONST / ulTickRateHz;
|
||||
portOUTPUT_BYTE( usPIT0, ( uint16_t ) ( ulOutput & ( uint32_t ) 0xff ) );
|
||||
portOUTPUT_BYTE( usPIT0, ( uint16_t )( ulOutput & ( uint32_t ) 0xff ) );
|
||||
ulOutput >>= 8;
|
||||
portOUTPUT_BYTE( usPIT0, ( uint16_t ) ( ulOutput & ( uint32_t ) 0xff ) );
|
||||
}
|
||||
|
|
@ -282,13 +275,13 @@ static void prvSetTickFrequency( uint32_t ulTickRateHz )
|
|||
|
||||
static void prvSetTickFrequencyDefault( void )
|
||||
{
|
||||
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
|
||||
const uint16_t usPIT0 = ( uint16_t ) 0x40;
|
||||
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
|
||||
const uint16_t usPIT_MODE = ( uint16_t ) 0x43;
|
||||
const uint16_t usPIT0 = ( uint16_t ) 0x40;
|
||||
const uint16_t us8254_CTR0_MODE3 = ( uint16_t ) 0x36;
|
||||
|
||||
portOUTPUT_BYTE( usPIT_MODE, us8254_CTR0_MODE3 );
|
||||
portOUTPUT_BYTE( usPIT0, 0 );
|
||||
portOUTPUT_BYTE( usPIT0, 0 );
|
||||
portOUTPUT_BYTE( usPIT0,0 );
|
||||
portOUTPUT_BYTE( usPIT0,0 );
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -52,7 +52,7 @@ typedef portSTACK_TYPE StackType_t;
|
|||
typedef short BaseType_t;
|
||||
typedef unsigned short UBaseType_t;
|
||||
|
||||
#if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
|
||||
#if( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
|
||||
typedef uint16_t TickType_t;
|
||||
#define portMAX_DELAY ( TickType_t ) 0xffff
|
||||
#elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS )
|
||||
|
|
@ -64,22 +64,21 @@ typedef unsigned short UBaseType_t;
|
|||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* Critical section management. */
|
||||
#define portENTER_CRITICAL() \
|
||||
__asm { pushf } \
|
||||
__asm { cli } \
|
||||
#define portENTER_CRITICAL() __asm{ pushf } \
|
||||
__asm{ cli } \
|
||||
|
||||
#define portEXIT_CRITICAL() __asm { popf }
|
||||
#define portEXIT_CRITICAL() __asm{ popf }
|
||||
|
||||
#define portDISABLE_INTERRUPTS() __asm { cli }
|
||||
#define portDISABLE_INTERRUPTS() __asm{ cli }
|
||||
|
||||
#define portENABLE_INTERRUPTS() __asm { sti }
|
||||
#define portENABLE_INTERRUPTS() __asm{ sti }
|
||||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* Hardware specifics. */
|
||||
#define portNOP() __asm { nop }
|
||||
#define portNOP() __asm{ nop }
|
||||
#define portSTACK_GROWTH ( -1 )
|
||||
#define portSWITCH_INT_NUMBER 0x80
|
||||
#define portYIELD() __asm { int portSWITCH_INT_NUMBER }
|
||||
#define portYIELD() __asm{ int portSWITCH_INT_NUMBER }
|
||||
#define portDOS_TICK_RATE ( 18.20648 )
|
||||
#define portTICK_PERIOD_MS ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
|
||||
#define portTICKS_PER_DOS_TICK ( ( uint16_t ) ( ( ( portDOUBLE ) configTICK_RATE_HZ / portDOS_TICK_RATE ) + 0.5 ) )
|
||||
|
|
@ -94,7 +93,7 @@ typedef unsigned short UBaseType_t;
|
|||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* Task function macros as described on the FreeRTOS.org WEB site. */
|
||||
#define portTASK_FUNCTION_PROTO( vTaskFunction, pvParameters ) void vTaskFunction( void * pvParameters )
|
||||
#define portTASK_FUNCTION( vTaskFunction, pvParameters ) void vTaskFunction( void * pvParameters )
|
||||
#define portTASK_FUNCTION_PROTO( vTaskFunction, pvParameters ) void vTaskFunction( void *pvParameters )
|
||||
#define portTASK_FUNCTION( vTaskFunction, pvParameters ) void vTaskFunction( void *pvParameters )
|
||||
|
||||
#endif /* PORTMACRO_H */
|
||||
|
|
|
|||
|
|
@ -48,16 +48,16 @@ void portSWITCH_CONTEXT( void );
|
|||
void portFIRST_CONTEXT( void );
|
||||
|
||||
/* There are slightly different versions depending on whether you are building
|
||||
* to include debugger information. If debugger information is used then there
|
||||
* are a couple of extra bytes left of the ISR stack (presumably for use by the
|
||||
* debugger). The true stack pointer is then stored in the bp register. We add
|
||||
* 2 to the stack pointer to remove the extra bytes before we restore our context. */
|
||||
to include debugger information. If debugger information is used then there
|
||||
are a couple of extra bytes left of the ISR stack (presumably for use by the
|
||||
debugger). The true stack pointer is then stored in the bp register. We add
|
||||
2 to the stack pointer to remove the extra bytes before we restore our context. */
|
||||
|
||||
#define portSWITCH_CONTEXT() \
|
||||
asm { mov ax, seg pxCurrentTCB } \
|
||||
asm { mov ds, ax } \
|
||||
asm { les bx, pxCurrentTCB } /* Save the stack pointer into the TCB. */ \
|
||||
asm { mov es : 0x2[ bx ], ss } \
|
||||
asm { mov es:0x2[ bx ], ss } \
|
||||
asm { mov es:[ bx ], sp } \
|
||||
asm { call far ptr vTaskSwitchContext } /* Perform the switch. */ \
|
||||
asm { mov ax, seg pxCurrentTCB } /* Restore the stack pointer from the TCB. */ \
|
||||
|
|
@ -84,4 +84,4 @@ void portFIRST_CONTEXT( void );
|
|||
__asm { iret }
|
||||
|
||||
|
||||
#endif /* ifndef PORT_ASM_H */
|
||||
#endif
|
||||
|
|
|
|||
|
|
@ -27,16 +27,16 @@
|
|||
*/
|
||||
|
||||
/*
|
||||
* Changes from V1.00:
|
||||
*
|
||||
Changes from V1.00:
|
||||
|
||||
+ pxPortInitialiseStack() now initialises the stack of new tasks to the
|
||||
+ same format used by the compiler. This allows the compiler generated
|
||||
+ interrupt mechanism to be used for context switches.
|
||||
+
|
||||
+ Changes from V2.6.1
|
||||
+
|
||||
same format used by the compiler. This allows the compiler generated
|
||||
interrupt mechanism to be used for context switches.
|
||||
|
||||
Changes from V2.6.1
|
||||
|
||||
+ Move usPortCheckFreeStackSpace() to tasks.c.
|
||||
*/
|
||||
*/
|
||||
|
||||
|
||||
#include <dos.h>
|
||||
|
|
@ -46,14 +46,12 @@
|
|||
/*-----------------------------------------------------------*/
|
||||
|
||||
/* See header file for description. */
|
||||
StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
|
||||
TaskFunction_t pxCode,
|
||||
void * pvParameters )
|
||||
StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
|
||||
{
|
||||
StackType_t DS_Reg = 0;
|
||||
StackType_t DS_Reg = 0;
|
||||
|
||||
/* Place a few bytes of known values on the bottom of the stack.
|
||||
* This is just useful for debugging. */
|
||||
This is just useful for debugging. */
|
||||
|
||||
*pxTopOfStack = 0x1111;
|
||||
pxTopOfStack--;
|
||||
|
|
@ -70,8 +68,8 @@ StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
|
|||
/*lint -e950 -e611 -e923 Lint doesn't like this much - but nothing I can do about it. */
|
||||
|
||||
/* We are going to start the scheduler using a return from interrupt
|
||||
* instruction to load the program counter, so first there would be the
|
||||
* function call with parameters preamble. */
|
||||
instruction to load the program counter, so first there would be the
|
||||
function call with parameters preamble. */
|
||||
|
||||
*pxTopOfStack = FP_SEG( pvParameters );
|
||||
pxTopOfStack--;
|
||||
|
|
@ -91,8 +89,8 @@ StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
|
|||
pxTopOfStack--;
|
||||
|
||||
/* The remaining registers would be pushed on the stack by our context
|
||||
* switch function. These are loaded with values simply to make debugging
|
||||
* easier. */
|
||||
switch function. These are loaded with values simply to make debugging
|
||||
easier. */
|
||||
*pxTopOfStack = ( StackType_t ) 0xAAAA; /* AX */
|
||||
pxTopOfStack--;
|
||||
*pxTopOfStack = ( StackType_t ) 0xBBBB; /* BX */
|
||||
|
|
@ -105,9 +103,7 @@ StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
|
|||
pxTopOfStack--;
|
||||
|
||||
/* We need the true data segment. */
|
||||
__asm {
|
||||
MOV DS_Reg, DS
|
||||
};
|
||||
__asm{ MOV DS_Reg, DS };
|
||||
|
||||
*pxTopOfStack = DS_Reg; /* DS */
|
||||
pxTopOfStack--;
|
||||
|
|
|
|||
Loading…
Reference in a new issue