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Tidy up and comment.

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This commit is contained in:
Richard Barry 2009-02-04 16:53:52 +00:00
parent bfd67da1e7
commit c1a2e601a6
3 changed files with 64 additions and 72 deletions
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52
Source/portable/IAR/78K0R/port.c
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@ -54,20 +54,22 @@
#include "FreeRTOS.h"
#include "task.h"
/* The critical nesting value is initialised to a non zero value to ensure
interrupts don't accidentally become enabled before the scheduler is started. */
#define portINITIAL_CRITICAL_NESTING (( unsigned portSHORT ) 10)
/* default Initialization of the PSW for the task:
/* Initial PSW value allocated to a newly created task.
* 1100011000000000
* ||||||||-------------- Fill byte
* |||||||--------------- Cary Flag cleared
* |||||||--------------- Carry Flag cleared
* |||||----------------- In-service priority Flags set to low level
* ||||------------------ Register bank Select 0 Flag cleared
* |||------------------- Auxiliary Cary Flag cleared
* |||------------------- Auxiliary Carry Flag cleared
* ||-------------------- Register bank Select 1 Flag cleared
* |--------------------- Zero Flag set
* ---------------------- Global Interrupt Flag set (enabled)
*/
#define portPSW (0xc6000000UL)
#define portPSW (0xc6UL)
/* We require the address of the pxCurrentTCB variable, but don't want to know
any details of its type. */
@ -112,36 +114,39 @@ unsigned long *pulLocal;
#if configMEMORY_MODE == 1
{
/* Parameters are passed in on the stack. */
/* Parameters are passed in on the stack, and written using a 32bit value
hence a space is left for the second two bytes. */
pxTopOfStack--;
/* Write in the parameter value. */
pulLocal = ( unsigned long * ) pxTopOfStack;
*pulLocal = ( unsigned long ) pvParameters;
pxTopOfStack--;
/* Dummy values on the stack because there normaly the return address
of the funtion is written. */
/* These values are just spacers. The return address of the function
would normally be written here. */
*pxTopOfStack = ( portSTACK_TYPE ) 0xcdcd;
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xcdcd;
pxTopOfStack--;
/* Initial PSW value. */
// *pxTopOfStack = portPSW;
/* The start address / PSW value is also written in as a 32bit value,
so leave a space for the second two bytes. */
pxTopOfStack--;
/* Task function start address. */
/* Task function start address combined with the PSW. */
pulLocal = ( unsigned long * ) pxTopOfStack;
*pulLocal = ( ( ( unsigned long ) pxCode ) | portPSW );
*pulLocal = ( ( ( unsigned long ) pxCode ) | ( portPSW << 24UL ) );
pxTopOfStack--;
/* Next general purpose register AX. */
/* An initial value for the AX register. */
*pxTopOfStack = ( portSTACK_TYPE ) 0x1111;
pxTopOfStack--;
}
#else
{
TBD
pxTopOfStack--;
/* Task function start address. */
@ -159,7 +164,7 @@ unsigned long *pulLocal;
}
#endif
/* HL. */
/* An initial value for the HL register. */
*pxTopOfStack = ( portSTACK_TYPE ) 0x2222;
pxTopOfStack--;
@ -172,12 +177,13 @@ unsigned long *pulLocal;
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0xBCBC;
pxTopOfStack--;
/* Finally the critical section nesting count is set to zero when the task
first starts. */
*pxTopOfStack = ( portSTACK_TYPE ) portNO_CRITICAL_SECTION_NESTING;
/*
* Return a pointer to the top of the stack we have generated so this can
* be stored in the task control block for the task.
*/
/* Return a pointer to the top of the stack we have generated so this can
be stored in the task control block for the task. */
return pxTopOfStack;
}
/*-----------------------------------------------------------*/
@ -198,17 +204,15 @@ portBASE_TYPE xPortStartScheduler( void )
void vPortEndScheduler( void )
{
/* It is unlikely that the 78K0R/Kx3 port will get stopped. If required simply
/* It is unlikely that the 78K0R port will get stopped. If required simply
disable the tick interrupt here. */
}
/*-----------------------------------------------------------*/
/*
* Hardware initialisation to generate the RTOS tick. This uses Channel 5 of
* the Timer Array Unit (TAU). Any other Channel could also be used.
*/
static void prvSetupTimerInterrupt( void )
{
/* Setup channel 5 of the TAU to generate the tick interrupt. */
/* First the Timer Array Unit has to be enabled. */
TAU0EN = 1;