/* | |
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*/ | |
/*----------------------------------------------------------- | |
* Implementation of functions defined in portable.h for the ST STR75x ARM7 | |
* port. | |
*----------------------------------------------------------*/ | |
/* Library includes. */ | |
#include "75x_tb.h" | |
#include "75x_eic.h" | |
/* Scheduler includes. */ | |
#include "FreeRTOS.h" | |
#include "task.h" | |
/* Constants required to setup the initial stack. */ | |
#define portINITIAL_SPSR ( ( portSTACK_TYPE ) 0x1f ) /* System mode, ARM mode, interrupts enabled. */ | |
#define portTHUMB_MODE_BIT ( ( portSTACK_TYPE ) 0x20 ) | |
#define portINSTRUCTION_SIZE ( ( portSTACK_TYPE ) 4 ) | |
/* Constants required to handle critical sections. */ | |
#define portNO_CRITICAL_NESTING ( ( unsigned long ) 0 ) | |
/* Prescale used on the timer clock when calculating the tick period. */ | |
#define portPRESCALE 20 | |
/*-----------------------------------------------------------*/ | |
/* Setup the TB to generate the tick interrupts. */ | |
static void prvSetupTimerInterrupt( void ); | |
/*-----------------------------------------------------------*/ | |
/* | |
* Initialise the stack of a task to look exactly as if a call to | |
* portSAVE_CONTEXT had been called. | |
* | |
* See header file for description. | |
*/ | |
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters ) | |
{ | |
portSTACK_TYPE *pxOriginalTOS; | |
pxOriginalTOS = pxTopOfStack; | |
/* To ensure asserts in tasks.c don't fail, although in this case the assert | |
is not really required. */ | |
pxTopOfStack--; | |
/* Setup the initial stack of the task. The stack is set exactly as | |
expected by the portRESTORE_CONTEXT() macro. */ | |
/* First on the stack is the return address - which in this case is the | |
start of the task. The offset is added to make the return address appear | |
as it would within an IRQ ISR. */ | |
*pxTopOfStack = ( portSTACK_TYPE ) pxCode + portINSTRUCTION_SIZE; | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0xaaaaaaaa; /* R14 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) pxOriginalTOS; /* Stack used when task starts goes in R13. */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x12121212; /* R12 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x11111111; /* R11 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x10101010; /* R10 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x09090909; /* R9 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x08080808; /* R8 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x07070707; /* R7 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x06060606; /* R6 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x05050505; /* R5 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x04040404; /* R4 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x03030303; /* R3 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x02020202; /* R2 */ | |
pxTopOfStack--; | |
*pxTopOfStack = ( portSTACK_TYPE ) 0x01010101; /* R1 */ | |
pxTopOfStack--; | |
/* When the task starts is will expect to find the function parameter in | |
R0. */ | |
*pxTopOfStack = ( portSTACK_TYPE ) pvParameters; /* R0 */ | |
pxTopOfStack--; | |
/* The status register is set for system mode, with interrupts enabled. */ | |
*pxTopOfStack = ( portSTACK_TYPE ) portINITIAL_SPSR; | |
#ifdef THUMB_INTERWORK | |
{ | |
/* We want the task to start in thumb mode. */ | |
*pxTopOfStack |= portTHUMB_MODE_BIT; | |
} | |
#endif | |
pxTopOfStack--; | |
/* Interrupt flags cannot always be stored on the stack and will | |
instead be stored in a variable, which is then saved as part of the | |
tasks context. */ | |
*pxTopOfStack = portNO_CRITICAL_NESTING; | |
return pxTopOfStack; | |
} | |
/*-----------------------------------------------------------*/ | |
portBASE_TYPE xPortStartScheduler( void ) | |
{ | |
extern void vPortISRStartFirstTask( void ); | |
/* Start the timer that generates the tick ISR. Interrupts are disabled | |
here already. */ | |
prvSetupTimerInterrupt(); | |
/* Start the first task. */ | |
vPortISRStartFirstTask(); | |
/* Should not get here! */ | |
return 0; | |
} | |
/*-----------------------------------------------------------*/ | |
void vPortEndScheduler( void ) | |
{ | |
/* It is unlikely that the ARM port will require this function as there | |
is nothing to return to. */ | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvSetupTimerInterrupt( void ) | |
{ | |
EIC_IRQInitTypeDef EIC_IRQInitStructure; | |
TB_InitTypeDef TB_InitStructure; | |
/* Setup the EIC for the TB. */ | |
EIC_IRQInitStructure.EIC_IRQChannelCmd = ENABLE; | |
EIC_IRQInitStructure.EIC_IRQChannel = TB_IRQChannel; | |
EIC_IRQInitStructure.EIC_IRQChannelPriority = 1; | |
EIC_IRQInit(&EIC_IRQInitStructure); | |
/* Setup the TB for the generation of the tick interrupt. */ | |
TB_InitStructure.TB_Mode = TB_Mode_Timing; | |
TB_InitStructure.TB_CounterMode = TB_CounterMode_Down; | |
TB_InitStructure.TB_Prescaler = portPRESCALE - 1; | |
TB_InitStructure.TB_AutoReload = ( ( configCPU_CLOCK_HZ / portPRESCALE ) / configTICK_RATE_HZ ); | |
TB_Init(&TB_InitStructure); | |
/* Enable TB Update interrupt */ | |
TB_ITConfig(TB_IT_Update, ENABLE); | |
/* Clear TB Update interrupt pending bit */ | |
TB_ClearITPendingBit(TB_IT_Update); | |
/* Enable TB */ | |
TB_Cmd(ENABLE); | |
} | |
/*-----------------------------------------------------------*/ | |