robototechnik wrote on Friday, January 25, 2013:
oh sorry, i didnt want, i found simply the file hoster…i thought it will be okay=)
actually i dont know, im only a beginner…ill tell again what was already done:
here ist the code which im trying to run
#include "FreeRTOS.h"
#include "task.h"
#include <avr/io.h>
///////////////////////////////////////////////////////////////////////////////////////
void vServo( void *pvParameters )
{
for (;;)
{
OCR1A=200; //800ìñ/4ìñ
OCR1B=200;
vTaskDelay(500 / portTICK_RATE_MS);
OCR1A=375; //1500ìñ/4ìñ
OCR1B=375;
vTaskDelay(500 / portTICK_RATE_MS);
OCR1A=550; //2200ìñ/4ìñ
OCR1B=550;
vTaskDelay(500 / portTICK_RATE_MS);
}
}
/////////////////////////////////////////////////////////////////////////////////////////////
int main( void )
{
TCCR1A|=(1<<COM1A1)|(1<<COM1B1)|(1<<WGM11);
TCCR1B|=(1<<WGM13)|(1<<WGM12)|(1<<CS11)|(1<<CS10);
ICR1=4999;
DDRD = 0b00110000;
xTaskCreate( vServo,
(signed char * ) "Servo",
configMINIMAL_STACK_SIZE,
NULL,
1,
NULL );
vTaskStartScheduler();
return 0;
}
when the FreeRTOS using Timer1 the PWM for servo will not working, because of the 1000 Hz TICK RATE, the period will be 1 ms.
one man helped me, he changed the file called PORT.c(the one for ATmega 323) and now it look so
#include <stdlib.h>
#include <avr/interrupt.h>
#include "FreeRTOS.h"
#include "task.h"
#define portFLAGS_INT_ENABLED ( ( portSTACK_TYPE ) 0x80 )
#define portCLEAR_COUNTER_ON_MATCH ( ( unsigned char ) 0x08 )
#define portPRESCALE_64 ( ( unsigned char ) 0x03 )
#define portCLOCK_PRESCALER ( ( unsigned long ) 64 )
#define portCOMPARE_MATCH_A_INTERRUPT_ENABLE ( ( unsigned char ) 0x10 )
typedef void tskTCB;
extern volatile tskTCB * volatile pxCurrentTCB;
#define portSAVE_CONTEXT() \
asm volatile ( "push r0 \n\t" \
"in r0, __SREG__ \n\t" \
"cli \n\t" \
"push r0 \n\t" \
"push r1 \n\t" \
"clr r1 \n\t" \
"push r2 \n\t" \
"push r3 \n\t" \
"push r4 \n\t" \
"push r5 \n\t" \
"push r6 \n\t" \
"push r7 \n\t" \
"push r8 \n\t" \
"push r9 \n\t" \
"push r10 \n\t" \
"push r11 \n\t" \
"push r12 \n\t" \
"push r13 \n\t" \
"push r14 \n\t" \
"push r15 \n\t" \
"push r16 \n\t" \
"push r17 \n\t" \
"push r18 \n\t" \
"push r19 \n\t" \
"push r20 \n\t" \
"push r21 \n\t" \
"push r22 \n\t" \
"push r23 \n\t" \
"push r24 \n\t" \
"push r25 \n\t" \
"push r26 \n\t" \
"push r27 \n\t" \
"push r28 \n\t" \
"push r29 \n\t" \
"push r30 \n\t" \
"push r31 \n\t" \
"lds r26, pxCurrentTCB \n\t" \
"lds r27, pxCurrentTCB + 1 \n\t" \
"in r0, 0x3d \n\t" \
"st x+, r0 \n\t" \
"in r0, 0x3e \n\t" \
"st x+, r0 \n\t" \
);
#define portRESTORE_CONTEXT() \
asm volatile ( "lds r26, pxCurrentTCB \n\t" \
"lds r27, pxCurrentTCB + 1 \n\t" \
"ld r28, x+ \n\t" \
"out __SP_L__, r28 \n\t" \
"ld r29, x+ \n\t" \
"out __SP_H__, r29 \n\t" \
"pop r31 \n\t" \
"pop r30 \n\t" \
"pop r29 \n\t" \
"pop r28 \n\t" \
"pop r27 \n\t" \
"pop r26 \n\t" \
"pop r25 \n\t" \
"pop r24 \n\t" \
"pop r23 \n\t" \
"pop r22 \n\t" \
"pop r21 \n\t" \
"pop r20 \n\t" \
"pop r19 \n\t" \
"pop r18 \n\t" \
"pop r17 \n\t" \
"pop r16 \n\t" \
"pop r15 \n\t" \
"pop r14 \n\t" \
"pop r13 \n\t" \
"pop r12 \n\t" \
"pop r11 \n\t" \
"pop r10 \n\t" \
"pop r9 \n\t" \
"pop r8 \n\t" \
"pop r7 \n\t" \
"pop r6 \n\t" \
"pop r5 \n\t" \
"pop r4 \n\t" \
"pop r3 \n\t" \
"pop r2 \n\t" \
"pop r1 \n\t" \
"pop r0 \n\t" \
"out __SREG__, r0 \n\t" \
"pop r0 \n\t" \
);
static void prvSetupTimerInterrupt( void );
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
{
unsigned short usAddress;
*pxTopOfStack = 0x11;
pxTopOfStack--;
*pxTopOfStack = 0x22;
pxTopOfStack--;
*pxTopOfStack = 0x33;
pxTopOfStack--;
usAddress = ( unsigned short ) pxCode;
*pxTopOfStack = ( portSTACK_TYPE ) ( usAddress & ( unsigned short ) 0x00ff );
pxTopOfStack--;
usAddress >>= 8;
*pxTopOfStack = ( portSTACK_TYPE ) ( usAddress & ( unsigned short ) 0x00ff );
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x00;
pxTopOfStack--;
*pxTopOfStack = portFLAGS_INT_ENABLED;
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x00; /* R1 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x02; /* R2 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x03; /* R3 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x04; /* R4 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x05; /* R5 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x06; /* R6 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x07; /* R7 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x08; /* R8 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x09; /* R9 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x10; /* R10 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x11; /* R11 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x12; /* R12 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x13; /* R13 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x14; /* R14 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x15; /* R15 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x16; /* R16 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x17; /* R17 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x18; /* R18 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x19; /* R19 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x20; /* R20 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x21; /* R21 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x22; /* R22 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x23; /* R23 */
pxTopOfStack--;
usAddress = ( unsigned short ) pvParameters;
*pxTopOfStack = ( portSTACK_TYPE ) ( usAddress & ( unsigned short ) 0x00ff );
pxTopOfStack--;
usAddress >>= 8;
*pxTopOfStack = ( portSTACK_TYPE ) ( usAddress & ( unsigned short ) 0x00ff );
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x26; /* R26 X */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x27; /* R27 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x28; /* R28 Y */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x29; /* R29 */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x30; /* R30 Z */
pxTopOfStack--;
*pxTopOfStack = ( portSTACK_TYPE ) 0x031; /* R31 */
pxTopOfStack--;
return pxTopOfStack;
}
portBASE_TYPE xPortStartScheduler( void )
{
prvSetupTimerInterrupt();
portRESTORE_CONTEXT();
asm volatile ( "ret" );
return pdTRUE;
}
void vPortEndScheduler( void )
{
}
void vPortYield( void ) __attribute__ ( ( naked ) );
void vPortYield( void )
{
portSAVE_CONTEXT();
vTaskSwitchContext();
portRESTORE_CONTEXT();
asm volatile ( "ret" );
}
/*-----------------------------------------------------------*/
void vPortYieldFromTick( void ) __attribute__ ( ( naked ) );
void vPortYieldFromTick( void )
{
portSAVE_CONTEXT();
vTaskIncrementTick();
vTaskSwitchContext();
portRESTORE_CONTEXT();
asm volatile ( "ret" );
}
/*-----------------------------------------------------------*/
static void prvSetupTimerInterrupt( void )
{
unsigned long ocr_value=configCPU_CLOCK_HZ / configTICK_RATE_HZ;
unsigned long temp;
unsigned char ps_value=1;
TCCR0=0; TCNT0 = 0;
if(ocr_value > 255) {ocr_value /= 8; ps_value = 2;}
if(ocr_value > 255) {ocr_value /= 8; ps_value = 3;}
if(ocr_value > 255) {ocr_value /= 4; ps_value = 4;}
if(ocr_value > 255) {ocr_value /= 4; ps_value = 5;}
if(ocr_value > 255) return;
OCR0 = (unsigned char) ocr_value;
TIFR = 1<<TOV0;
TIMSK |= 1<<TOIE0;
TCCR0 = ps_value | (1<<WGM01);
}
#if configUSE_PREEMPTION == 1
void SIG_OVERFLOW0( void ) __attribute__ ( ( signal, naked ) );
void SIG_OVERFLOW0( void )
{
vPortYieldFromTick();
asm volatile ( "reti" );
}
#else
void SIG_OVERFLOW0( void ) __attribute__ ( ( signal ) );
void SIG_OVERFLOW0( void )
{
vTaskIncrementTick();
}
#endif
now it looks like the FreeRTOS doesnt TICKs…i mean the PWM frequency is noe okay, with the period of 20ms, but the programm doesnt work, it stops at
OCR1A=200; //800ìñ/4ìñ
OCR1B=200;
vTaskDelay(500 / portTICK_RATE_MS);
and generates PWM in loop(
and i dont know the reason=(
help me please=)