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camleot23
Joined: 16 Aug 2019
Posts: 52
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| [SOLVED]CCS C- Structures with Pointers |
 Posted: Mon Sep 02, 2019 4:37 am |
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Hello all,
Again me  This time when I load this code to my dsPIC, I can't see my car's model and colour. I exactly get this output from RS232:
First car is :
The color of it :
Max. Speed is : 320
The motor type: 4.19
I want to use pointers. I can see the integers but not strings.
Here is my code:
| Code: |
#include <./33EP64MC206.h>
#use delay(internal=42MHz)
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOJTAG //JTAG disabled
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES FRC
#FUSES NOOSCIO
#use rs232(baud=9600,parity=N,stop=1,xmit=PIN_G7 ,rcv=PIN_G6)
struct vehicle
{
char model[10];
char color[10];
int max_speed;
float motor;
};
void show(struct vehicle *car)
{
printf("First car is : %s \r\n",(*car).model[8]);
printf("The color of it : %s \r\n",(*car).color[5]);
printf("Max. Speed is : %d\r\n",(*car).max_speed);
printf("The motor type: %f \r\n",(*car).motor);
}
void main()
{
setup_oscillator(OSC_INTERNAL,42000000)
struct vehicle first;
struct vehicle *pointer;
pointer=&first;
(*pointer).model[8]="mercedes";
(*pointer).color[5]="black";
(*pointer).max_speed=320;
(*pointer).motor=4.20;
output_toggle(pin_b5);
delay_ms(100);
output_toggle(pin_b5);
delay_ms(100);
output_toggle(pin_b5);
delay_ms(100);
output_toggle(pin_b5);
delay_ms(100);
while(1)
{
show(pointer);
output_toggle(pin_b5);
delay_ms(3000);
}
} |
Last edited by camleot23 on Mon Sep 02, 2019 5:19 am; edited 2 times in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19518
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| Posted: Mon Sep 02, 2019 5:06 am |
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First. to use a structure pointer, look at the -> operator. Much easier to
use in your function.
Then though the big problem is the initialisation. You can't copy a string
with =. This is generic in C. You have to use strcpy, to copy the actual
'string' into the target array. This is why the strings are blank. |
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camleot23
Joined: 16 Aug 2019
Posts: 52
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| Posted: Mon Sep 02, 2019 5:18 am |
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Thank you very much for your time Ttelmah. It's working:)
| Code: |
#include <./33EP64MC206.h>
#use delay(internal=42MHz)
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOJTAG //JTAG disabled
#FUSES CKSFSM //Clock Switching is enabled, fail Safe clock monitor is enabled
#FUSES FRC
#FUSES NOOSCIO
#use rs232(baud=9600,parity=N,stop=1,xmit=PIN_G7 ,rcv=PIN_G6)
struct vehicle
{
char model[10];
char color[10];
int max_speed;
float motor;
};
void show(struct vehicle *car)
{
printf("First car is : %s \r\n",car->model);
printf("The color of it : %s \r\n",car->color);
printf("Max. Speed is : %d\r\n",car->max_speed);
printf("The motor type: %f \r\n",car->motor);
}
void main()
{
setup_oscillator(OSC_INTERNAL,42000000)
struct vehicle first;
struct vehicle *pointer;
pointer=&first;
strcpy(pointer->model,"mercedes");
strcpy(pointer->color,"black");
pointer->max_speed=320;
pointer->motor=4.20;
output_toggle(pin_b5);
delay_ms(100);
output_toggle(pin_b5);
delay_ms(100);
output_toggle(pin_b5);
delay_ms(100);
output_toggle(pin_b5);
delay_ms(100);
while(1)
{
show(pointer);
output_toggle(pin_b5);
delay_ms(3000);
}
} |
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