Uart to int conversion

[VYada.3]

Hi

im hoping someone can help me, honestly it might be a easy thing to do, however i have been cracking my brain around this and can't seem to get it to work.

uint8_t Rx_data[6] = {0};

HAL_UART_Receive(&huart1, Rx_data, 6, 1000);
printf("%s\n", Rx_data);

above is my code that reads from the serial port and outputs the data of what has been passed to the microcontroller

*030,R
*023,A
*046,A
*015,R

above is what the data looks like and i need to get the numbers and convert them to a int so i can use them in a if statement as an example

if(5 > (int value){

//do something

}

if someone could help that would be great

Thank you

 

EDIT: Edited by ST Moderator to add the right Topics.

[gbm]

Have you ever heard of a sscanf() function from C standard library? Or maybe atoi()?

[VYada.3]

hi

i havent scanf but have atoi. will look at scanf

i have got it to work using this

char string_var[100];
size_t bufflen = sizeof(Rx_data);
memcpy( string_var, Rx_data, bufflen );
string_var[bufflen] = '\0';
char *p = strtok(string_var, ",");
char *p2 = strtok(p, "*");

int speed = atoi(p2);

printf("%d\n", speed);

 

i feel as if there is an easier way

[Karl Yamashita]

You can type cast it when you use strtok so you don't have to copy from your Rx_data to string_var. Since you only care for the number you can just use 1 pointer and "*" delimiter

uint8_t data[] = "*030,R";
 
int main()
{
 int speed;
 char *token;

 token = strtok((char*) data,"*");
 speed = atoi(token);
 
 printf("Speed:%d\n", speed);

 return 0;
}

// output
Speed:30