Embedded C Passing a String to function
문제
I'm trying to send an array of characters in C, byte by byte to an output for a microcontroller. I'm using the following code:
int main() {
...
LogOutput("Hello World!");
}
void LogOutput(char *msg) {
int i;
for (i = 0; i < sizeof(msg); i++) {
USART0_TX(msg[i]); // transmit byte
}
}
However, this only sends the first two letters "He" --- does anybody know what I'm doing wrong?
해결책
You're using the sizeof
operator, and getting the size of the datatype, not the length of the string. Use strlen
to get the length of a string (include string.h
for strlen
and other string manipulation functions).
다른 팁
int main() {
...
LogOutput("Hello World!");
}
void LogOutput(char *msg) {
int i;
for (i = 0; i < strlen(msg); i++) {
USART0_TX(msg[i]); // transmit byte
}
}
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