Hi,
A c string is an array of chars ending with a NULL (0).
So "Hello" is
cstr[] = { 'H', 'e', 'l', 'l', 'o', 0 } ;
So we need to read letters from the start of the array to the end,
meantime we need to monitor if the string is too long for the buffer.
As you were specify the buffer length 30, I changed it to 31 for additional NULL.
Schematic
UART Config
May be we can go with the default 4 bytes buffer, but to be safe, I chose 32 (could be 31)
Pins
main.c
=======================
#include "project.h"
#include "stdio.h"
#define STR_LEN 30
#define BS '\b'
int main(void)
{
int str_received = 0 ;
uint8_t c ;
char cstr[STR_LEN+1]; /* one for NULL */
int index = 0 ;
CyGlobalIntEnable; /* Enable global interrupts. */
UART_Start() ;
UART_PutString("\x1b[2J\x1b[;H") ; /* clear screen */
UART_PutString("UART STR Receive Test\n\r") ;
for (;;) {
if ((str_received == 0) && (UART_GetRxBufferSize() > 0)) { /* received some letters */
c = UART_GetByte() ;
if (c == BS) {
if (index > 0) {
index-- ;
cstr[index] = 0 ;
UART_PutString("\b \b") ;
}
} else {
if ((c != '\r')&&(c != '\n')) {
cstr[index] = c ;
index++ ;
if (index >= STR_LEN) {
cstr[STR_LEN] = 0 ;
index = 0 ;
str_received = 1 ;/* but over flow */
}
} else {
cstr[index] = 0 ; /* terminate the string */
index = 0 ;
str_received = 1 ;
}
UART_PutChar(c) ;
}
}
if (str_received) {
int val = strcmp(cstr, "factory cal ph0x0D");
int val1 = strcmp(cstr, "factory cal orp0X0D");
if (val==0) {
UART_PutString("Light \n") ;
LED_Write(1);
UART_PutString("else1");
UART_PutString("\n\r") ;
} else if(val1==0) {
LED_Write(0);
UART_PutString("else2");
UART_PutString("\n\r") ;
}
str_received = 0 ;
}
}
}
=======================
Tera Term log
moto
