reverse.c

/* ========================================
 *
 * Copyright YOUR COMPANY, THE YEAR
 * All Rights Reserved
 * UNPUBLISHED, LICENSED SOFTWARE.
 *
 * CONFIDENTIAL AND PROPRIETARY INFORMATION
 * WHICH IS THE PROPERTY OF your company.
 *
 * ========================================
*/
#include <project.h>

uint8 getValidByte(){
    uint8 retval = 0u;
    while(UART_SpiUartGetRxBufferSize() < 1);
    retval = UART_UartGetByte();
    return retval;
}
void reverseText(){
    char str[100];
    int i = 0;
    while(1){
        uint8 b = getValidByte();
        if(b != '!'){
            str[i] = b;
            i++;
        }else{
            char reverse[i];
            int k = i;
            for(int j = 0; j < k; j++){
                reverse[j] = str[i-1];
                i--;
            }
            UART_UartPutString(reverse);
            memset(&str, 0, 100);
            i = 0;
            break;
        }
    }
}

void printFlag(){
    UART_UartPutString("YOU WIN");
}
int main (void)
{
    CyGlobalIntEnable;      /* Enable global interrupts */
    volatile int dummy[1];
    *dummy = 0;
    /* Place your initialization/startup code here (e.g. MyInst_Start()) */
    UART_Start();
    for(;;)
    {
        /* Place your application code here */
       reverseText();
       if (*dummy) break;   
    }
    printFlag();
}