AVR Freaks

Dear Friends

I have modify tutorial basic UART program for receive 5 different command string from PC RS232.

Now all work good if the command string received is long max 4 Char.

When command string is for example 20 char i must send 5 time the same command. Firmware catch only 4 char at time and reply me:
1....4 receive ok
5....9 receive ok
10..14 receive ok
15..19 receive ok
ecc...

In bold the part that I think should be modify:

// Include
#include
#include
// Fine Include

// Define
#define FOSC 4000000
#define BAUD 9600
#define MYUBRR FOSC/16/BAUD-1
#define sbi(var, mask) ((var) |= (uint8_t)(1 << mask))
#define cbi(var, mask) ((var) &= (uint8_t)~(1 << mask))
#define STATUS_LED 0
// Fine Define

//Prototipi di funzioni
void ioinit(void);
static int uart_putchar(char c, FILE *stream);
uint8_t uart_getchar(void);
static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);
void delay_ms(uint16_t x);
//Fine prototipi di funzioni

int main (void)
{

//Definizioni variabili
uint8_t key_press;
int InBuffer_UID[3];
int InBuffer_20[20];
int InBuffer_new_key_card[20];
int InBuffer_scrivi_record[20];
int InBuffer_new_key_reader[9];
int InBuffer_leggi_record[4];
int i;
//Fine Definizioni variabili

ioinit(); //Setup IO pins and defaults

while(1)
{
key_press = uart_getchar();

switch ((int)key_press)
{

//----------------------------//
// -------- Caso UID ---------//
//----------------------------//
case 49: //Carattere reale <3>

InBuffer_UID[1]=(int)key_press;
printf("1 Carattere = %c" ,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_UID[1]);

for (i=2; i<4; i++)
{
key_press = uart_getchar();
InBuffer_UID[i]=(int)key_press;
printf("%d Carattere = %c" ,i,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_UID[i]);
}

if ((InBuffer_UID[1]==49) && (InBuffer_UID[3]==51))
{
printf("Comando UID arrivato con successo \n");
}

break;
// ************* Fine Caso UID ***************

//----------------------------------------------//
// ----- Caso New Key Card & Scrivi Record -----//
//----------------------------------------------//
case 113: //Carattere reale <20>

InBuffer_20[1]=(int)key_press;
printf("1 Carattere = %c" ,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_20[1]);

for (i=2; i<21; i++)
{
key_press = uart_getchar();
InBuffer_20[i]=(int)key_press;
printf("%d Carattere = %c" ,i,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_20[i]);
}

// ------------- New Key Card -----------------
// <20> <21>
if ((InBuffer_20[1]==113) && (InBuffer_20[3]==101))
{
for(i=1; i<21; i++)
{
InBuffer_new_key_card[i] = InBuffer_20[i];
}
printf("Comando New Key Card arrivato con successo \n");

}
// ------------- Fine New Key Card -----------------

// ------------- Scrivi Record -----------------
// <20> <14>
if ((InBuffer_20[1]==113) && (InBuffer_20[3]==52))
{
for(i=1; i<21; i++)
{
InBuffer_scrivi_record[i] = InBuffer_20[i];
}
printf("Comando Scrivi Record arrivato con successo \n");

}

break;
//****** Fine Caso New Key Card & Scrivi Record ******

//------------------------------------------//
// -------- Caso New Key in Reader ---------//
//------------------------------------------//
case 51://Carattere reale <9>
InBuffer_new_key_reader[1]=(int)key_press;
printf("1 Carattere = %c" ,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_new_key_reader[1]);

for (i=2; i<10; i++)
{
key_press = uart_getchar();
InBuffer_new_key_reader[i]=(int)key_press;
printf("%d Carattere = %c" ,i,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_new_key_reader[i]);
}

// <9> <20>
if ((InBuffer_new_key_reader[1]==51) && (InBuffer_new_key_reader[3]==53))
{
printf("Comando New Key Reader arrivato con successo \n");
}
break;
//************** Fine Caso New Key in Reader ****************

//------------------------------------------//
// ----------- Caso Leggi Record -----------//
//------------------------------------------//
case 53://Carattere reale <4>
InBuffer_leggi_record[1]=(int)key_press;
printf("1 Carattere = %c" ,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_leggi_record[1]);

for (i=2; i<5; i++)
{
key_press = uart_getchar();
InBuffer_leggi_record[i]=(int)key_press;
printf("%d Carattere = %c" ,i,key_press);
printf(" ----> Valore ascii = %d\n", InBuffer_leggi_record[i]);
}

// <4> <13>
if ((InBuffer_leggi_record[1]==53) && (InBuffer_leggi_record[3]==55))
{
printf("Comando Leggi Record arrivato con successo \n");
}

break;
}

}

return(0);
}

void ioinit (void)
{
//1 = output, 0 = input
DDRB = 0b11101111; //PB4 = MISO
DDRC = 0b11111111; //
DDRD = 0b11111110; //PORTD (RX on PD0)

//USART Baud rate: 9600
UBRRH = MYUBRR >> 8;
UBRRL = MYUBRR;
UCSRB = (1<<RXEN)|(1<<TXEN);
UCSRC = (1<<URSEL)|(3<<UCSZ0);

stdout = &mystdout; //Required for printf init
}

static int uart_putchar(char c, FILE *stream)
{
if (c == '\n') uart_putchar('\r', stream);

loop_until_bit_is_set(UCSRA, UDRE);
UDR = c;

return 0;
}

uint8_t uart_getchar(void)
{
while( !(UCSRA & (1<<RXC)) );
return(UDR);
}
//General short delays
void delay_ms(uint16_t x)
{
uint8_t y, z;
for ( ; x > 0 ; x--){
for ( y = 0 ; y < 80 ; y++){
for ( z = 0 ; z < 40 ; z++){
asm volatile ("nop");
}
}
}
}