moahmedatef
New Member
I'm trying to interface UART0 with the my laptop using the ICDI
the code I used is from Mazidi's book :
and there are no problems with the COM port I've set it up in a correct way and I made sure to modify options for target to get 16Mhz clock frequency and to debug using ICDI ( I'm using keil uvision IDE)
and All I get is this symbol
What should I do ?
the code I used is from Mazidi's book :
C:
#include <stdint.h>
#include "tm4c123gh6pm.h"
void UART0Tx(char c);
void delayMs(int n);
int main(void)
{
SYSCTL->RCGCUART |= 1; /* provide clock to UART0 */
SYSCTL->RCGCGPIO |= 1; /* enable clock to PORTA */
delayMs(20); /* wait for output line to stabilize */
/* UART0 initialization */
UART0->CTL = 0; /* disable UART0 */
UART0->IBRD = 104; /* 16MHz/16=1MHz, 1MHz/104=9600 baud rate */
UART0->FBRD = 11; /* fraction part, see Example 4-4 */
UART0->CC = 0; /* use system clock */
UART0->LCRH = 0x60; /* 8-bit, no parity, 1-stop bit, no FIFO */
UART0->CTL = 0x301; /* enable UART0, TXE, RXE */
/* UART0 TX0 and RX0 use PA0 and PA1. Set them up. */
GPIOA->DEN = 0x03; /* Make PA0 and PA1 as digital */
GPIOA->AFSEL = 0x03; /* Use PA0,PA1 alternate function */
GPIOA->PCTL = 0x11; /* configure PA0 and PA1 for UART */
delayMs(1); /* wait for output line to stabilize */
for(;;)
{
UART0Tx('M');
delayMs(1000) ;
}
}
/* UART0 Transmit */
/* This function waits until the transmit buffer is available then */
/* writes the character in the transmit buffer. It does not wait */
/* for transmission to complete. */
void UART0Tx(char c)
{
while((UART0->FR & 0x20) != 0); /* wait until Tx buffer not full */
UART0->DR = c; /* before giving it another byte */
}
void delayMs(int n)
{
int i = 0 , j = 0 ;
for(i = 0 ; i < n ; i++)
{
for(j = 0 ; j < 3180 ; j++)
{
}
}
}and there are no problems with the COM port I've set it up in a correct way and I made sure to modify options for target to get 16Mhz clock frequency and to debug using ICDI ( I'm using keil uvision IDE)
and All I get is this symbol
What should I do ?