Hello,
I am new to UART. I have written my first code to send a character to pc and then switch on and off the led. I am unable to find any character coming to my teraterm application. I am unable to find any data when i make a connection through teraterm to my com port.
The code is as follows:
#include "MKL46Z4.h"
//UART0,PTA1=RX and PTA1=TX
void UART_Init(void){
SIM_SOPT2=SIM_SOPT2| 0x04000000;//Clock to UART0 MCGFLLCLK 48MHz
SIM_SOPT5=SIM_SOPT5 & 0xFFFEFFF8;
//open-drain mode disabled(Clear bit 16) plus
//connection to UART_TX and UART_RX(Module to module interconnect) Clear bit 2,1 and 0
SIM_SCGC4=SIM_SCGC4| 0x00000400;//set bit 10 for giving clock to UART0
SIM_SCGC5=SIM_SCGC5| 0x00000200;//set bit 9 for giving clock to PORTA
PORTA_PCR1=PORTA_PCR1|0x00000200;//PTA1 as UART1_RX (set bit 9 for alternative 2 which is UART0_RX)
PORTA_PCR2=PORTA_PCR2|0x00000200;//PTA2 as UART1_RX (set bit 9 for alternative 2 which is UART0_TX)
UART0_C2=0x00;//TX and RX both disabled
UART0_BDH=0x01;//Baud rate =9600,48Mhz clock
UART0_BDL=0x38;//BR=132.5=132=100111000
UART0_C1=0x00;
UART0_S2=UART0_S1 & 0xC1;
UART0_C3=0x00;
UART0_C4=0x0F;//OSR=16
UART0_C5=UART0_C5 & 0x5C;
UART0_C2=UART0_C2 | 0x0C;//TX and RX enable
}
void InitLEDG(void)
{
SIM_SCGC5=SIM_SCGC5|SIM_SCGC5_PORTD_MASK;//Enable clock to PORTD
PORTD_PCR5=256;//declare pins as GPIO
GPIOD_PDDR=GPIOD_PDDR | 0x00000020;//set pin as output
GPIOD_PDOR=GPIOD_PDOR | 0x00000020;//LED initially off
}
void InitSYSTICK(void)
{
//this is a 24 bit down counter
SysTick->CTRL=0;//disable timer
SysTick->LOAD=0x00FFFFFF;//load to full value 0x00FFFFFF
SysTick->VAL=0;//write anything to reset register
SysTick->CTRL=0x00000004;//1=bus clock, 0=disable interrupt, 0=disable systick
}
void delay(void)
{
SysTick->VAL=0;//reset counter
SysTick->CTRL=0x00000005;//enable counter
while((SysTick->CTRL & 0x00010000) == 0)//check flag
{
}
}
unsigned char UART_InChar(void){
while(UART0_S1 & 0x20 !=0){
return(UART0_D);
}
}
void UART_OutChar(unsigned char data){
while(UART0_S1 & 0x80 != 0){
UART0_D=data;
}
}
int main(){
UART_Init();
InitLEDG();
InitSYSTICK();
unsigned char x='a';
while(1){
UART_OutChar(x);
GPIOD_PDOR= 0u<<5;
delay();
GPIOD_PDOR= 1u<<5;
delay();
}
return 0;
}
The led is blinking but i cannot see any data coming on my teraterm.
Please help me.
Thanking you
Also if possible please send me some reference links where i can learn more about some terms that i cannot understand from the reference manual like Loop mode,receiver source select etc.
