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I am trying to interface sim900 with tm4c123gh6pm using Uart2. i have just tried a very simple code with AT command to get ok response from GSM but so far i am failing to have desired result. can u check my code and guide me further?
#include <stdint.h>
#include<Tm4C123GH6PM.H>
void PLL_Init(void);
void UART2_Init(void);
void UartWrite(char*pstr);
unsigned char Receiver(void);
void Transmitter(unsigned char data);
int main(void){
unsigned char command;
PLL_Init();
UART2_Init();
UartWrite("this program writes");
UartWrite("AT");
}
void UART2_Init(void){
SYSCTL->RCGCUART|=0X00000004;
SYSCTL->RCGCGPIO|=0X00000008;
UART2->CTL&=~0X00000002;
UART2->IBRD=43; //----Setting Baud Rate 115200
UART2->FBRD=26;
UART2->LCRH=0X00000070;
UART2->CTL|=0X00000002;
GPIOD->AFSEL|=0XC0;
GPIOD->DEN|=0XC0;
GPIOD->PCTL=(GPIOC->PCTL&0XFFFFFF00)+0X0000000C0;
GPIOD->AMSEL&=~0XC0;
GPIOD->DIR |=0X80;
}
void PLL_Init(void) {
SYSCTL->RCC2|=0X80000000;
SYSCTL->RCC2|=0X00000800;
SYSCTL->RCC2=(SYSCTL->RCC2&~0X000007C0)+0X00000540;
SYSCTL->RCC2&=~0X80000070;
SYSCTL->RCC2&=~0X80002000;
SYSCTL->RCC2|=0X40000000;
SYSCTL->RCC2=(SYSCTL->RCC2&~0X1FC00000)+(4<<22);
while((SYSCTL->RIS&0X00000040)==0){};
SYSCTL->RCC2&=~0X00000800;
}
void UartWrite(char*pstr){
while(*pstr !=0){
Transmitter(*pstr++);
} }
unsigned char Receiver(void){
while((UART1->FR&0X01)!=0){};
return UART1->DR&0XFF;
}
void Transmitter(unsigned char data){
while((UART1->FR&0X20)!=0){};
UART1->DR=data;
}
