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Fig. 1. Port Serial Interface

Fig.2. CMIS Library for PORT Serial

#include <stm32f4xx.h>		 
#include "math.h"
#include "stm32f4xx_usart.h" 
#include "stm32f4xx_gpio.h"
#include "misc.h"
#include "stm32f4xx_rcc.h"
#include "HD44780.h"
#include "stdlib.h"
#include "stdio.h"

void USART3_PutChar(char c);

void init_USART3(uint32_t baudrate)
{
           GPIO_InitTypeDef GPIO_InitStruct;
           USART_InitTypeDef USART_InitStruct; 
           NVIC_InitTypeDef NVIC_InitStructure;
           RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
           RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
           GPIO_InitStruct.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9; 
           GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; 
           GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; 
           GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; 
           GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
           GPIO_Init(GPIOD, &GPIO_InitStruct); 
           GPIO_PinAFConfig(GPIOD, GPIO_PinSource8, GPIO_AF_USART3);
           GPIO_PinAFConfig(GPIOD, GPIO_PinSource9, GPIO_AF_USART3);
           USART_InitStruct.USART_BaudRate = baudrate; 
           USART_InitStruct.USART_WordLength = USART_WordLength_8b;
           USART_InitStruct.USART_StopBits = USART_StopBits_1; 
           USART_InitStruct.USART_Parity = USART_Parity_No; 
           USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;            
           USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx; 
           USART_Init(USART3, &USART_InitStruct);
           USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

           NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; 
           NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
           NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; 
           NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 
           NVIC_Init(&NVIC_InitStructure); 
           USART_Cmd(USART3, ENABLE);
}
void USART_puts(USART_TypeDef* USARTx, volatile char *s)
{
 while(*s) 
 {
           while( !(USARTx->SR & 0x00000040) );
           USART_SendData(USARTx, *s);
           *s++;
 }
}
           //

int main(void)
{
           init_USART3(115200);
           USART_puts(USART3,"Percobaan");
           while (1)
           {
           }
}