#include "stm32f10x_lib.h"
#include <stdio.h>
void RCC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(u32);
void Delay_MS(u16 dly);
#define GPIOA_ODR_A  (GPIOA_BASE+0x0C)
#define GPIOA_IDR_A  (GPIOA_BASE+0x08)
#define GPIOB_ODR_A  (GPIOB_BASE+0x0C)
#define GPIOB_IDR_A  (GPIOB_BASE+0x08)
#define GPIOC_ODR_A  (GPIOC_BASE+0x0C)
#define GPIOC_IDR_A  (GPIOC_BASE+0x08)
#define GPIOD_ODR_A  (GPIOD_BASE+0x0C)
#define GPIOD_IDR_A  (GPIOD_BASE+0x08)
#define GPIOE_ODR_A  (GPIOE_BASE+0x0C)
#define GPIOE_IDR_A  (GPIOE_BASE+0x08)

#define BitBand(Addr,BitNum)    *((volatile unsigned long *)((Addr&0xF0000000)+0x2000000+((Addr&0xfffff)<<5)+(BitNum<<2)))

#define PAout(n)   BitBand(GPIOA_ODR_A,n)
#define PAin(n)    BitBand(GPIOA_IDR_A,n)
#define PBout(n)   BitBand(GPIOB_ODR_A,n)
#define PBin(n)    BitBand(GPIOB_IDR_A,n)
#define PCout(n)   BitBand(GPIOC_ODR_A,n)
#define PCin(n)    BitBand(GPIOC_IDR_A,n)
#define PDout(n)   BitBand(GPIOD_ODR_A,n)
#define PDin(n)    BitBand(GPIOD_IDR_A,n)
#define PEout(n)   BitBand(GPIOE_ODR_A,n)
#define PEin(n)    BitBand(GPIOE_IDR_A,n)


int main(void)
{
	//計算波特率
	float Div;
	u16 M,F; //整數部分與小數部分
	u16 BRR;
	u32 Bound;
	u8 data='A';
	RCC_Configuration();
	GPIO_Configuration();
	//UART 模組的設定、UE位使能
	USART1->CR1 |= (1<<13);  
	//USARTCR1 的M位來定義字長
	USART1->CR1 &= ~(1<<12);
	//在USART CR2中程式設計停止位的位數
	USART1->CR2 &= ~(3<<12);
	//TE位使能
	USART1->CR1 |= (1<<3);
	
	Bound=9600;
	Div = (float)(72*1000*1000)/(Bound*16);
	M = Div; //取整
	F = (Div - M)*16;//小數部分

	//整合USART_BRR
	BRR = M<<4+F;
	USART1->BRR = BRR; //設定波特率


	//傳送多個字元到USART1的TXD
   	for(F=0;F<30;F++)
	{
		USART1->DR = data;
		data++;
		while((USART1->SR & (1<<6))==0) ;	  //SR暫存器第6位判斷是否傳送接束
	}
}

/*******************************************************************************
* Function Name  : Delay_Ms
* Description    : delay 1 ms.
* Input          : dly (ms)
* Output         : None
* Return         : None
*******************************************************************************/
void Delay_MS(u16 dly)
{
	u16 i,j;
	for(i=0;i<dly;i++)
		for(j=1000;j>0;j--);
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
	//----------使用外部RC晶振-----------
	RCC_DeInit();			//初始化為預設值
	RCC_HSEConfig(RCC_HSE_ON);	//使能外部的高速時鐘 
	while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET);	//等待外部高速時鐘使能就緒
	
	//FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);	//Enable Prefetch Buffer
	//FLASH_SetLatency(FLASH_Latency_2);		//Flash 2 wait state
	
	RCC_HCLKConfig(RCC_SYSCLK_Div1);		//HCLK = SYSCLK
	RCC_PCLK2Config(RCC_HCLK_Div1);			//PCLK2 =  HCLK
	RCC_PCLK1Config(RCC_HCLK_Div2);			//PCLK1 = HCLK/2
	RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);	//PLLCLK = 8MHZ * 9 =72MHZ
	RCC_PLLCmd(ENABLE);			//Enable PLLCLK

	while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);	//Wait till PLLCLK is ready
    RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);	//Select PLL as system clock
	while(RCC_GetSYSCLKSource()!=0x08);		//Wait till PLL is used as system clock source
	
	//---------開啟相應外設時鐘--------------------
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);	//使能APB2外設的GPIOA的時鐘	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);	//使能APB2外設的GPIOC的時鐘
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);   //開啟USART1時鐘
	
	//GPIO_PinRemapConfig(GPIO_Remap_USART1,ENABLE);	 
		 
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : 初始化GPIO外設	 USART1與PA9複用.這裡對9 10腳進行設定
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/ 
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure USARTx_Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USARTx_Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

}