#include "usart2.h"
#include "stm32f4xx.h"
#include "buff.h"
 


/*----------------------USART配置宏 ------------------------*/

#define   USART_BaudRate_  115200

#if 0

#define   USART_TX_PIN				  GPIO_Pin_9
#define	  USART_TX_PORT				  GPIOA
#define	  USART_TX_CLK				  RCC_AHB1Periph_GPIOA
#define   USART_TX_PinSource    GPIO_PinSource9

#define   USART_RX_PIN				  GPIO_Pin_10
#define	  USART_RX_PORT				  GPIOA
#define	  USART_RX_CLK				  RCC_AHB1Periph_GPIOA
#define   USART_RX_PinSource    GPIO_PinSource10

#define   GPIO_AF_USART         GPIO_AF_USART1
#define   USART                 USART1
#define   USART_IRQn            USART1_IRQn
#define   USART_CLK_ON()        RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE)
#define   USART_CLK_OFF()       RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, DISABLE)

#define   USART_IRQHandler      USART1_IRQHandler

#else

#define   USART_TX_PIN				  GPIO_Pin_5
#define	  USART_TX_PORT				  GPIOD
#define	  USART_TX_CLK				  RCC_AHB1Periph_GPIOD
#define   USART_TX_PinSource    GPIO_PinSource5

#define   USART_RX_PIN				  GPIO_Pin_6
#define	  USART_RX_PORT				  GPIOD
#define	  USART_RX_CLK				  RCC_AHB1Periph_GPIOD
#define   USART_RX_PinSource    GPIO_PinSource6

#define   GPIO_AF_USART         GPIO_AF_USART2
#define   USART                 USART2
#define   USART_IRQn            USART2_IRQn
#define   USART_CLK_ON()        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE)
#define   USART_CLK_OFF()       RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, DISABLE)

#define   USART_IRQHandler      USART2_IRQHandler

#endif


static data_buff g_recv;
static void (*g_recv_cb)(uint8_t d);

// 函数：usart IO口初始化
//
static void  USART_GPIO_Config	(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_AHB1PeriphClockCmd ( USART_TX_CLK|USART_RX_CLK, ENABLE); 	//IO口时钟配置

	//IO配置
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;   	 //复用模式
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;   //推挽
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;		 //上拉
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; //速度等级

	//初始化 TX	引脚
	GPIO_InitStructure.GPIO_Pin = USART_TX_PIN;	 
	GPIO_Init(USART_TX_PORT, &GPIO_InitStructure);	
	//初始化 RX 引脚													   
	GPIO_InitStructure.GPIO_Pin = USART_RX_PIN;	
	GPIO_Init(USART_RX_PORT, &GPIO_InitStructure);		
	
	//IO复用，复用到USART
	GPIO_PinAFConfig(USART_TX_PORT,USART_TX_PinSource,GPIO_AF_USART); 
	GPIO_PinAFConfig(USART_RX_PORT,USART_RX_PinSource,GPIO_AF_USART);	
}

// 函数：USART 口初始化
//
void usart2_init(void)
{		
	USART_InitTypeDef USART_InitStructure;
	USART_CLK_ON();
	
	// IO口初始化
	USART_GPIO_Config();
		 
	// 配置串口各项参数
	USART_InitStructure.USART_BaudRate 	 = USART_BaudRate_; //波特率
	USART_InitStructure.USART_WordLength = USART_WordLength_8b; //数据位8位
	USART_InitStructure.USART_StopBits   = USART_StopBits_1; //停止位1位
	USART_InitStructure.USART_Parity     = USART_Parity_No ; //无校验
	USART_InitStructure.USART_Mode 	    = USART_Mode_Rx | USART_Mode_Tx; //发送和接收模式
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // 不使用硬件流控制
	
	USART_Init(USART,&USART_InitStructure); //初始化串口1
	USART_Cmd(USART,ENABLE);	//使能串口1

  buff_init(&g_recv,1024,1,0xff,0xfc);
  
	/* 打开接收中断 */
	USART_ITConfig(USART,USART_IT_RXNE,ENABLE);
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel=USART_IRQn; //定时器中断
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00; //抢占优先级1
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01; //子优先级3
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_Init(&NVIC_InitStructure);

}


void usart2_deinit(void)
{
	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel=USART_IRQn; //定时器中断
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0x00; //抢占优先级1
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=0x01; //子优先级3
	NVIC_InitStructure.NVIC_IRQChannelCmd=DISABLE;
	NVIC_Init(&NVIC_InitStructure);
  USART_DeInit(USART);
  
  buff_deinit(&g_recv);
}


void usart2_set_cbcall(void (*cb)(uint8_t))
{
  g_recv_cb=cb;
}

int usart2_get_byte(uint8_t *data)
{
	return buff_read_byte(&g_recv,data);
}

int usart2_put_byte(uint8_t data)
{
	USART_SendData(USART, data);
	while (USART_GetFlagStatus(USART, USART_FLAG_TXE) == RESET);		
	return 0;
}


int usart2_clear(void)
{
  return buff_clear(&g_recv);
}

void USART_IRQHandler (void)
{
	uint8_t t=0;
	if(USART->SR&USART_FLAG_RXNE)
	{
		t=USART->DR;
		buff_save_byte(&g_recv,t);
    if(g_recv_cb) g_recv_cb(t);
	}
	else
	{
		t=USART->SR;
		t=USART->DR;
	}
}