/****************************************************************************
*   Copyright: (C)2018 Î人ÁèÔÆÎïÍøÖÇ¿ÆʵÑéÊÒ www.iot-yun.com
*      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
* Description: STM32L151C8T6 CubeMX ¿ª·¢°å printfºÍ´®¿Ú³õʼ»¯º¯Êý
*              δʹÓÃÖжÏģʽ´¦Àí·¢ËͺͽÓÊÕ
* 
*   ChangeLog:
*        °æ±¾ºÅ     ÈÕÆÚ       ×÷Õß      ˵Ã÷
*        V1.0.0  2018.11.05  GuoWenxue   ·¢²¼¸Ã°æ±¾
****************************************************************************/

#include <stdio.h>

#include "stm32_usart.h"

static USART_TypeDef* debug_usart=USART1; /* ĬÈÏʹÓô®¿Ú1×÷Ϊµ÷ÊÔ´®¿Ú */

/* ¿ª·¢°åÉϵĸ÷¸ö´®¿ÚËùʹÓõĴ®¿Ú ¹Ü½Å¡¢Ê±ÖÓ¶¨Òå */
stm32_usart_pins_t   usart_pins[USART_MAX] =
{
/* USARTx  GPIOx   Tx_Pin      Rx_Pin      Tx_Pin_source     Rx_Pin_Source     GPIO_AF_USARTx    USART_Clock          TxRx_GPIO_Clock */
	{USART1, GPIOA,  GPIO_Pin_9, GPIO_Pin_10,  GPIO_PinSource9, GPIO_PinSource10, GPIO_AF_USART1, RCC_APB2Periph_USART1, RCC_AHBPeriph_GPIOA},
	{USART2, GPIOA,  GPIO_Pin_2,  GPIO_Pin_3,  GPIO_PinSource2,  GPIO_PinSource3, GPIO_AF_USART2, RCC_APB1Periph_USART2, RCC_AHBPeriph_GPIOA},
	{USART3, GPIOB, GPIO_Pin_10, GPIO_Pin_11, GPIO_PinSource10, GPIO_PinSource11, GPIO_AF_USART3, RCC_APB1Periph_USART3, RCC_AHBPeriph_GPIOB},
};

/* º¯Êý˵Ã÷:  ÅäÖô®¿ÚGPIO¿ÚºÍʱÖÓ£»
 * ²ÎÊý˵Ã÷:  whichÖ¸¶¨ÒªÅäÖõĴ®¿Ú,ÆäÖµÓ¦¸ÃΪ USART_PORT1¡¢USART_PORT2¡¢USART_PORT3£¬¶¨ÒåÔÚstm32_usart.hÖУ»
 * ·µ»ØÖµ:    ÎÞ
 */
void init_usart_gpio(uint8_t which)
{
	GPIO_InitTypeDef   GPIO_InitStructure;	
	
	if( which >= USART_MAX )
		return ;	
	
	/* Enable USART GPIO and USART clock */
  RCC_AHBPeriphClockCmd(usart_pins[which].gpio_clk, ENABLE);
	
	if( USART_PORT1 == which ) 
		RCC_APB2PeriphClockCmd(usart_pins[which].usart_clk, ENABLE);
	else
		RCC_APB1PeriphClockCmd(usart_pins[which].usart_clk, ENABLE);
	
  /* Connect PXx to USARTx_Tx, PXx to USARTx_Rx  */
	GPIO_PinAFConfig(usart_pins[which].group, usart_pins[which].txpin_src, usart_pins[which].gpio_af);
	GPIO_PinAFConfig(usart_pins[which].group, usart_pins[which].rxpin_src, usart_pins[which].gpio_af);
  
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
	
  /* Configure USART Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = usart_pins[which].txpin;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;	
  GPIO_Init(usart_pins[which].group, &GPIO_InitStructure);

  /* Configure USART1 Rx as input floating */	
  GPIO_InitStructure.GPIO_Pin = usart_pins[which].rxpin;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;	
  GPIO_Init(usart_pins[which].group, &GPIO_InitStructure);	

}


/* º¯Êý˵Ã÷:  ÅäÖô®¿ÚµÄ²¨ÌØÂÊ¡¢Êý¾Ýλ¡¢ÆæżУÑéλ¡¢Í£Ö¹Î»¡¢Á÷¿ØµÈ£»
 * ²ÎÊý˵Ã÷:  whichÖ¸¶¨ÒªÅäÖõĴ®¿Ú,ÆäÖµÓ¦¸ÃΪ USART_PORT1¡¢USART_PORT2¡¢USART_PORT3£¬¶¨ÒåÔÚstm32_usart.hÖУ»
 *            baudrate: ²¨ÌØÂÊ,ÆäֵΪ: 115200,9600,4800,2400,1200....
 *            rxirq: ÊÇ·ñʹÄܽÓÊÕÖжϣ» 1->ʹÄÜ   0->²»Ê¹ÄÜ
 *            txirq: ÊÇ·ñʹÄÜ·¢ËÍÖжϣ» 1->ʹÄÜ   0->²»Ê¹ÄÜ
 * ·µ»ØÖµ:    ÎÞ
 */
void stm32_init_usart(uint8_t which, uint32_t baudrate, uint8_t txirq, uint8_t rxirq)
{
	USART_InitTypeDef USART_InitStructure;
	
	if( which >= USART_MAX )
		return ;
	
	init_usart_gpio(which);
	
  /* Configure USART1 */	
  USART_InitStructure.USART_BaudRate = baudrate;						//²¨ÌØÂÊ
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;		//Êý¾Ýλ8λ
  USART_InitStructure.USART_StopBits = USART_StopBits_1;			//ֹͣλ1λ
  USART_InitStructure.USART_Parity = USART_Parity_No;				//ÎÞУÑéλ
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;   //ÎÞÓ²¼þÁ÷¿Ø
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;					//ÊÕ·¢Ä£Ê½
	
  USART_Init(usart_pins[which].USARTx, &USART_InitStructure);		//ÅäÖô®¿Ú²ÎÊýº¯Êý

	
#if 0  /* Not implement yet */
	if( rxirq )   //ʹÄܽÓÊÕÖжÏ
		USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);         
	
	if( txirq )  //ʹÄÜ·¢ËÍ»º³å¿ÕÖÐ¶Ï   	
		USART_ITConfig(USARTx, USART_IT_TXE, ENABLE);						
#endif	
	
  /* Enable the USARTx */
  USART_Cmd(usart_pins[which].USARTx, ENABLE);		
}




/* º¯Êý˵Ã÷: ³õʼ»¯µ÷ÊÔ´®¿Ú,²¢Ö¸¶¨ÏàÓ¦µÄ´®¿ÚΪprintfº¯ÊýµÄÊä³ö´®¿Ú
 * ²ÎÊý˵Ã÷: whichÖ¸¶¨ÒªÅäÖõĴ®¿Ú,ÆäÖµÓ¦¸ÃΪ USART_PORT1¡¢USART_PORT2¡¢USART_PORT3£¬¶¨ÒåÔÚstm32_usart.hÖУ»
 *           baudrate: ²¨ÌØÂÊ,ÆäֵΪ: 115200,9600,4800,2400,1200....
 * ·µ»ØÖµ£º  ÎÞ
 */
void stm32_init_printf(uint8_t which, uint32_t baudrate)
{
	if( which >= USART_MAX )
		return ;
	
	debug_usart = usart_pins[which].USARTx;
	
	/* ³õʼ»¯ USART1µÄGPIO¿Ú */ 
	stm32_init_usart(which, baudrate, TXIRQ_DISABLE, RXIRQ_DISABLE);

	/* Êä³öÒ»¸ö»Ø³µ, secureCRTÈí¼þ²Ù×÷´®¿ÚµÄʱºòÐèÒª */
  USART_PUTCHR(debug_usart, '\n');
}


/* º¯Êý˵Ã÷: printfº¯ÊýʵÏֵĹ³×Óº¯Êý
 * ²ÎÊý˵Ã÷: ch: Òª·¢Ë͵Ä×Ö·û     FILE *f: δʹÓÃ
 * ·µ»ØÖµ£º  ·¢Ë͵Ä×Ö·û
 */
int fputc(int ch, FILE *f) 
{ 
	/* windowsÏ»»ÐзûÊÇ\r\n,Èç¹ûÅöµ½\nÔòÔÚÇ°ÃæÌí¼Ó\r */
	if('\n' == ch)
	{
	   USART_PUTCHR(debug_usart, '\r');
	}
		
  USART_PUTCHR(debug_usart, ch);
	
  return ch; 
}