#include "usart.h"
#include "stm32f10x.h"
#include "sys.h"

void uart_init(u32 bound)
{
	//GPIO端口设置
	GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA时钟

	//USART1_TX   GPIOA.9
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
	GPIO_Init(GPIOA, &GPIO_InitStructure);			//初始化GPIOA.9

	//USART1_RX	  GPIOA.10初始化
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;			  //PA10
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
	GPIO_Init(GPIOA, &GPIO_InitStructure);				  //初始化GPIOA.10

	//USART 初始化设置

	USART_InitStructure.USART_BaudRate = bound;										//串口波特率
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;						//字长为8位数据格式
	USART_InitStructure.USART_StopBits = USART_StopBits_1;							//一个停止位
	USART_InitStructure.USART_Parity = USART_Parity_No;								//无奇偶校验位
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制
	USART_InitStructure.USART_Mode = USART_Mode_Tx;									//发模式

	USART_Init(USART1, &USART_InitStructure); //初始化串口1
	USART_Cmd(USART1, ENABLE);				  //使能串口1
}

#if defined(__CC_ARM)
#pragma import(__use_no_semihosting)

struct __FILE
{
	int handle;
} __stdout;

void _sys_exit(int x)
{
	x = x;
}

void _ttywrch(int ch)
{
	ch = ch;
}

/**
 * @brief Override fputc in stdlib.
 */
int fputc(int ch, FILE *f)
{
	while ((USART1->SR & 0X40) == 0)
		;
	USART1->DR = (uint8_t)ch;
	return ch;
}
#elif defined(__GNUC__)
#include <errno.h>
#include <sys/unistd.h> // STDOUT_FILENO, STDERR_FILENO

int _write(int file, char *data, int len)
{

	if ((file != STDOUT_FILENO) && (file != STDERR_FILENO))
	{
		errno = EBADF;
		return -1;
	}
	int i = len;
	// arbitrary timeout 1000
	while (i--)
	{
		while ((USART1->SR & 0X40) == 0)
			;
		USART1->DR = *data;
		data++;
	}

	// return # of bytes written - as best we can tell
	return len;
}
#endif