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作业四 单号uart控制LED流水灯转速

#include "stm32f10x.h"
#include "stdio.h"

GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;

#define buff_size 16;
char rx_buff[] ,rx_buff_count=0;

void RCC_Configuration(void) ;
void GPIO_INIT(void) ;
void USART_int(long BaudRate);
void USART_SendStr(char *str);
void delay_ms(u32 n) ;
void delay_us(u32 n);

int main()
{
RCC_Configuration();
GPIO_INIT();
USART_int(9600);
GPIO_ResetBits(GPIOC,0xffff);
delay_ms(200);
GPIO_SetBits(GPIOC,0xffff);
USART_SendStr("USART Led Speed\r\n");
USART_SendStr("\n>");
while(1);
}


void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus==SUCCESS)
{
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PLLCmd(ENABLE);//*??PLL:
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY)==RESET);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08);
}
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_ResetBits(GPIOD,GPIO_Pin_2);
}


void delay_us(u32 n)
{
u8 j;
while(n--)
for(j=0;j<10;j++);
}

void delay_ms(u32 n)
{
while(n--)
delay_us(1000);
}

void GPIO_INIT(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}


void USART_int(long BaudRate)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

USART_InitStructure.USART_BaudRate = BaudRate;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART1, &USART_ClockInitStructure);
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}


void USART_SendStr(char *str)
{
while((*str)!='\0')
{
USART_SendData(USART1,*str++);
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
}


unsigned int translate(char* pstr)
{
int s = 0;
while(*pstr != '\0')
{
if(*pstr >= '0' && *pstr <= '9')
{
s = s * 10 + *pstr - '0';
}
pstr++;
}
return s;
}


void LED(char *S,char LEN)
{
int m,i;
int a[8]={GPIO_Pin_0,GPIO_Pin_1,GPIO_Pin_2,GPIO_Pin_3,GPIO_Pin_4,GPIO_Pin_5,GPIO_Pin_6,GPIO_Pin_7};
m=translate(S);

GPIO_SetBits(GPIOC,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);
delay_ms(100);
for(i=0;i<8;i++)
{
GPIO_ResetBits(GPIOC,a[i]);
delay_ms(m);
GPIO_SetBits(GPIOC,a[i]);
delay_ms(m);
}
}


void input_ASK()
{
char j;
LED(rx_buff,rx_buff_count);
rx_buff_count=0;
for (j=0;j {
rx_buff[j]='\0';
}
USART_SendStr("\n>");
}



void USART1_IRQHandler(void)
{
while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET) { }
if(USART_ReceiveData(USART1)==0x0d)
{
input_ASK();
}
else
{
USART_SendData(USART1,USART_ReceiveData(USART1));
rx_buff[rx_buff_count]= USART_ReceiveData(USART1);
rx_buff_count++;
}

USART_ClearFlag(USART1, USART_FLAG_RXNE);
}

作业五 用定时器做流水灯

/**
******************************************************************************
* @file EXTI/EXTI_Config/main.c
* @author MCD Application Team
* @version V3.5.0
* @date 08-April-2011
* @brief Main program body
******************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*
*

© COPYRIGHT 2011 STMicroelectronics

******************************************************************************
*/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32_eval.h"
#include
/** @addtogroup STM32F10x_StdPeriph_Examples
* @{
*/

/** @addtogroup EXTI_Config
* @{
*/

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
unsigned int flag;
unsigned char led;
void RCC_Configuration(void)
{/*
RCC_DeInit();

RCC_HSICmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);

RCC_SYSCLKConfig(RCC_SYSCLKSource_HSI);

RCC_HSEConfig(RCC_HSE_OFF);
RCC_LSEConfig(RCC_LSE_OFF);
RCC_PLLConfig(RCC_PLLSource_HSI_Div2,RCC_PLLMul_9); // 72HMz
RCC_PLLCmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08);
*/
SystemInit();
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_ResetBits(GPIOD,GPIO_Pin_2);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);//disable JTAG
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_SetBits(GPIOC,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
}

void USART_int(long BaudRate)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_USART1,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* PA10 USART1_Rx */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USARTx configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
USART_InitStructure.USART_BaudRate = BaudRate;//??????
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//???????8bit
USART_InitStructure.USART_StopBits = USART_StopBits_1;//????1
USART_InitStructure.USART_Parity = USART_Parity_No;//????
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//??????none
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//??????????
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART1, &USART_ClockInitStructure);
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

/* Enable the TIM2 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);
}

/* Private functions ---------------------------------------------------------*/

/**
* @brief Main program.
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/

/* System Clocks Configuration */
RCC_Configuration();

NVIC_Configuration();
//USART_int(115200);
// printf("config done...\r\n");

/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 36000;
TIM_TimeBaseStructure.TIM_Prescaler = 100;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE );

/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);

while (1){
//if(flag == 1)
// {printf("TIM2 interrupt......\r\n");
//flag = 0;
}
//else{GPIO_SetBits(GPIOC,GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);}
//}
}

void TIM2_IRQHandler(void) //TIM3 ??
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) //?? TIM3 ????????
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update ); //?? TIM3 ??????
// flag = ~flag;
// if(flag){
// GPIO_SetBits(GPIOC,GPIO_Pin_1);}
// else {GPIO_ResetBits(GPIOC,GPIO_Pin_1);}
flag++;
if(flag == 1)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_0);
}
else if(flag == 2)
{
GPIO_SetBits(GPIOC,GPIO_Pin_0);}
else if(flag == 3)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_1);}
else if(flag == 4)
{
GPIO_SetBits(GPIOC,GPIO_Pin_1);}
else if(flag == 5)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_2);}
else if(flag == 6)
{
GPIO_SetBits(GPIOC,GPIO_Pin_2);}
else if(flag == 7)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_3);}
else if(flag == 8)
{
GPIO_SetBits(GPIOC,GPIO_Pin_3);}
else if(flag == 9)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_4);}
else if(flag == 10)
{
GPIO_SetBits(GPIOC,GPIO_Pin_4);}
else if(flag == 11)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_5);}
else if(flag == 12)
{
GPIO_SetBits(GPIOC,GPIO_Pin_5);}
else if(flag == 13)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_6);}
else if(flag == 14)
{
GPIO_SetBits(GPIOC,GPIO_Pin_6);}
else if(flag == 15)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_7);}
else if(flag == 16)
{
GPIO_SetBits(GPIOC,GPIO_Pin_7);
flag = 0;
}

}
}

#ifdef USE_FULL_ASSERT

/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

/* Infinite loop */
while (1)
{
}
}

#endif

/**
* @}
*/

/**
* @}
*/

#ifdef __GNUC__
/* With GCC/RAISONANCE, small printf (option LD Linker->Libraries->Small printf
set to 'Yes') calls __io_putchar() */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
#else
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
#endif /* __GNUC__ */

/**
* @brief Retargets the C library printf function to the USART.
* @param None
* @retval None
*/
PUTCHAR_PROTOTYPE
{
/* Place your implementation of fputc here */
/* e.g. write a character to the USART */
USART_SendData(EVAL_COM1, (uint8_t) ch);

/* Loop until the end of transmission */
while (USART_GetFlagStatus(EVAL_COM1, USART_FLAG_TC) == RESET)
{}

return ch;
}

#ifdef USE_FULL_ASSERT

/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

/* Infinite loop */
while (1)
{
}
}

#endif

/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/

作业六计算开机次数

sfr IAP_DATA = 0xE2;
sfr IAP_ADDRH = 0xE3;
sfr IAP_ADDRL = 0xE4;
sfr IAP_CMD = 0xE5;
sfr IAP_TRIG = 0xE6;
sfr IAP_CONTR = 0xE7;

#define CMD_IDLE 0
#define CMD_READ 1
#define CMD_PROGRAM 2
#define CMD_ERASE 3

#define ENABLE_IAP0x80
#define ENABLE_IAP0x81
#define ENABLE_IAP0x82
#define ENABLE_IAP0x83

IAP_ADDRESS 0x2000 //STC90C52ϵÁÐEEPROM²âÊÔÆðʼµØÖ·

void IapIdle(void)
{
IAP_CONTR=0;
IAP_CMD =0;
IAP_TRIG =0;
IAP_ADDRH=0x80;
IAP_ADDRL =0;

}

unsigned char IapReadByte(unsigned int addt)
{
unsigned char dat;
IAP_CONTR=ENABLE_IAP;
IAP_CMD =CMD_READ;
IAP_ADDRL=addr;
IAP_ADDRL=addr>>8
IAP_TRIG =0x46;
IAP_TRIG =0xb9;
dat = IAP_DATA;
IapIdle();


return dat;

}

void Iap ProgramByte(unsigned int addr,unsigned char dat )
{
IAP_CONTR=ENABLE_IAP;
IAP_CMD =CMD_REOGRAM;
IAP_ADDRL=addr;
IAP_ADDRH=addr>>8
IAP_DATA=date;
IAP_TRIG =0x46;
IAP_TRIG =0xb9;

IapIdle();
}

void Iap EraseSector(unsigned int addr )
{
IAP_CONTR=ENABLE_IAP;
IAP_CMD =CMD_ERASE;
IAP_ADDRL=addr;
IAP_ADDRH=addr>>8
IAP_TRIG =0x46;
IAP_TRIG =0xb9;

IapIdle();
}
unsigned char Num=0;
void main(void)
{
unsigned long i=0;
Num = Iap ReadByte(IAP_ADDRESS+20);
Num++;
Iap EraseSector(IAP_ADDRESS);
Iap ProgramByte(IAP_ADDRESS+20,Num);
for(i=0;i
{
LED0=0;
DelayMs(100);
LED0=1;
DelayMs(100);
}
while(1);
}

作业七DS18B20温度使灯的颜色变化

#define "ds18b20.h"

#define"delay.h"

#include "sys.h"

#include "usart.h"

#include "led.h"

#include "lcd.h"

void DS18B20_Rst(void)

{

DS18B20_IO_OUT(); //SET PG11 OUTPUT

DS18B20_DQ_OUT=0; //拉低 DQ

delay_us(750); //拉低 750us

DS18B20_DQ_OUT=1; //DQ=1

delay_us(15); //15US

}

//等待 DS18B20 的回应

//返回 1:未检测到 DS18B20 的存在

//返回 0:存在

u8 DS18B20_Check(void)

{

u8 retry=0;

DS18B20_IO_IN();//SET PG11 INPUT

while (DS18B20_DQ_IN&&retry<200) { retry++; delay_us(1); };

if(retry>=200)return 1;

else retry=0;

while (!DS18B20_DQ_IN&&retry<240) {retry++; delay_us(1); };

if(retry>=240)return 1;

return 0;

}

//从 DS18B20 读取一个位

//返回值：1/0

u8 DS18B20_Read_Bit(void)

{

u8 data;

DS18B20_IO_OUT();//SET PG11 OUTPUT

DS18B20_DQ_OUT=0;

delay_us(2);

DS18B20_DQ_OUT=1;

DS18B20_IO_IN();//SET PG11 INPUT

delay_us(12);

if(DS18B20_DQ_IN)data=1;

else data=0;

delay_us(50);

return data;

}

//从 DS18B20 读取一个字节

//返回值：读到的数据

u8 DS18B20_Read_Byte(void)

{

u8 i,j,dat;

dat=0;

for (i=1;i<=8;i++)

{

j=DS18B20_Read_Bit();

dat=(j<<7)|(dat>>1);

}

return dat;

}

//写一个字节到 DS18B20

//dat：要写入的字节

void DS18B20_Write_Byte(u8 dat)

{

u8 j;

u8 testb;

DS18B20_IO_OUT();//SET PG11 OUTPUT;

for (j=1;j<=8;j++)

{

testb=dat&0x01;

dat=dat>>1;

if (testb)

{

DS18B20_DQ_OUT=0;// Write 1

delay_us(2);

DS18B20_DQ_OUT=1;

delay_us(60);

}

else

{

DS18B20_DQ_OUT=0;// Write 0

delay_us(60);

DS18B20_DQ_OUT=1;

delay_us(2);

}

}

}

//开始温度转换

void DS18B20_Start(void)

{

DS18B20_Rst();

DS18B20_Check();

DS18B20_Write_Byte(0xcc);// skip rom

DS18B20_Write_Byte(0x44);// convert

}

//初始化 DS18B20 的 IO 口 DQ 同时检测 DS 的存在

//返回 1:不存在

//返回 0:存在

u8 DS18B20_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOG, ENABLE); //使能 GPIOG 时钟

//GPIOG9

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //普通输出模式

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //50MHz

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉

GPIO_Init(GPIOG, &GPIO_InitStructure); //初始化

DS18B20_Rst();

return DS18B20_Check();

}

//从 ds18b20 得到温度值

//精度：0.1C

//返回值：温度值 （-550~1250）

short DS18B20_Get_Temp(void)

{

u8 temp;

u8 TL,TH;

short tem;

DS18B20_Start();// ds1820 start convert

DS18B20_Rst();

DS18B20_Check();

DS18B20_Write_Byte(0xcc);// skip rom

DS18B20_Write_Byte(0xbe);// convert

TL=DS18B20_Read_Byte(); // LSB

TH=DS18B20_Read_Byte(); // MSB

if(TH>7)

{

TH=~TH;

TL=~TL;

temp=0; //温度为负

}else temp=1; //温度为正

tem=TH; //获得高八位

tem<<=8;

tem+=TL; //获得底八位

tem=(double)tem*0.625; //转换

if(temp)return tem; //返回温度值

else return -tem;

}

//ds18b20.h

#ifndef__DS18B20_H

#define__DS18B20_H

#include"sys.h"

#include"sys.h"

//IO方向设置

#define DS18B20_IO_IN() {GPIOG->MODERA=~(3<<(9*2));GPIOG->MODERA=~(0<<(9*2))} //PG9输入模式

#define DS18B20_IO_OUT() {GPIOG->MODERA=~(3<<(9*2));GPIOG->MODERA=~(0<<(9*2))} //PG9输出模式

//IO操作函数

#define DS18B20_DQ_IN PGout(9) //数据端口 PG9

#define DS18B20_DQ_OUT PGout(9) //数据端口PG9

u8 DS18B20_Init(void); //初始化DS18B20

short DS18B20_Get_Temp(void); //获取温度

void DS18B20_Start(void); //开始温度转换

void DS18B20_Write_Byte(u8 dat); //写 入一个字节

u8 DS18B20_Read_Byte(void); //读出一个字节

u8 DS18B20_Read_Bit(void); //读出一个位

u8 DS18B20_Check(void); //检测是否存在DS18B20

void DS18B20_Rst(void); //复位DS18B20

int main(void)

{

u8 t=0;

short temperature;

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置系统中断优先级分组2

delay_init(168); //初始化延时函数

uart_init(115200); //初始化串口波特率为115200

LED_Init(); //初始化LED

LCD_Init();

POINT_COLOR=RED; //设置字体为红色

LCD_ShowString(30,50,200,16,16,"Explorer STM32F4");

LCD_ShowString(30,70,200,16,16,"DS18B20 TEST");

LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");

LCD_ShowString(30,110,200,16,16,"2014/5/7");

while(DS18B20_Init()) //DS18B20初始化

{

LCD_ShowString(30,130,200,16,16,"DS18B20 Error");

delay_ms(200);

LCD_Fill(30,130,239,130+16,WHITE);

delay_ms(200);

}

LCD_ShowString(30,130,200,16,16,"DS18B20 OK");

POINT_COLOR=BLUE; //设置字体为蓝色

LCD_ShowString(30,150,200,16,16,"Temp: . C");

while(1)

{

if(t%10==0)//每100ms读取一次

{

temperature=DS18B20_Get_Temp();

if(temperature<0)

{

LCD_ShowChar(30+40,150,'-',16,0); //显示负号

temperature=-temperature; //转为正数

}else LCD_ShowChar(30+40,150,' ',16,0); //去掉负号

LCD_ShowNum(30+40+8,150,temperature/10,2,16); //显示正数部分

LCD_ShowNum(30+40+32,150,temperature%10,1,16); //显示小数部分

}

delay_ms(10);

t++;

if(t==20)

{

t=0;

LED0=!LED0;

}

}

}