本帖最后由 hugo0chen 于 2017-3-29 20:00 编辑
#include "dht12.h"
#include "i2c.h"
#define I2C_CLOCK 300000
#define I2C_OWN_ADDR 0xC5 //STM i2c address
/*************************************************************
*************************************************************/
static void init_I2C_InitStructure(void)
{
I2C_InitTypeDef I2C_InitStructure;
I2C_DeInit(I2C2);
I2C_InitStructure.I2C_ClockSpeed = I2C_CLOCK;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_OwnAddress1 = I2C_OWN_ADDR;
I2C_Init(I2C2, &I2C_InitStructure);
I2C_Cmd(I2C2, ENABLE);
I2C_AcknowledgeConfig(I2C2, ENABLE);
}
void inti_I2C2(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd (RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
// GPIO_PinAFConfig(GPIOB, GPIO_Pin_10, GPIO_AF_I2C2);
// GPIO_PinAFConfig(GPIOB, GPIO_Pin_11, GPIO_AF_I2C2);
GPIOB->AFR[1] |= 0x00000400;
GPIOB->AFR[1] |= 0x00004000;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
init_I2C_InitStructure();
}
uint32_t I2CTimeout;
#define WIAT_FOR_FLAG(flag, value, timeout, errorcode) I2CTimeout = timeout;\ while(I2C_CheckEvent(I2C2,flag) != value )\
{ if((I2CTimeout--) == 0)\
return I2Cx_TIMEOUT_UserCallback(errorcode);}
/*************************************************************
*************************************************************/
static uint8_t I2Cx_TIMEOUT_UserCallback(uint8_t errorcode){
I2C_GenerateSTOP(I2C2, ENABLE);
I2C_SoftwareResetCmd(I2C2, ENABLE);
I2C_SoftwareResetCmd(I2C2, DISABLE);
init_I2C_InitStructure();
return 1;
}
#define WAIT_FLAG_TIME 200
#define LONG_WAIT_**A_TIME (10*WAIT_FLAG_TIME)
static uint8_t Convert_DHT12(struct dht12_Reg_Data* reg_data)
{
uint8_t id;
uint8_t point[4];
//------WRITE Operation-----
WIAT_FOR_FLAG(I2C_FLAG_BUSY, RESET,LONG_WAIT_**A_TIME,1);
// Start
I2C_GenerateSTART(I2C2, ENABLE);
//Test On EV5 and clear it
WIAT_FOR_FLAG(I2C_EVENT_MASTER_MODE_SELECT, SET,WAIT_FLAG_TIME,2);
//Dev SEL
I2C_Send7bitAddress(I2C2, DHT12_ADDR, I2C_Direction_Transmitter);
WIAT_FOR_FLAG(I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED, SET,LONG_WAIT_**A_TIME,3);
//Send Byte Addr
I2C_SendData(I2C2, REG_HUMIDITY_HIGH);
WIAT_FOR_FLAG(I2C_EVENT_MASTER_BYTE_TRANSMITTED, SET,LONG_WAIT_**A_TIME,4);
//-------READ Operation------
I2C_GenerateSTART(I2C2, ENABLE);
WIAT_FOR_FLAG(I2C_EVENT_MASTER_MODE_SELECT, SET,WAIT_FLAG_TIME,5);
I2C_Send7bitAddress(I2C2, DHT12_ADDR, I2C_Direction_Receiver);
// Read Data
for( id = 0;id < 4;id++)
{
WIAT_FOR_FLAG(I2C_EVENT_MASTER_BYTE_RECEIVED, SET,LONG_WAIT_**A_TIME,6);
point[id] = I2C_ReceiveData(I2C2);
}
I2C_AcknowledgeConfig(I2C2, DISABLE);
WIAT_FOR_FLAG(I2C_EVENT_MASTER_BYTE_RECEIVED, SET,LONG_WAIT_**A_TIME,6);
reg_data->cal_value = I2C_ReceiveData(I2C2);
reg_data->humi_high = point[0];
reg_data->humi_low = point[1];
reg_data->temperature_high = point[2];
reg_data->temperature_low = point[3];
I2C_GenerateSTOP(I2C2, ENABLE);
I2C_AcknowledgeConfig(I2C2, ENABLE);
return 0;
}
uint8_t getDHT12_Temp_Humi(float* temperature, float* huminity)
{
uint8_t temp_cal = 0;
float getTemp = 0.0, getHumi = 0.0;
struct dht12_Reg_Data data;
Convert_DHT12(&data);
temp_cal = (uint8_t)(data.humi_high + data.humi_low + data.temperature_high + data.temperature_low);//ֻȡµÍ8λ
if(data.cal_value == temp_cal)
{
getHumi = data.humi_high*10 + data.humi_low;
if(data.temperature_low&0X80)
{
getTemp = 0 - (data.temperature_high*10 + ((data.temperature_low&0x7F)));
}
else
{
getTemp=data.temperature_high*10+data.temperature_low;
}
if(getHumi > 950)
{
getHumi = 950;
}
else if(getHumi < 200)
{
getHumi = 200;
}
if(getTemp > 600)
{
getTemp = 600;
}
else if(getTemp < -200)
{
getTemp = -200;
}
*temperature = getTemp/10.0;
*huminity = getHumi/10.0;
}
else
{
return 1;
}
return 0;
}
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