plik I2C.C
[syntax=c]#include "main.h"
/* I2C init */
void I2Cinit(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB);
/* Enable clock for alternative functions */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
/* Enable clock for I2C1 */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
GPIO_InitTypeDef gpio;
I2C_InitTypeDef i2c;
/* init GPIO stricture for SDA & SCL */
GPIO_StructInit(&gpio);
gpio.GPIO_Pin = I2C1_SDA_PINx | I2C1_SCL_PINx;
/* Outputs must be Open Drain - no pullup ! */
gpio.GPIO_Mode = GPIO_Mode_AF_OD;
gpio.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(I2C1_REGx, &gpio);
/* init I2C structure */
I2C_StructInit(&i2c);
i2c.I2C_Mode = I2C_Mode_I2C;
/* 100 kHz speed - max 400 kHz but depends on wire's length */
/* the longer wires are, the lowest speed shuold be used*/
/* to avoid transmission errors */
i2c.I2C_ClockSpeed = 100000;
I2C_Init(I2C1, &i2c);
I2C_Cmd(I2C1, ENABLE);
}
/* I2C start */
void i2c_start(void)
{
I2C_GenerateSTART(I2C1, ENABLE);
while (I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT) != SUCCESS);
}
/* I2C send address */
void i2c_write_addr(uint8_t addr, I2C_Dir_T mode)
{
switch(mode)
{
case I2C_WriteData:
{
I2C_Send7bitAddress(I2C1, addr, I2C_Direction_Transmitter);
while (I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) != SUCCESS);
break;
}
case I2C_ReadData:
{
I2C_Send7bitAddress(I2C1, addr, I2C_Direction_Receiver);
while (I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) != SUCCESS);
break;
}
default:
break;
}
}
/* I2C write */
void i2c_write_byte(uint8_t data)
{
I2C_SendData(I2C1, data);
while (I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTING) != SUCCESS);
}
/* I2C read byte */
uint8_t i2c_read_byte(void)
{
while(I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED) != SUCCESS);
return I2C_ReceiveData(I2C1);
}
/* I2C stop */
void i2c_stop(void)
{
I2C_GenerateSTOP(I2C1, ENABLE);
}[/syntax]
plik I2C.H
[syntax=c]#ifndef I2C_H_
#define I2C_H_
#define I2C1_SDA_PINx(GPIO_Pin_7)
#define I2C1_SCL_PINx(GPIO_Pin_6)
#defineI2C1_REGx(GPIOB)
typedef enum I2C_Dir_Tag
{
I2C_WriteData,
I2C_ReadData
} I2C_Dir_T;
void I2Cinit(void);
void i2c_start(void);
void i2c_stop(void);
uint8_t i2c_read_byte(void);
void i2c_write_byte(uint8_t data);
void i2c_write_addr(uint8_t addr, I2C_Dir_T mode);
#endif /* I2C_H_ */[/syntax]
plik HIH6030.C
[syntax=c]#include "main.h"
uint8_t buffer[2];
static void _hih_request_measurement(void)
{
i2c_start();
i2c_write_byte( (HIH6030_ADDR) << 1 );
i2c_stop();
_delay_ms(50);
}
void hih_read_temp(void)
{
uint16_t HumidBuffer[2];
uint16_t TemperatureBuffer[2];
uint8_t lsbHumid, msbHumid, lsbTemp, msbTemp;
long temperature, humidity;
long conv_temp, conv_humid;
/* request measurement */
_hih_request_measurement();
i2c_start();
I2C_AcknowledgeConfig(I2C1, ENABLE);
i2c_write_byte( (HIH6030_ADDR << 1) | 0x01 );
HumidBuffer[0] = i2c_read_byte();
HumidBuffer[1] = i2c_read_byte();
TemperatureBuffer[0] = i2c_read_byte();
TemperatureBuffer[1] = i2c_read_byte();
I2C_AcknowledgeConfig(I2C1, DISABLE);
i2c_stop();
/* humidity conversion */
msbHumid = (HumidBuffer[0] & 0x3F);
lsbHumid = HumidBuffer[1];
humidity = (msbHumid << 8) | lsbHumid;
conv_humid = (humidity * 100) >> 14;
/* temperature conversion */
msbTemp = TemperatureBuffer[0];
lsbTemp = TemperatureBuffer[1];
temperature = ( (msbTemp << 6) | (lsbTemp >> 2) );
conv_temp = ( (temperature * 165) >> 14 ) - 40;
}[/syntax]
plik HIH_6030.H
[syntax=c]#ifndef BMP180_H_
#define BMP180_H_
#define HIH6030_ADDR(0x27)
void hih_read_temp(void);
#endif /* HIH6030_H_ */[/syntax]
------------------------ [ Dodano po: 3 minutach ]
P.S. Dodaję zdj schematu
linie SDA i SCL są podłączone do pinów PB7 i PB6
Statystyki: Napisane przez kubavit — 10 lut 2016, o 14:32
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