int sht21_humidity(void)
{
int val;
i2c_enable();
/* For for about 15ms before the SHT11 can be used */
sht21_timer = RTIMER_NOW();
while(RTIMER_CLOCK_LT(RTIMER_NOW(), sht21_timer + (RTIMER_SECOND/1000)*15));
buf[0] = 0xe5;
i2c_transmitinit(0x40, 1, buf);
while(!i2c_transferred()) ;
/* Wait for measurement about 85ms */
sht21_timer = RTIMER_NOW();
while(RTIMER_CLOCK_LT(RTIMER_NOW(), sht21_timer + (RTIMER_SECOND/1000)*85));
i2c_receiveinit(0x40, 3, buf);
while(!i2c_transferred()) ;
val = (int)(buf[0]<<24 | buf[1]<<16 | buf[2]<<8 | buf[3]);
// i2c_disable();
/* return relative humidity * 100 (0.04 % accuracy) */
return (-6.0 + (125.0*((val>>16)&0x0000fffc))/0x10000)*100;
}
/*############################## FIFO COUNT FUNCTION ################################## */
uint16_t mpu9150_FIFO_count(uint8_t *buffer) {
prepareRead(MPU9150_FIFO_COUNT_H);
i2c_receiveinit( MPU9150_I2C_ADDR, 2, buffer ) ;
while(!i2c_transferred()) /* Wait for transfer */ ;
uint16_t fifo_count = ((buffer[0]<<8) | buffer[1]);
printf("FIFO count in bits: %i and in bytes %i\n", fifo_count, fifo_count/8);
return fifo_count / 8;
}
/*############################## GET DATA FUNCTION ################################## */
void mpu9150_get_data(uint8_t *buffer) {
// Poll number of new measurements to read from the FIFO:
//uint8_t set[] = {MPU9150_FIFO_COUNT_H,0};
prepareRead(MPU9150_FIFO_R_W);
i2c_receiveinit( MPU9150_I2C_ADDR, 2, buffer ) ;
while(!i2c_transferred());
uint16_t fifo_count = ((buffer[0]<<8) | buffer[1]);
}
/*######################### GET DATA FUNCTION WITH SIZE ############################## */
void mpu9150_get_data_size(uint8_t *buffer, int size) {
// Poll number of new measurements to read from the FIFO:
prepareRead(MPU9150_FIFO_R_W);
//size = 2;
size = 18;
printf("Prepared FIFO for reading %i bytes...\n",size);
i2c_receiveinit( MPU9150_I2C_ADDR, size, buffer ) ;
while(!i2c_transferred());
uint16_t fifo_count = ((buffer[0]<<8) | buffer[1]);
}
void
accm_read_stream(u8_t reg, u8_t len, u8_t *whereto) {
u8_t rtx = reg;
PRINTFDEBUG("READ_STR %u B from 0x%02X\n", len, reg);
/* transmit the register to start reading from */
i2c_transmitinit(ADXL345_ADDR);
while (i2c_busy());
i2c_transmit_n(1, &rtx);
while (i2c_busy());
/* receive the data */
i2c_receiveinit(ADXL345_ADDR);
while (i2c_busy());
i2c_receive_n(len, whereto);
while (i2c_busy());
}
u8_t
accm_read_reg(u8_t reg) {
u8_t retVal = 0;
u8_t rtx = reg;
PRINTFDEBUG("READ_REG 0x%02X\n", reg);
/* transmit the register to read */
i2c_transmitinit(ADXL345_ADDR);
while (i2c_busy());
i2c_transmit_n(1, &rtx);
while (i2c_busy());
/* receive the data */
i2c_receiveinit(ADXL345_ADDR);
while (i2c_busy());
i2c_receive_n(1, &retVal);
while (i2c_busy());
return retVal;
}
/*---------------------------------------------------------------------------*/
static uint16_t
sht25_read_reg(uint8_t reg)
{
uint8_t buf[] = { 0x00, 0x00 };
uint16_t retval;
uint8_t rtx = reg;
/* transmit the register to read */
i2c_transmitinit(SHT25_ADDR);
while(i2c_busy());
i2c_transmit_n(1, &rtx);
while(i2c_busy());
/* receive the data */
i2c_receiveinit(SHT25_ADDR);
while(i2c_busy());
i2c_receive_n(2, &buf[0]);
while(i2c_busy());
retval = (uint16_t)(buf[0] << 8 | (buf[1]));
return retval;
}
void mma7660_acc(int *x, int *y, int *z)
{
int tmp;
i2c_enable();
/* Read data */
buf[0] = XOUT;
i2c_transmitinit(ADDR, 1, buf);
while(!i2c_transferred()) ;
i2c_receiveinit(ADDR, 3, buf);
while(!i2c_transferred()) ;
i2c_disable();
tmp = (signed char)((buf[0] & 0x20) ? (buf[0] | 0xC0) : (buf[0] & 0x3F));
*x = (tmp*150)/32;
tmp = (signed char)((buf[1] & 0x20) ? (buf[1] | 0xC0) : (buf[1] & 0x3F));
*y = (tmp*150)/32;
tmp = (signed char)((buf[2] & 0x20) ? (buf[2] | 0xC0) : (buf[2] & 0x3F));
*z = (tmp*150)/32;
}
uint8_t
tlc59116_read_reg(uint8_t reg)
{
uint8_t retVal = 0;
uint8_t rtx = reg;
PRINTFDEBUG("READ_REG 0x%02X\n", reg);
/* transmit the register to read */
i2c_transmitinit(TLC59116_ADDR);
while(i2c_busy());
i2c_transmit_n(1, &rtx);
while(i2c_busy());
/* receive the data */
i2c_receiveinit(TLC59116_ADDR);
while(i2c_busy());
i2c_receive_n(1, &retVal);
while(i2c_busy());
return retVal;
}
/*
* Function to return the WHO_AM_I value
* of the mpu9150 chip.
*/
void mpu9150_who_am_i(uint8_t *buffer) {
prepareRead(MPU9150_WHO_AM_I);
i2c_receiveinit( MPU9150_I2C_ADDR, 2, buffer ); //need to receive two bytes, otherwise we get ERROR I2C: Arbitration lost
while(!i2c_transferred()); /* Wait for transfer */
}