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driver_htu21d.c
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/**
* Copyright (c) 2015 - present LibDriver All rights reserved
*
* The MIT License (MIT)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* @file driver_htu21d.c
* @brief driver htu21d source file
* @version 1.0.0
* @author Shifeng Li
* @date 2022-10-31
*
* <h3>history</h3>
* <table>
* <tr><th>Date <th>Version <th>Author <th>Description
* <tr><td>2022/10/31 <td>1.0 <td>Shifeng Li <td>first upload
* </table>
*/
#include "driver_htu21d.h"
/**
* @brief chip information definition
*/
#define CHIP_NAME "TE HTU21D" /**< chip name */
#define MANUFACTURER_NAME "TE" /**< manufacturer name */
#define SUPPLY_VOLTAGE_MIN 1.5f /**< chip min supply voltage */
#define SUPPLY_VOLTAGE_MAX 3.6f /**< chip max supply voltage */
#define MAX_CURRENT 0.5f /**< chip max current */
#define TEMPERATURE_MIN -40.0f /**< chip min operating temperature */
#define TEMPERATURE_MAX 125.0f /**< chip max operating temperature */
#define DRIVER_VERSION 1000 /**< driver version */
/**
* @brief chip address definition
*/
#define HTU21D_ADDRESS 0x80 /**< iic device address */
/**
* @brief chip command definition
*/
#define HTU21D_COMMAND_TRIG_TEMP_HOLD_MASTER 0xE3 /**< trigger temperature measurement with hold master command */
#define HTU21D_COMMAND_TRIG_HUMI_HOLD_MASTER 0xE5 /**< trigger humidity measurement with hold master command */
#define HTU21D_COMMAND_TRIG_TEMP_NO_HOLD_MASTER 0xF3 /**< trigger temperature measurement command */
#define HTU21D_COMMAND_TRIG_HUMI_NO_HOLD_MASTER 0xF5 /**< trigger humidity measurement command */
#define HTU21D_COMMAND_WRITE_USER_REGISTER 0xE6 /**< write user register command */
#define HTU21D_COMMAND_READ_USER_REGISTER 0xE7 /**< read user register command */
#define HTU21D_COMMAND_SOFT_RESET 0xFE /**< soft reset command */
/**
* @brief write command
* @param[in] *handle pointer to an htu21d handle structure
* @param[in] *buf pointer to a data buffer
* @param[in] len data length
* @return status code
* - 0 success
* - 1 write failed
* @note none
*/
static uint8_t a_htu21d_write_cmd(htu21d_handle_t *handle, uint8_t *buf, uint16_t len)
{
if (handle->iic_write_cmd(HTU21D_ADDRESS, buf, len) != 0) /* iic write */
{
return 1; /* return error */
}
else
{
return 0; /* success return 0 */
}
}
/**
* @brief read command
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *buf pointer to a data buffer
* @param[in] len data length
* @return status code
* - 0 success
* - 1 read failed
* @note none
*/
static uint8_t a_htu21d_read_cmd(htu21d_handle_t *handle, uint8_t *buf, uint16_t len)
{
if (handle->iic_read_cmd(HTU21D_ADDRESS, buf, len) != 0) /* iic read */
{
return 1; /* return error */
}
else
{
return 0; /* success return 0 */
}
}
/**
* @brief write bytes
* @param[in] *handle pointer to an htu21d handle structure
* @param[in] reg iic register address
* @param[in] *buf pointer to a data buffer
* @param[in] len data length
* @return status code
* - 0 success
* - 1 write failed
* @note none
*/
static uint8_t a_htu21d_write(htu21d_handle_t *handle, uint8_t reg, uint8_t *buf, uint16_t len)
{
if (handle->iic_write(HTU21D_ADDRESS, reg, buf, len) != 0) /* iic write */
{
return 1; /* return error */
}
else
{
return 0; /* success return 0 */
}
}
/**
* @brief read bytes
* @param[in] *handle pointer to an htu21d handle structure
* @param[in] mode read mode
* @param[in] reg iic register address
* @param[out] *buf pointer to a data buffer
* @param[in] len data length
* @return status code
* - 0 success
* - 1 read failed
* @note none
*/
static uint8_t a_htu21d_read(htu21d_handle_t *handle, uint8_t mode, uint8_t reg, uint8_t *buf, uint16_t len)
{
if (mode == HTU21D_MODE_HOLD_MASTER) /* hold master */
{
if (handle->iic_read_with_scl(HTU21D_ADDRESS, reg, buf, len) != 0) /* iic read */
{
return 1; /* return error */
}
else
{
return 0; /* success return 0 */
}
}
else /* no hold master */
{
if (handle->iic_read(HTU21D_ADDRESS, reg, buf, len) != 0) /* iic read */
{
return 1; /* return error */
}
else
{
return 0; /* success return 0 */
}
}
}
/**
* @brief check the crc
* @param[in] value input value
* @param[in] crc checked crc
* @return status code
* - 0 pass
* - 1 error
* @note none
*/
static uint8_t a_htu21d_crc(uint16_t value, uint32_t crc)
{
uint32_t polynom = 0x988000U;
uint32_t msb = 0x800000U;
uint32_t mask = 0xFF8000U;
uint32_t result = (uint32_t)value << 8;
while (msb != 0x80) /* check the msb */
{
if ((result & msb) != 0) /* check the result */
{
result = ((result ^ polynom) & mask) | (result & (~mask)); /* get the new result */
}
msb >>= 1; /* right shift 1 */
mask >>= 1; /* right shift 1 */
polynom >>= 1; /* right shift 1 */
}
if (result == crc) /* check the result */
{
return 0; /* success return 0 */
}
else
{
return 1; /* return error */
}
}
/**
* @brief set the chip mode
* @param[in] *handle pointer to an htu21d handle structure
* @param[in] mode chip mode
* @return status code
* - 0 success
* - 1 set mode failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_set_mode(htu21d_handle_t *handle, htu21d_mode_t mode)
{
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
handle->mode = mode; /* set the mode */
return 0; /* success return 0 */
}
/**
* @brief get the chip mode
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *mode pointer to a chip mode buffer
* @return status code
* - 0 success
* - 1 get mode failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_get_mode(htu21d_handle_t *handle, htu21d_mode_t *mode)
{
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
*mode = (htu21d_mode_t)(handle->mode); /* get the mode */
return 0; /* success return 0 */
}
/**
* @brief soft reset
* @param[in] *handle pointer to an htu21d handle structure
* @return status code
* - 0 success
* - 1 soft reset failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_soft_reset(htu21d_handle_t *handle)
{
uint8_t res;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_write(handle, HTU21D_COMMAND_SOFT_RESET, NULL, 0); /* soft reset */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write failed.\n"); /* write failed */
return 1; /* return error */
}
handle->delay_ms(15); /* delay 15 ms */
return 0; /* success return 0 */
}
/**
* @brief read the temperature and humidity data
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *temperature_raw pointer to a raw temperature buffer
* @param[out] *temperature_s pointer to a converted temperature buffer
* @param[out] *humidity_raw pointer to a raw humidity buffer
* @param[out] *humidity_s pointer to a converted humidity buffer
* @return status code
* - 0 success
* - 1 read temperature humidity failed
* - 2 handle is NULL
* - 3 handle is not initialized
* - 4 crc is error
* - 5 status is error
* @note none
*/
uint8_t htu21d_read_temperature_humidity(htu21d_handle_t *handle,
uint16_t *temperature_raw, float *temperature_s,
uint16_t *humidity_raw, float *humidity_s
)
{
uint8_t res;
uint8_t buf[3];
uint8_t status;
uint16_t data;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
if (handle->mode == HTU21D_MODE_HOLD_MASTER) /* hold master mode */
{
res = a_htu21d_read(handle, HTU21D_MODE_HOLD_MASTER,
HTU21D_COMMAND_TRIG_TEMP_HOLD_MASTER, buf, 3); /* read temperature */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x00) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*temperature_raw = data; /* copy data */
res = a_htu21d_read(handle, HTU21D_MODE_HOLD_MASTER,
HTU21D_COMMAND_TRIG_HUMI_HOLD_MASTER, buf, 3); /* read humidity */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x02) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*humidity_raw = data; /* copy data */
}
else /* no hold master mode */
{
uint8_t cmd;
cmd = HTU21D_COMMAND_TRIG_TEMP_NO_HOLD_MASTER; /* read temperature */
res = a_htu21d_write_cmd(handle, &cmd, 1); /* write the command */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write cmd failed.\n"); /* write cmd failed */
return 1; /* return error */
}
if (handle->resolution == HTU21D_RESOLUTION_TEMP_11_BITS_RH_11_BITS) /* temp 11 bits and rh 11 bits */
{
handle->delay_ms(7); /* delay 7 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_12_BITS_RH_8_BITS) /* temp 12 bits and rh 8 bits */
{
handle->delay_ms(13); /* delay 13 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_13_BITS_RH_10_BITS) /* temp 13 bits and rh 10 bits */
{
handle->delay_ms(25); /* delay 25 ms */
}
else /* temp 14 bits and rh 12 bits */
{
handle->delay_ms(50); /* delay 50 ms */
}
res = a_htu21d_read_cmd(handle, buf, 3);
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read cmd failed.\n"); /* read cmd failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x00) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*temperature_raw = data; /* copy data */
cmd = HTU21D_COMMAND_TRIG_HUMI_NO_HOLD_MASTER; /* read humidity */
res = a_htu21d_write_cmd(handle, &cmd, 1); /* write the command */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write cmd failed.\n"); /* write cmd failed */
return 1; /* return error */
}
if (handle->resolution == HTU21D_RESOLUTION_TEMP_11_BITS_RH_11_BITS) /* temp 11 bits and rh 11 bits */
{
handle->delay_ms(7); /* delay 7 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_12_BITS_RH_8_BITS) /* temp 12 bits and rh 8 bits */
{
handle->delay_ms(13); /* delay 13 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_13_BITS_RH_10_BITS) /* temp 13 bits and rh 10 bits */
{
handle->delay_ms(25); /* delay 25 ms */
}
else /* temp 14 bits and rh 12 bits */
{
handle->delay_ms(50); /* delay 50 ms */
}
res = a_htu21d_read_cmd(handle, buf, 3);
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read cmd failed.\n"); /* read cmd failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x02) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*humidity_raw = data; /* copy data */
}
*temperature_s = (float)(*temperature_raw) / 65536.0f * 175.72f - 46.85f; /* convert raw temperature */
*humidity_s = (float)(*humidity_raw) / 65536.0f * 125.0f - 6.0f; /* convert raw humidity */
return 0; /* success return 0 */
}
/**
* @brief read the temperature data
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *temperature_raw pointer to a raw temperature buffer
* @param[out] *temperature_s pointer to a converted temperature buffer
* @return status code
* - 0 success
* - 1 read temperature failed
* - 2 handle is NULL
* - 3 handle is not initialized
* - 4 crc is error
* - 5 status is error
* @note none
*/
uint8_t htu21d_read_temperature(htu21d_handle_t *handle, uint16_t *temperature_raw, float *temperature_s)
{
uint8_t res;
uint8_t buf[3];
uint8_t status;
uint16_t data;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
if (handle->mode == HTU21D_MODE_HOLD_MASTER) /* hold master mode */
{
res = a_htu21d_read(handle, HTU21D_MODE_HOLD_MASTER,
HTU21D_COMMAND_TRIG_TEMP_HOLD_MASTER, buf, 3); /* read temperature */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x00) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*temperature_raw = data; /* copy data */
}
else /* no hold master mode */
{
uint8_t cmd;
cmd = HTU21D_COMMAND_TRIG_TEMP_NO_HOLD_MASTER; /* read temperature */
res = a_htu21d_write_cmd(handle, &cmd, 1); /* write the command */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write cmd failed.\n"); /* write cmd failed */
return 1; /* return error */
}
if (handle->resolution == HTU21D_RESOLUTION_TEMP_11_BITS_RH_11_BITS) /* temp 11 bits and rh 11 bits */
{
handle->delay_ms(7); /* delay 7 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_12_BITS_RH_8_BITS) /* temp 12 bits and rh 8 bits */
{
handle->delay_ms(13); /* delay 13 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_13_BITS_RH_10_BITS) /* temp 13 bits and rh 10 bits */
{
handle->delay_ms(25); /* delay 25 ms */
}
else /* temp 14 bits and rh 12 bits */
{
handle->delay_ms(50); /* delay 50 ms */
}
res = a_htu21d_read_cmd(handle, buf, 3);
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read cmd failed.\n"); /* read cmd failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x00) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*temperature_raw = data; /* copy data */
}
*temperature_s = (float)(*temperature_raw) / 65536.0f * 175.72f - 46.85f; /* convert raw temperature */
return 0; /* success return 0 */
}
/**
* @brief read the humidity data
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *humidity_raw pointer to a raw humidity buffer
* @param[out] *humidity_s pointer to a converted humidity buffer
* @return status code
* - 0 success
* - 1 read humidity failed
* - 2 handle is NULL
* - 3 handle is not initialized
* - 4 crc is error
* - 5 status is error
* @note none
*/
uint8_t htu21d_read_humidity(htu21d_handle_t *handle, uint16_t *humidity_raw, float *humidity_s)
{
uint8_t res;
uint8_t buf[3];
uint8_t status;
uint16_t data;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
if (handle->mode == HTU21D_MODE_HOLD_MASTER) /* hold master mode */
{
res = a_htu21d_read(handle, HTU21D_MODE_HOLD_MASTER,
HTU21D_COMMAND_TRIG_HUMI_HOLD_MASTER, buf, 3); /* read humidity */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x02) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*humidity_raw = data; /* copy data */
}
else /* no hold master mode */
{
uint8_t cmd;
cmd = HTU21D_COMMAND_TRIG_HUMI_NO_HOLD_MASTER; /* read humidity */
res = a_htu21d_write_cmd(handle, &cmd, 1); /* write the command */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write cmd failed.\n"); /* write cmd failed */
return 1; /* return error */
}
if (handle->resolution == HTU21D_RESOLUTION_TEMP_11_BITS_RH_11_BITS) /* temp 11 bits and rh 11 bits */
{
handle->delay_ms(7); /* delay 7 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_12_BITS_RH_8_BITS) /* temp 12 bits and rh 8 bits */
{
handle->delay_ms(13); /* delay 13 ms */
}
else if (handle->resolution == HTU21D_RESOLUTION_TEMP_13_BITS_RH_10_BITS) /* temp 13 bits and rh 10 bits */
{
handle->delay_ms(25); /* delay 25 ms */
}
else /* temp 14 bits and rh 12 bits */
{
handle->delay_ms(50); /* delay 50 ms */
}
res = a_htu21d_read_cmd(handle, buf, 3);
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read cmd failed.\n"); /* read cmd failed */
return 1; /* return error */
}
data = ((uint16_t)buf[0] << 8) | buf[1]; /* get the raw data */
if (a_htu21d_crc(data, buf[2]) != 0) /* check the crc */
{
handle->debug_print("htu21d: crc is error.\n"); /* crc is error */
return 4; /* return error */
}
status = data & 0x3; /* get the status */
if (status != 0x02) /* check the status */
{
handle->debug_print("htu21d: status is error.\n"); /* status is error */
return 5; /* return error */
}
*humidity_raw = data; /* copy data */
}
*humidity_s = (float)(*humidity_raw) / 65536.0f * 125.0f - 6.0f; /* convert raw humidity */
return 0; /* success return 0 */
}
/**
* @brief set the resolution
* @param[in] *handle pointer to an htu21d handle structure
* @param[in] resolution chip resolution
* @return status code
* - 0 success
* - 1 set resolution failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_set_resolution(htu21d_handle_t *handle, htu21d_resolution_t resolution)
{
uint8_t res;
uint8_t prev;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_read(handle, HTU21D_MODE_NO_HOLD_MASTER,
HTU21D_COMMAND_READ_USER_REGISTER, &prev, 1); /* read config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
prev &= ~(1 << 7); /* clear bit 7 */
prev &= ~(1 << 0); /* clear bit 0 */
prev |= ((resolution >> 1) & 0x01) << 7; /* set bit 7 */
prev |= ((resolution >> 0) & 0x01) << 0; /* set bit 0 */
res = a_htu21d_write(handle, HTU21D_COMMAND_WRITE_USER_REGISTER, &prev, 1); /* write config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write failed.\n"); /* write failed */
return 1; /* return error */
}
return 0; /* success return 0 */
}
/**
* @brief get the resolution
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *resolution pointer to a resolution buffer
* @return status code
* - 0 success
* - 1 get resolution failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_get_resolution(htu21d_handle_t *handle, htu21d_resolution_t *resolution)
{
uint8_t res;
uint8_t prev;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_read(handle, HTU21D_MODE_NO_HOLD_MASTER,
HTU21D_COMMAND_READ_USER_REGISTER, &prev, 1); /* read config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
*resolution = (htu21d_resolution_t)((((prev >> 7) & 0x01) << 1)
| (((prev >> 0) & 0x01) << 0)); /* get the resolution */
handle->resolution = *resolution; /* save the resolution */
return 0; /* success return 0 */
}
/**
* @brief get the battery status
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *status pointer to a status buffer
* @return status code
* - 0 success
* - 1 get battery status failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_get_battery_status(htu21d_handle_t *handle, htu21d_status_t *status)
{
uint8_t res;
uint8_t prev;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_read(handle, HTU21D_MODE_NO_HOLD_MASTER,
HTU21D_COMMAND_READ_USER_REGISTER, &prev, 1); /* read config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
*status = (htu21d_status_t)((prev >> 6) & 0x01); /* get the status */
return 0; /* success return 0 */
}
/**
* @brief enable or disable the heater
* @param[in] *handle pointer to an htu21d handle structure
* @param[in] enable bool value
* @return status code
* - 0 success
* - 1 set heater failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_set_heater(htu21d_handle_t *handle, htu21d_bool_t enable)
{
uint8_t res;
uint8_t prev;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_read(handle, HTU21D_MODE_NO_HOLD_MASTER,
HTU21D_COMMAND_READ_USER_REGISTER, &prev, 1); /* read config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
prev &= ~(1 << 2); /* clear bit 2 */
prev |= enable << 2; /* set the bool */
res = a_htu21d_write(handle, HTU21D_COMMAND_WRITE_USER_REGISTER, &prev, 1); /* write config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write failed.\n"); /* write failed */
return 1; /* return error */
}
return 0; /* success return 0 */
}
/**
* @brief get the heater status
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *enable pointer to a bool value buffer
* @return status code
* - 0 success
* - 1 get heater failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_get_heater(htu21d_handle_t *handle, htu21d_bool_t *enable)
{
uint8_t res;
uint8_t prev;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_read(handle, HTU21D_MODE_NO_HOLD_MASTER,
HTU21D_COMMAND_READ_USER_REGISTER, &prev, 1); /* read config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
*enable = (htu21d_bool_t)((prev >> 2) & 0x01); /* set the bool */
return 0; /* success return 0 */
}
/**
* @brief enable or disable otp reload
* @param[in] *handle pointer to an htu21d handle structure
* @param[in] enable bool value
* @return status code
* - 0 success
* - 1 set disable otp reload failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_set_disable_otp_reload(htu21d_handle_t *handle, htu21d_bool_t enable)
{
uint8_t res;
uint8_t prev;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_read(handle, HTU21D_MODE_NO_HOLD_MASTER,
HTU21D_COMMAND_READ_USER_REGISTER, &prev, 1); /* read config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */
}
prev &= ~(1 << 1); /* clear bit 1 */
prev |= enable << 1; /* set the bool */
res = a_htu21d_write(handle, HTU21D_COMMAND_WRITE_USER_REGISTER, &prev, 1); /* write config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: write failed.\n"); /* write failed */
return 1; /* return error */
}
return 0; /* success return 0 */
}
/**
* @brief get the disable otp reload status
* @param[in] *handle pointer to an htu21d handle structure
* @param[out] *enable pointer to a bool value buffer
* @return status code
* - 0 success
* - 1 get disable otp reload failed
* - 2 handle is NULL
* - 3 handle is not initialized
* @note none
*/
uint8_t htu21d_get_disable_otp_reload(htu21d_handle_t *handle, htu21d_bool_t *enable)
{
uint8_t res;
uint8_t prev;
if (handle == NULL) /* check handle */
{
return 2; /* return error */
}
if (handle->inited != 1) /* check handle initialization */
{
return 3; /* return error */
}
res = a_htu21d_read(handle, HTU21D_MODE_NO_HOLD_MASTER,
HTU21D_COMMAND_READ_USER_REGISTER, &prev, 1); /* read config */
if (res != 0) /* check the result */
{
handle->debug_print("htu21d: read failed.\n"); /* read failed */
return 1; /* return error */