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f72efb1daf
The Silicon Labs Si705x sensors (Si7050/1/3/4/5) are very similar to the Si7021 sensors featuring only a temperature sensor and no humidity sensor. The only difference between the Si705x is the temperature accuracy of the reading, ranging from +/- 0.1 C in the Si7051 to +/- 1 C in the Si7050. This patch adds support for this family of sensors extending the functionality of the existing si70xx driver. Following the style of other modules, this implements a pseudomodule per supported chip, adding si7050, si7051, si7053, si7054 and si7055 pseudomodules. As a minor change this patch also implements the missing si70xx_get_serial, si70xx_get_id and si70xx_get_revision functions that were declared in the si70xx.h header but implemented as private functions. The si70xx_get_id() may be relevant for the application to know at run time exactly which version of the hardware is installed. The updated test running with a Si7051 shows the following output, which seems consistent with the room temperature conditions during the test. ``` make SI70XX_VARIANT=si7051 -C tests/driver_si70xx/ all flash ``` ``` SI70XX temperature and humidity sensor test application Initializing sensor... [OK] Found SI7051 sensor, revision 32 temperature: 24.71 C temperature: 24.69 C ```
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
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* Copyright (C) 2016 Bas Stottelaar <basstottelaar@gmail.com>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_si70xx
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*
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* @{
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* @file
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* @brief Internal definitions for Si7006/13/20/21
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*
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* @author Bas Stottelaar <basstottelaar@gmail.com>
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*/
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#ifndef SI70XX_INTERNALS_H
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#define SI70XX_INTERNALS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Si70xx chip addresses.
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*/
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#define SI70XX_I2C_ADDRESS (0x40)
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/**
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* @name Si70xx device commands.
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* @{
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*/
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#define SI70XX_MEASURE_RH_HOLD (0xE5)
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#define SI70XX_MEASURE_RH (0xF5)
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#define SI70XX_MEASURE_TEMP_HOLD (0xE3)
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#define SI70XX_MEASURE_TEMP (0xF3)
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#define SI70XX_MEASURE_TEMP_PREV (0xE0)
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#define SI70XX_RESET (0xFE)
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#define SI70XX_WRITE_USER_REG (0xE6)
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#define SI70XX_READ_USER_REG (0xE7)
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#define SI70XX_WRITE_HEATER_REG (0x51)
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#define SI70XX_READ_HEATER_REG (0x11)
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#define SI70XX_READ_ID_FIRST_A (0xFA)
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#define SI70XX_READ_ID_FIRST_B (0x0F)
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#define SI70XX_READ_ID_SECOND_A (0xFC)
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#define SI70XX_READ_ID_SECOND_B (0xC9)
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#define SI70XX_READ_REVISION_A (0x84)
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#define SI70XX_READ_REVISION_B (0xB8)
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/** @} */
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/**
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* @name Si70xx register values.
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* @{
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*/
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#if defined(MODULE_SI7006)
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#define SI70XX_ID (6)
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#elif defined(MODULE_SI7013)
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#define SI70XX_ID (13)
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#elif defined(MODULE_SI7020)
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#define SI70XX_ID (20)
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#elif defined(MODULE_SI7021)
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#define SI70XX_ID (21)
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#elif defined(MODULE_SI7050)
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#define SI70XX_ID (50)
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#elif defined(MODULE_SI7051)
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#define SI70XX_ID (51)
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#elif defined(MODULE_SI7053)
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#define SI70XX_ID (53)
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#elif defined(MODULE_SI7054)
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#define SI70XX_ID (54)
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#elif defined(MODULE_SI7055)
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#define SI70XX_ID (55)
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#else
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#error "Please provide a valid Si70xx variant (Si7006/13/20/21/5X)"
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#endif
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#define SI70XX_REVISION_1 (0xFF)
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#define SI70XX_REVISION_2 (0x20)
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* SI70XX_INTERNALS_H */
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/** @} */
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