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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 ```
92 lines
2.3 KiB
C
92 lines
2.3 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 sys_auto_init_saul
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* @{
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*
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* @file
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* @brief Auto initialization of Si70xx driver.
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*
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* @author Bas Stottelaar <basstottelaar@gmail.com>
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*
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* @}
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*/
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#include "assert.h"
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#include "log.h"
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#include "saul_reg.h"
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#include "si70xx.h"
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#include "si70xx_params.h"
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/**
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* @brief Define the number of configured sensors
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*/
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#define SI70XX_NUM ARRAY_SIZE(si70xx_params)
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/**
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* @brief Define the number of SAUL registry entries
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*/
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#if SI70XX_HAS_HUMIDITY_SENSOR
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#define SI70XX_SAUL_ENTRIES_NUM 2
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#else
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#define SI70XX_SAUL_ENTRIES_NUM 1
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#endif
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/**
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* @brief Allocation of memory for device descriptors
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*/
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static si70xx_t si70xx_devs[SI70XX_NUM];
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/**
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* @brief Memory for the SAUL registry entries
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*/
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static saul_reg_t saul_entries[SI70XX_NUM * SI70XX_SAUL_ENTRIES_NUM];
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/**
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* @brief Define the number of saul info
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*/
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#define SI70XX_INFO_NUM ARRAY_SIZE(si70xx_saul_info)
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/**
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* @name Reference the driver structs.
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* @{
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*/
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extern const saul_driver_t si70xx_temperature_saul_driver;
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extern const saul_driver_t si70xx_relative_humidity_saul_driver;
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/** @} */
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void auto_init_si70xx(void)
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{
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assert(SI70XX_INFO_NUM == SI70XX_NUM);
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unsigned entry = 0;
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for (unsigned i = 0; i < SI70XX_NUM; i++) {
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LOG_DEBUG("[auto_init_saul] initializing SI70xx #%u\n", i);
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if (si70xx_init(&si70xx_devs[i], &si70xx_params[i]) != SI70XX_OK) {
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LOG_ERROR("[auto_init_saul] error initializing SI70xx #%i\n", i);
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continue;
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}
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/* temperature */
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saul_entries[entry].dev = &si70xx_devs[i];
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saul_entries[entry].name = si70xx_saul_info[i].name;
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saul_entries[entry].driver = &si70xx_temperature_saul_driver;
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saul_reg_add(&saul_entries[entry++]);
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#if SI70XX_HAS_HUMIDITY_SENSOR
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/* relative humidity */
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saul_entries[entry].dev = &si70xx_devs[i];
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saul_entries[entry].name = si70xx_saul_info[i].name;
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saul_entries[entry].driver = &si70xx_relative_humidity_saul_driver;
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saul_reg_add(&saul_entries[entry++]);
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#endif /* SI70XX_HAS_HUMIDITY_SENSOR */
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}
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}
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