113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
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/*
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* Driver for Bosch Sensortec BME680 digital temperature, humidity, pressure
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* and gas sensor connected to I2C or SPI
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*
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* This driver is for the usage with the ESP8266 and FreeRTOS (esp-open-rtos)
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* [https://github.com/SuperHouse/esp-open-rtos]. It is also working with ESP32
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* and ESP-IDF [https://github.com/espressif/esp-idf.git] as well as Linux
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* based systems using a wrapper library for ESP8266 functions.
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*
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* ---------------------------------------------------------------------------
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*
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* The BSD License (3-clause license)
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*
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* Copyright (c) 2017 Gunar Schorcht (https://github.com/gschorcht)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Platform file: platform specific definitions, includes and functions
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*/
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#ifndef __BME680_PLATFORM_H__
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#define __BME680_PLATFORM_H__
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#if !defined(ESP_OPEN_RTOS)
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#define ESP_OPEN_RTOS 1
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#endif
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#ifdef ESP_OPEN_RTOS // ESP8266
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// platform specific includes
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#include "FreeRTOS.h"
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#include "task.h"
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#include "espressif/esp_common.h"
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#include "espressif/sdk_private.h"
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#include "esp/uart.h"
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#include "esp/spi.h"
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#include "i2c/i2c.h"
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// platform specific definitions
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#define spi_semaphore_init()
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#define spi_semaphore_take()
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#define spi_semaphore_give()
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// platform specific SPI functions
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#define spi_bus_init(bus,sck,miso,mosi) // not needed on ESP8266
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static const spi_settings_t bus_settings = {
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.mode = SPI_MODE0,
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.freq_divider = SPI_FREQ_DIV_1M,
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.msb = true,
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.minimal_pins = false,
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.endianness = SPI_LITTLE_ENDIAN
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};
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inline static bool spi_device_init (uint8_t bus, uint8_t cs)
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{
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gpio_enable(cs, GPIO_OUTPUT);
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gpio_write (cs, true);
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return true;
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}
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inline static size_t spi_transfer_pf(uint8_t bus, uint8_t cs, const uint8_t *mosi, uint8_t *miso, uint16_t len)
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{
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spi_settings_t old_settings;
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spi_get_settings(bus, &old_settings);
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spi_set_settings(bus, &bus_settings);
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gpio_write(cs, false);
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size_t transfered = spi_transfer (bus, (const void*)mosi, (void*)miso, len, SPI_8BIT);
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gpio_write(cs, true);
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spi_set_settings(bus, &old_settings);
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return transfered;
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}
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#endif // ESP_OPEN_RTOS
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#endif // __BME680_PLATFORM_H__
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