kopia lustrzana https://github.com/pimoroni/pimoroni-pico
123 wiersze
4.3 KiB
C++
123 wiersze
4.3 KiB
C++
/*
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* Copyright (c) 2018, Sensirion AG
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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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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of Sensirion AG nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this 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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#include "sensirion_i2c_hal.h"
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#include "sensirion_common.h"
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#include "sensirion_config.h"
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#define SCD4X_I2C_ADDRESS 98
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pimoroni::I2C *__i2c = nullptr;
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/*
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* INSTRUCTIONS
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* ============
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*
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* Implement all functions where they are marked as IMPLEMENT.
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* Follow the function specification in the comments.
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*/
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/**
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* Select the current i2c bus by index.
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* All following i2c operations will be directed at that bus.
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*
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* THE IMPLEMENTATION IS OPTIONAL ON SINGLE-BUS SETUPS (all sensors on the same
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* bus)
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*
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* @param bus_idx Bus index to select
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* @returns 0 on success, an error code otherwise
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*/
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int16_t sensirion_i2c_hal_select_bus(uint8_t bus_idx) {
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/* TODO:IMPLEMENT or leave empty if all sensors are located on one single
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* bus
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*/
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return NOT_IMPLEMENTED_ERROR;
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}
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/**
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* Initialize all hard- and software components that are needed for the I2C
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* communication.
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*/
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void sensirion_i2c_hal_init(pimoroni::I2C *i2c) {
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__i2c = i2c;
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}
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/**
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* Release all resources initialized by sensirion_i2c_hal_init().
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*/
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void sensirion_i2c_hal_free(void) {
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/* TODO:IMPLEMENT or leave empty if no resources need to be freed */
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}
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/**
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* Execute one read transaction on the I2C bus, reading a given number of bytes.
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* If the device does not acknowledge the read command, an error shall be
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* returned.
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*
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* @param address 7-bit I2C address to read from
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* @param data pointer to the buffer where the data is to be stored
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* @param count number of bytes to read from I2C and store in the buffer
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* @returns 0 on success, error code otherwise
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*/
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int8_t sensirion_i2c_hal_read(uint8_t address, uint8_t* data, uint16_t count) {
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int result = __i2c->read_blocking(address, data, count, false);
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return result >= 0 ? 0 : result;
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}
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/**
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* Execute one write transaction on the I2C bus, sending a given number of
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* bytes. The bytes in the supplied buffer must be sent to the given address. If
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* the slave device does not acknowledge any of the bytes, an error shall be
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* returned.
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*
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* @param address 7-bit I2C address to write to
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* @param data pointer to the buffer containing the data to write
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* @param count number of bytes to read from the buffer and send over I2C
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* @returns 0 on success, error code otherwise
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*/
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int8_t sensirion_i2c_hal_write(uint8_t address, const uint8_t* data,
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uint16_t count) {
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int result = __i2c->write_blocking(address, data, count, false);
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return result >= 0 ? 0 : result;
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}
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/**
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* Sleep for a given number of microseconds. The function should delay the
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* execution for at least the given time, but may also sleep longer.
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*
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* Despite the unit, a <10 millisecond precision is sufficient.
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*
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* @param useconds the sleep time in microseconds
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*/
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void sensirion_i2c_hal_sleep_usec(uint32_t useconds) {
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sleep_us(useconds);
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}
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