mirror of
https://github.com/eclipse/upm.git
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227 lines
6.9 KiB
C++
227 lines
6.9 KiB
C++
/*
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* Author: Scott Ware <scott.r.ware@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <iostream>
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#include <unistd.h>
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#include <stdlib.h>
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#include <math.h>
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#include <errno.h>
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#include "si1132.hpp"
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#define SI1132_ADDRESS 0x60
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/* REGISTER ADDRESSES */
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#define SI1132_REG_PART_ID 0x00
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#define SI1132_REG_INT_CFG 0x03
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#define SI1132_REG_IRQ_ENABLE 0x04
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#define SI1132_REG_HW_KEY 0x07
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#define SI1132_REG_MEAS_RATE0 0x08
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#define SI1132_REG_MEAS_RATE1 0x09
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#define SI1132_REG_PARAM_WR 0x17
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#define SI1132_REG_COMMAND 0x18
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#define SI1132_REG_RESPONSE 0x20
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#define SI1132_REG_ALS_VIS_DATA0 0x22
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#define SI1132_REG_ALS_VIS_DATA1 0x23
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#define SI1132_REG_PARAM_RD 0x2E
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#define SI1132_REG_CHIP_STAT 0x30
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/* REGISTER VALUES */
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#define SI1132_PART_ID 0x32
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#define SI1132_HW_KEY_INIT 0x17
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/* COMMAND VALUES */
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#define SI1132_COMMAND_RESET 0x01
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#define SI1132_COMMAND_ALS_FORCE 0x06
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#define SI1132_COMMAND_PARAM_QUERY 0x80
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#define SI1132_COMMAND_PARAM_SET 0xA0
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#define SI1132_COMMAND_ALS_AUTO 0x0E
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/* PARAMETER RAM ADDRESSES */
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#define SI1132_PARAM_CHLIST 0x01
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#define SI1132_PARAM_ALS_VIS_ADC_COUNT 0x10
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#define SI1132_PARAM_ALS_VIS_ADC_GAIN 0x11
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#define SI1132_PARAM_ALS_VIS_ADC_MISC 0x12
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/* PARAMETER RAM VALUES */
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#define SI1132_PARAM_CHLIST_ENALSVIS 0x10
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#define SI1132_PARAM_ALS_VIS_RANGE_STD 0x00
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#define SI1132_PARAM_ALS_VIS_RANGE_HI 0x20
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using namespace upm;
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SI1132::SI1132 (int bus) {
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i2c = new mraa::I2c(bus);
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i2c->address(SI1132_ADDRESS);
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// Reset chip to defaults
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status = reset();
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if (status != mraa::SUCCESS)
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throw std::runtime_error(std::string(__FUNCTION__) + ": config failure");
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}
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SI1132::~SI1132() {
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delete i2c;
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}
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mraa::Result SI1132::reset() {
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// Check version
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uint8_t regValue = i2c->readReg(SI1132_REG_PART_ID);
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if (regValue != SI1132_PART_ID) {
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fprintf(stderr, "SI1132: Read ID failed. Data = %02x\n", regValue);
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status = mraa::ERROR_UNSPECIFIED;
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return status;
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}
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// disable automatic updates
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uint16_t rate = 0;
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status = i2c->writeWordReg(SI1132_REG_MEAS_RATE0, rate);
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if (status != mraa::SUCCESS) {
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fprintf(stderr, "SI1132_REG_MEAS_RATE0 failed\n");
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return status;
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}
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// reset device
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status = i2c->writeReg(SI1132_REG_COMMAND, SI1132_COMMAND_RESET);
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if (status != mraa::SUCCESS) {
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fprintf(stderr, "SI1132: Reset failed.\n");
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status = mraa::ERROR_UNSPECIFIED;
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return status;
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}
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sleepMs(30);
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// start state machine
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i2c->writeReg(SI1132_REG_HW_KEY, SI1132_HW_KEY_INIT);
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regValue = i2c->readReg(SI1132_REG_HW_KEY);
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if (regValue != SI1132_HW_KEY_INIT) {
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fprintf(stderr, "Si1132: Did not start\n");
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status = mraa::ERROR_UNSPECIFIED;
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return status;
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}
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status = writeParam(SI1132_PARAM_CHLIST, SI1132_PARAM_CHLIST_ENALSVIS);
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// set visible light range for indoor lighting
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status = writeParam(SI1132_PARAM_ALS_VIS_ADC_MISC, SI1132_PARAM_ALS_VIS_RANGE_STD);
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// set visible light gain to 8
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status = writeParam(SI1132_PARAM_ALS_VIS_ADC_GAIN, 3);
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status = writeParam(SI1132_PARAM_ALS_VIS_ADC_COUNT, 3 << 4);
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return status;
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}
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uint16_t SI1132::getVisibleRaw() {
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status = runCommand(SI1132_COMMAND_ALS_FORCE);
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if (status != mraa::SUCCESS)
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throw std::runtime_error(std::string(__FUNCTION__) + ": command failed");
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return i2c->readWordReg(SI1132_REG_ALS_VIS_DATA0);
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}
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double SI1132::getVisibleLux() {
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uint16_t rawValue = getVisibleRaw();
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if (rawValue < 256)
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rawValue = 0;
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else
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rawValue -= 256;
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return static_cast<double>(rawValue);
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}
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float SI1132::getLuminance() {
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return getVisibleLux();
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}
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mraa::Result SI1132::clearResponseRegister()
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{
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uint8_t regValue = 0xFF;
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status = i2c->writeReg(SI1132_REG_COMMAND, 0);
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if (status != mraa::SUCCESS)
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return status;
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int bytesRead = i2c->readBytesReg(SI1132_REG_RESPONSE, ®Value, 1);
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if (bytesRead == 1 && regValue == 0)
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status = mraa::SUCCESS;
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else
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status = mraa::ERROR_UNSPECIFIED;
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return status;
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}
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mraa::Result SI1132::runCommand(uint8_t command)
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{
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uint8_t response = 0;
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int sleepTimeMs = 5;
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int timeoutMs = 50;
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int waitTimeMs = 0;
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status = clearResponseRegister();
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if (status != mraa::SUCCESS)
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return status;
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status = i2c->writeReg(SI1132_REG_COMMAND, command);
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if (status != mraa::SUCCESS)
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return status;
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while (response == 0 && waitTimeMs < timeoutMs) {
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response = i2c->readReg(SI1132_REG_RESPONSE);
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sleepMs(sleepTimeMs);
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waitTimeMs += sleepTimeMs;
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}
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if (response == 0) {
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status = mraa::ERROR_UNSPECIFIED;
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fprintf(stderr, "Command %d failed\n", command);
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}
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return status;
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}
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mraa::Result SI1132::writeParam(uint8_t param, uint8_t value)
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{
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status = i2c->writeReg(SI1132_REG_PARAM_WR, value);
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if (status != mraa::SUCCESS)
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return status;
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return runCommand(SI1132_COMMAND_PARAM_SET | param);
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}
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mraa::Result SI1132::readParam(uint8_t param, uint8_t* value)
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{
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status = runCommand(SI1132_COMMAND_PARAM_QUERY | param);
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if (status != mraa::SUCCESS)
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return status;
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if (i2c->readBytesReg(SI1132_REG_PARAM_RD, value, 1) != 1)
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status = mraa::ERROR_UNSPECIFIED;
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return status;
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}
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void SI1132::sleepMs(int mseconds)
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{
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struct timespec sleepTime;
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sleepTime.tv_sec = mseconds / 1000; // Number of seconds
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sleepTime.tv_nsec = ( mseconds % 1000 ) * 1000000; // Convert fractional seconds to nanoseconds
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// Iterate nanosleep in a loop until the total sleep time is the original
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// value of the seconds parameter
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while ( ( nanosleep( &sleepTime, &sleepTime ) != 0 ) && ( errno == EINTR ) );
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}
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