a29d9ea9da
to get the prototypes or macros are defined in it Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/****************************************************************************
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* apps/examples/powermonitor/powermonitor_main.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <debug.h>
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#include <stdio.h>
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#include <fixedmath.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <nuttx/sensors/ltc4151.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define DECIMAL_PLACES3(x) abs(((int)(((x)-((int)x))*1000)))
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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int main(int argc, char *argv[])
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{
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static FAR const char *pwrmntr_dev = "/dev/pwrmntr0";
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float float_current;
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float float_voltage;
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ltc4151_t ltc;
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int pwrmntr_fd;
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int samples;
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int sample;
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samples = 1;
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if (argc > 1)
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{
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samples = atoi(argv[1]);
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}
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pwrmntr_fd = open(pwrmntr_dev, O_RDONLY);
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if (pwrmntr_fd < 0)
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{
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printf("Failed to open %s: %d\n", pwrmntr_dev, errno);
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return 1;
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}
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for (sample = 0; sample < samples; ++sample)
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{
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if (read(pwrmntr_fd, <c, sizeof(ltc)) < 0)
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{
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printf("Failed to read from %s: %d\n", pwrmntr_dev, errno);
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return 1;
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}
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float_current = b16tof(ltc.current);
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float_voltage = b16tof(ltc.voltage);
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printf("Current: %d.%03dmA - Voltage: %d.%03dV\n",
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(int)float_current, DECIMAL_PLACES3(float_current),
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(int)float_voltage, DECIMAL_PLACES3(float_voltage));
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}
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close(pwrmntr_fd);
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return 0;
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}
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