48 lines
1.8 KiB
C
48 lines
1.8 KiB
C
/** library to query measurements from peacefair PZEM-004 and PZEM-004T electricity meter
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* @file
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @copyright SPDX-License-Identifier: GPL-3.0-or-later
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* @date 2016-2020
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* @note peripherals used: USART @ref sensor_pzem_usart, timer @ref sensor_pzem_timer
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*/
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#pragma once
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/** a measurement response has been received */
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extern volatile bool sensor_pzem_measurement_received;
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/** measurements (and configurations) offered by electricity meter */
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enum sensor_pzem_measurement_type_t {
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SENSOR_PZEM_VOLTAGE = 0,
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SENSOR_PZEM_CURRENT = 1,
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SENSOR_PZEM_POWER = 2,
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SENSOR_PZEM_ENERGY = 3,
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// SENSOR_PZEM_ADDRESS = 4, // this is a setting, not a measurement
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// SENSOR_PZEM_ALARM = 5, // this is a setting, not a measurement
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SENSOR_PZEM_MAX
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};
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/** measurement returned by electricity meter */
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struct sensor_pzem_measurement_t {
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enum sensor_pzem_measurement_type_t type; /**< measurement type */
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bool valid; /**< is the measurement valid (e.g. format and checksum are correct) */
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/** possible measurement values */
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union measurement_t {
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float voltage; /**< measured voltage in volts */
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float current; /**< measured current in amperes */
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uint16_t power; /**< measured power in watts */
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uint32_t energy; /**< measured energy in watts/hour (24 bits) */
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} value; /**< measurement value */
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};
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/** setup peripherals to communicate with electricity meter */
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void sensor_pzem_setup(void);
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/** request measurement from electricity meter
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* @param[in] address electricity meter device address
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* @param[in] type measurement type to request
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*/
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void sensor_pzem_measurement_request(uint32_t address, enum sensor_pzem_measurement_type_t type);
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/** decode received measurement
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* @return decoded measurement (invalid if no new measurement has been received)
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*/
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struct sensor_pzem_measurement_t sensor_pzem_measurement_decode(void);
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