sensor_sdm120.c
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/* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* standard libraries */
#include <stdint.h> // standard integer types
#include <stdlib.h> // general utilities
#include <math.h> // mathematical utilities
/* STM32 (including CM3) libraries */
#include <libopencm3/stm32/rcc.h> // real-time control clock library
#include <libopencm3/stm32/gpio.h> // general purpose input output library
#include <libopencm3/stm32/usart.h> // universal synchronous asynchronous receiver transmitter library
#include <libopencm3/stm32/timer.h> // timer utilities
#include <libopencm3/cm3/nvic.h> // interrupt handler
#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
#include "sensor_sdm120.h" // SDM120 electricity meter header and definitions
#include "global.h" // common methods
#define SENSOR_SDM120_USART 3
#define SENSOR_SDM120_REDE_PORT B
#define SENSOR_SDM120_REDE_PIN 12
#define SENSOR_SDM120_TIMER 3
/* input and output ring buffer, indexes, and available memory */
static uint8_t rx_buffer[9] = {0};
static volatile uint8_t rx_used = 0;
static uint8_t tx_buffer[13] = {0};
static volatile uint8_t tx_used = 0;
volatile bool sensor_sdm120_measurement_received = false;
static enum timeout_t {
TIMEOUT_BEGIN = 0,
TIMEOUT_END,
TIMEOUT_BETWEEN,
TIMEOUT_MAX
} timeout;
static uint16_t timeout_times[TIMEOUT_MAX] = {0};
static const uint16_t register_input[] = {
0x0000, // 30001 voltage (in volts)
0x0006, // 30007 current (in amperes)
0x000c, // 30013 active power (in watts)
0x0012, // 30019 apparent power (in volt amperes)
0x0018, // 30025 reactive power (in volt amperes reactive)
0x001e, // 30031 power factor (0-1)
0x0046, // 30071 frequency (in hertz)
0x0048, // 30073 import active energy (in kWh)
0x004a, // 30075 export active energy (in kWh)
0x004c, // 30077 import reactive energy (in kVArh)
0x004e, // 30079 export reactive energy (in kVArh)
0x0156, // 30343 total active energy (in kWh)
0x0158 // 30345 total reactive energy (in kVArh)
};
static const uint16_t register_holding[] = {
0x000c, // relay pulse width (60, 100, or 200 ms)
0x0012, // network parity stop (0: 1 stop bit no parity, 1: one stop bit even parity, 2: one stop bit odd parity, 3: two stop bits no parity)
0x0014, // meter slave address (1-247)
0x001c, // baud rate (0: 2400 bps, 1: 4800 bps, 2: 9600 bps, 5: 1200 bps)
0x0056, // pulse 1 output mode (1: import active energy, 2: import+export active energy, 4: export active energy, 5: import reactive energy, 6: import+export reactive energy, 8: export reactive energy)
0xf900, // time of scroll display (0-30 s)
0xf910, // pulse 1 output (0: 0.001 kWh/imp, 1: 0.01 kWh/imp, 2: 0.1 kWh/imp, 3: 1 kWh/imp)
0xf920 // measurement mode (1: total=import, 2: total=import+export, 3: total=import-export)
};
static uint16_t crc_modbus(uint8_t* buffer, uint8_t size)
{
uint16_t crc = 0xffff; // initial value (for ModBus)
for (uint8_t i=0; i<size; i++) { // go through every byte
crc ^= (uint16_t)buffer[i]; // XOR byte
for (uint8_t b=0; b<8; b++) { // go through every bit
if (crc&0x0001) { // least significant bit is set (we are using the reverse way)
crc = (crc>>1)^0xA001; // // shift to the right (for the next bit) and XOR with (reverse) polynomial
} else {
crc >>= 1; // just shift right (for the next bit)
}
}
}
return crc;
}
void sensor_sdm120_setup(uint32_t baudrate)
{
// enable USART I/O peripheral
rcc_periph_clock_enable(RCC_AFIO); // enable pin alternate function (USART)
rcc_periph_clock_enable(USART_PORT_RCC(SENSOR_SDM120_USART)); // enable clock for USART port peripheral
rcc_periph_clock_enable(USART_RCC(SENSOR_SDM120_USART)); // enable clock for USART peripheral
gpio_set_mode(USART_PORT(SENSOR_SDM120_USART), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, USART_PIN_TX(SENSOR_SDM120_USART)); // setup GPIO pin USART transmit
gpio_set_mode(USART_PORT(SENSOR_SDM120_USART), GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, USART_PIN_RX(SENSOR_SDM120_USART)); // setup GPIO pin USART receive
gpio_clear(USART_PORT(SENSOR_SDM120_USART), USART_PIN_RX(SENSOR_SDM120_USART)); // pull down to avoid noise when not connected (it will be set low by RS485 chip when RO is enabled)
// setup USART parameters for electricity meter
usart_set_baudrate(USART(SENSOR_SDM120_USART), baudrate); // get baud rate by scrolling through the measurements on the electricity meter's screen (default 2400)
usart_set_databits(USART(SENSOR_SDM120_USART), 8);
usart_set_stopbits(USART(SENSOR_SDM120_USART), USART_STOPBITS_1);
usart_set_mode(USART(SENSOR_SDM120_USART), USART_MODE_TX_RX);
usart_set_parity(USART(SENSOR_SDM120_USART), USART_PARITY_NONE); // get parity by scrolling through the measurements on the electricity meter's screen (default none)
usart_set_flow_control(USART(SENSOR_SDM120_USART), USART_FLOWCONTROL_NONE);
nvic_enable_irq(USART_IRQ(SENSOR_SDM120_USART)); // enable the USART interrupt
usart_enable_rx_interrupt(USART(SENSOR_SDM120_USART)); // enable receive interrupt
usart_enable(USART(SENSOR_SDM120_USART)); // enable USART
// setup GPIO
rcc_periph_clock_enable(RCC_GPIO(SENSOR_SDM120_REDE_PORT)); // enable clock for GPIO peripheral
gpio_set_mode(GPIO(SENSOR_SDM120_REDE_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(SENSOR_SDM120_REDE_PIN)); // setup GPIO pin for receiver and driver output enable pin
gpio_clear(GPIO(SENSOR_SDM120_REDE_PORT),GPIO(SENSOR_SDM120_REDE_PIN)); // disable driver output and enable receive output
// setup timer to wait for minimal time before next transmission
rcc_periph_clock_enable(RCC_TIM(SENSOR_SDM120_TIMER)); // enable clock for timer block
timer_reset(TIM(SENSOR_SDM120_TIMER)); // reset timer state
timer_set_mode(TIM(SENSOR_SDM120_TIMER), TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP); // set timer mode, use undivided timer clock,edge alignment (simple count), and count up
timer_one_shot_mode(TIM(SENSOR_SDM120_TIMER)); // stop counter after update event (we only need to count down once)
timer_set_prescaler(TIM(SENSOR_SDM120_TIMER), 66-1); // set the prescaler so this 16 bits timer allows to wait for 60 ms ( 1/(72E6/66/(2**16))=60.07ms )
timeout_times[TIMEOUT_BEGIN] = (rcc_ahb_frequency/(TIM_PSC(TIM(SENSOR_SDM120_TIMER))+1))/baudrate/8/2.5; // wait at least 2.5 characters before sending data
timeout_times[TIMEOUT_END] = (rcc_ahb_frequency/(TIM_PSC(TIM(SENSOR_SDM120_TIMER))+1))/baudrate/8/2.5; // wait at least 2.5 characters after sending data
timeout_times[TIMEOUT_BETWEEN] = 0.06*(rcc_ahb_frequency/(TIM_PSC(TIM(SENSOR_SDM120_TIMER))+1)); // wait at least 60 ms before sending the next message
timer_clear_flag(TIM(SENSOR_SDM120_TIMER), TIM_SR_UIF); // clear flag
timer_enable_irq(TIM(SENSOR_SDM120_TIMER), TIM_DIER_UIE); // enable update interrupt for timer
nvic_enable_irq(NVIC_TIM_IRQ(SENSOR_SDM120_TIMER)); // catch interrupt in service routine
// reset states
tx_used = 0;
rx_used = 0;
sensor_sdm120_measurement_received = false;
}
static bool sensor_sdm120_transmit_request(uint8_t meter_id, uint8_t function, uint16_t address, float value)
{
if (meter_id==0) { // broadcast request are not supported
return false;
}
if (function!=0x03 && function!=0x04 && function!=0x10) { // function not supported
return false;
}
if (address%2) { // even register addresses are not supported by device
return false;
}
while (tx_used) { // transmission is ongoing
__WFI(); // wait until something happens (transmission ended)
}
// build request packet
uint8_t packet[11]; // buffer to build ModBus message (without error check)
uint8_t packet_size = 0; // ModBus message size (without error check)
packet[0] = meter_id; // set slave device address
packet[1] = function; // set function
packet[2] = address>>8; // set high register address
packet[3] = address; // set low register address
packet[4] = 0; // set high number of registers to read
packet[5] = 2; // set low number of register to read (the measurement are encoded using 32 bits IEE745 float, and register hold 16 bits, thus we want to read 2 registers
if (function==0x03 || function==0x04) { // read register
packet_size = 6; // set message size
} else if (function==0x10) { // write register
packet[6] = 4; // byte count (writing two 16 bits registers)
// store little endian encoded value in big endian encoded data
uint8_t* data = (uint8_t*)&value;
packet[7] = data[3];
packet[8] = data[2];
packet[9] = data[1];
packet[10] = data[0];
packet_size = 11; // set message size
}
uint16_t crc = crc_modbus(packet, packet_size); // compute error check
for (uint8_t i=0; i<packet_size; i++) {
tx_buffer[packet_size-i+1] = packet[i]; // copy packet to tx buffer in reverse order (this is how sending is implemented)
}
tx_buffer[1] = crc; // set low error check
tx_buffer[0] = crc>>8; // set high error check
tx_used = packet_size+2; // set request size
rx_used = 0; // reset reset buffer
sensor_sdm120_measurement_received = false; // reset measurement flag
while (TIM_CR1(TIM(SENSOR_SDM120_TIMER))&TIM_CR1_CEN) { // timer is already used
__WFI(); // wait until something happens (timer is available again)
}
gpio_set(GPIO(SENSOR_SDM120_REDE_PORT),GPIO(SENSOR_SDM120_REDE_PIN)); // enable driver output and disable receive output
// start timeout
timeout = TIMEOUT_BEGIN; // select time before sending message
timer_set_period(TIM(SENSOR_SDM120_TIMER), timeout_times[timeout]); // set corresponding timeout
timer_set_counter(TIM(SENSOR_SDM120_TIMER), 0); // reset timer counter to get preset waiting time
timer_enable_counter(TIM(SENSOR_SDM120_TIMER)); // wait
return true;
}
bool sensor_sdm120_measurement_request(uint8_t meter_id, enum sensor_sdm120_measurement_type_t type)
{
if (type>=SENSOR_SDM120_MEASUREMENT_MAX) { // invalid type
return false;
}
return sensor_sdm120_transmit_request(meter_id, 0x04, register_input[type], 0);
}
bool sensor_sdm120_configuration_request(uint8_t meter_id, enum sensor_sdm120_configuration_type_t type)
{
if (type>=SENSOR_SDM120_CONFIGURATION_MAX) { // invalid type
return false;
}
return sensor_sdm120_transmit_request(meter_id, 0x03, register_holding[type], 0);
}
bool sensor_sdm120_configuration_set(uint8_t meter_id, enum sensor_sdm120_configuration_type_t type, float value)
{
if (type>=SENSOR_SDM120_CONFIGURATION_MAX) { // invalid type
return false;
}
return sensor_sdm120_transmit_request(meter_id, 0x10, register_holding[type], value);
}
float sensor_sdm120_measurement_decode(void)
{
float measurement = NAN; // decoded measurement to return (invalid in the beginning)
if (!sensor_sdm120_measurement_received) { // no measurement received
return NAN;
} else {
sensor_sdm120_measurement_received = false; // reset flag
}
if (rx_used<5) { // not a complete response (minimum is address, function, size/error, error check low, error check high)
return NAN;
}
// a complete message has been received
if (crc_modbus(rx_buffer,rx_used)) { // checksum error, error check failed
measurement = NAN;
} else if (rx_buffer[1]&0x80) { // error condition received
measurement = INFINITY; // indicate we received and error
} else {
switch (rx_buffer[1]) {
case 0x03: // read 4xxx holding register response received
case 0x04: // read 3xxxx input register response received
if (rx_buffer[2]==0x04 && rx_used>=(4+5)) { // 2 registers received, corresponds to implemented request
// convert big endian received float value to little endian return value
uint8_t* convert = (uint8_t*)&measurement;
convert[0] = rx_buffer[6];
convert[1] = rx_buffer[5];
convert[2] = rx_buffer[4];
convert[3] = rx_buffer[3];
}
break;
case 0x10: // write 4xxx holding register response received
measurement = (rx_buffer[4]<<8)+rx_buffer[5]; // number of registers written
break; // not supported currently
default: // unknown function response received
measurement = INFINITY;
break; // nothing to do
}
}
rx_used = 0; // reset rx_buffer usage
return measurement;
}
void USART_ISR(SENSOR_SDM120_USART)(void)
{
if (usart_get_interrupt_source(USART(SENSOR_SDM120_USART), USART_SR_TXE)) { // data has been transmitted
if (tx_used) { // not all bytes transmitted
usart_send(USART(SENSOR_SDM120_USART),tx_buffer[--tx_used]); // transmit next byte (clears flag)
} else { // all bytes transmitted
usart_disable_tx_interrupt(USART(SENSOR_SDM120_USART)); // disable transmit interrupt
USART_SR(USART(SENSOR_SDM120_USART)) &= ~USART_SR_TXE; // clear flag
USART_CR1(USART(SENSOR_SDM120_USART)) |= USART_CR1_TCIE; // enable transfer complete interrupt
}
}
if (usart_get_interrupt_source(USART(SENSOR_SDM120_USART), USART_SR_TC)) { // data has been completely transmitted
USART_CR1(USART(SENSOR_SDM120_USART)) |= USART_CR1_TCIE; // disable transfer complete interrupt
USART_SR(USART(SENSOR_SDM120_USART)) &= ~USART_SR_TC; // clear flag
timeout = TIMEOUT_END; // select wait time after sending data
timer_set_period(TIM(SENSOR_SDM120_TIMER), timeout_times[timeout]); // set corresponding timeout
timer_set_counter(TIM(SENSOR_SDM120_TIMER), 0); // reset timer counter to get preset waiting time
timer_enable_counter(TIM(SENSOR_SDM120_TIMER)); // wait
}
if (usart_get_interrupt_source(USART(SENSOR_SDM120_USART), USART_SR_RXNE)) { // data has been received
if (gpio_get(GPIO(SENSOR_SDM120_REDE_PORT),GPIO(SENSOR_SDM120_REDE_PIN))) { // not in receiver mode
USART_SR(USART(SENSOR_SDM120_USART)) &= ~USART_SR_RXNE; // clear flag, ignore received data
} else if (rx_used<LENGTH(rx_buffer)) { // receiving response
rx_buffer[rx_used++] = usart_recv(USART(SENSOR_SDM120_USART)); // put received byte in buffer (clears flag)
if (rx_used==1 && rx_buffer[0]==0) { // this is wrong decoding because the signal is going low on idle, which is misinterpreted as start bit (and the 0 broadcast device address is not supported by this device)
rx_used = 0; // reset buffer
} else if (rx_used>=5 && (rx_buffer[1]&0x80)) { // error condition response received
sensor_sdm120_measurement_received = true; // notify used response has been received
} else if (rx_used>=5 && (uint8_t)(rx_used-5)>=rx_buffer[2] && (rx_buffer[1]==0x04 || rx_buffer[1]==0x03)) { // read input or holding register response received
sensor_sdm120_measurement_received = true; // notify used response has been receive
} else if (rx_used>=8 && rx_buffer[1]==0x10) { // write holding register response received
sensor_sdm120_measurement_received = true; // notify used response has been receive
}
} else { // buffer full and unknown response received
USART_SR(USART(SENSOR_SDM120_USART)) &= ~USART_SR_RXNE; // clear flag (wait for user to read measurement, this clears the buffer)
}
timeout = TIMEOUT_END; // select time after receiving data
timer_set_period(TIM(SENSOR_SDM120_TIMER), timeout_times[timeout]); // set corresponding timeout
timer_set_counter(TIM(SENSOR_SDM120_TIMER), 0); // reset timer counter to get preset waiting time
timer_enable_counter(TIM(SENSOR_SDM120_TIMER)); // wait
}
}
void TIM_ISR(SENSOR_SDM120_TIMER)(void)
{
if (timer_get_flag(TIM(SENSOR_SDM120_TIMER), TIM_SR_UIF)) { // update event happened
timer_clear_flag(TIM(SENSOR_SDM120_TIMER), TIM_SR_UIF); // clear flag
// because of the one pulse mode the timer is stopped automatically
switch (timeout) { // timeout before action passed
case (TIMEOUT_BEGIN): // we can now send the data
USART_SR(USART(SENSOR_SDM120_USART)) &= USART_SR_TXE; // clear interrupt flag
usart_enable_tx_interrupt(USART(SENSOR_SDM120_USART)); // enable interrupt to send other bytes
usart_send(USART(SENSOR_SDM120_USART),tx_buffer[--tx_used]); // start transmission
break;
case (TIMEOUT_END): // we now have to wait before sending the next message
gpio_clear(GPIO(SENSOR_SDM120_REDE_PORT),GPIO(SENSOR_SDM120_REDE_PIN)); // disable driver output (and enable receive output)
timeout = TIMEOUT_BETWEEN; // select time between sending message
timer_set_period(TIM(SENSOR_SDM120_TIMER), timeout_times[timeout]); // set corresponding timeout
timer_set_counter(TIM(SENSOR_SDM120_TIMER), 0); // reset timer counter to get preset waiting time
timer_enable_counter(TIM(SENSOR_SDM120_TIMER)); // wait
case (TIMEOUT_BETWEEN): // nothing to do, we are allowed to send the next message
break;
default:
break;
}
}
}
TIM_ISR
#define TIM_ISR(x)
get interrupt service routine for timer base on TIM identifier
Definition: global.h:113
sensor_sdm120_configuration_type_t
sensor_sdm120_configuration_type_t
configuration types for electricity meter in 4xxx holding registers
Definition: sensor_sdm120.h:45
tx_used
static volatile uint8_t tx_used
number of byte to transmit
Definition: sensor_sdm120.c:62
RCC_GPIO
#define RCC_GPIO(x)
get RCC for GPIO based on GPIO identifier
Definition: global.h:105
sensor_sdm120_measurement_decode
float sensor_sdm120_measurement_decode(void)
decode received measurement
Definition: sensor_sdm120.c:261
rx_used
static volatile uint8_t rx_used
number of received data bytes in buffer
Definition: sensor_sdm120.c:60
sensor_sdm120_setup
void sensor_sdm120_setup(uint32_t baudrate)
setup peripherals to communicate with electricity meter
Definition: sensor_sdm120.c:127
sensor_pzem_measurement_t::type
enum sensor_pzem_measurement_type_t type
measurement type
Definition: sensor_pzem.h:39
TIMEOUT_BEGIN
silent time before sending data
Definition: sensor_sdm120.c:68
sensor_sdm120.h
library to query measurements from eastron SDM120-ModBus electricity meter (API)
USART_ISR
#define USART_ISR(x)
get interrupt service routine for USART based on USART identifier
Definition: global.h:188
NVIC_TIM_IRQ
#define NVIC_TIM_IRQ(x)
get NVIC IRQ for timer base on TIM identifier
Definition: global.h:111
sensor_sdm120_measurement_received
volatile bool sensor_sdm120_measurement_received
a measurement response has been received
Definition: sensor_sdm120.c:64
sensor_sdm120_measurement_type_t
sensor_sdm120_measurement_type_t
measurement types offered by electricity meter in 3xxx input registers
Definition: sensor_sdm120.h:27
TIMEOUT_END
silent time after sending data
Definition: sensor_sdm120.c:69
global.h
global definitions and methods (API)
register_input
static const uint16_t register_input[]
SDM120 3xxxx input register start addresses for the measurement types.
Definition: sensor_sdm120.c:77
GPIO
#define GPIO(x)
get GPIO based on GPIO identifier
Definition: global.h:103
crc_modbus
static uint16_t crc_modbus(uint8_t *buffer, uint8_t size)
compute CRC for ModBus
Definition: sensor_sdm120.c:111
SENSOR_SDM120_TIMER
#define SENSOR_SDM120_TIMER
timer number to count time
Definition: sensor_sdm120.c:55
sensor_sdm120_measurement_request
bool sensor_sdm120_measurement_request(uint8_t meter_id, enum sensor_sdm120_measurement_type_t type)
request measurement from electricity meter
Definition: sensor_sdm120.c:237
RCC_TIM
#define RCC_TIM(x)
get RCC for timer based on TIM identifier
Definition: global.h:109
sensor_sdm120_configuration_request
bool sensor_sdm120_configuration_request(uint8_t meter_id, enum sensor_sdm120_configuration_type_t type)
request configuration from electricity meter
Definition: sensor_sdm120.c:245
SENSOR_SDM120_USART
#define SENSOR_SDM120_USART
USART peripheral.
Definition: sensor_sdm120.c:40
USART_IRQ
#define USART_IRQ(x)
get NVIC IRQ for USART based on USART identifier
Definition: global.h:186
TIMEOUT_BETWEEN
time to wait between messages
Definition: sensor_sdm120.c:70
USART
#define USART(x)
get USART based on USART identifier
Definition: global.h:182
USART_PORT
#define USART_PORT(x)
get port for USART based on USART identifier
Definition: global.h:190
USART_PORT_RCC
#define USART_PORT_RCC(x)
get RCC for USART port based on USART identifier
Definition: global.h:195
timeout_t
timeout_t
the ModBus timeouts to respect for sending messages
Definition: sensor_sdm120.c:67
buffer
static uint8_t * buffer
input/output buffer for read/write commands/functions
Definition: onewire_master.c:67
timeout_times
static uint16_t timeout_times[TIMEOUT_MAX]
current timeout used
Definition: sensor_sdm120.c:74
rx_buffer
static uint8_t rx_buffer[9]
buffer for received response (ModBus response messages can be 2+256+2 long but we will only read up t...
Definition: sensor_sdm120.c:59
sensor_sdm120_transmit_request
static bool sensor_sdm120_transmit_request(uint8_t meter_id, uint8_t function, uint16_t address, float value)
send request to electricity meter
Definition: sensor_sdm120.c:180
register_holding
static const uint16_t register_holding[]
SDM120 4xxxx holding register start addresses for the configuration types.
Definition: sensor_sdm120.c:94
tx_buffer
static uint8_t tx_buffer[13]
buffer for request to transmit (ModBus request messages can be 7+256+2 long but we will only write up...
Definition: sensor_sdm120.c:61
TIMEOUT_MAX
last element (useful to no the number of elements)
Definition: sensor_sdm120.c:71
SENSOR_SDM120_REDE_PORT
#define SENSOR_SDM120_REDE_PORT
GPIO port for RS-485 receiver and driver output enable signal.
Definition: sensor_sdm120.c:47
LENGTH
#define LENGTH(x)
get the length of an array
Definition: global.h:26
sensor_pzem_measurement_t::value
union sensor_pzem_measurement_t::measurement_t value
measurement value
USART_RCC
#define USART_RCC(x)
get RCC for USART based on USART identifier
Definition: global.h:184
TIM
#define TIM(x)
get TIM based on TIM identifier
Definition: global.h:107
USART_PIN_RX
#define USART_PIN_RX(x)
get receive pin for USART based on USART identifier
Definition: global.h:202
USART_PIN_TX
#define USART_PIN_TX(x)
get transmit pin for USART based on USART identifier
Definition: global.h:200
sensor_sdm120_configuration_set
bool sensor_sdm120_configuration_set(uint8_t meter_id, enum sensor_sdm120_configuration_type_t type, float value)
set configuration in electricity meter
Definition: sensor_sdm120.c:253
SENSOR_SDM120_REDE_PIN
#define SENSOR_SDM120_REDE_PIN
GPIO pin for RS-485 receiver and driver output enable signal.
Definition: sensor_sdm120.c:48
timeout
static enum timeout_t timeout
the current timeout used