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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/>.
*
*/
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/** STM32F1 example
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* @ file main . c
* @ author King Kévin < kingkevin @ cuvoodoo . info >
* @ date 2016
*/
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/* standard libraries */
# include <stdint.h> // standard integer types
# include <stdio.h> // standard I/O facilities
# include <stdlib.h> // standard utilities
# include <unistd.h> // standard streams
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# include <string.h> // string utilities
# include <math.h> // mathematical utilities
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/* STM32 (including CM3) libraries */
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# include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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# include <libopencm3/cm3/scb.h> // vector table definition
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# include <libopencm3/cm3/nvic.h> // interrupt utilities
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# include <libopencm3/stm32/gpio.h> // general purpose input output library
# include <libopencm3/stm32/rcc.h> // real-time control clock library
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# include <libopencm3/stm32/exti.h> // external interrupt utilities
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# include <libopencm3/stm32/rtc.h> // real time clock utilities
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# include <libopencm3/stm32/iwdg.h> // independent watchdog utilities
# include <libopencm3/stm32/dbgmcu.h> // debug utilities
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/* own libraries */
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# include "global.h" // board definitions
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//#include "usart.h" // USART utilities
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# include "usb_cdcacm.h" // USB CDC ACM utilities
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# include "sensor_pzem.h" // PZEM electricity meter utilities
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# include "sensor_sdm120.h" // SDM120 electricity meter utilities
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# include "radio_esp8266.h" // ESP8266 WiFi SoC utilities
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/** @defgroup main_flags flag set in interrupts to be processed in main task
* @ {
*/
volatile bool rtc_internal_tick_flag = false ; /**< flag set when internal RTC ticked */
/** @} */
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int _write ( int file , char * ptr , int len )
{
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int i ; // how much data has been sent
static char newline = 0 ; // what newline has been sent
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if ( file = = STDOUT_FILENO | | file = = STDERR_FILENO ) {
for ( i = 0 ; i < len ; i + + ) {
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if ( ptr [ i ] = = ' \r ' | | ptr [ i ] = = ' \n ' ) { // send CR+LF newline for most carriage return and line feed combination
if ( newline = = 0 | | ( newline = = ptr [ i ] ) ) { // newline has already been detected
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//usart_putchar_nonblocking('\r'); // send newline over USART
//usart_putchar_nonblocking('\n'); // send newline over USART
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cdcacm_putchar ( ' \r ' ) ; // send newline over USB
cdcacm_putchar ( ' \n ' ) ; // send newline over USB
newline = ptr [ i ] ; // remember the newline
}
if ( ptr [ i ] = = ' \n ' ) { // line feed are always considered to end a line (the LF+CR combination is not supported to better support the others)
newline = 0 ; // clear new line
}
} else { // non-newline character
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//usart_putchar_nonblocking(ptr[i]); // send byte over USART
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cdcacm_putchar ( ptr [ i ] ) ; // send byte over USB
newline = 0 ; // clear new line
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}
}
return i ;
}
return - 1 ;
}
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/** user input command */
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static char command [ 32 ] = { 0 } ;
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/** user input command index */
uint8_t command_i = 0 ;
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/** process user command
* @ param [ in ] str user command string ( \ 0 ended )
*/
static void process_command ( char * str )
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{
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// split command
const char * delimiter = " " ;
char * word = strtok ( str , delimiter ) ;
if ( ! word ) {
goto error ;
}
// parse command
if ( 0 = = strcmp ( word , " help " ) ) {
printf ( " available commands: \n " ) ;
printf ( " led [on|off|toggle] \n " ) ;
printf ( " time [HH:MM:SS] \n " ) ;
} else if ( 0 = = strcmp ( word , " led " ) ) {
word = strtok ( NULL , delimiter ) ;
if ( ! word ) {
goto error ;
} else if ( 0 = = strcmp ( word , " on " ) ) {
led_on ( ) ; // switch LED on
printf ( " LED switched on \n " ) ; // notify user
} else if ( 0 = = strcmp ( word , " off " ) ) {
led_off ( ) ; // switch LED off
printf ( " LED switched off \n " ) ; // notify user
} else if ( 0 = = strcmp ( word , " toggle " ) ) {
led_toggle ( ) ; // toggle LED
printf ( " LED toggled \n " ) ; // notify user
} else {
goto error ;
}
} else if ( 0 = = strcmp ( word , " time " ) ) {
word = strtok ( NULL , delimiter ) ;
if ( ! word ) {
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printf ( " current time: %02lu:%02lu:%02lu \n " , rtc_get_counter_val ( ) / ( 60 * 60 ) , ( rtc_get_counter_val ( ) % ( 60 * 60 ) ) / 60 , ( rtc_get_counter_val ( ) % 60 ) ) ; // get and print time from internal RTC
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} else if ( strlen ( word ) ! = 8 | | word [ 0 ] < ' 0 ' | | word [ 0 ] > ' 2 ' | | word [ 1 ] < ' 0 ' | | word [ 1 ] > ' 9 ' | | word [ 3 ] < ' 0 ' | | word [ 3 ] > ' 5 ' | | word [ 4 ] < ' 0 ' | | word [ 4 ] > ' 9 ' | | word [ 6 ] < ' 0 ' | | word [ 6 ] > ' 5 ' | | word [ 7 ] < ' 0 ' | | word [ 7 ] > ' 9 ' ) { // time format is incorrect
goto error ;
} else {
rtc_set_counter_val ( ( ( word [ 0 ] - ' 0 ' ) * 10 + ( word [ 1 ] - ' 0 ' ) * 1 ) * ( 60 * 60 ) + ( ( word [ 3 ] - ' 0 ' ) * 10 + ( word [ 4 ] - ' 0 ' ) * 1 ) * 60 + ( ( word [ 6 ] - ' 0 ' ) * 10 + ( word [ 7 ] - ' 0 ' ) * 1 ) ) ; // set time in internal RTC counter
printf ( " time set \n " ) ;
}
} else {
goto error ;
}
return ; // command successfully processed
error :
printf ( " command not recognized. enter help to list commands \n " ) ;
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return ;
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}
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/** send HTTP data
* @ warning blocking until a response has been received
* @ param [ in ] data data to be send
* @ param [ in ] length number of bytes to be sent , set to 0 to use the string length
* @ return if data has been sent
*/
static bool http_send ( uint8_t * data , size_t length )
{
if ( length = = 0 ) {
radio_esp8266_send ( data , strlen ( ( char * ) data ) ) ; // send string data
} else {
radio_esp8266_send ( data , length ) ; // send raw data
}
while ( ! radio_esp8266_activity ) { // wait until response has been received
__WFI ( ) ; // wait until something happens
}
if ( ! radio_esp8266_success ) {
fprintf ( stderr , " could not send data \n " ) ;
return false ;
}
return true ;
}
/** end HTTP connection
* @ warning blocking until a response has been received
* @ return if connection has been closed
*/
static bool http_end ( void )
{
radio_esp8266_close ( ) ; // close connection
while ( ! radio_esp8266_activity ) { // wait until response has been received
__WFI ( ) ; // wait until something happens
}
return radio_esp8266_success ;
}
/** open HTTP connection and send POST header
* @ warning blocking until a response has been received
* @ param [ in ] host host name or IP of HTTP server to connect to
* @ param [ in ] port port number of HTTP server to connect to
* @ param [ in ] length number of bytes to POST
* @ return if HTTP POST succeeded
*/
static bool http_post_header ( char * host , uint16_t port , size_t length )
{
char http_line [ 256 ] = { 0 } ; // generated lines
radio_esp8266_tcp_open ( host , port ) ; // open connection
while ( ! radio_esp8266_activity ) { // wait until response has been received
__WFI ( ) ; // wait until something happens
}
if ( ! radio_esp8266_success ) {
fprintf ( stderr , " TCP connection failed \n " ) ;
return false ;
}
if ( ! http_send ( ( uint8_t * ) " POST /write?db=test HTTP/1.1 \r \n " , 0 ) ) { // send data
return false ;
}
if ( snprintf ( http_line , LENGTH ( http_line ) , " Content-Length: %u \r \n " , length ) < 0 ) { // set content length (for measurements)
fprintf ( stderr , " could not create line \n " ) ;
return false ;
}
if ( ! http_send ( ( uint8_t * ) http_line , 0 ) ) { // send data
return false ;
}
if ( ! http_send ( ( uint8_t * ) " Host: influx \r \n " , 0 ) ) { // send data
return false ;
}
if ( ! http_send ( ( uint8_t * ) " \r \n " , 0 ) ) { // send data
return false ;
}
return true ;
}
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/** program entry point
* this is the firmware function started by the micro - controller
*/
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void main ( void ) ;
void main ( void )
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{
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rcc_clock_setup_in_hse_8mhz_out_72mhz ( ) ; // use 8 MHz high speed external clock to generate 72 MHz internal clock
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# if DEBUG
DBGMCU_CR | = DBGMCU_CR_IWDG_STOP ; // stop independent watchdog counter when code is halted
DBGMCU_CR | = DBGMCU_CR_WWDG_STOP ; // stop window watchdog counter when code is halted
DBGMCU_CR | = DBGMCU_CR_STANDBY ; // allow debug also in standby mode (keep digital part and clock powered)
DBGMCU_CR | = DBGMCU_CR_STOP ; // allow debug also in stop mode (keep clock powered)
DBGMCU_CR | = DBGMCU_CR_SLEEP ; // allow debug also in sleep mode (keep clock powered)
# endif
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// setup board
board_setup ( ) ;
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// setup USART and USB for user communication
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//usart_setup(); // setup USART (for printing)
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cdcacm_setup ( ) ; // setup USB CDC ACM (for printing)
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setbuf ( stdout , NULL ) ; // set standard out buffer to NULL to immediately print
setbuf ( stderr , NULL ) ; // set standard error buffer to NULL to immediately print
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// minimal setup ready
printf ( " welcome to the STM32F1 CuVoodoo example code \n " ) ; // print welcome message
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// setup RTC
printf ( " setup internal RTC: " ) ;
rtc_auto_awake ( RCC_LSE , 32768 - 1 ) ; // ensure internal RTC is on, uses the 32.678 kHz LSE, and the prescale is set to our tick speed, else update backup registers accordingly (power off the micro-controller for the change to take effect)
rtc_interrupt_enable ( RTC_SEC ) ; // enable RTC interrupt on "seconds"
nvic_enable_irq ( NVIC_RTC_IRQ ) ; // allow the RTC to interrupt
printf ( " OK \n " ) ;
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uint32_t ticks_time = rtc_get_counter_val ( ) ; // get time from internal RTC (since first start/power up)
printf ( " uptime: %02lu:%02lu:%02lu \n " , ticks_time / ( 60 * 60 ) , ( ticks_time % ( 60 * 60 ) ) / 60 , ( ticks_time % 60 ) ) ; // display time
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// setup PZEM electricity meter
printf ( " setup PZEM-004 electricity meter: " ) ;
sensor_pzem_setup ( ) ; // setup PZEM electricity meter
printf ( " OK \n " ) ;
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sensor_pzem_measurement_request ( 0xc0a80101 , SENSOR_PZEM_VOLTAGE ) ;
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// setup SDM120 electricity meter
printf ( " setup SDM120 electricity meter: " ) ;
sensor_sdm120_setup ( ) ; // setup SDM120 electricity meter
printf ( " OK \n " ) ;
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sensor_sdm120_measurement_request ( 2 , SENSOR_SDM120_VOLTAGE ) ;
//sensor_sdm120_configuration_request(1,SENSOR_SDM120_METER_ID);
//sensor_sdm120_configuration_request(1,SENSOR_SDM120_BAUD_RATE);
//sensor_sdm120_configuration_set(1,SENSOR_SDM120_METER_ID,2);
//sensor_sdm120_configuration_set(2,SENSOR_SDM120_BAUD_RATE,2);
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//setup ESP8266 WiFi SoC
printf ( " setup ESP8266 WiFi SoC: " ) ;
radio_esp8266_setup ( ) ;
printf ( " OK \n " ) ;
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# if !(DEBUG)
//setup watchdog to reset in case we get stuck (i.e. when an error occurred)
# define WATCHDOG_PERIOD 10000 /**< watchdog period in ms */
printf ( " setup watchdog (%.2fs): " , WATCHDOG_PERIOD / 1000.0 ) ;
iwdg_set_period_ms ( WATCHDOG_PERIOD ) ; // set independent watchdog period
iwdg_start ( ) ; // start independent watchdog
printf ( " OK \n " ) ;
# endif
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// send HTTP POST request
printf ( " making HTTP request: " ) ;
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char line [ 256 ] = { 0 } ; // measurement line to send
if ( snprintf ( line , LENGTH ( line ) , " cpu_load_short,host=server01,region=us-west value=0.64 1434055562000000000 " ) < 0 ) {
fprintf ( stderr , " could not create line \n " ) ;
} else if ( ! http_post_header ( " 192.168.42.3 " , 8086 , strlen ( line ) ) ) { // send header
fprintf ( stderr , " could not sent HTTP POST header \n " ) ;
} else if ( ! http_send ( ( uint8_t * ) line , 0 ) ) { // send data
fprintf ( stderr , " could not send measurement \n " ) ;
} else {
http_end ( ) ; // end HTTP request (don't care about the result)
printf ( " OK \n " ) ;
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}
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// main loop
printf ( " command input: ready \n " ) ;
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bool action = false ; // if an action has been performed don't go to sleep
button_flag = false ; // reset button flag
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char c = ' ' ; // to store received character
bool char_flag = false ; // a new character has been received
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while ( true ) { // infinite loop
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iwdg_reset ( ) ; // kick the dog
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/*
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while ( usart_received ) { // data received over UART
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action = true ; // action has been performed
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led_toggle ( ) ; // toggle LED
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c = usart_getchar ( ) ; // store receive character
char_flag = true ; // notify character has been received
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}
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*/
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while ( cdcacm_received ) { // data received over USB
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action = true ; // action has been performed
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led_toggle ( ) ; // toggle LED
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c = cdcacm_getchar ( ) ; // store receive character
char_flag = true ; // notify character has been received
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}
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while ( char_flag ) { // user data received
char_flag = false ; // reset flag
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action = true ; // action has been performed
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printf ( " %c " , c ) ; // echo receive character
if ( c = = ' \r ' | | c = = ' \n ' ) { // end of command received
if ( command_i > 0 ) { // there is a command to process
command [ command_i ] = 0 ; // end string
command_i = 0 ; // prepare for next command
process_command ( command ) ; // process user command
}
} else { // user command input
command [ command_i ] = c ; // save command input
if ( command_i < LENGTH ( command ) - 2 ) { // verify if there is place to save next character
command_i + + ; // save next character
}
}
}
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while ( sensor_pzem_measurement_received ) { // measurement from electricity meter received
struct sensor_pzem_measurement_t measurement = sensor_pzem_measurement_decode ( ) ; // decode measurement
if ( measurement . valid ) { // only show valid measurement
switch ( measurement . type ) {
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case SENSOR_PZEM_VOLTAGE :
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printf ( " voltage: %.01f V \n " , measurement . value . voltage ) ;
break ;
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case SENSOR_PZEM_CURRENT :
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printf ( " current: %.02f A \n " , measurement . value . current ) ;
break ;
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case SENSOR_PZEM_POWER :
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printf ( " power: %.00f W \n " , measurement . value . power ) ;
break ;
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case SENSOR_PZEM_ENERGY :
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printf ( " energy: %lu Wh \n " , measurement . value . energy ) ;
break ;
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case SENSOR_PZEM_ADDRESS :
printf ( " address set \n " ) ;
break ;
case SENSOR_PZEM_ALARM :
printf ( " alarm threshold set \n " ) ;
break ;
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default :
break ;
}
}
}
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while ( sensor_sdm120_measurement_received ) { // measurement from electricity meter received
float measurement = sensor_sdm120_measurement_decode ( ) ; // decode measurement
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if ( isnan ( measurement ) ) {
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printf ( " error in response \n " ) ;
} else if ( isinf ( measurement ) ) {
printf ( " error message received \n " ) ;
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} else {
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printf ( " measurement: %.01f \n " , measurement ) ;
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}
}
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while ( button_flag ) { // user pressed button
action = true ; // action has been performed
printf ( " button pressed \n " ) ;
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led_toggle ( ) ; // toggle LED
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for ( uint32_t i = 0 ; i < 1000000 ; i + + ) { // wait a bit to remove noise and double trigger
__asm__ ( " nop " ) ;
}
button_flag = false ; // reset flag
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}
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while ( rtc_internal_tick_flag ) { // the internal RTC ticked
rtc_internal_tick_flag = false ; // reset flag
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led_toggle ( ) ; // toggle LED (good to indicate if main function is stuck)
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ticks_time = rtc_get_counter_val ( ) ; // copy time from internal RTC for processing
action = true ; // action has been performed
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if ( ( ticks_time % ( 60 ) ) = = 0 ) { // one minute passed
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printf ( " uptime: %02lu:%02lu:%02lu \n " , ticks_time / ( 60 * 60 ) , ( ticks_time % ( 60 * 60 ) ) / 60 , ( ticks_time % 60 ) ) ; // display external time
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}
}
if ( action ) { // go to sleep if nothing had to be done, else recheck for activity
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action = false ;
} else {
__WFI ( ) ; // go to sleep
}
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}
}
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/** @brief interrupt service routine called when tick passed on RTC */
void rtc_isr ( void )
{
rtc_clear_flag ( RTC_SEC ) ; // clear flag
rtc_internal_tick_flag = true ; // notify to show new time
}