{"id":95529,"date":"2020-09-30T19:42:39","date_gmt":"2020-09-30T17:42:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/kak-podklyuchit-aczp-hx711-k-nrf52832"},"modified":"2020-09-30T19:42:39","modified_gmt":"2020-09-30T17:42:39","slug":"kak-podklyuchit-aczp-hx711-k-nrf52832","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/administrirovanie\/kak-podklyuchit-aczp-hx711-k-nrf52832","title":{"rendered":"How to connect the HX711 ADC to the NRF52832","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3>1. Inleiding<\/h3>\n<p>\n Op de agenda stond de taak om een communicatieprotocol te ontwikkelen voor de microcontroller nrf52832 met twee halfbruggen Chinese tenso-sensoren. <\/p>\n<p>De taak bleek niet eenvoudig te zijn, aangezien ik te maken kreeg met het ontbreken van enige duidelijke informatie. Het lijkt erop dat de 'wortel van het kwaad' zich in de SDK van Nordic Semiconductor bevindt \u2014 de constante versies updates, enige overbodigheid en verwarring over de functionaliteit. Ik moest alles vanaf nul schrijven. <\/p>\n<p><\/p>\n<p>Ik denk dat dit onderwerp vrij relevant is, gezien het feit dat deze chip over een BLE-stack beschikt en een hele reeks 'snufjes' voor energiebesparingsmodus heeft. Maar ik ga niet diep op de technische details in, aangezien er al veel artikelen over dit onderwerp zijn geschreven. <\/p>\n<p><\/p>\n<h3>2. Projectbeschrijving<\/h3>\n<p>\n<img decoding=\"async\" alt=\"How to connect the HX711 ADC to the NRF52832\" src=\"\/wp-content\/uploads\/2020\/09\/f187e56e29b4f2e57ce0de3a5f2a0eab.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p><b>Hardware:<\/b><\/p>\n<p><\/p>\n<ul>\n<li>Adafruit Feather nRF52 Bluefruit LE (hetgeen dat voorhanden was) <\/li>\n<li>ADC HX711 <\/li>\n<li>Chinese tenso-sensoren 2 st. (50x2 kg) <\/li>\n<li>Programmer ST-LINK V2 <\/li>\n<\/ul>\n<p><\/p>\n<p><b>Software:<\/b><\/p>\n<p><\/p>\n<ul>\n<li>IDE VSCODE<\/li>\n<li>NRF SDK 16<\/li>\n<li>OpenOCD<\/li>\n<li>Programmer ST-LINK V2 <\/li>\n<\/ul>\n<p>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Alles is in \u00e9\u00e9n project, ik zal alleen de Makefile moeten aanpassen (de locatie van uw SDK opgeven). <\/p>\n<p><\/p>\n<h3>3. Codebeschrijving<\/h3>\n<p><\/p>\n<p>We zullen de GPIOTE-module gebruiken om met de randapparatuur te werken, op basis van de binding van taken en gebeurtenissen, evenals de PPI-module om gegevens van de ene randapparatuur naar de andere te verzenden zonder tussenkomst van de processor.<\/p>\n<pre><code class=\"cpp\">ret_code_t err_code;\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ stellen in als uitgang\n   nrf_drv_gpiote_out_config_t config = GPIOTE_CONFIG_OUT_TASK_TOGGLE(false); \/\/ we zullen de pin omzetten voor een impuls\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ stellen in als uitgang\n<\/code><\/pre>\n<p>\nWe stellen de synchronisatielijn PD_SCL in als uitgang voor het genereren van impulsen van 10 \u03bcs.<\/p>\n<pre><code class=\"cpp\">   nrf_drv_gpiote_in_config_t gpiote_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false); \/\/ niveauovergang van hoog naar laag\n   nrf_gpio_cfg_input(DOUT, NRF_GPIO_PIN_NOPULL); \/\/ als ingang zonder pull-up\n   err_code = nrf_drv_gpiote_in_init(DOUT, &amp;gpiote_config, gpiote_evt_handler); <\/code><\/pre>\n<p><\/p>\n<pre><code class=\"cpp\">static void gpiote_evt_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)\n{\n    nrf_drv_gpiote_in_event_disable(DOUT); \/\/ interrupt uitschakelen\n    nrf_drv_timer_enable(&amp;m_timer0); \/\/ timer inschakelen\n}\n <\/code><\/pre>\n<p><\/p>\n<p>We stellen de gegevenslijn DOUT in voor het uitlezen van de status van de gereedheid van de HX711; bij een laag niveau wordt de handler geactiveerd, waarin we de interrupt uitschakelen en de timer starten voor het genereren van synchroniserende impulsen op de uitgang PD_SCL.<\/p>\n<p><\/p>\n<pre><code class=\"cpp\"> err_code = nrf_drv_ppi_channel_alloc(&amp;m_ppi_channel1);\n   APP_ERROR_CHECK(err_code);\n   err_code = nrf_drv_ppi_channel_assign(m_ppi_channel1,                                         nrf_drv_timer_event_address_get(&amp;m_timer0, NRF_TIMER_EVENT_COMPARE0),                                           nrf_drv_gpiote_out_task_addr_get(PD_SCK)); \/\/ timer verbinden met uitgang\n   APP_ERROR_CHECK(err_code);\n   err_code = nrf_drv_ppi_channel_enable(m_ppi_channel1); \/\/ kanaal inschakelen\n   APP_ERROR_CHECK(err_code);\n   nrf_drv_gpiote_out_task_enable(PD_SCK); <\/code><\/pre>\n<p>\/\/ \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u043c gpiote<\/p>\n<p>Daarna initialiseren we de PPI-module en verbinden we onze timer met de uitgang PD_SCL om impulsen van 10 \u03bcs te genereren bij een vergelijkingsgebeurtenis, en schakelen we ook de GPIOTE-module in.<\/p>\n<p><\/p>\n<pre><code class=\"cpp\">\nnrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG; \/\/ standaard\n   timer_cfg.frequency = NRF_TIMER_FREQ_1MHz; \/\/ synchroniseren op 1 MHz\n   ret_code_t err_code = nrf_drv_timer_init(&amp;m_timer0, &amp;timer_cfg, timer0_event_handler);\n   APP_ERROR_CHECK(err_code);\n   nrf_drv_timer_extended_compare(&amp;m_timer0,\n                                  NRF_TIMER_CC_CHANNEL0,\n                                  nrf_drv_timer_us_to_ticks(&amp;m_timer0,\n                                                            10),\n                                  NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,\n                                  true); \/\/ gaat af bij vergelijking<\/code><\/pre>\n<p><\/p>\n<p> We initialiseren de nul-timer en zijn handler. <\/p>\n<pre><code class=\"cpp\">  if(m_counter%2 != 0 &amp;&amp; m_counter&lt;=48){\n       buffer &lt;&lt;= 1; \/\/ variabele van gelezen gegevens\n        c_counter++; \/\/ teller voor positieve impulsen\n           if(nrf_gpio_pin_read(DOUT)) buffer++; \/\/ lees de status van de ingang\n   }\n<\/code><\/pre>\n<p><\/p>\n<p> Het interessantste gebeurt in de timer-handler. De periode van de impulsen bedraagt 20 \u03bcs. We zijn ge\u00efnteresseerd in oneven impulsen (bij de opgaande flanken) onder de voorwaarde dat hun aantal niet meer dan 24 is, en dat van de gebeurtenissen - 48. Bij elke oneven gebeurtenis wordt DOUT weergegeven. <\/p>\n<p><\/p>\n<p> Uit de datasheet blijkt dat het aantal impulsen minimaal 25 moet zijn, wat overeenkomt met een versterkingsfactor van 128 (in de code heb ik 25 impulsen gebruikt), dit is equivalent aan 50 timergebeurtenissen, wat aangeeft dat het gegevensframe is afgelopen. <\/p>\n<p><\/p>\n<pre><code class=\"cpp\"> ++m_counter; \/\/ teller voor gebeurtenissen\nif(m_counter==50){\n      nrf_drv_timer_disable(&amp;m_timer0); \/\/ timer uitschakelen\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STOPPED; \/\/\n       buffer = buffer ^ 0x800000;\n       hx711_stop(); \/\/ voltooi hx711\n       }\n   <\/code><\/pre>\n<p><\/p>\n<p> Daarna schakelen we de timer uit en verwerken we de gegevens (volgens de datasheet) en zetten we de HX711 in de laag-energiebesparingsmodus. <\/p>\n<p><\/p>\n<pre><code class=\"cpp\">\nstatic void repeated_timer_handler(void * p_context)\n{\n   nrf_drv_gpiote_out_toggle(LED_2);\n   if(m_simple_timer_state == SIMPLE_TIMER_STATE_STOPPED){\n      \thx711_start(); \/\/ inschakelen hx711\n       nrf_drv_gpiote_out_toggle(LED_1);\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STARTED;\n   }\n  \n}\n\/** @brief Maak timers.\n* *\/\nstatic void create_timers()\n{\n   ret_code_t err_code;\n \n   \/\/ Maak timers\n   err_code = app_timer_create(&amp;m_repeated_timer_id,\n                               APP_TIMER_MODE_REPEATED,\n                               repeated_timer_handler);\n   APP_ERROR_CHECK(err_code);\n}\n<\/code><\/pre>\n<p><\/p>\n<p> We wachten op een gebeurtenis van de RTC-timer met een interval van 10 s (dit is aan uw eigen discretion). In de handler starten we de HX711 door een onderbreking op de DOUT-lijn te activeren.<\/p>\n<p>Er is nog een ander punt, de logs worden weergegeven via UART (baudrate 115200, TX - pin 6, RX - pin 8) alle instellingen bevinden zich in sdk_config.h.<\/p>\n<p><img decoding=\"async\" alt=\"How to connect the HX711 ADC to the NRF52832\" src=\"\/wp-content\/uploads\/2020\/09\/95a8f333227fe26cb8e9827b39bb6350.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3> Conclusies<\/h3>\n<p><\/p>\n<p>Bedankt iedereen voor uw aandacht, ik hoop dat dit artikel nuttig zal zijn en waardevolle tijd zal besparen voor ontwikkelaars die naar een oplossing zoeken. Ik wil zeggen dat de technische aanpak die Nordic gebruikt in zijn platforms interessant is vanuit het oogpunt van energie-effici\u00ebntie.<\/p>\n<p><\/p>\n<h3>P.S. <\/h3>\n<p><\/p>\n<p>Het project is nog in ontwikkeling, dus als dit onderwerp u interesseert, zal ik in het volgende artikel proberen het algoritme voor het kalibreren van gewichtssensoren en het aansluiten van de BLE-stack te beschrijven.<\/p>\n<p><\/p>\n<h3> Materialen <\/h3>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/CiochinaVitalie\/nrf52832-HX711\">De code van het project<\/a><\/noindex> <\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/cdn.sparkfun.com\/datasheets\/Sensors\/ForceFlex\/hx711_english.pdf\">Datasheet van HX711 in het Engels.<\/a><\/noindex><\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/wiki.iarduino.ru\/page\/hx_711_with_tenzo\/\">Beschrijving van de werking van strain gauges.<\/a><\/noindex><\/li>\n<\/ul>\n<p>Bron: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/521244\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>1. \u0412\u0432\u0435\u0434\u0435\u043d\u0438\u0435 \u041d\u0430 \u043f\u043e\u0432\u0435\u0441\u0442\u043a\u0435 \u0434\u043d\u044f \u0441\u0442\u043e\u044f\u043b\u0430 \u0437\u0430\u0434\u0430\u0447\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b \u043e\u0431\u0449\u0435\u043d\u0438\u044f \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u043d\u0442\u0440\u043e\u043b\u0435\u0440\u0430 nrf52832 \u0441 \u0434\u0432\u0443\u043c\u044f \u043f\u043e\u043b\u0443\u043c\u043e\u0441\u0442\u043e\u0432\u044b\u043c\u0438 \u043a\u0438\u0442\u0430\u0439\u0441\u043a\u0438\u043c\u0438 \u0442\u0435\u043d\u0437\u043e\u0434\u0430\u0442\u0447\u0438\u043a\u0430\u043c\u0438. \u0417\u0430\u0434\u0430\u0447\u0430 \u043e\u043a\u0430\u0437\u0430\u043b\u0430\u0441\u044c \u043d\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u0439, \u0442\u0430\u043a \u043a\u0430\u043a \u0441\u0442\u043e\u043b\u043a\u043d\u0443\u043b\u0441\u044f \u0441 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u0435\u043c \u043a\u0430\u043a\u043e\u0439 \u2014 \u043b\u0438\u0431\u043e \u0432\u043d\u044f\u0442\u043d\u043e\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u0412\u0435\u0440\u043e\u044f\u0442\u043d\u0435\u0435, \u0447\u0442\u043e \u00ab\u043a\u043e\u0440\u0435\u043d\u044c \u0437\u043b\u0430\u00bb \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u0441\u0430\u043c\u043e\u043c SDK \u043e\u0442 Nordic Semiconductor \u2014 \u044d\u0442\u043e \u043f\u043e\u0441\u0442\u043e\u044f\u043d\u043d\u043e\u0435 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0432\u0435\u0440\u0441\u0438\u0439, \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0438\u0437\u0431\u044b\u0442\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u0438 \u0437\u0430\u043f\u0443\u0442\u0430\u043d\u043d\u043e\u0441\u0442\u044c \u0444\u0443\u043d\u043a\u0446\u0438\u043e\u043d\u0430\u043b\u0430. \u041f\u0440\u0438\u0448\u043b\u043e\u0441\u044c \u043f\u0438\u0441\u0430\u0442\u044c \u0432\u0441\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":95530,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-95529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - 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