{"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\/hu\/blog\/administrirovanie\/kak-podklyuchit-aczp-hx711-k-nrf52832","title":{"rendered":"Hogyan csatlakoztassuk a HX711 ADC-t az NRF52832-hez","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3>1. Bevezet\u00e9s<\/h3>\n<p>\n A feladat az nrf52832 mikrovez\u00e9rl\u0151 kommunik\u00e1ci\u00f3s protokollj\u00e1nak kidolgoz\u00e1sa volt k\u00e9t k\u00ednai fesz\u00fclts\u00e9g\u00e9rz\u00e9kel\u0151n kereszt\u00fcl. <\/p>\n<p>A feladat nem volt egyszer\u0171, mivel szembe kellett n\u00e9zni azzal, hogy nem volt egy\u00e9rtelm\u0171 inform\u00e1ci\u00f3. Val\u00f3sz\u00edn\u0171leg a 'gonosz gy\u00f6kere' mag\u00e1ban a Nordic Semiconductor SDK-j\u00e1ban rejlik - a folyamatos verzi\u00f3friss\u00edt\u00e9sek, a n\u00e9mi redundancia \u00e9s a funkci\u00f3k \u00f6sszezavarodotts\u00e1ga miatt. Mindennek null\u00e1r\u00f3l kellett nekifutnom. <\/p>\n<p><\/p>\n<p>Azt hiszem, ez a t\u00e9ma el\u00e9g aktu\u00e1lis, mivel ez a chip BLE stack-kel \u00e9s sz\u00e1mos 'finoms\u00e1ggal' rendelkezik az energiatakar\u00e9kos \u00fczemm\u00f3dban. De a technikai r\u00e9szbe nem akarok t\u00fal m\u00e9lyen belemer\u00fclni, mivel err\u0151l a t\u00e9m\u00e1r\u00f3l sok cikket \u00edrtak. <\/p>\n<p><\/p>\n<h3>2. A projekt le\u00edr\u00e1sa<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Hogyan csatlakoztassuk a HX711 ADC-t az NRF52832-hez\" src=\"\/wp-content\/uploads\/2020\/09\/f187e56e29b4f2e57ce0de3a5f2a0eab.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<p><b>Hardver:<\/b><\/p>\n<p><\/p>\n<ul>\n<li>Adafruit Feather nRF52 Bluefruit LE (ami \u00e9ppen k\u00e9zn\u00e9l volt) <\/li>\n<li>HX711 ADC <\/li>\n<li>2 db k\u00ednai fesz\u00fclts\u00e9g\u00e9rz\u00e9kel\u0151 (50x2 kg) <\/li>\n<li>ST-LINK V2 programoz\u00f3 <\/li>\n<\/ul>\n<p><\/p>\n<p><b>Szoftver:<\/b><\/p>\n<p><\/p>\n<ul>\n<li>IDE VSCODE<\/li>\n<li>NRF SDK 16<\/li>\n<li>OpenOCD<\/li>\n<li>ST-LINK V2 programoz\u00f3 <\/li>\n<\/ul>\n<p>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Minden egy projektben tal\u00e1lhat\u00f3, csak a Makefile-t kell kicsit m\u00f3dos\u00edtani (megadni a SDK el\u00e9r\u00e9si \u00fatj\u00e1t). <\/p>\n<p><\/p>\n<h3>3. A k\u00f3d le\u00edr\u00e1sa<\/h3>\n<p><\/p>\n<p>A perif\u00e9ri\u00e1val val\u00f3 munka sor\u00e1n a GPIOTE modult fogjuk haszn\u00e1lni a feladatok \u00e9s esem\u00e9nyek k\u00f6t\u00e9se alapj\u00e1n, valamint a PPI modult az adatok egy perif\u00e9ri\u00e1r\u00f3l a m\u00e1sikra val\u00f3 \u00e1tvitel\u00e9hez a processzor k\u00f6zrem\u0171k\u00f6d\u00e9se n\u00e9lk\u00fcl.<\/p>\n<pre><code class=\"cpp\">ret_code_t err_code;\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ be\u00e1ll\u00edtjuk kimenetre\n   nrf_drv_gpiote_out_config_t config = GPIOTE_CONFIG_OUT_TASK_TOGGLE(false); \/\/ az impulzushoz v\u00e1ltogatjuk a pin-t\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ be\u00e1ll\u00edtjuk kimenetre\n<\/code><\/pre>\n<p>\nA PD_SCL szinkroniz\u00e1l\u00f3 vonalat kimenetre \u00e1ll\u00edtjuk, hogy 10 \u03bcs hossz\u00fas\u00e1g\u00fa impulzusokat gener\u00e1ljon.<\/p>\n<pre><code class=\"cpp\">   nrf_drv_gpiote_in_config_t gpiote_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false); \/\/ \u00e1llapotv\u00e1lt\u00e1s magasr\u00f3l alacsonyra\n   nrf_gpio_cfg_input(DOUT, NRF_GPIO_PIN_NOPULL); \/\/ bemenetre h\u00faz\u00e1s n\u00e9lk\u00fcl\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); \/\/ letiltjuk a megszak\u00edt\u00e1st\n    nrf_drv_timer_enable(&amp;m_timer0); \/\/ bekapcsoljuk a timert\n}\n <\/code><\/pre>\n<p><\/p>\n<p>A DOUT adatvonalat \u00e1ll\u00edtjuk be az HX711 k\u00e9szenl\u00e9t \u00e1llapot\u00e1nak ellen\u0151rz\u00e9s\u00e9re, alacsony szint\u0171 jel eset\u00e9n aktiv\u00e1l\u00f3dik az esem\u00e9nykezel\u0151, amely letiltja az megszak\u00edt\u00e1st \u00e9s elind\u00edtja a timert a PD_SCL kimeneti szinkroniz\u00e1l\u00f3 impulzusok gener\u00e1l\u00e1s\u00e1hoz.<\/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)); \/\/ \u00f6sszekapcsoljuk a timert a kimenettel\n   APP_ERROR_CHECK(err_code);\n   err_code = nrf_drv_ppi_channel_enable(m_ppi_channel1); \/\/ aktiv\u00e1ljuk a csatorn\u00e1t\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>Ezut\u00e1n inicializ\u00e1ljuk a PPI modult, \u00e9s \u00f6sszekapcsoljuk a timer\u00fcnket a PD_SCL kimenettel, hogy 10 \u00b5s hossz\u00fas\u00e1g\u00fa impulzusokat gener\u00e1ljunk, amikor a hasonl\u00edt\u00e1si esem\u00e9ny bek\u00f6vetkezik, valamint enged\u00e9lyezz\u00fck a GPIOTE modult.<\/p>\n<p><\/p>\n<pre><code class=\"cpp\">\nnrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG; \/\/ alap\u00e9rtelmezett be\u00e1ll\u00edt\u00e1s\n   timer_cfg.frequency = NRF_TIMER_FREQ_1MHz; \/\/ 1 MHz frekvenci\u00e1n m\u0171k\u00f6dik\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); \/\/ \u00f6sszehasonl\u00edt\u00e1skor aktiv\u00e1l\u00f3dik<\/code><\/pre>\n<p><\/p>\n<p> Inicializ\u00e1ljuk a nulla timert \u00e9s annak kezel\u0151j\u00e9t. <\/p>\n<pre><code class=\"cpp\">  if(m_counter%2 != 0 &amp;&amp; m_counter &lt;= 48) {\n       buffer &lt;&lt;= 1; \/\/ olvasott adatok v\u00e1ltoz\u00f3ja\n        c_counter++; \/\/ pozit\u00edv impulzusok sz\u00e1ml\u00e1l\u00f3ja\n           if(nrf_gpio_pin_read(DOUT)) buffer++; \/\/ a bemenet \u00e1llapot\u00e1nak olvas\u00e1sa\n   }\n<\/code><\/pre>\n<p><\/p>\n<p> A leg\u00e9rdekesebb dolog a timer kezel\u0151ben t\u00f6rt\u00e9nik. Az impulzusok peri\u00f3dusa 20 \u00b5s. Azokat az p\u00e1ratlan impulzusokat keress\u00fck (felfel\u00e9 \u00e1tl\u00e9p\u0151 \u00e9len), \u00e9s annak a felt\u00e9telnek megfelel\u0151en, hogy ezek sz\u00e1ma nem haladja meg a 24, valamint az esem\u00e9nyek sz\u00e1ma 48. Minden p\u00e1ratlan esem\u00e9nyn\u00e9l beolvassuk a DOUT-ot. <\/p>\n<p><\/p>\n<p> A datasheetb\u0151l k\u00f6vetkezik, hogy az impulzusok sz\u00e1ma legal\u00e1bb 25 kell legyen, ami 128-as er\u0151s\u00edt\u00e9si ar\u00e1nynak felel meg (a k\u00f3dban 25 impulzust haszn\u00e1ltam), ez 50 timer esem\u00e9nynek felel meg, ami a d\u00e1tumkeret v\u00e9g\u00e9t jelzi. <\/p>\n<p><\/p>\n<pre><code class=\"cpp\"> ++m_counter; \/\/ esem\u00e9nyek sz\u00e1ml\u00e1l\u00f3ja\nif(m_counter == 50) {\n      nrf_drv_timer_disable(&amp;m_timer0); \/\/ letiltjuk a timert\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STOPPED; \/\/\n       buffer = buffer ^ 0x800000;\n       hx711_stop(); \/\/ letiltjuk a hx711-et\n       }\n   <\/code><\/pre>\n<p><\/p>\n<p> Ezut\u00e1n le\u00e1ll\u00edtjuk a timert \u00e9s feldolgozzuk az adatokat (a datasheet szerint), majd \u00e1tkapcsoljuk az HX711-et alacsony energiafogyaszt\u00e1s\u00fa m\u00f3dba. <\/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      hx711_start(); \/\/ bekapcsoljuk a hx711-et\n       nrf_drv_gpiote_out_toggle(LED_1);\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STARTED;\n   }\n}\n\/**@brief Id\u0151k l\u00e9trehoz\u00e1sa.\n*\/*\nstatic void create_timers()\n{\n   ret_code_t err_code;\n   \/\/ Id\u0151k l\u00e9trehoz\u00e1sa\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> V\u00e1rjuk az esem\u00e9nyeket az RTC id\u0151z\u00edt\u0151t\u0151l 10 m\u00e1sodperces id\u0151k\u00f6z\u00f6nk\u00e9nt (ez m\u00e1r az \u00d6n v\u00e1laszt\u00e1sa), az esem\u00e9nykezel\u0151ben elind\u00edtjuk az HX711-et, megszak\u00edt\u00e1st h\u00edvva a DOUT vonalon.<\/p>\n<p>Van m\u00e9g egy dolog, a napl\u00f3kat UART-on kereszt\u00fcl k\u00fcldj\u00fck (baud rate 115200, TX \u2014 6 pin, RX \u2014 8 pin), minden be\u00e1ll\u00edt\u00e1s a sdk_config.h f\u00e1jlban tal\u00e1lhat\u00f3.<\/p>\n<p><img decoding=\"async\" alt=\"Hogyan csatlakoztassuk a HX711 ADC-t az NRF52832-hez\" src=\"\/wp-content\/uploads\/2020\/09\/95a8f333227fe26cb8e9827b39bb6350.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3> K\u00f6vetkeztet\u00e9sek<\/h3>\n<p><\/p>\n<p>K\u00f6sz\u00f6n\u00f6m mindenkinek a figyelmet, rem\u00e9lem, hogy ez a cikk hasznos lesz, \u00e9s \u00e9rt\u00e9kes id\u0151t takar\u00edt meg a fejleszt\u0151k sz\u00e1m\u00e1ra a megold\u00e1skeres\u00e9s sor\u00e1n. Szeretn\u00e9m megeml\u00edteni, hogy a Nordic \u00e1ltal haszn\u00e1lt technikai megk\u00f6zel\u00edt\u00e9s a platformjaikon nagyon \u00e9rdekes az energiahat\u00e9konys\u00e1g szempontj\u00e1b\u00f3l.<\/p>\n<p><\/p>\n<h3>P.S. <\/h3>\n<p><\/p>\n<p>A projekt m\u00e9g fejleszt\u00e9s alatt \u00e1ll, \u00edgy ha \u00e9rdekli ez a t\u00e9ma, a k\u00f6vetkez\u0151 cikkben megpr\u00f3b\u00e1lom le\u00edrni a s\u00falym\u00e9r\u0151k kalibr\u00e1l\u00e1s\u00e1nak algoritmus\u00e1t, valamint a BLE verem csatlakoz\u00e1s\u00e1t.<\/p>\n<p><\/p>\n<h3> Anyagok <\/h3>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/CiochinaVitalie\/nrf52832-HX711\">A projekt k\u00f3dja<\/a><\/noindex> <\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/cdn.sparkfun.com\/datasheets\/Sensors\/ForceFlex\/hx711_english.pdf\">HX711 adatlap angolul<\/a><\/noindex><\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/wiki.iarduino.ru\/page\/hx_711_with_tenzo\/\">A tenzometrikus \u00e9rz\u00e9kel\u0151k m\u0171k\u00f6d\u00e9s\u00e9nek le\u00edr\u00e1sa<\/a><\/noindex><\/li>\n<\/ul>\n<p>Forr\u00e1s: <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 5.0.3 - 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