{"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\/pt\/blog\/administrirovanie\/kak-podklyuchit-aczp-hx711-k-nrf52832","title":{"rendered":"Como conectar o ADC HX711 ao NRF52832","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3>1. Introdu\u00e7\u00e3o<\/h3>\n<p>\n O objetivo era desenvolver um protocolo de comunica\u00e7\u00e3o entre o microcontrolador nrf52832 e dois sensores de press\u00e3o semi-pontes chineses. <\/p>\n<p>A tarefa n\u00e3o foi simples, pois me deparei com a aus\u00eancia de informa\u00e7\u00f5es claras. \u00c9 prov\u00e1vel que a \"raiz do problema\" esteja no pr\u00f3prio SDK da Nordic Semiconductor \u2014 as constantes atualiza\u00e7\u00f5es de vers\u00f5es, certa redund\u00e2ncia e confus\u00e3o na funcionalidade. Tive que escrever tudo do zero. <\/p>\n<p><\/p>\n<p>Acredito que este tema seja bastante relevante, considerando que este chip possui uma pilha BLE e um conjunto inteiro de \"vantagens\" em modo de economia de energia. Mas n\u00e3o vou me aprofundar muito na parte t\u00e9cnica, pois j\u00e1 foram escritas v\u00e1rias mat\u00e9rias sobre isso. <\/p>\n<p><\/p>\n<h3>2. Descri\u00e7\u00e3o do projeto<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Como conectar o ADC HX711 ao 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 (o que estava \u00e0 m\u00e3o) <\/li>\n<li>ADC HX711 <\/li>\n<li>Sensores de press\u00e3o chineses 2 un. (50x2 kg) <\/li>\n<li>Programador 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>Programador ST-LINK V2 <\/li>\n<\/ul>\n<p>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Tudo est\u00e1 em um \u00fanico projeto, s\u00f3 ser\u00e1 necess\u00e1rio ajustar o Makefile (especificar a localiza\u00e7\u00e3o do seu SDK). <\/p>\n<p><\/p>\n<h3>3. Descri\u00e7\u00e3o do c\u00f3digo<\/h3>\n<p><\/p>\n<p>Usaremos o m\u00f3dulo GPIOTE para trabalhar com a periferia, com base na vincula\u00e7\u00e3o de tarefas e eventos, assim como o m\u00f3dulo PPI para transferir dados de uma periferia para outra sem a participa\u00e7\u00e3o do processador.<\/p>\n<pre><code class=\"cpp\">ret_code_t err_code;\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ configuramos para sa\u00edda\n   nrf_drv_gpiote_out_config_t config = GPIOTE_CONFIG_OUT_TASK_TOGGLE(false); \/\/ alternaremos o pino para um pulso\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ configuramos para sa\u00edda\n<\/code><\/pre>\n<p>\nConfiguramos a linha de sincroniza\u00e7\u00e3o PD_SCL como sa\u00edda para gerar pulsos com dura\u00e7\u00e3o de 10 microssegundos.<\/p>\n<pre><code class=\"cpp\">   nrf_drv_gpiote_in_config_t gpiote_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false); \/\/ transi\u00e7\u00e3o de n\u00edvel de alto para baixo\n   nrf_gpio_cfg_input(DOUT, NRF_GPIO_PIN_NOPULL); \/\/ entrada sem 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); \/\/ desabilitamos a interrup\u00e7\u00e3o\n    nrf_drv_timer_enable(&amp;m_timer0); \/\/ habilitamos o timer\n}\n <\/code><\/pre>\n<p><\/p>\n<p>Configuramos a linha de dados DOUT para ler o estado de disponibilidade do HX711; quando um n\u00edvel baixo \u00e9 detectado, o manipulador desativa a interrup\u00e7\u00e3o e ativa o timer para gerar pulsos de sincroniza\u00e7\u00e3o na sa\u00edda 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)); \/\/ conectamos o timer \u00e0 sa\u00edda\n   APP_ERROR_CHECK(err_code);\n   err_code = nrf_drv_ppi_channel_enable(m_ppi_channel1); \/\/ habilitamos o canal\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>Em seguida, inicializamos o m\u00f3dulo PPI e conectamos nosso timer \u00e0 sa\u00edda PD_SCL, para gerar pulsos de 10 \u00b5s quando ocorrer o evento de compara\u00e7\u00e3o, al\u00e9m de ativar o m\u00f3dulo GPIOTE.<\/p>\n<p><\/p>\n<pre><code class=\"cpp\">\nnrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG; \/\/ por padr\u00e3o\n   timer_cfg.frequency = NRF_TIMER_FREQ_1MHz; \/\/ temporizamos na frequ\u00eancia de 1MHz\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); \/\/ aciona por compara\u00e7\u00e3o<\/code><\/pre>\n<p><\/p>\n<p> Inicializamos o timer zero e seu manipulador. <\/p>\n<pre><code class=\"cpp\">  if(m_counter%2 != 0 &amp;&amp; m_counter &lt;= 48){\n       buffer &lt;&lt;= 1; \/\/ vari\u00e1vel de dados lidos\n        c_counter++; \/\/ contador de pulsos positivos\n           if(nrf_gpio_pin_read(DOUT)) buffer++; \/\/ lemos o estado da entrada\n   }\n<\/code><\/pre>\n<p><\/p>\n<p> O mais interessante acontece no manipulador do timer. O per\u00edodo dos pulsos \u00e9 de 20 \u00b5s. Estamos interessados em pulsos \u00edmpares (na borda ascendente) e sob a condi\u00e7\u00e3o de que sua quantidade n\u00e3o exceda 24, e eventos \u2014 48. A cada evento \u00edmpar, ocorre a leitura de DOUT. <\/p>\n<p><\/p>\n<p> Do datasheet, \u00e9 indicado que o n\u00famero de pulsos deve ser de pelo menos 25, o que corresponde a um ganho de 128 (no c\u00f3digo, utilizei 25 pulsos), isso equivale a 50 eventos do timer, indicando o fim do quadro de dados. <\/p>\n<p><\/p>\n<pre><code class=\"cpp\"> ++m_counter; \/\/ contador de eventos\nif(m_counter == 50){\n      nrf_drv_timer_disable(&amp;m_timer0); \/\/ desabilitamos o timer\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STOPPED; \/\/\n       buffer = buffer ^ 0x800000;\n       hx711_stop(); \/\/ desligamos hx711\n       }\n   <\/code><\/pre>\n<p><\/p>\n<p> Ap\u00f3s isso, desligamos o timer e processamos os dados (conforme o datasheet) e colocamos o HX711 em modo de baixo consumo de energia. <\/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(); \/\/ ligamos hx711\n       nrf_drv_gpiote_out_toggle(LED_1);\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STARTED;\n   }\n}\n\/**@brief Criar timers.\n* \/\nstatic void create_timers()\n{\n   ret_code_t err_code;\n \n   \/\/ Criar 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> Aguardando evento do temporizador RTC com intervalo de 10s (isso j\u00e1 fica a seu crit\u00e9rio) no manipulador, ativamos o HX711, chamando a interrup\u00e7\u00e3o na linha DOUT.<\/p>\n<p>H\u00e1 mais um ponto, os logs s\u00e3o gerados via UART (taxa de transmiss\u00e3o 115200, TX \u2014 pino 6, RX \u2014 pino 8) todas as configura\u00e7\u00f5es est\u00e3o em sdk_config.h<\/p>\n<p><img decoding=\"async\" alt=\"Como conectar o ADC HX711 ao NRF52832\" src=\"\/wp-content\/uploads\/2020\/09\/95a8f333227fe26cb8e9827b39bb6350.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3> Como resultado, obtemos um servi\u00e7o de \"monitoramento como servi\u00e7o\", automatizado na linha de produ\u00e7\u00e3o de integra\u00e7\u00e3o cont\u00ednua. O desenvolvedor ou testador precisa apenas definir a lista de m\u00e9tricas em um arquivo JSON, e tudo o mais acontece automaticamente. Obtemos um controle de qualidade transparente dos lan\u00e7amentos: todas as notifica\u00e7\u00f5es sobre desempenho, consumo de recursos ou regress\u00f5es arquitet\u00f4nicas.<\/h3>\n<p><\/p>\n<p>Agrade\u00e7o a todos pela aten\u00e7\u00e3o, espero que este artigo seja \u00fatil e economize o precioso tempo dos desenvolvedores na busca por solu\u00e7\u00f5es. Gostaria de dizer que a abordagem t\u00e9cnica utilizada pela Nordic em suas plataformas \u00e9 bastante interessante do ponto de vista da efici\u00eancia energ\u00e9tica.<\/p>\n<p><\/p>\n<h3>P.S. <\/h3>\n<p><\/p>\n<p>O projeto ainda est\u00e1 em desenvolvimento, portanto, se este tema for de interesse, no pr\u00f3ximo artigo tentarei descrever o algoritmo de calibra\u00e7\u00e3o dos sensores de peso, bem como a conex\u00e3o da pilha BLE.<\/p>\n<p><\/p>\n<h3> Materiais <\/h3>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/CiochinaVitalie\/nrf52832-HX711\">O c\u00f3digo do projeto<\/a><\/noindex> <\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/cdn.sparkfun.com\/datasheets\/Sensors\/ForceFlex\/hx711_english.pdf\">Datasheet do HX711 em ingl\u00eas<\/a><\/noindex><\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/wiki.iarduino.ru\/page\/hx_711_with_tenzo\/\">Descri\u00e7\u00e3o do funcionamento dos transdutores<\/a><\/noindex><\/li>\n<\/ul>\n<p>Fonte: <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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