{"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\/es\/blog\/administrirovanie\/kak-podklyuchit-aczp-hx711-k-nrf52832","title":{"rendered":"C\u00f3mo conectar el ADC HX711 al NRF52832","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h3>1. Introducci\u00f3n<\/h3>\n<p>\n El objetivo era desarrollar un protocolo de comunicaci\u00f3n entre el microcontrolador nrf52832 y dos transductores de carga de media puente de origen chino. <\/p>\n<p>La tarea result\u00f3 ser compleja, ya que me encontr\u00e9 con la falta de informaci\u00f3n clara. Es probable que \"el origen del problema\" resida en el propio SDK de Nordic Semiconductor: las constantes actualizaciones de versiones, cierta redundancia y confusi\u00f3n en la funcionalidad. Tuve que escribirlo todo desde cero. <\/p>\n<p><\/p>\n<p>Creo que este tema es bastante relevante, considerando que este chip cuenta con una pila BLE y un conjunto completo de \"mejoras\" en el modo de ahorro de energ\u00eda. Pero no profundizar\u00e9 demasiado en la parte t\u00e9cnica, ya que se han escrito bastantes art\u00edculos sobre este tema. <\/p>\n<p><\/p>\n<h3>2. Descripci\u00f3n del proyecto<\/h3>\n<p>\n<img decoding=\"async\" alt=\"C\u00f3mo conectar el ADC HX711 al 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 (lo que ten\u00eda a mano) <\/li>\n<li>ADC HX711 <\/li>\n<li>Transductores de carga chinos 2 pcs (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>Todo se encuentra en un solo proyecto, solo tendr\u00e9 que ajustar el Makefile (especificar la ubicaci\u00f3n de su SDK). <\/p>\n<p><\/p>\n<h3>3. Descripci\u00f3n del c\u00f3digo<\/h3>\n<p><\/p>\n<p>Usaremos el m\u00f3dulo GPIOTE para trabajar con la periferia, bas\u00e1ndonos en la asignaci\u00f3n de tareas y eventos, as\u00ed como el m\u00f3dulo PPI para transferir datos de una periferia a otra sin la participaci\u00f3n del procesador.<\/p>\n<pre><code class=\"cpp\">ret_code_t err_code;\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ configuramos como salida\n   nrf_drv_gpiote_out_config_t config = GPIOTE_CONFIG_OUT_TASK_TOGGLE(false); \/\/ alternaremos el pin para el pulso\n   err_code = nrf_drv_gpiote_out_init(PD_SCK, &amp;config); \/\/ configuramos como salida\n<\/code><\/pre>\n<p>\nConfiguramos la l\u00ednea de sincronizaci\u00f3n PD_SCL como salida para generar pulsos de 10 \u00b5s de duraci\u00f3n.<\/p>\n<pre><code class=\"cpp\">   nrf_drv_gpiote_in_config_t gpiote_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false); \/\/ transici\u00f3n de alto a bajo nivel\n   nrf_gpio_cfg_input(DOUT, NRF_GPIO_PIN_NOPULL); \/\/ entrada sin 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); \/\/ desactivamos la interrupci\u00f3n\n    nrf_drv_timer_enable(&amp;m_timer0); \/\/ activamos el temporizador\n}\n <\/code><\/pre>\n<p><\/p>\n<p>Configuramos la l\u00ednea de datos DOUT para leer el estado de preparaci\u00f3n del HX711, al detectar un nivel bajo, se activa un controlador en el que desactivamos la interrupci\u00f3n y comenzamos el temporizador para generar pulsos sincronizados en la salida 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 el temporizador a la salida\n   APP_ERROR_CHECK(err_code);\n   err_code = nrf_drv_ppi_channel_enable(m_ppi_channel1); \/\/ activamos el 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>Luego inicializamos el m\u00f3dulo PPI y conectamos nuestro temporizador a la salida PD_SCL, para generar pulsos de 10 \u00b5s al ocurrir el evento de comparaci\u00f3n, y tambi\u00e9n habilitamos el 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 defecto\n   timer_cfg.frequency = NRF_TIMER_FREQ_1MHz; \/\/ temporizamos a una frecuencia 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); \/\/ se dispara por comparaci\u00f3n<\/code><\/pre>\n<p><\/p>\n<p> Inicializamos el temporizador cero y su manejador. <\/p>\n<pre><code class=\"cpp\">  if(m_counter%2 != 0 &amp;&amp; m_counter &lt;= 48){\n       buffer &lt;&lt;= 1; \/\/ variable de datos le\u00eddos\n        c_counter++; \/\/ contador de pulsos positivos\n           if(nrf_gpio_pin_read(DOUT)) buffer++; \/\/ leemos el estado de la entrada\n   }\n<\/code><\/pre>\n<p><\/p>\n<p> Lo m\u00e1s interesante sucede en el manejador del temporizador. El per\u00edodo de los pulsos es de 20 \u00b5s. Nos interesan los pulsos impares (en el flanco ascendente) y bajo la condici\u00f3n de que su n\u00famero no exceda 24 y los eventos sean 48. En cada evento impar se realiza la lectura de DOUT. <\/p>\n<p><\/p>\n<p> Seg\u00fan la hoja de datos, el n\u00famero de pulsos debe ser al menos 25, lo que corresponde a un factor de ganancia de 128 (en el c\u00f3digo utilic\u00e9 25 pulsos), esto equivale a 50 eventos del temporizador, lo que indica el final del marco de datos. <\/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); \/\/ desactivamos el temporizador\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STOPPED; \/\/\n       buffer = buffer ^ 0x800000;\n       hx711_stop(); \/\/ desconectamos hx711\n       }\n   <\/code><\/pre>\n<p><\/p>\n<p> Despu\u00e9s de esto, deshabilitamos el temporizador y procesamos los datos (seg\u00fan la hoja de datos) y ponemos el HX711 en modo de bajo consumo. <\/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(); \/\/ activamos hx711\n       nrf_drv_gpiote_out_toggle(LED_1);\n       m_simple_timer_state = SIMPLE_TIMER_STATE_STARTED;\n   }\n}\n\/** @brief Crear temporizadores.\n*\/\nstatic void create_timers()\n{\n   ret_code_t err_code;\n\n   \/\/ Crear temporizadores\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> Esperamos un evento del temporizador RTC con un intervalo de 10 s (esto ya depende de usted) en el manejador iniciamos el HX711, llamando a la interrupci\u00f3n en la l\u00ednea DOUT.<\/p>\n<p>Hay otro punto, los registros se emiten a trav\u00e9s de UART (baud rate 115200, TX \u2014 pin 6, RX \u2014 pin 8) todas las configuraciones est\u00e1n en sdk_config.h.<\/p>\n<p><img decoding=\"async\" alt=\"C\u00f3mo conectar el ADC HX711 al NRF52832\" src=\"\/wp-content\/uploads\/2020\/09\/95a8f333227fe26cb8e9827b39bb6350.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3> Conclusiones<\/h3>\n<p><\/p>\n<p>Gracias a todos por su atenci\u00f3n, espero que este art\u00edculo sea \u00fatil y ahorre tiempo valioso en la b\u00fasqueda de soluciones para los desarrolladores. Quiero decir que el enfoque t\u00e9cnico que utiliza Nordic en sus plataformas es bastante interesante desde el punto de vista de la eficiencia energ\u00e9tica.<\/p>\n<p><\/p>\n<h3>P.D. <\/h3>\n<p><\/p>\n<p>El proyecto a\u00fan est\u00e1 en desarrollo, por lo que si este tema es de inter\u00e9s, en el pr\u00f3ximo art\u00edculo tratar\u00e9 de describir el algoritmo de calibraci\u00f3n de sensores de peso, as\u00ed como la conexi\u00f3n de la pila BLE.<\/p>\n<p><\/p>\n<h3> Materiales <\/h3>\n<p><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/CiochinaVitalie\/nrf52832-HX711\">C\u00f3digo del proyecto<\/a><\/noindex> <\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/cdn.sparkfun.com\/datasheets\/Sensors\/ForceFlex\/hx711_english.pdf\">Hoja de datos del HX711 en ingl\u00e9s<\/a><\/noindex><\/li>\n<li> <noindex><a rel=\"nofollow\" href=\"https:\/\/wiki.iarduino.ru\/page\/hx_711_with_tenzo\/\">Descripci\u00f3n del funcionamiento de los sensores de tensi\u00f3n<\/a><\/noindex><\/li>\n<\/ul>\n<p>Fuente: <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 5.0.2 - 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