/** * Simple example with one sensor connected to I2C or SPI. It demonstrates the * different approaches to fetch the data. Either one of the interrupt signals * is used or new data are fetched periodically. * * Harware configuration: * * I2C * * +-----------------+ +----------+ * | ESP8266 / ESP32 | | LIS3DH | * | | | | * | GPIO 14 (SCL) ----> SCL | * | GPIO 13 (SDA) <---> SDA | * | GPIO 5 <---- INT1 | * +-----------------+ +----------+ * * SPI * * +-----------------+ +----------+ +-----------------+ +----------+ * | ESP8266 | | LIS3DH | | ESP32 | | LIS3DH | * | | | | | | | | * | GPIO 14 (SCK) ----> SCK | | GPIO 16 (SCK) ----> SCK | * | GPIO 13 (MOSI)----> SDI | | GPIO 17 (MOSI)----> SDI | * | GPIO 12 (MISO)<---- SDO | | GPIO 18 (MISO)<---- SDO | * | GPIO 2 (CS) ----> CS | | GPIO 19 (CS) ----> CS | * | GPIO 5 <---- INT1 | | GPIO 5 <---- INT1 | * +-----------------+ +---------+ +-----------------+ +----------+ */ /* -- use following constants to define the example mode ----------- */ // #define SPI_USED // SPI interface is used, otherwise I2C // #define FIFO_MODE // multiple sample read mode // #define INT_DATA // data interrupts used (data ready and FIFO status) // #define INT_EVENT // inertial event interrupts used (wake-up, free fall or 6D/4D orientation) // #define INT_CLICK // click detection interrupts used #if defined(INT_DATA) || defined(INT_EVENT) || defined(INT_CLICK) #define INT_USED #endif /* -- includes ----------------------------------------------------- */ #include "lis3dh.h" /** -- platform dependent definitions ------------------------------ */ #ifdef ESP_PLATFORM // ESP32 (ESP-IDF) // user task stack depth for ESP32 #define TASK_STACK_DEPTH 2048 // SPI interface definitions for ESP32 #define SPI_BUS HSPI_HOST #define SPI_SCK_GPIO 16 #define SPI_MOSI_GPIO 17 #define SPI_MISO_GPIO 18 #define SPI_CS_GPIO 19 #else // ESP8266 (esp-open-rtos) // user task stack depth for ESP8266 #define TASK_STACK_DEPTH 256 // SPI interface definitions for ESP8266 #define SPI_BUS 1 #define SPI_SCK_GPIO 14 #define SPI_MOSI_GPIO 13 #define SPI_MISO_GPIO 12 #define SPI_CS_GPIO 2 // GPIO 15, the default CS of SPI bus 1, can't be used #endif // ESP_PLATFORM // I2C interface defintions for ESP32 and ESP8266 #define I2C_BUS 0 #define I2C_SCL_PIN 14 #define I2C_SDA_PIN 13 #define I2C_FREQ I2C_FREQ_100K // interrupt GPIOs defintions for ESP8266 and ESP32 #define INT1_PIN 5 #define INT2_PIN 4 /* -- user tasks --------------------------------------------------- */ static lis3dh_sensor_t* sensor; /** * Common function used to get sensor data. */ void read_data () { #ifdef FIFO_MODE lis3dh_float_data_fifo_t fifo; if (lis3dh_new_data (sensor)) { uint8_t num = lis3dh_get_float_data_fifo (sensor, fifo); printf("%.3f LIS3DH num=%d\n", (double)sdk_system_get_time()*1e-3, num); for (int i=0; i < num; i++) // max. full scale is +-16 g and best resolution is 1 mg, i.e. 5 digits printf("%.3f LIS3DH (xyz)[g] ax=%+7.3f ay=%+7.3f az=%+7.3f\n", (double)sdk_system_get_time()*1e-3, fifo[i].ax, fifo[i].ay, fifo[i].az); } #else lis3dh_float_data_t data; if (lis3dh_new_data (sensor) && lis3dh_get_float_data (sensor, &data)) // max. full scale is +-16 g and best resolution is 1 mg, i.e. 5 digits printf("%.3f LIS3DH (xyz)[g] ax=%+7.3f ay=%+7.3f az=%+7.3f\n", (double)sdk_system_get_time()*1e-3, data.ax, data.ay, data.az); #endif // FIFO_MODE } #ifdef INT_USED /** * In this case, any of the possible interrupts on interrupt signal *INT1* is * used to fetch the data. * * When interrupts are used, the user has to define interrupt handlers that * either fetches the data directly or triggers a task which is waiting to * fetch the data. In this example, the interrupt handler sends an event to * a waiting task to trigger the data gathering. */ static QueueHandle_t gpio_evt_queue = NULL; // User task that fetches the sensor values. void user_task_interrupt (void *pvParameters) { uint8_t gpio_num; while (1) { if (xQueueReceive(gpio_evt_queue, &gpio_num, portMAX_DELAY)) { lis3dh_int_data_source_t data_src = {}; lis3dh_int_event_source_t event_src = {}; lis3dh_int_click_source_t click_src = {}; // get the source of the interrupt and reset *INTx* signals #ifdef INT_DATA lis3dh_get_int_data_source (sensor, &data_src); #endif #ifdef INT_EVENT lis3dh_get_int_event_source (sensor, &event_src, lis3dh_int_event1_gen); #endif #ifdef INT_CLICK lis3dh_get_int_click_source (sensor, &click_src); #endif // in case of DRDY interrupt or inertial event interrupt read one data sample if (data_src.data_ready) read_data (); // in case of FIFO interrupts read the whole FIFO else if (data_src.fifo_watermark || data_src.fifo_overrun) read_data (); // in case of event interrupt else if (event_src.active) { printf("%.3f LIS3DH ", (double)sdk_system_get_time()*1e-3); if (event_src.x_low) printf("x is lower than threshold\n"); if (event_src.y_low) printf("y is lower than threshold\n"); if (event_src.z_low) printf("z is lower than threshold\n"); if (event_src.x_high) printf("x is higher than threshold\n"); if (event_src.y_high) printf("y is higher than threshold\n"); if (event_src.z_high) printf("z is higher than threshold\n"); } // in case of click detection interrupt else if (click_src.active) printf("%.3f LIS3DH %s\n", (double)sdk_system_get_time()*1e-3, click_src.s_click ? "single click" : "double click"); } } } // Interrupt handler which resumes user_task_interrupt on interrupt void IRAM int_signal_handler (uint8_t gpio) { // send an event with GPIO to the interrupt user task xQueueSendFromISR(gpio_evt_queue, &gpio, NULL); } #else // !INT_USED /* * In this example, user task fetches the sensor values every seconds. */ void user_task_periodic(void *pvParameters) { vTaskDelay (100/portTICK_PERIOD_MS); while (1) { // read sensor data read_data (); // passive waiting until 1 second is over vTaskDelay(100/portTICK_PERIOD_MS); } } #endif // INT_USED /* -- main program ------------------------------------------------- */ void user_init(void) { // Set UART Parameter. uart_set_baud(0, 115200); // Give the UART some time to settle vTaskDelay(1); /** -- MANDATORY PART -- */ #ifdef SPI_USED // init the sensor connnected to SPI spi_bus_init (SPI_BUS, SPI_SCK_GPIO, SPI_MISO_GPIO, SPI_MOSI_GPIO); // init the sensor connected to SPI_BUS with SPI_CS_GPIO as chip select. sensor = lis3dh_init_sensor (SPI_BUS, 0, SPI_CS_GPIO); #else // init all I2C bus interfaces at which LIS3DH sensors are connected i2c_init (I2C_BUS, I2C_SCL_PIN, I2C_SDA_PIN, I2C_FREQ); // init the sensor with slave address LIS3DH_I2C_ADDRESS_1 connected to I2C_BUS. sensor = lis3dh_init_sensor (I2C_BUS, LIS3DH_I2C_ADDRESS_1, 0); #endif if (sensor) { #ifdef INT_USED /** --- INTERRUPT CONFIGURATION PART ---- */ // Interrupt configuration has to be done before the sensor is set // into measurement mode to avoid losing interrupts // create an event queue to send interrupt events from interrupt // handler to the interrupt task gpio_evt_queue = xQueueCreate(10, sizeof(uint8_t)); // configure interupt pins for *INT1* and *INT2* signals and set the interrupt handler gpio_enable(INT1_PIN, GPIO_INPUT); gpio_set_interrupt(INT1_PIN, GPIO_INTTYPE_EDGE_POS, int_signal_handler); #endif // INT_USED /** -- SENSOR CONFIGURATION PART --- */ // set polarity of INT signals if necessary // lis3dh_config_int_signals (sensor, lis3dh_high_active); #ifdef INT_DATA // enable data interrupts on INT1 (data ready or FIFO status interrupts) // data ready and FIFO status interrupts must not be enabled at the same time #ifdef FIFO_MODE lis3dh_enable_int (sensor, lis3dh_int_fifo_overrun , lis3dh_int1_signal, true); lis3dh_enable_int (sensor, lis3dh_int_fifo_watermark, lis3dh_int1_signal, true); #else lis3dh_enable_int (sensor, lis3dh_int_data_ready, lis3dh_int1_signal, true); #endif // FIFO_MODE #endif // INT_DATA #ifdef INT_EVENT // enable data interrupts on INT1 lis3dh_int_event_config_t event_config; event_config.mode = lis3dh_wake_up; // event_config.mode = lis3dh_free_fall; // event_config.mode = lis3dh_6d_movement; // event_config.mode = lis3dh_6d_position; // event_config.mode = lis3dh_4d_movement; // event_config.mode = lis3dh_4d_position; event_config.threshold = 10; event_config.x_low_enabled = false; event_config.x_high_enabled = true; event_config.y_low_enabled = false; event_config.y_high_enabled = true; event_config.z_low_enabled = false; event_config.z_high_enabled = true; event_config.duration = 0; event_config.latch = true; lis3dh_set_int_event_config (sensor, &event_config, lis3dh_int_event1_gen); lis3dh_enable_int (sensor, lis3dh_int_event1, lis3dh_int1_signal, true); #endif // INT_EVENT #ifdef INT_CLICK // enable click interrupt on INT1 lis3dh_int_click_config_t click_config; click_config.threshold = 10; click_config.x_single = false; click_config.x_double = false; click_config.y_single = false; click_config.y_double = false; click_config.z_single = true; click_config.z_double = false; click_config.latch = true; click_config.time_limit = 1; click_config.time_latency = 1; click_config.time_window = 3; lis3dh_set_int_click_config (sensor, &click_config); lis3dh_enable_int (sensor, lis3dh_int_click, lis3dh_int1_signal, true); #endif // INT_CLICK #ifdef FIFO_MODE // clear FIFO and activate FIFO mode if needed lis3dh_set_fifo_mode (sensor, lis3dh_bypass, 0, lis3dh_int1_signal); lis3dh_set_fifo_mode (sensor, lis3dh_stream, 10, lis3dh_int1_signal); #endif // configure HPF and reset the reference by dummy read lis3dh_config_hpf (sensor, lis3dh_hpf_normal, 0, true, true, true, true); lis3dh_get_hpf_ref (sensor); // enable ADC inputs and temperature sensor for ADC input 3 lis3dh_enable_adc (sensor, true, true); // LAST STEP: Finally set scale and mode to start measurements lis3dh_set_scale(sensor, lis3dh_scale_2_g); lis3dh_set_mode (sensor, lis3dh_odr_10, lis3dh_high_res, true, true, true); /** -- TASK CREATION PART --- */ // must be done last to avoid concurrency situations with the sensor // configuration part #ifdef INT_USED // create a task that is triggered only in case of interrupts to fetch the data xTaskCreate(user_task_interrupt, "user_task_interrupt", TASK_STACK_DEPTH, NULL, 2, NULL); #else // INT_USED // create a user task that fetches data from sensor periodically xTaskCreate(user_task_periodic, "user_task_periodic", TASK_STACK_DEPTH, NULL, 2, NULL); #endif } else printf("Could not initialize LIS3DH sensor\n"); }