Add optional BMA456 accelerometer init on shared I2C bus.

Probe and configure the sensor when present; log and continue boot if init fails so boards without BMA456 still run normally. Co-authored-by: Cursor <cursoragent@cursor.com>
2026-05-18 22:51:32 +02:00
parent 755bdd92d7
commit e5db0b21c7
168 changed files with 42062 additions and 2 deletions
@@ -0,0 +1,96 @@
+/**\
+ * Copyright (c) 2023 Bosch Sensortec GmbH. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ **/
+
+#include <stdio.h>
+#include "bma456_tablet.h"
+#include "common.h"
+
+/******************************************************************************/
+/*!            Function                                                       */
+
+/* This function starts the execution of program. */
+int main(void)
+{
+    /* Variable to store the status of API */
+    int8_t rslt;
+
+    /* Sensor initialization configuration */
+    struct bma4_dev bma = { 0 };
+
+    /* Variable to store step activity interrupt status */
+    uint16_t int_status = 0;
+
+    struct bma456_tablet_low_g_config low_g = { 0 };
+    struct bma456_tablet_low_g_config get_low_g = { 0 };
+
+    /* Interface reference is given as a parameter
+     *         For I2C : BMA4_I2C_INTF
+     *         For SPI : BMA4_SPI_INTF
+     * Variant information given as parameter - BMA45X_VARIANT
+     */
+    rslt = bma4_interface_init(&bma, BMA4_I2C_INTF, BMA45X_VARIANT);
+    bma4_error_codes_print_result("bma4_interface_init", rslt);
+
+    /* Sensor initialization */
+    rslt = bma456_tablet_init(&bma);
+    bma4_error_codes_print_result("bma456_tablet_init status", rslt);
+
+    /* Upload the configuration file to enable the features of the sensor. */
+    rslt = bma456_tablet_write_config_file(&bma);
+    bma4_error_codes_print_result("bma456_tablet_write_config status", rslt);
+
+    /* Enable the accelerometer */
+    rslt = bma4_set_accel_enable(BMA4_ENABLE, &bma);
+    bma4_error_codes_print_result("bma4_set_accel_enable status", rslt);
+
+    low_g.threshold = 0x133;
+    low_g.duration = 0x0;
+    low_g.hysteresis = 0x100;
+
+    rslt = bma456_tablet_set_low_g_config(&low_g, &bma);
+    bma4_error_codes_print_result("bma456_tablet_feature_enable status", rslt);
+
+    rslt = bma456_tablet_get_low_g_config(&get_low_g, &bma);
+    bma4_error_codes_print_result("bma456_tablet_feature_enable status", rslt);
+
+    printf("Low-g Threshold : 0x%x\n\n", get_low_g.threshold);
+
+    /* Enable low-g feature */
+    rslt = bma456_tablet_feature_enable(BMA456_TABLET_LOW_G, 1, &bma);
+    bma4_error_codes_print_result("bma456_tablet_feature_enable status", rslt);
+
+    if (rslt == BMA4_OK)
+    {
+        /* Map the interrupt 1 for low-g detection */
+        rslt = bma456_tablet_map_interrupt(BMA4_INTR1_MAP, BMA456_TABLET_LOW_G_INT, BMA4_ENABLE, &bma);
+        bma4_error_codes_print_result("bma456_tablet_map_interrupt status", rslt);
+
+        if (rslt == BMA4_OK)
+        {
+            printf("Drop the board for low-g\n");
+
+            for (;;)
+            {
+                /* Read interrupt status */
+                rslt = bma456_tablet_read_int_status(&int_status, &bma);
+                bma4_error_codes_print_result("bma456_tablet_read_int_status", rslt);
+
+                /* Filtering only the low-g interrupt */
+                if ((rslt == BMA4_OK) && (int_status & BMA456_TABLET_LOW_G_INT))
+                {
+                    printf("\nLow-g interrupt occurred\n");
+                    break;
+                }
+
+                int_status = 0;
+            }
+        }
+    }
+
+    bma4_coines_deinit();
+
+    return rslt;
+}