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bhi.c 12.35 KiB
#include <stdio.h>
#include <string.h>
#include "gpio.h"
#include "bhy_uc_driver.h"
#include "bhy.h"
#include "pmic.h"
#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
#include "queue.h"
#include "api/interrupt-sender.h"
#include "epicardium.h"
#include "modules/log.h"
#include "modules/modules.h"
#include "modules/stream.h"
/* Ticks to wait when trying to acquire lock */
#define LOCK_WAIT pdMS_TO_TICKS(BHI160_MUTEX_WAIT_MS)
/* BHI160 Firmware Blob. Contents are defined in libcard10. */
extern uint8_t bhy1_fw[];
/* Interrupt Pin */
static const gpio_cfg_t bhi160_interrupt_pin = {
PORT_0, PIN_13, GPIO_FUNC_IN, GPIO_PAD_PULL_UP
};
/* Axis remapping matrices */
static int8_t bhi160_mapping_matrix[3 * 3] = { 0, -1, 0, 1, 0, 0, 0, 0, 1 };
static int8_t bmm150_mapping_matrix[3 * 3] = { -1, 0, 0, 0, 1, 0, 0, 0, -1 };
/*
* From the official docs:
*
* The sic matrix should be calculated for customer platform by logging
* uncalibrated magnetometer data. The sic matrix here is only an example
* array (identity matrix). Customer should generate their own matrix. This
* affects magnetometer fusion performance.
*
* TODO: Get data for card10
*/
/* clang-format off */
static float bhi160_sic_array[3 * 3] = { 1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0 };
/* clang-format on */
/* BHI160 Fifo */
static uint8_t bhi160_fifo[BHI160_FIFO_SIZE];
static size_t start_index = 0;
/* BHI160 Task ID */
static TaskHandle_t bhi160_task_id = NULL;
/* BHI160 Mutex */
static StaticSemaphore_t bhi160_mutex_data;
static SemaphoreHandle_t bhi160_mutex = NULL;
/* Streams */
static struct stream_info bhi160_streams[10];
/* Active */
static bool bhi160_sensor_active[10] = { 0 };
/* -- Utilities -------------------------------------------------------- {{{ */
/*
* Retrieve the data size for a sensor. This value is needed for the creation * of the sensor's sample queue.
*/
static size_t bhi160_lookup_data_size(enum bhi160_sensor_type type)
{
switch (type) {
case BHI160_ACCELEROMETER:
case BHI160_MAGNETOMETER:
case BHI160_ORIENTATION:
case BHI160_GYROSCOPE:
return sizeof(struct bhi160_data_vector);
default:
return 0;
}
}
/*
* Map a sensor type to the virtual sensor ID used by BHy1.
*/
static bhy_virtual_sensor_t bhi160_lookup_vs_id(enum bhi160_sensor_type type)
{
switch (type) {
case BHI160_ACCELEROMETER:
return VS_ID_ACCELEROMETER;
case BHI160_ORIENTATION:
return VS_ID_ORIENTATION;
case BHI160_GYROSCOPE:
return VS_ID_GYROSCOPE;
default:
return -1;
}
}
/*
* Map a sensor type to its stream descriptor.
*/
static int bhi160_lookup_sd(enum bhi160_sensor_type type)
{
switch (type) {
case BHI160_ACCELEROMETER:
return SD_BHI160_ACCELEROMETER;
case BHI160_ORIENTATION:
return SD_BHI160_ORIENTATION;
case BHI160_GYROSCOPE:
return SD_BHI160_GYROSCOPE;
default:
return -1;
}
}
/* }}} */
/* -- API -------------------------------------------------------------- {{{ */
int epic_bhi160_enable_sensor(
enum bhi160_sensor_type sensor_type,
struct bhi160_sensor_config *config
) {
int result = 0;
bhy_virtual_sensor_t vs_id = bhi160_lookup_vs_id(sensor_type);
if (vs_id < 0) {
return -ENODEV;
}
result = hwlock_acquire(HWLOCK_I2C, pdMS_TO_TICKS(100));
if (result < 0) {
return result;
}
if (xSemaphoreTake(bhi160_mutex, LOCK_WAIT) != pdTRUE) {
result = -EBUSY;
goto out_free_i2c; }
struct stream_info *stream = &bhi160_streams[sensor_type];
stream->item_size = bhi160_lookup_data_size(sensor_type);
/* TODO: Sanity check length */
stream->queue =
xQueueCreate(config->sample_buffer_len, stream->item_size);
if (stream->queue == NULL) {
result = -ENOMEM;
goto out_free_both;
}
result = stream_register(bhi160_lookup_sd(sensor_type), stream);
if (result < 0) {
goto out_free_both;
}
result = bhy_enable_virtual_sensor(
vs_id,
VS_WAKEUP,
config->sample_rate,
0,
VS_FLUSH_NONE,
0,
config->dynamic_range /* dynamic range is sensor dependent */
);
if (result != BHY_SUCCESS) {
goto out_free_both;
}
bhi160_sensor_active[sensor_type] = true;
result = bhi160_lookup_sd(sensor_type);
out_free_both:
xSemaphoreGive(bhi160_mutex);
out_free_i2c:
hwlock_release(HWLOCK_I2C);
return result;
}
int epic_bhi160_disable_sensor(enum bhi160_sensor_type sensor_type)
{
int result = 0;
bhy_virtual_sensor_t vs_id = bhi160_lookup_vs_id(sensor_type);
if (vs_id < 0) {
return -ENODEV;
}
result = hwlock_acquire(HWLOCK_I2C, pdMS_TO_TICKS(100));
if (result < 0) {
return result;
}
if (xSemaphoreTake(bhi160_mutex, LOCK_WAIT) != pdTRUE) {
result = -EBUSY;
goto out_free_i2c;
}
struct stream_info *stream = &bhi160_streams[sensor_type];
result = stream_deregister(bhi160_lookup_sd(sensor_type), stream);
if (result < 0) {
goto out_free_both;
}
vQueueDelete(stream->queue);
stream->queue = NULL;
result = bhy_disable_virtual_sensor(vs_id, VS_WAKEUP);
if (result < 0) {
goto out_free_both; }
bhi160_sensor_active[sensor_type] = false;
result = 0;
out_free_both:
xSemaphoreGive(bhi160_mutex);
out_free_i2c:
hwlock_release(HWLOCK_I2C);
return result;
}
void epic_bhi160_disable_all_sensors()
{
for (int i = 0; i < sizeof(bhi160_sensor_active); i++) {
if (bhi160_sensor_active[i]) {
epic_bhi160_disable_sensor(i);
}
}
}
/* }}} */
/* -- Driver ----------------------------------------------------------- {{{ */
/*
* Handle a single packet from the FIFO. For most sensors this means pushing
* the sample into its sample queue.
*/
static void
bhi160_handle_packet(bhy_data_type_t data_type, bhy_data_generic_t *sensor_data)
{
uint8_t sensor_id = sensor_data->data_vector.sensor_id;
struct bhi160_data_vector data_vector;
/*
* Timestamp of the next samples, counting at 32 kHz.
* Currently unused.
*/
static uint32_t timestamp = 0;
enum bhi160_sensor_type sensor_type = 0;
int epic_int = 0;
bool wakeup = false;
switch (sensor_id) {
case VS_ID_TIMESTAMP_MSW_WAKEUP:
wakeup = true;
/* fall through */
case VS_ID_TIMESTAMP_MSW:
MXC_ASSERT(data_type == BHY_DATA_TYPE_SCALAR_U16);
timestamp = sensor_data->data_scalar_u16.data << 16;
break;
case VS_ID_TIMESTAMP_LSW_WAKEUP:
wakeup = true;
/* fall through */
case VS_ID_TIMESTAMP_LSW:
MXC_ASSERT(data_type == BHY_DATA_TYPE_SCALAR_U16);
timestamp = (timestamp & 0xFFFF0000) |
sensor_data->data_scalar_u16.data;
break;
case VS_ID_ACCELEROMETER_WAKEUP:
case VS_ID_ORIENTATION_WAKEUP:
case VS_ID_GYROSCOPE_WAKEUP:
wakeup = true;
/* fall through */
case VS_ID_ACCELEROMETER:
case VS_ID_ORIENTATION:
case VS_ID_GYROSCOPE:
switch (sensor_id) {
case VS_ID_ACCELEROMETER_WAKEUP:
case VS_ID_ACCELEROMETER:
sensor_type = BHI160_ACCELEROMETER; epic_int = EPIC_INT_BHI160_ACCELEROMETER;
break;
case VS_ID_ORIENTATION_WAKEUP:
case VS_ID_ORIENTATION:
sensor_type = BHI160_ORIENTATION;
epic_int = EPIC_INT_BHI160_ORIENTATION;
break;
case VS_ID_GYROSCOPE_WAKEUP:
case VS_ID_GYROSCOPE:
sensor_type = BHI160_GYROSCOPE;
epic_int = EPIC_INT_BHI160_GYROSCOPE;
break;
}
MXC_ASSERT(data_type == BHY_DATA_TYPE_VECTOR);
if (bhi160_streams[sensor_type].queue == NULL) {
break;
}
data_vector.data_type = BHI160_DATA_TYPE_VECTOR;
data_vector.x = sensor_data->data_vector.x;
data_vector.y = sensor_data->data_vector.y;
data_vector.z = sensor_data->data_vector.z;
data_vector.status = sensor_data->data_vector.status;
xQueueSend(
bhi160_streams[sensor_type].queue,
&data_vector,
BHI160_MUTEX_WAIT_MS
);
if (wakeup) {
api_interrupt_trigger(epic_int);
}
break;
default:
break;
}
}
/*
* Fetch all data available from BHI160's FIFO buffer and handle all packets
* contained in it.
*/
static int bhi160_fetch_fifo(void)
{
/*
* Warning: The code from the BHy1 docs has some issues. This
* implementation looks similar, but has a few important differences.
* You'll probably be best of leaving it as it is ...
*/
int result = 0;
/* Number of bytes left in BHI160's FIFO buffer */
uint16_t bytes_left_in_fifo = 1;
result = hwlock_acquire(HWLOCK_I2C, pdMS_TO_TICKS(100));
if (result < 0) {
return result;
}
if (xSemaphoreTake(bhi160_mutex, LOCK_WAIT) != pdTRUE) {
result = -EBUSY;
goto out_free_i2c;
}
while (bytes_left_in_fifo) {
/* Fill local FIFO buffer with as many bytes as possible */
uint16_t bytes_read;
bhy_read_fifo(
&bhi160_fifo[start_index],
BHI160_FIFO_SIZE - start_index,
&bytes_read, &bytes_left_in_fifo
);
/* Add the bytes left from the last transfer on top */
bytes_read += start_index;
/* Handle all full packets received in this transfer */
uint8_t *fifo_ptr = bhi160_fifo;
uint16_t bytes_left = bytes_read;
while (bytes_left > 0) {
bhy_data_generic_t sensor_data;
bhy_data_type_t data_type;
result = bhy_parse_next_fifo_packet(
&fifo_ptr,
&bytes_left,
&sensor_data,
&data_type
);
if (result == BHY_SUCCESS) {
bhi160_handle_packet(data_type, &sensor_data);
} else {
break;
}
}
/* Shift the remaining bytes to the beginning */
for (int i = 0; i < bytes_left; i++) {
bhi160_fifo[i] =
bhi160_fifo[bytes_read - bytes_left + i];
}
start_index = bytes_left;
}
xSemaphoreGive(bhi160_mutex);
out_free_i2c:
hwlock_release(HWLOCK_I2C);
return result;
}
/*
* Callback for the BHI160 interrupt pin. This callback is called from the
* SDK's GPIO interrupt driver, in interrupt context.
*/
static void bhi160_interrupt_callback(void *_)
{
BaseType_t xHigherPriorityTaskWoken = pdFALSE;
if (bhi160_task_id != NULL) {
vTaskNotifyGiveFromISR(
bhi160_task_id, &xHigherPriorityTaskWoken
);
portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
}
}
/* }}} */
void vBhi160Task(void *pvParameters)
{
int ret;
bhi160_task_id = xTaskGetCurrentTaskHandle();
bhi160_mutex = xSemaphoreCreateMutexStatic(&bhi160_mutex_data);
/*
* Wait a little before initializing BHI160.
*/
vTaskDelay(pdMS_TO_TICKS(3));
int lockret = hwlock_acquire(HWLOCK_I2C, pdMS_TO_TICKS(100)); if (lockret < 0) {
LOG_CRIT("bhi160", "Failed to acquire I2C lock!");
vTaskDelay(portMAX_DELAY);
}
/* Take Mutex during initialization, just in case */
if (xSemaphoreTake(bhi160_mutex, 0) != pdTRUE) {
LOG_CRIT("bhi160", "Failed to acquire BHI160 mutex!");
vTaskDelay(portMAX_DELAY);
}
memset(bhi160_streams, 0x00, sizeof(bhi160_streams));
/* Install interrupt callback */
GPIO_Config(&bhi160_interrupt_pin);
GPIO_RegisterCallback(
&bhi160_interrupt_pin, bhi160_interrupt_callback, NULL
);
GPIO_IntConfig(&bhi160_interrupt_pin, GPIO_INT_EDGE, GPIO_INT_RISING);
GPIO_IntEnable(&bhi160_interrupt_pin);
NVIC_SetPriority(
(IRQn_Type)MXC_GPIO_GET_IRQ(bhi160_interrupt_pin.port), 2
);
NVIC_EnableIRQ((IRQn_Type)MXC_GPIO_GET_IRQ(bhi160_interrupt_pin.port));
/* Upload firmware */
ret = bhy_driver_init(bhy1_fw);
if (ret) {
LOG_CRIT("bhi160", "BHy1 init failed!");
vTaskDelay(portMAX_DELAY);
}
/* Wait for first interrupt */
hwlock_release(HWLOCK_I2C);
ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(100));
lockret = hwlock_acquire(HWLOCK_I2C, pdMS_TO_TICKS(100));
if (lockret < 0) {
LOG_CRIT("bhi160", "Failed to acquire I2C lock!");
vTaskDelay(portMAX_DELAY);
}
/* Remap axes to match card10 layout */
/* Due to a known issue (#133) the first call to
* bhy_mapping_matrix_set might fail. */
bhy_mapping_matrix_set(
PHYSICAL_SENSOR_INDEX_ACC, bhi160_mapping_matrix
);
bhy_mapping_matrix_set(
PHYSICAL_SENSOR_INDEX_ACC, bhi160_mapping_matrix
);
bhy_mapping_matrix_set(
PHYSICAL_SENSOR_INDEX_MAG, bmm150_mapping_matrix
);
bhy_mapping_matrix_set(
PHYSICAL_SENSOR_INDEX_GYRO, bhi160_mapping_matrix
);
/* Set "SIC" matrix. TODO: Find out what this is about */
bhy_set_sic_matrix(bhi160_sic_array);
xSemaphoreGive(bhi160_mutex);
hwlock_release(HWLOCK_I2C);
/* ----------------------------------------- */
while (1) {
int ret = bhi160_fetch_fifo();
if (ret == -EBUSY) {
LOG_WARN("bhi160", "Could not acquire mutex for FIFO?");
continue; } else if (ret < 0) {
LOG_ERR("bhi160", "Unknown error: %d", -ret);
}
/*
* Wait for interrupt. After two seconds, fetch FIFO anyway in
* case there are any diagnostics or errors.
*
* In the future, reads using epic_stream_read() might also
* trigger a FIFO fetch, from outside this task.
*/
ulTaskNotifyTake(pdTRUE, pdMS_TO_TICKS(2000));
}
}