New kernel drivers, filesystem API, and more (#513)
* **New Features** * BMI270 6-axis IMU driver added; new unified filesystem abstraction for mounted filesystems. * Public Wi‑Fi API surface (no implementation yet) * SDMMC driver added (kernel drive$) * expanded GPIO interrupt/callback support * **Improvements** * M5Stack Tab5: revamped GPIO/power initialization and IMU integration. * LVGL updates including device fontSize configuration. * Updated all code related to SD card device/fs handling * Rename LilyGO T-HMI S3 to LilyGO T-HMI * **Bug Fixes** * Simplified and consolidated SD card handling and mount discovery.
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Ken Van Hoeylandt
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GitHub
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// SPDX-License-Identifier: Apache-2.0
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#include <drivers/bmi270.h>
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#include <bmi270_module.h>
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#include <drivers/bmi270_config_data.h>
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#include <tactility/device.h>
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#include <tactility/drivers/i2c_controller.h>
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#include <tactility/log.h>
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#define TAG "BMI270"
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static constexpr uint8_t REG_CHIP_ID = 0x00; // read: expect 0x24
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static constexpr uint8_t REG_DATA_ACC = 0x0C; // 6 bytes: acc X/Y/Z LSB/MSB
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static constexpr uint8_t REG_DATA_GYR = 0x12; // 6 bytes: gyr X/Y/Z LSB/MSB
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static constexpr uint8_t REG_INTERNAL_ST = 0x21; // bit0: init done
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static constexpr uint8_t REG_ACC_CONF = 0x40; // ODR + BWP + filter_perf
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static constexpr uint8_t REG_ACC_RANGE = 0x41; // range selector
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static constexpr uint8_t REG_GYR_CONF = 0x42; // ODR + BWP
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static constexpr uint8_t REG_GYR_RANGE = 0x43; // range selector
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static constexpr uint8_t REG_INIT_CTRL = 0x59; // 0=start upload, 1=done
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static constexpr uint8_t REG_INIT_ADDR_0 = 0x5B; // burst address low nibble
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// REG_INIT_ADDR_1 = 0x5C written together with 0x5B (2-byte burst)
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static constexpr uint8_t REG_INIT_DATA = 0x5E; // config burst write target
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static constexpr uint8_t REG_PWR_CONF = 0x7C; // 0=disable adv. power save
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static constexpr uint8_t REG_PWR_CTRL = 0x7D; // bit1=gyr_en, bit2=acc_en
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static constexpr uint8_t REG_CMD = 0x7E; // 0xB6 = soft reset
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// ACC_CONF: filter_perf=1, bwp=normal(2), odr=100Hz(8) → 0xA8
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static constexpr uint8_t ACC_CONF_VAL = 0xA8;
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static constexpr uint8_t ACC_RANGE_VAL = 0x02; // ±8g
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// GYR_CONF: filter_perf=1, noise_perf=1, bwp=normal(2), odr=100Hz(8) → 0xE8
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static constexpr uint8_t GYR_CONF_VAL = 0xE8;
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static constexpr uint8_t GYR_RANGE_VAL = 0x00; // ±2000°/s
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// Scaling: full-scale / 2^15
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static constexpr float ACCEL_SCALE = 8.0f / 32768.0f; // g per LSB (±8g)
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static constexpr float GYRO_SCALE = 2000.0f / 32768.0f; // °/s per LSB (±2000°/s)
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// Config upload chunk size (bytes of config data per I2C transaction)
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static constexpr size_t CHUNK_SIZE = 64;
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static constexpr TickType_t I2C_TIMEOUT_TICKS = pdMS_TO_TICKS(10);
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#define GET_CONFIG(device) (static_cast<const Bmi270Config*>((device)->config))
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// region Helpers
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static bool configure(Device* i2c_controller, uint8_t address) {
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// Disable advanced power save before uploading
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if (i2c_controller_register8_set(i2c_controller, address, REG_PWR_CONF, 0x00, I2C_TIMEOUT_TICKS) != ERROR_NONE) return false;
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vTaskDelay(pdMS_TO_TICKS(1));
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// Signal start of config upload
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if (i2c_controller_register8_set(i2c_controller, address, REG_INIT_CTRL, 0x00, I2C_TIMEOUT_TICKS) != ERROR_NONE) return false;
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// Upload config in CHUNK_SIZE-byte bursts
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// The half-word address (hwAddr) increments by CHUNK_SIZE/2 per chunk
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constexpr size_t config_data_size = sizeof(bmi270_config_data);
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for (size_t offset = 0; offset < config_data_size; offset += CHUNK_SIZE) {
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// Set INIT_ADDR_0 and INIT_ADDR_1 (consecutive registers 0x5B/0x5C)
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auto hardware_address = static_cast<uint16_t>(offset / 2);
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uint8_t address_buffer[2] = {
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static_cast<uint8_t>(hardware_address & 0x0Fu), // INIT_ADDR_0: bits [3:0]
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static_cast<uint8_t>((hardware_address >> 4) & 0xFFu) // INIT_ADDR_1: bits [11:4]
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};
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if (i2c_controller_write_register(i2c_controller, address, REG_INIT_ADDR_0, address_buffer, 2, I2C_TIMEOUT_TICKS) != ERROR_NONE) return false;
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// Write chunk to INIT_DATA register.
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// Copy to a stack buffer first: the config array may live in DROM (SPI flash)
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// which is not DMA-accessible; the I2C driver requires DRAM-backed buffers.
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size_t chunk_length = (offset + CHUNK_SIZE <= config_data_size) ? CHUNK_SIZE : (config_data_size - offset);
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uint8_t chunk_buffer[CHUNK_SIZE];
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memcpy(chunk_buffer, bmi270_config_data + offset, chunk_length);
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if (i2c_controller_write_register(i2c_controller, address, REG_INIT_DATA, chunk_buffer, static_cast<uint16_t>(chunk_length), I2C_TIMEOUT_TICKS) != ERROR_NONE) return false;
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}
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// Signal end of config upload
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if (i2c_controller_register8_set(i2c_controller, address, REG_INIT_CTRL, 0x01, I2C_TIMEOUT_TICKS) != ERROR_NONE) return false;
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vTaskDelay(pdMS_TO_TICKS(20));
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// Verify initialization
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uint8_t status = 0;
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if (i2c_controller_register8_get(i2c_controller, address, REG_INTERNAL_ST, &status, I2C_TIMEOUT_TICKS) != ERROR_NONE) return false;
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return (status & 0x01u) != 0; // bit 0 = init_ok
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}
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// endregion
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// region Driver lifecycle
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static error_t start(Device* device) {
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auto* i2c_controller = device_get_parent(device);
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if (device_get_type(i2c_controller) != &I2C_CONTROLLER_TYPE) {
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LOG_E(TAG, "Parent is not an I2C controller");
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return ERROR_RESOURCE;
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}
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auto address = GET_CONFIG(device)->address;
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// Verify chip ID
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uint8_t chip_id= 0;
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if (i2c_controller_register8_get(i2c_controller, address, REG_CHIP_ID, &chip_id, I2C_TIMEOUT_TICKS) != ERROR_NONE || chip_id != 0x24) {
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return ERROR_RESOURCE;
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}
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// Soft reset — clears all registers; datasheet specifies 2 ms startup time.
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// Use 20 ms to be safe and allow the chip to fully re-initialise before
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// any further I2C traffic (a second chip-ID read immediately after reset
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// is unreliable and not part of the Bosch SensorAPI init flow).
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if (i2c_controller_register8_set(i2c_controller, address, REG_CMD, 0xB6, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;
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vTaskDelay(pdMS_TO_TICKS(20));
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// Upload 8KB configuration (enables internal feature engine)
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if (!configure(i2c_controller, address)) {
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return ERROR_RESOURCE;
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}
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// Configure accelerometer: ODR=100Hz, normal filter, ±8g
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if (i2c_controller_register8_set(i2c_controller, address, REG_ACC_CONF, ACC_CONF_VAL, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;
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if (i2c_controller_register8_set(i2c_controller, address, REG_ACC_RANGE, ACC_RANGE_VAL, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;
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// Configure gyroscope: ODR=100Hz, normal filter, ±2000°/s
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if (i2c_controller_register8_set(i2c_controller, address, REG_GYR_CONF, GYR_CONF_VAL, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;
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if (i2c_controller_register8_set(i2c_controller, address, REG_GYR_RANGE, GYR_RANGE_VAL, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;
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// Enable accelerometer and gyroscope (bit1=gyr_en, bit2=acc_en)
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if (i2c_controller_register8_set(i2c_controller, address, REG_PWR_CTRL, 0x06, I2C_TIMEOUT_TICKS) != ERROR_NONE) return ERROR_RESOURCE;
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vTaskDelay(pdMS_TO_TICKS(2));
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return ERROR_NONE;
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}
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static error_t stop(Device* device) {
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return ERROR_NONE;
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}
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// endregion
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extern "C" {
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error_t bmi270_read(Device* device, Bmi270Data* data) {
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auto* i2c_controller = device_get_parent(device);
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auto address = GET_CONFIG(device)->address;
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// Burst-read 12 bytes: acc X/Y/Z (6 bytes) + gyro X/Y/Z (6 bytes)
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// Registers: 0x0C–0x17 are contiguous for acc+gyro in I2C mode (no dummy byte)
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uint8_t buffer[12] = {};
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error_t error = i2c_controller_read_register(i2c_controller, address, REG_DATA_ACC, buffer, sizeof(buffer), I2C_TIMEOUT_TICKS);
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if (error != ERROR_NONE) return error;
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auto toI16 = [](uint8_t lo, uint8_t hi) -> int16_t {
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return static_cast<int16_t>(static_cast<uint16_t>(hi) << 8 | lo);
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};
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data->ax = toI16(buffer[0], buffer[1]) * ACCEL_SCALE;
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data->ay = toI16(buffer[2], buffer[3]) * ACCEL_SCALE;
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data->az = toI16(buffer[4], buffer[5]) * ACCEL_SCALE;
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data->gx = toI16(buffer[6], buffer[7]) * GYRO_SCALE;
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data->gy = toI16(buffer[8], buffer[9]) * GYRO_SCALE;
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data->gz = toI16(buffer[10], buffer[11]) * GYRO_SCALE;
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return ERROR_NONE;
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}
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Driver bmi270_driver = {
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.name = "bmi270",
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.compatible = (const char*[]) { "bosch,bmi270", nullptr},
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.start_device = start,
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.stop_device = stop,
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.api = nullptr,
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.device_type = nullptr,
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.owner = &bmi270_module,
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.internal = nullptr
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};
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}
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