MLC functionality on MKSBOX1v1

[bigcoronagigachad]

I have this board with STM32L4R9 and I used CubeMX and Unico-GUI tools to generate a decision tree for MLC in .ucf format. I used a python script to convert this to C uint8_t array as follows:

const uint8_t lsm6dsox_ucf[] = {

0x10, 0x00,

0x11, 0x00,

0x01, 0x80,

0x05, 0x00,

0x17, 0x40,

0x02, 0x11,

...

};

In the generated main function I use my function to upload this array to MLC:

void lsm6dsox_load_ucf_via_spi()

{

size_t ucf_size = sizeof(lsm6dsox_ucf) / sizeof(lsm6dsox_ucf[0]);

for (size_t i = 0; i < ucf_size; i += 2)

{

uint8_t reg = lsm6dsox_ucf[i]; // Register address

uint8_t value = lsm6dsox_ucf[i + 1]; // Register value

lsm6dsox_spi_write(reg, value);

HAL_Delay(10);

}

HAL_Delay(10);

}

void lsm6dsox_spi_write(uint8_t reg, uint8_t value)

{

// The first byte is the register address (with MSB cleared for write).

uint8_t tx_data[2] = {reg & 0x7F, value};

// Pull CS low to select the sensor

HAL_GPIO_WritePin(CS_LSM6DSOX_GPIO_Port, CS_LSM6DSOX_Pin, GPIO_PIN_RESET);

// Send data over SPI

HAL_SPI_Transmit(&hspi1, tx_data, 2, HAL_MAX_DELAY);

// Pull CS high to deselect the sensor

HAL_GPIO_WritePin(CS_LSM6DSOX_GPIO_Port, CS_LSM6DSOX_Pin, GPIO_PIN_SET);

// Small delay for stability

HAL_Delay(10);

}

after which I constantly pool the 0x70 register for decision tree 1 output but it never changes

uint8_t lsm6dsox_spi_read(uint8_t reg)

{

uint8_t tx_data = reg | 0x80;

uint8_t rx_data = 0;

// Pull CS low to select the sensor

HAL_GPIO_WritePin(CS_LSM6DSOX_GPIO_Port, CS_LSM6DSOX_Pin, GPIO_PIN_RESET);

// Transmit the register address and receive the response

HAL_SPI_Transmit(&hspi1, &tx_data, 1, HAL_MAX_DELAY);

HAL_SPI_Receive(&hspi1, &rx_data, 1, HAL_MAX_DELAY);

// Pull CS high to deselect the sensor

HAL_GPIO_WritePin(CS_LSM6DSOX_GPIO_Port, CS_LSM6DSOX_Pin, GPIO_PIN_SET);

return rx_data;

}

When I manually upload the .ucf file using Unico-GUI the gesture detection works and I get changes in the status register on the UI. What am I doing wrong?

[Federica Bossi]

Hi @bigcoronagigachad ,

We suggest to use MEMS Studio instead of Unico.
We see no errors in the code, you could convert the UCF using the “C code generation” function of Unico (or better MEMS Studio).

Also, can you in general read and write? For example, can you read the who am I? Can you turn on the accelerometer and read the data?
To read 0x70 (MLC0_SRC), are you first writing 0x01 to 0x80 to get access to that register? And then you reset it to 0x00 after doing the read to restore access to the main registers?