MC3630

Operation Flow

1. .begin(): Start sensor operation
2. PIN_SNS_INT interrupt or available(): FIFO queue reaches the specified number of samples
3. .get_que(): Retrieve data from the FIFO queue

Required Procedures for Operation

SPI Bus

No special setup is required.

Sleep Procedure

To allow wake-up via PIN_SNS_INT interrupt, configure the following before entering sleep:

pinMode(PAL_MOT::PIN_SNS_INT, WAKE_FALLING);

Procedure Upon Wake-up

Call the .wakeup() method. This process is handled within the <PAL_MOT> board behavior.

Data Structure

Each sample is stored in a queue smplque of axis_xyzt structures. The x, y, and z members represent the X, Y, and Z axes, respectively.

struct axis_xyzt {
  int16_t x;
  int16_t y;
  int16_t z;
  uint16_t t;
};

Each axis value is stored with 1G equivalent to 1000. The t value represents the sample index, starting from 0 and incrementing with each sample.

Methods

read()

uint8_t read()

Reads data from the semiconductor’s FIFO queue. The return value is the number of bytes read. Use .get_que() to access the queue and retrieve the number of samples stored.

get_que()

smplque<axis_xyzt>& get_que()

Retrieves acceleration samples. The queue is a smplque of axis_xyzt. Once available is true, promptly clear the queue.

Common Methods

setup()

void setup()

setup() is not used for this sensor.

begin(), end()

void begin(uint32_t conf)
void end()

Initializes the sensor with the specified conf.

conf[0:15] (bit 0–15): Sampling mode, conf[16:23] (bit 16–23): Acceleration range, conf[24:31] (bit 24–31): Number of samples before triggering interrupt.

process_ev()

void process_ev(uint32_t arg1, uint32_t arg2 = 0)

process_ev() is not used for this sensor.

available()

bool available()

Returns true when data has been read into the internal queue.

probe()

bool probe()

probe() is not used for this sensor.

wakeup()

void wakeup()

Reinitializes the SPI bus after waking from sleep and reads acceleration data.