Rate limiter

Rate limiter implementation in C for general DSP purposes. Module works on floating point numbers and support configuration of rise and fall rate of signals.

Rate limiter memory space is dynamically allocated and success of allocation is taken into consideration before using that instance.

Dependencies

Definition of float32_t must be provided by user. In current implementation it is defined in "project_config.h". Just add following statement to your code where it suits the best.

// Define float
typedef float float32_t;

API

• rate_limiter_status_t rate_limiter_init(p_rate_limiter * p_rl_inst, const float32_t rise_rate, const float32_t fall_rate, const float32_t dt);
• float32_t rate_limiter_update(p_rate_limiter rl_inst, const float32_t x);
• bool rate_limiter_is_init(p_rate_limiter rl_inst);
• rate_limiter_status_t rate_limiter_change_rate(p_rate_limiter rl_inst, const float32_t rise_rate, const float32_t fall_rate);

Example of usage

// 1. Declare rate limiter instance
p_rate_limiter my_rate_limiter_inst = NULL;

/* 
*   2. Init rate limiter with following parameters:
*   - rise = 1.0 unit/sec
*   - fall = 0.5 unit/sec
*   - dt = 0.01 sec --> SAMPLE PERIOD
*/ 
if ( eRATE_LIMITER_OK != rate_limiter_init( &my_rate_limiter_inst, 1.0f, 0.5f, 0.01f ))
{
    // Rate limiter init failed
    // Further actions here...
}

// 3. Apply rate limiter in period of 10ms
loop @SAMPLE_TIME
{
    // Update rate limiter
    slew_rate_limited_signal = rate_limiter_update( my_rate_limiter_inst, raw_signal );
}