baudrate_monitor.c File Reference

#include "baudrate_monitor.h"
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "hardware/gpio.h"
#include "hardware/sync.h"
#include "hardware/timer.h"
#include "pico/time.h"
#include "pico/types.h"
#include "platform/pinmap.h"
#include "system/common.h"

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Macros
#define	PIN_COUNT   25
#define	BAUD_STALE_US   50000U
#define	BAUD_TIMER_MS   20
#define	BAUD_EMA_ALPHA   0.2F

Functions
static void	rxc_edge_isr (uint gpio, uint32_t events)
float	baudrate_estimator_get_current_estimation (V24_PIN_T pin)
	Get latest baudrate estimate.
static bool	baud_timer_cb (repeating_timer_t *timer)
void	baudrate_estimator_init (V24_PIN_T pin)
	Initialize baudrate estimator on a specific RX clock pin.

Variables
static volatile uint32_t	edge_count [PIN_COUNT] = {0}
static repeating_timer_t	baud_timer
static volatile bool	baud_ready [PIN_COUNT] = {false}
static volatile float	baud_hz [PIN_COUNT] = {0.0F}
static size_t	current_pin_count = 0
static volatile uint8_t	monitored_pin [PIN_COUNT] = {0}
static volatile uint64_t	first_edge_time_us [PIN_COUNT] = {0}
static volatile uint64_t	last_edge_time_us [PIN_COUNT] = {0}

Macro Definition Documentation

BAUD_EMA_ALPHA

#define BAUD_EMA_ALPHA   0.2F

Definition at line 40 of file baudrate_monitor.c.

BAUD_STALE_US

#define BAUD_STALE_US   50000U

Definition at line 36 of file baudrate_monitor.c.

BAUD_TIMER_MS

#define BAUD_TIMER_MS   20

Definition at line 38 of file baudrate_monitor.c.

PIN_COUNT

#define PIN_COUNT   25

Definition at line 34 of file baudrate_monitor.c.

Function Documentation

baud_timer_cb()

static bool baud_timer_cb ( repeating_timer_t *  timer )

static

Definition at line 71 of file baudrate_monitor.c.

References BAUD_EMA_ALPHA, baud_hz, baud_ready, BAUD_STALE_US, current_pin_count, edge_count, first_edge_time_us, last_edge_time_us, monitored_pin, and US_PER_SECOND.

Referenced by baudrate_estimator_init().

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baudrate_estimator_get_current_estimation()

float baudrate_estimator_get_current_estimation

(

V24_PIN_T

pin

)

Get latest baudrate estimate.

Parameters

pin	V.24 clock pin being monitored.

Returns

Estimated baudrate in Hz.

Definition at line 65 of file baudrate_monitor.c.

References baud_hz, and baud_ready.

Referenced by print_status_event().

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baudrate_estimator_init()

void baudrate_estimator_init

(

V24_PIN_T

pin

)

Initialize baudrate estimator on a specific RX clock pin.

Parameters

pin	V.24 clock pin to monitor.

Definition at line 118 of file baudrate_monitor.c.

References baud_timer, baud_timer_cb(), BAUD_TIMER_MS, current_pin_count, monitored_pin, PIN_COUNT, and rxc_edge_isr().

Referenced by main().

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rxc_edge_isr()

static void rxc_edge_isr ( uint  gpio, uint32_t  events  )

static

Definition at line 51 of file baudrate_monitor.c.

References edge_count, first_edge_time_us, and last_edge_time_us.

Referenced by baudrate_estimator_init().

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Variable Documentation

baud_hz

volatile float baud_hz[PIN_COUNT] = {0.0F}

static

Definition at line 44 of file baudrate_monitor.c.

Referenced by baud_timer_cb(), and baudrate_estimator_get_current_estimation().

baud_ready

volatile bool baud_ready[PIN_COUNT] = {false}

static

Definition at line 43 of file baudrate_monitor.c.

Referenced by baud_timer_cb(), and baudrate_estimator_get_current_estimation().

baud_timer

repeating_timer_t baud_timer

static

Definition at line 42 of file baudrate_monitor.c.

Referenced by baudrate_estimator_init().

current_pin_count

size_t current_pin_count = 0

static

Definition at line 45 of file baudrate_monitor.c.

Referenced by baud_timer_cb(), and baudrate_estimator_init().

edge_count

volatile uint32_t edge_count[PIN_COUNT] = {0}

static

Definition at line 41 of file baudrate_monitor.c.

Referenced by baud_timer_cb(), and rxc_edge_isr().

first_edge_time_us

volatile uint64_t first_edge_time_us[PIN_COUNT] = {0}

static

Definition at line 48 of file baudrate_monitor.c.

Referenced by baud_timer_cb(), and rxc_edge_isr().

last_edge_time_us

volatile uint64_t last_edge_time_us[PIN_COUNT] = {0}

static

Definition at line 49 of file baudrate_monitor.c.

Referenced by baud_timer_cb(), and rxc_edge_isr().

monitored_pin

volatile uint8_t monitored_pin[PIN_COUNT] = {0}

static

Definition at line 46 of file baudrate_monitor.c.

Referenced by baud_timer_cb(), and baudrate_estimator_init().