hx711.c File Reference

Interface for the HX711 sensor. More...

#include "hx711.h"
#include "mcu_periph/gpio.h"
#include "mcu_periph/sys_time.h"
#include "modules/core/abi.h"
#include "modules/datalink/downlink.h"
#include "modules/datalink/telemetry.h"
#include <BOARD_CONFIG>

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Data Structures
struct	hx711_dev_t
struct	hx711_t

Macros
#define	HX711_DEVICES_NB   4
#define	HX711_GAIN   1
#define	HX711_PWM_FREQUENCY   6000000
#define	HX711_DEVICES   {}
#define	HX711_FORCE_SENSOR_ID   ABI_BROADCAST
#define	HX711_DEBUG   false
#define	HX711_PERIOD   (HX711_PWM_FREQUENCY / 50000)

Functions
static void	pwmpcb (PWMDriver *pwmp)
	Callback on the falling edge of the clock signal.
void	hx711_init (void)
void	hx711_event (void)
	Start a measurement and publish the results when possible.

Variables
float	hx711_meas_time = 0
static volatile struct hx711_t	hx711
static PWMConfig	pwmcfg

Detailed Description

Interface for the HX711 sensor.

Definition in file hx711.c.

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Data Structure Documentation

hx711_dev_t

struct hx711_dev_t

Definition at line 68 of file hx711.c.

Data Fields
uint16_t	data_pin
ioportid_t	data_port
int32_t	measurement

hx711_t

struct hx711_t

Definition at line 74 of file hx711.c.

Collaboration diagram for hx711_t:

Data Fields
volatile bool	busy
struct hx711_dev_t	devices[HX711_DEVICES_NB]
volatile bool	measurement_ready
volatile uint8_t	read_bit_idx

Macro Definition Documentation

HX711_DEBUG

#define HX711_DEBUG   false

Definition at line 57 of file hx711.c.

HX711_DEVICES

#define HX711_DEVICES   {}

Definition at line 49 of file hx711.c.

HX711_DEVICES_NB

#define HX711_DEVICES_NB   4

Definition at line 37 of file hx711.c.

HX711_FORCE_SENSOR_ID

#define HX711_FORCE_SENSOR_ID   ABI_BROADCAST

Definition at line 53 of file hx711.c.

HX711_GAIN

#define HX711_GAIN   1

Definition at line 41 of file hx711.c.

HX711_PERIOD

#define HX711_PERIOD   (HX711_PWM_FREQUENCY / 50000)

Definition at line 65 of file hx711.c.

HX711_PWM_FREQUENCY

#define HX711_PWM_FREQUENCY   6000000

Definition at line 45 of file hx711.c.

Function Documentation

hx711_event()

void hx711_event

(

void

)

Start a measurement and publish the results when possible.

Definition at line 135 of file hx711.c.

References hx711_t::busy, hx711_dev_t::data_pin, hx711_dev_t::data_port, DefaultChannel, DefaultDevice, hx711_t::devices, foo, get_sys_time_float(), get_sys_time_usec(), gpio_get(), hx711, HX711_DEVICES_NB, HX711_FORCE_SENSOR_ID, hx711_meas_time, HX711_PERIOD, hx711_dev_t::measurement, hx711_t::measurement_ready, pprzlog_tp, and hx711_t::read_bit_idx.

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hx711_init()

void hx711_init

(

void

)

Definition at line 110 of file hx711.c.

References hx711_t::busy, hx711_dev_t::data_pin, hx711_dev_t::data_port, hx711_t::devices, foo, gpio_setup_input(), gpio_setup_pin_af(), hx711, HX711_DEVICES_NB, hx711_t::measurement_ready, pwmcfg, pwmpcb(), and hx711_t::read_bit_idx.

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pwmpcb()

static void pwmpcb ( PWMDriver *  pwmp )

static

Callback on the falling edge of the clock signal.

Definition at line 197 of file hx711.c.

References hx711_t::busy, dev, hx711_t::devices, foo, gpio_get(), hx711, HX711_DEVICES_NB, HX711_GAIN, hx711_t::measurement_ready, and hx711_t::read_bit_idx.

Referenced by hx711_init().

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Variable Documentation

hx711

volatile struct hx711_t hx711

static

Initial value:

= {
  .busy = false,
  .measurement_ready = false,
  .devices = {
    HX711_DEVICES
  },
  .read_bit_idx = 0
}

Definition at line 85 of file hx711.c.

Referenced by hx711_event(), hx711_init(), and pwmpcb().

hx711_meas_time

float hx711_meas_time = 0

Definition at line 67 of file hx711.c.

Referenced by hx711_event().

pwmcfg

PWMConfig pwmcfg

static

Initial value:

= {
  .frequency = HX711_PWM_FREQUENCY,
  .period = HX711_PERIOD,
  .callback = NULL,
  .channels = {
    { PWM_OUTPUT_DISABLED, NULL },
    { PWM_OUTPUT_DISABLED, NULL },
    { PWM_OUTPUT_DISABLED, NULL },
    { PWM_OUTPUT_DISABLED, NULL },
  },
  .cr2 = 0,
  .bdtr = 0,
  .dier = 0
}

Definition at line 94 of file hx711.c.

Referenced by hx711_init().