CuVoodoo STM32F1 firmware template
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library to query measurements from Aosong DHT22 temperature and relative humidity sensor (code) More...
Go to the source code of this file.
Macros | |
#define | SENSOR_DHT22_TIMER 4 |
timer peripheral | |
#define | SENSOR_DHT22_CHANNEL 3 |
channel used as input capture | |
#define | SENSOR_DHT22_JITTER 0.2 |
signal timing jitter tolerated in timing | |
Enumerations | |
enum | sensor_dht22_state_t { SENSOR_DHT22_OFF, SENSOR_DHT22_HOST_START, SENSOR_DHT22_HOST_STARTED, SENSOR_DHT22_SLAVE_START, SENSOR_DHT22_SLAVE_BIT, SENSOR_DHT22_MAX } |
communication states | |
Functions | |
static void | sensor_dht22_reset (void) |
reset all states | |
void | sensor_dht22_setup (void) |
setup peripherals to communicate with sensor | |
bool | sensor_dht22_measurement_request (void) |
request measurement from sensor More... | |
struct sensor_dht22_measurement_t | sensor_dht22_measurement_decode (void) |
decode received measurement More... | |
void TIM_ISR() | SENSOR_DHT22_TIMER (void) |
interrupt service routine called for timer | |
Variables | |
volatile bool | sensor_dht22_measurement_received = false |
a measurement response has been received | |
enum sensor_dht22_state_t | sensor_dht22_state = SENSOR_DHT22_OFF |
current communication state | |
volatile uint8_t | sensor_dht22_bit = 0 |
the bit number being sent (MSb first), up to 40 | |
volatile uint8_t | sensor_dht22_bits [5] = {0} |
the 40 bits (5 bytes) being sent by the device | |
library to query measurements from Aosong DHT22 temperature and relative humidity sensor (code)
Definition in file sensor_dht22.c.
struct sensor_dht22_measurement_t sensor_dht22_measurement_decode | ( | void | ) |
decode received measurement
Definition at line 126 of file sensor_dht22.c.
bool sensor_dht22_measurement_request | ( | void | ) |
request measurement from sensor
Definition at line 104 of file sensor_dht22.c.