aboutsummaryrefslogtreecommitdiff
path: root/src/sensors/dht22.c
diff options
context:
space:
mode:
authorKarel Kočí <cynerd@email.cz>2016-06-30 17:18:49 +0200
committerKarel Kočí <cynerd@email.cz>2016-06-30 17:18:49 +0200
commit4e1ce86af16307bf7d42657db07600867c7c4bbc (patch)
tree5d0dfddea221c91545a9bd57ac7face5842291d4 /src/sensors/dht22.c
parent147cb7f0e67d1f3c3274effa5476607e24664182 (diff)
downloadavr-ioe-4e1ce86af16307bf7d42657db07600867c7c4bbc.tar.gz
avr-ioe-4e1ce86af16307bf7d42657db07600867c7c4bbc.tar.bz2
avr-ioe-4e1ce86af16307bf7d42657db07600867c7c4bbc.zip
Add some more progress and split non-core functionality to separate repo
More progress to implementation and some changes in project it self. This library will implement only drivers for features on chip but nothing else. Everything connected externally is now in separate repository.
Diffstat (limited to 'src/sensors/dht22.c')
-rw-r--r--src/sensors/dht22.c117
1 files changed, 0 insertions, 117 deletions
diff --git a/src/sensors/dht22.c b/src/sensors/dht22.c
deleted file mode 100644
index 9653ba5..0000000
--- a/src/sensors/dht22.c
+++ /dev/null
@@ -1,117 +0,0 @@
-#include <sensors/dht22.h>
-
-#ifdef CONFIG_IOE_SENSOR_DHT22
-
-#define PP dht22_ports[pi]
-#define PPP dht22_ports[dht22_measurement.pi]
-
-#define TIMEOUT F_CPU/40000
-
-#define STATUS_NONE 0
-#define STATUS_COMPLETE 1
-#define STATUS_TIMEOUT 2
-
-#define PORT_SENSORW 4
-#define PORT_SENSORRESP_L 3
-#define PORT_SENSORRESP_H 2
-#define PORT_H 1
-#define PORT_L 0
-
-struct {
- uint8_t index;
- uint8_t data[5];
- volatile uint8_t status;
- uint8_t pi;
- uint8_t port_status;
-} dht22_measurement;
-
-inline void dht22_init(uint8_t pi) {
- // Set port as output and set level hight
- *(PP.DDR) |= PP.MASK;
- *(PP.PORT) |= PP.MASK;
- // Enable all pin change interrupts
- PCIFR = 0xff;
-}
-
-
-inline void dht22_read_deac(uint8_t status) {
- dht22_measurement.status = status;
- // Disable pin change interrupt
- *(PPP.PCMSK) &= ~PPP.PCMSK_MASK;
- timer_disable(CONFIG_IOE_SENSOR_DHT22_TIMER);
-}
-
-// This is called from pcint.c
-void dht22_read_pcint(void) {
- switch (dht22_measurement.port_status) {
- case PORT_L:
- if (!(*(PPP.PIN) & PPP.MASK))
- return;
- dht22_measurement.port_status = PORT_H;
- break;
- case PORT_H:
- if (*(PPP.PIN) & PPP.MASK)
- return;
- dht22_measurement.port_status = PORT_L;
- register uint16_t val;
- val = timer_value(CONFIG_IOE_SENSOR_DHT22_TIMER);
- // TODO compare value
- if (val < 1) {
- dht22_measurement.data[dht22_measurement.index / 8]
- }
- if (++(dht22_measurement.index) == 40) {
- dht22_read_deac(STATUS_COMPLETE);
- return;
- }
- break;
- default:
- if (((*(PPP.PIN) & PPP.MASK) && dht22_measurement.port_status == 3)
- || !(*(PPP.PIN & PPP.MASK)))
- return;
- dht22_measurement.port_status--;
- }
- timer_reset(CONFIG_IOE_SENSOR_DHT22_TIMER);
-}
-
-void dht22_read_timer_overflow(void) {
- dht22_read_deac(STATUS_TIMEOUT);
-}
-
-int8_t dht22_read(uint8_t pi, struct dht22_value *rh,
- struct dht22_value *t) {
- dht22_measurement.index = 0;
- dht22_measurement.status = STATUS_NONE;
- dht22_measurement.pi = pi;
- dht22_measurement.port_status = PORT_SENSORW;
-
- // Pull port down for 500us
- *(PP.PORT) &= ~PP.MASK;
- _delay_us(500);
- // Initialize timer
- timer_init(CONFIG_IOE_SENSOR_DHT22_TIMER, TIMER_DIVIDER_64);
- timer_sethook(CONFIG_IOE_SENSOR_DHT22_TIMER,
- dht22_read_timer_overflow);
- // Set pin change interrupt
- *(PP.PCMSK) |= PP.PCMSK_MASK;
- // Set port as output and pull-up resistor
- *(PP.DDR) &= ~PP.MASK;
- *(PP.PORT) |= PP.MASK;
- // Delay till reading is done
- taskDelayTill(&(dht22_measurement.status));
-
- // Copy data
- rh->integral = dht22_measurement.data[0];
- rh->decimal = dht22_measurement.data[1];
- t->integral = dht22_measurement.data[2];
- t->decimal = dht22_measurement.data[3];
- // Check sum
- uint8_t sum = dht22_measurement.data[0];
- sum += dht22_measurement.data[1];
- sum += dht22_measurement.data[2];
- sum += dht22_measurement.data[3];
- if (sum != dht22_measurement.data[4])
- return 1;
- return dht22_measurement.status - 1;
-}
-
-#endif /* CONFIG_IOE_SENSOR_SHT22 */