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Fix hx711 (#602)

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* Fix HX711

* Use signed value

* Update hx711.cpp
This commit is contained in:
Otto Winter 2019-06-03 09:41:13 +02:00
parent 6b1b9ef7ec
commit c81e3a3be4
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GPG key ID: DB66C0BE6013F97E
1 changed files with 14 additions and 4 deletions
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18
esphome/components/hx711/hx711.cpp
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@ -1,5 +1,6 @@
#include "hx711.h"
#include "esphome/core/log.h"
#include "esphome/core/helpers.h"
namespace esphome {
namespace hx711 {
@ -10,6 +11,7 @@ void HX711Sensor::setup() {
ESP_LOGCONFIG(TAG, "Setting up HX711 '%s'...", this->name_.c_str());
this->sck_pin_->setup();
this->dout_pin_->setup();
this->sck_pin_->digital_write(false);
// Read sensor once without publishing to set the gain
this->read_sensor_(nullptr);
@ -25,8 +27,9 @@ float HX711Sensor::get_setup_priority() const { return setup_priority::DATA; }
void HX711Sensor::update() {
uint32_t result;
if (this->read_sensor_(&result)) {
ESP_LOGD(TAG, "'%s': Got value %u", this->name_.c_str(), result);
this->publish_state(result);
int32_t value = static_cast<int32_t>(result);
ESP_LOGD(TAG, "'%s': Got value %d", this->name_.c_str(), value);
this->publish_state(value);
}
}
bool HX711Sensor::read_sensor_(uint32_t *result) {
@ -39,10 +42,11 @@ bool HX711Sensor::read_sensor_(uint32_t *result) {
this->status_clear_warning();
uint32_t data = 0;
disable_interrupts();
for (uint8_t i = 0; i < 24; i++) {
this->sck_pin_->digital_write(true);
delayMicroseconds(1);
data |= uint32_t(this->dout_pin_->digital_read()) << (24 - i);
data |= uint32_t(this->dout_pin_->digital_read()) << (23 - i);
this->sck_pin_->digital_write(false);
delayMicroseconds(1);
}
@ -50,10 +54,16 @@ bool HX711Sensor::read_sensor_(uint32_t *result) {
// Cycle clock pin for gain setting
for (uint8_t i = 0; i < this->gain_; i++) {
this->sck_pin_->digital_write(true);
delayMicroseconds(1);
this->sck_pin_->digital_write(false);
delayMicroseconds(1);
}
enable_interrupts();
if (data & 0x800000ULL) {
data |= 0xFF000000ULL;
}
data ^= 0x800000;
if (result != nullptr)
*result = data;
return true;