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Turn off PN532 RF field when not expecting a tag (#1046)

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* Turn off PN532 RF field when not expecting a tag

Avoids interference with Wifi connectivity of nearby devices.

* Rename turn_off_rf_ method

* documented off command bytes

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
This commit is contained in:
Adriaan Peeters 2020-06-10 04:23:25 +02:00 committed by GitHub
parent f63fd9696f
commit bab562dc3a
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 19 additions and 1 deletions
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18
esphome/components/pn532/pn532.cpp
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@ -86,6 +86,8 @@ void PN532::setup() {
this->mark_failed();
return;
}
this->turn_off_rf_();
}
void PN532::update() {
@ -114,13 +116,16 @@ void PN532::loop() {
if (read.size() <= 2 || read[0] != 0x4B) {
// Something failed
this->turn_off_rf_();
return;
}
uint8_t num_targets = read[1];
if (num_targets != 1)
if (num_targets != 1) {
// no tags found or too many
this->turn_off_rf_();
return;
}
// const uint8_t target_number = read[2];
// const uint16_t sens_res = uint16_t(read[3] << 8) | read[4];
@ -150,6 +155,17 @@ void PN532::loop() {
format_uid(buf, nfcid, nfcid_length);
ESP_LOGD(TAG, "Found new tag '%s'", buf);
}
this->turn_off_rf_();
}
void PN532::turn_off_rf_() {
ESP_LOGVV(TAG, "Turning RF field OFF");
this->pn532_write_command_check_ack_({
0x32, // RFConfiguration
0x1, // RF Field
0x0 // Off
});
}
float PN532::get_setup_priority() const { return setup_priority::DATA; }

2
esphome/components/pn532/pn532.h
View file

@ -55,6 +55,8 @@ class PN532 : public PollingComponent,
bool read_ack_();
void turn_off_rf_();
bool requested_read_{false};
std::vector<PN532BinarySensor *> binary_sensors_;
std::vector<PN532Trigger *> triggers_;