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uart: add drain() API

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it would allow to empty RX buffer when necessary

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
This commit is contained in:
Igor Mammedov 2019-05-23 18:45:06 +02:00 committed by nur
parent a783637a7a
commit 6bdd0e7f6d
2 changed files with 34 additions and 0 deletions
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29
esphome/components/uart/uart.cpp
View File

@ -98,6 +98,14 @@ void UARTComponent::flush() {
ESP_LOGVV(TAG, " Flushing...");
this->hw_serial_->flush();
}
void UARTComponent::drain() {
for (int i = 0; this->available(); i++) {
uint8_t junk;
this->read_byte(&junk);
ESP_LOGVV(TAG, "Draining RX[%d]: %0x", i, junk);
}
}
#endif // ESP32
#ifdef ARDUINO_ARCH_ESP8266
@ -235,6 +243,19 @@ void UARTComponent::flush() {
}
}
void UARTComponent::drain() {
if (this->hw_serial_ != nullptr) {
for (int i = 0; this->available(); i++) {
uint8_t junk;
this->read_byte(&junk);
ESP_LOGVV(TAG, "Draining RX[%d]: %0x", i, junk);
}
} else {
this->sw_serial_->drain();
}
}
void ESP8266SoftwareSerial::setup(int8_t tx_pin, int8_t rx_pin, uint32_t baud_rate) {
this->bit_time_ = F_CPU / baud_rate;
if (tx_pin != -1) {
@ -321,6 +342,14 @@ uint8_t ESP8266SoftwareSerial::peek_byte() {
return this->rx_buffer_[this->rx_out_pos_];
}
void ESP8266SoftwareSerial::flush() { this->rx_in_pos_ = this->rx_out_pos_ = 0; }
void ESP8266SoftwareSerial::drain() {
for (int i = 0; this->available(); i++) {
uint8_t junk = this->read_byte();
ESP_LOGVV(TAG, "Draining RX[%d]: %0x", i, junk);
}
}
int ESP8266SoftwareSerial::available() {
int avail = int(this->rx_in_pos_) - int(this->rx_out_pos_);
if (avail < 0)

5
esphome/components/uart/uart.h
View File

@ -16,6 +16,7 @@ class ESP8266SoftwareSerial {
uint8_t peek_byte();
void flush();
void drain();
void write_byte(uint8_t data);
@ -63,6 +64,8 @@ class UARTComponent : public Component, public Stream {
void flush() override;
void drain();
float get_setup_priority() const override { return setup_priority::BUS; }
size_t write(uint8_t data) override;
@ -111,6 +114,8 @@ class UARTDevice : public Stream {
void flush() override { return this->parent_->flush(); }
void drain() { return this->parent_->drain(); }
size_t write(uint8_t data) override { return this->parent_->write(data); }
int read() override { return this->parent_->read(); }
int peek() override { return this->parent_->peek(); }