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[uart] Allow hardware UART with single pin on RP2040 (#14725)

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This commit is contained in:
J. Nick Koston
2026-03-12 07:16:38 -10:00
committed by GitHub
parent 618312f0ee
commit 186ca4e458
2 changed files with 32 additions and 8 deletions
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37
esphome/components/uart/uart_component_rp2040.cpp
View File

@@ -105,15 +105,34 @@ void RP2040UartComponent::setup() {
}
}
// Determine which hardware UART to use. A pin that is not specified
// should not prevent hardware UART selection — one-way UART is valid.
// When both pins are configured, both must be HW-capable and agree on UART number.
// When only one pin is configured (nullptr other), use that pin's HW UART.
// If a pin is configured but not HW-capable (inverted/invalid), fall back to SerialPIO.
int8_t hw_uart = -1;
const bool tx_configured = (this->tx_pin_ != nullptr);
const bool rx_configured = (this->rx_pin_ != nullptr);
if (tx_configured && rx_configured) {
// Both pins configured — both must map to the same hardware UART
if (tx_hw != -1 && rx_hw != -1 && tx_hw == rx_hw) {
hw_uart = tx_hw;
}
} else if (tx_configured) {
hw_uart = tx_hw;
} else if (rx_configured) {
hw_uart = rx_hw;
}
#ifdef USE_LOGGER
if (tx_hw == rx_hw && logger::global_logger->get_uart() == tx_hw) {
ESP_LOGD(TAG, "Using SerialPIO as UART%d is taken by the logger", tx_hw);
tx_hw = -1;
rx_hw = -1;
if (hw_uart != -1 && logger::global_logger->get_uart() == hw_uart) {
ESP_LOGD(TAG, "Using SerialPIO as UART%d is taken by the logger", hw_uart);
hw_uart = -1;
}
#endif
if (tx_hw == -1 || rx_hw == -1 || tx_hw != rx_hw) {
if (hw_uart == -1) {
ESP_LOGV(TAG, "Using SerialPIO");
pin_size_t tx = this->tx_pin_ == nullptr ? NOPIN : this->tx_pin_->get_pin();
pin_size_t rx = this->rx_pin_ == nullptr ? NOPIN : this->rx_pin_->get_pin();
@@ -127,13 +146,15 @@ void RP2040UartComponent::setup() {
} else {
ESP_LOGV(TAG, "Using Hardware Serial");
SerialUART *serial;
if (tx_hw == 0) {
if (hw_uart == 0) {
serial = &Serial1;
} else {
serial = &Serial2;
}
serial->setTX(this->tx_pin_->get_pin());
serial->setRX(this->rx_pin_->get_pin());
if (this->tx_pin_ != nullptr)
serial->setTX(this->tx_pin_->get_pin());
if (this->rx_pin_ != nullptr)
serial->setRX(this->rx_pin_->get_pin());
serial->setFIFOSize(this->rx_buffer_size_);
serial->begin(this->baud_rate_, config);
this->serial_ = serial;

3
tests/components/uart/test.rp2040-ard.yaml
View File

@@ -23,3 +23,6 @@ uart:
baud_rate: 115200
debug:
debug_prefix: "[UART1] "
- id: uart_rx_only
rx_pin: 17
baud_rate: 1200