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arduino-esp32/cores/esp32/esp32-hal-uart.c
Rodrigo Garcia 58b9f079d2
HardwareSerial Available For Write (#9319) 
* feat(uart): setBufferSize 

It makes sure that setting TX buffer size will match availableForWrite() response. It also sets the buffer to the minimum instead of doing nothing and returning an error.

For RX Buffer, it sets the minimum and also don't return an error.

This makes the APIs better and easy to understand its results.

* feat: sets TX buffer 

This will allow to set TX buffer to a minimum with no error message.
It also makes it works as in the Arduino API specification that is to return the buffer available space. In ESP32 case it will be the minmum the HW TX FIFO size of 128 bytes.

* feat: adjust availableForWrite

This change will make sure that if no TX Ringbuffer is used, it will return the UART FIFO available space. Otherwise, it will return the Ringbuffer available space, as defined in the Arduino especification.
2024-03-05 10:53:14 +02:00

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// Copyright 2015-2024 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "esp32-hal-uart.h"
#if SOC_UART_SUPPORTED
#include "esp32-hal.h"
#include "esp32-hal-periman.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "driver/uart.h"
#include "hal/uart_ll.h"
#include "soc/soc_caps.h"
#include "soc/uart_struct.h"
#include "soc/uart_periph.h"
#include "rom/ets_sys.h"
#include "rom/gpio.h"
#include "driver/gpio.h"
#include "hal/gpio_hal.h"
#include "esp_rom_gpio.h"
static int s_uart_debug_nr = 0; // UART number for debug output
struct uart_struct_t {
#if !CONFIG_DISABLE_HAL_LOCKS
SemaphoreHandle_t lock; // UART lock
#endif
uint8_t num; // UART number for IDF driver API
bool has_peek; // flag to indicate that there is a peek byte pending to be read
uint8_t peek_byte; // peek byte that has been read but not consumed
QueueHandle_t uart_event_queue; // export it by some uartGetEventQueue() function
// configuration data:: Arduino API tipical data
int8_t _rxPin, _txPin, _ctsPin, _rtsPin; // UART GPIOs
uint32_t _baudrate, _config; // UART baudrate and config
// UART ESP32 specific data
uint16_t _rx_buffer_size, _tx_buffer_size; // UART RX and TX buffer sizes
bool _inverted; // UART inverted signal
uint8_t _rxfifo_full_thrhd; // UART RX FIFO full threshold
};
#if CONFIG_DISABLE_HAL_LOCKS
#define UART_MUTEX_LOCK()
#define UART_MUTEX_UNLOCK()
static uart_t _uart_bus_array[] = {
{0, false, 0, NULL, -1, -1, -1, -1, 0, 0, 0, 0, false, 0},
#if SOC_UART_NUM > 1
{1, false, 0, NULL, -1, -1, -1, -1, 0, 0, 0, 0, false, 0},
#endif
#if SOC_UART_NUM > 2
{2, false, 0, NULL, -1, -1, -1, -1, 0, 0, 0, 0, false, 0},
#endif
};
#else
#define UART_MUTEX_LOCK() if(uart->lock != NULL) do {} while (xSemaphoreTake(uart->lock, portMAX_DELAY) != pdPASS)
#define UART_MUTEX_UNLOCK() if(uart->lock != NULL) xSemaphoreGive(uart->lock)
static uart_t _uart_bus_array[] = {
{NULL, 0, false, 0, NULL, -1, -1, -1, -1, 0, 0, 0, 0, false, 0},
#if SOC_UART_NUM > 1
{NULL, 1, false, 0, NULL, -1, -1, -1, -1, 0, 0, 0, 0, false, 0},
#endif
#if SOC_UART_NUM > 2
{NULL, 2, false, 0, NULL, -1, -1, -1, -1, 0, 0, 0, 0, false, 0},
#endif
};
#endif
// Negative Pin Number will keep it unmodified, thus this function can detach individual pins
// This function will also unset the pins in the Peripheral Manager and set the pin to -1 after detaching
static bool _uartDetachPins(uint8_t uart_num, int8_t rxPin, int8_t txPin, int8_t ctsPin, int8_t rtsPin)
{
if(uart_num >= SOC_UART_NUM) {
log_e("Serial number is invalid, please use number from 0 to %u", SOC_UART_NUM - 1);
return false;
}
// get UART information
uart_t* uart = &_uart_bus_array[uart_num];
bool retCode = true;
//log_v("detaching UART%d pins: prev,pin RX(%d,%d) TX(%d,%d) CTS(%d,%d) RTS(%d,%d)", uart_num,
// uart->_rxPin, rxPin, uart->_txPin, txPin, uart->_ctsPin, ctsPin, uart->_rtsPin, rtsPin); vTaskDelay(10);
// detaches pins and sets Peripheral Manager and UART information
if (rxPin >= 0 && uart->_rxPin == rxPin && perimanGetPinBusType(rxPin) == ESP32_BUS_TYPE_UART_RX) {
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[rxPin], PIN_FUNC_GPIO);
// avoids causing BREAK in the UART line
if (uart->_inverted) {
esp_rom_gpio_connect_in_signal(GPIO_FUNC_IN_LOW, UART_PERIPH_SIGNAL(uart_num, SOC_UART_RX_PIN_IDX), false);
} else {
esp_rom_gpio_connect_in_signal(GPIO_FUNC_IN_HIGH, UART_PERIPH_SIGNAL(uart_num, SOC_UART_RX_PIN_IDX), false);
}
uart->_rxPin = -1; // -1 means unassigned/detached
if (!perimanClearPinBus(rxPin)) {
retCode = false;
log_e("UART%d failed to detach RX pin %d", uart_num, rxPin);
}
}
if (txPin >= 0 && uart->_txPin == txPin && perimanGetPinBusType(txPin) == ESP32_BUS_TYPE_UART_TX) {
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[txPin], PIN_FUNC_GPIO);
esp_rom_gpio_connect_out_signal(txPin, SIG_GPIO_OUT_IDX, false, false);
uart->_txPin = -1; // -1 means unassigned/detached
if (!perimanClearPinBus(txPin)) {
retCode = false;
log_e("UART%d failed to detach TX pin %d", uart_num, txPin);
}
}
if (ctsPin >= 0 && uart->_ctsPin == ctsPin && perimanGetPinBusType(ctsPin) == ESP32_BUS_TYPE_UART_CTS) {
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[ctsPin], PIN_FUNC_GPIO);
esp_rom_gpio_connect_in_signal(GPIO_FUNC_IN_LOW, UART_PERIPH_SIGNAL(uart_num, SOC_UART_CTS_PIN_IDX), false);
uart->_ctsPin = -1; // -1 means unassigned/detached
if (!perimanClearPinBus(ctsPin)) {
retCode = false;
log_e("UART%d failed to detach CTS pin %d", uart_num, ctsPin);
}
}
if (rtsPin >= 0 && uart->_rtsPin == rtsPin && perimanGetPinBusType(rtsPin) == ESP32_BUS_TYPE_UART_RTS) {
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[rtsPin], PIN_FUNC_GPIO);
esp_rom_gpio_connect_out_signal(rtsPin, SIG_GPIO_OUT_IDX, false, false);
uart->_rtsPin = -1; // -1 means unassigned/detached
if (!perimanClearPinBus(rtsPin)) {
retCode = false;
log_e("UART%d failed to detach RTS pin %d", uart_num, rtsPin);
}
}
return retCode;
}
// Peripheral Manager detach callback for each specific UART PIN
static bool _uartDetachBus_RX(void *busptr)
{
// sanity check - it should never happen
assert(busptr && "_uartDetachBus_RX bus NULL pointer.");
uart_t* bus = (uart_t*) busptr;
return _uartDetachPins(bus->num, bus->_rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
}
static bool _uartDetachBus_TX(void *busptr)
{
// sanity check - it should never happen
assert(busptr && "_uartDetachBus_TX bus NULL pointer.");
uart_t* bus = (uart_t*) busptr;
return _uartDetachPins(bus->num, UART_PIN_NO_CHANGE, bus->_txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
}
static bool _uartDetachBus_CTS(void *busptr)
{
// sanity check - it should never happen
assert(busptr && "_uartDetachBus_CTS bus NULL pointer.");
uart_t* bus = (uart_t*) busptr;
return _uartDetachPins(bus->num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, bus->_ctsPin, UART_PIN_NO_CHANGE);
}
static bool _uartDetachBus_RTS(void *busptr)
{
// sanity check - it should never happen
assert(busptr && "_uartDetachBus_RTS bus NULL pointer.");
uart_t* bus = (uart_t*) busptr;
return _uartDetachPins(bus->num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, bus->_rtsPin);
}
// Attach function for UART
// connects the IO Pad, set Paripheral Manager and internal UART structure data
static bool _uartAttachPins(uint8_t uart_num, int8_t rxPin, int8_t txPin, int8_t ctsPin, int8_t rtsPin)
{
if(uart_num >= SOC_UART_NUM) {
log_e("Serial number is invalid, please use number from 0 to %u", SOC_UART_NUM - 1);
return false;
}
// get UART information
uart_t* uart = &_uart_bus_array[uart_num];
//log_v("attaching UART%d pins: prev,new RX(%d,%d) TX(%d,%d) CTS(%d,%d) RTS(%d,%d)", uart_num,
// uart->_rxPin, rxPin, uart->_txPin, txPin, uart->_ctsPin, ctsPin, uart->_rtsPin, rtsPin); vTaskDelay(10);
bool retCode = true;
if (rxPin >= 0) {
// forces a clean detaching from a previous peripheral
if (perimanGetPinBusType(rxPin) != ESP32_BUS_TYPE_INIT) perimanClearPinBus(rxPin);
// connect RX Pad
bool ret = ESP_OK == uart_set_pin(uart->num, UART_PIN_NO_CHANGE, rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
if (ret) {
ret &= perimanSetPinBus(rxPin, ESP32_BUS_TYPE_UART_RX, (void *)uart, uart_num, -1);
if (ret) uart->_rxPin = rxPin;
}
if (!ret) {
log_e("UART%d failed to attach RX pin %d", uart_num, rxPin);
}
retCode &= ret;
}
if (txPin >= 0) {
// forces a clean detaching from a previous peripheral
if (perimanGetPinBusType(txPin) != ESP32_BUS_TYPE_INIT) perimanClearPinBus(txPin);
// connect TX Pad
bool ret = ESP_OK == uart_set_pin(uart->num, txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
if (ret) {
ret &= perimanSetPinBus(txPin, ESP32_BUS_TYPE_UART_TX, (void *)uart, uart_num, -1);
if (ret) uart->_txPin = txPin;
}
if (!ret) {
log_e("UART%d failed to attach TX pin %d", uart_num, txPin);
}
retCode &= ret;
}
if (ctsPin >= 0) {
// forces a clean detaching from a previous peripheral
if (perimanGetPinBusType(ctsPin) != ESP32_BUS_TYPE_INIT) perimanClearPinBus(ctsPin);
// connect CTS Pad
bool ret = ESP_OK == uart_set_pin(uart->num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, ctsPin);
if (ret) {
ret &= perimanSetPinBus(ctsPin, ESP32_BUS_TYPE_UART_CTS, (void *)uart, uart_num, -1);
if (ret) uart->_ctsPin = ctsPin;
}
if (!ret) {
log_e("UART%d failed to attach CTS pin %d", uart_num, ctsPin);
}
retCode &= ret;
}
if (rtsPin >= 0) {
// forces a clean detaching from a previous peripheral
if (perimanGetPinBusType(rtsPin) != ESP32_BUS_TYPE_INIT) perimanClearPinBus(rtsPin);
// connect RTS Pad
bool ret = ESP_OK == uart_set_pin(uart->num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, rtsPin, UART_PIN_NO_CHANGE);
if (ret) {
ret &= perimanSetPinBus(rtsPin, ESP32_BUS_TYPE_UART_RTS, (void *)uart, uart_num, -1);
if (ret) uart->_rtsPin = rtsPin;
}
if (!ret) {
log_e("UART%d failed to attach RTS pin %d", uart_num, rtsPin);
}
retCode &= ret;
}
return retCode;
}
// just helper functions
int8_t uart_get_RxPin(uint8_t uart_num)
{
return _uart_bus_array[uart_num]._rxPin;
}
int8_t uart_get_TxPin(uint8_t uart_num)
{
return _uart_bus_array[uart_num]._txPin;
}
void uart_init_PeriMan(void)
{
// set Peripheral Manager deInit Callback for each UART pin
perimanSetBusDeinit(ESP32_BUS_TYPE_UART_RX, _uartDetachBus_RX);
perimanSetBusDeinit(ESP32_BUS_TYPE_UART_TX, _uartDetachBus_TX);
perimanSetBusDeinit(ESP32_BUS_TYPE_UART_CTS, _uartDetachBus_CTS);
perimanSetBusDeinit(ESP32_BUS_TYPE_UART_RTS, _uartDetachBus_RTS);
}
// Routines that take care of UART events will be in the HardwareSerial Class code
void uartGetEventQueue(uart_t* uart, QueueHandle_t *q)
{
// passing back NULL for the Queue pointer when UART is not initialized yet
*q = NULL;
if(uart == NULL) {
return;
}
*q = uart->uart_event_queue;
return;
}
bool uartIsDriverInstalled(uart_t* uart)
{
if(uart == NULL) {
return false;
}
if (uart_is_driver_installed(uart->num)) {
return true;
}
return false;
}
// Negative Pin Number will keep it unmodified, thus this function can set individual pins
// When pins are changed, it will detach the previous one
bool uartSetPins(uint8_t uart_num, int8_t rxPin, int8_t txPin, int8_t ctsPin, int8_t rtsPin)
{
if(uart_num >= SOC_UART_NUM) {
log_e("Serial number is invalid, please use number from 0 to %u", SOC_UART_NUM - 1);
return false;
}
// get UART information
uart_t* uart = &_uart_bus_array[uart_num];
bool retCode = true;
UART_MUTEX_LOCK();
//log_v("setting UART%d pins: prev->new RX(%d->%d) TX(%d->%d) CTS(%d->%d) RTS(%d->%d)", uart_num,
// uart->_rxPin, rxPin, uart->_txPin, txPin, uart->_ctsPin, ctsPin, uart->_rtsPin, rtsPin); vTaskDelay(10);
// First step: detachs all previous UART pins
bool rxPinChanged = rxPin >= 0 && rxPin != uart->_rxPin;
if (rxPinChanged) {
retCode &= _uartDetachPins(uart_num, uart->_rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
}
bool txPinChanged = txPin >= 0 && txPin != uart->_txPin;
if (txPinChanged) {
retCode &= _uartDetachPins(uart_num, UART_PIN_NO_CHANGE, uart->_txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
}
bool ctsPinChanged = ctsPin >= 0 && ctsPin != uart->_ctsPin;
if (ctsPinChanged) {
retCode &= _uartDetachPins(uart_num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, uart->_ctsPin, UART_PIN_NO_CHANGE);
}
bool rtsPinChanged = rtsPin >= 0 && rtsPin != uart->_rtsPin;
if (rtsPinChanged) {
retCode &= _uartDetachPins(uart_num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, uart->_rtsPin);
}
// Second step: attach all UART new pins
if (rxPinChanged) {
retCode &= _uartAttachPins(uart_num, rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
}
if (txPinChanged) {
retCode &= _uartAttachPins(uart_num, UART_PIN_NO_CHANGE, txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
}
if (ctsPinChanged) {
retCode &= _uartAttachPins(uart->num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, ctsPin, UART_PIN_NO_CHANGE);
}
if (rtsPinChanged) {
retCode &= _uartAttachPins(uart->num, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, rtsPin);
}
UART_MUTEX_UNLOCK();
if (!retCode) {
log_e("UART%d set pins failed.", uart_num);
}
return retCode;
}
//
bool uartSetHwFlowCtrlMode(uart_t *uart, uart_hw_flowcontrol_t mode, uint8_t threshold) {
if(uart == NULL) {
return false;
}
// IDF will issue corresponding error message when mode or threshold are wrong and prevent crashing
// IDF will check (mode > HW_FLOWCTRL_CTS_RTS || threshold >= SOC_UART_FIFO_LEN)
UART_MUTEX_LOCK();
bool retCode = (ESP_OK == uart_set_hw_flow_ctrl(uart->num, mode, threshold));
UART_MUTEX_UNLOCK();
return retCode;
}
// This helper function will return true if a new IDF UART driver needs to be restarted and false if the current one can continue its execution
bool _testUartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rxPin, int8_t txPin, uint16_t rx_buffer_size, uint16_t tx_buffer_size, bool inverted, uint8_t rxfifo_full_thrhd)
{
if(uart_nr >= SOC_UART_NUM) {
return false; // no new driver has to be installed
}
uart_t* uart = &_uart_bus_array[uart_nr];
// verify if is necessary to restart the UART driver
if (uart_is_driver_installed(uart_nr)) {
// some parameters can't be changed unless we end the UART driver
if ( uart->_rx_buffer_size != rx_buffer_size || uart->_tx_buffer_size != tx_buffer_size || uart->_inverted != inverted || uart->_rxfifo_full_thrhd != rxfifo_full_thrhd) {
return true; // the current IDF UART driver must be terminated and a new driver shall be installed
} else {
return false; // The current IDF UART driver can continue its execution
}
} else {
return true; // no IDF UART driver is running and a new driver shall be installed
}
}
uart_t* uartBegin(uint8_t uart_nr, uint32_t baudrate, uint32_t config, int8_t rxPin, int8_t txPin, uint16_t rx_buffer_size, uint16_t tx_buffer_size, bool inverted, uint8_t rxfifo_full_thrhd)
{
if(uart_nr >= SOC_UART_NUM) {
log_e("UART number is invalid, please use number from 0 to %u", SOC_UART_NUM - 1);
return NULL; // no new driver was installed
}
uart_t* uart = &_uart_bus_array[uart_nr];
log_v("UART%d baud(%ld) Mode(%x) rxPin(%d) txPin(%d)", uart_nr, baudrate, config, rxPin, txPin);
#if !CONFIG_DISABLE_HAL_LOCKS
if(uart->lock == NULL) {
uart->lock = xSemaphoreCreateMutex();
if(uart->lock == NULL) {
log_e("HAL LOCK error.");
return NULL; // no new driver was installed
}
}
#endif
if (uart_is_driver_installed(uart_nr)) {
log_v("UART%d Driver already installed.", uart_nr);
// some parameters can't be changed unless we end the UART driver
if ( uart->_rx_buffer_size != rx_buffer_size || uart->_tx_buffer_size != tx_buffer_size || uart->_inverted != inverted || uart->_rxfifo_full_thrhd != rxfifo_full_thrhd) {
log_v("UART%d changing buffer sizes or inverted signal or rxfifo_full_thrhd. IDF driver will be restarted", uart_nr);
uartEnd(uart_nr);
} else {
bool retCode = true;
UART_MUTEX_LOCK();
//User may just want to change some parameters, such as baudrate, data length, parity, stop bits or pins
if (uart->_baudrate != baudrate) {
if (ESP_OK != uart_set_baudrate(uart_nr, baudrate)) {
log_e("UART%d changing baudrate failed.", uart_nr);
retCode = false;
} else {
log_v("UART%d changed baudrate to %d", uart_nr, baudrate);
uart->_baudrate = baudrate;
}
}
uart_word_length_t data_bits = (config & 0xc) >> 2;
uart_parity_t parity = config & 0x3;
uart_stop_bits_t stop_bits = (config & 0x30) >> 4;
if (retCode && (uart->_config & 0xc) >> 2 != data_bits) {
if (ESP_OK != uart_set_word_length(uart_nr, data_bits)) {
log_e("UART%d changing data length failed.", uart_nr);
retCode = false;
} else {
log_v("UART%d changed data length to %d", uart_nr, data_bits + 5);
}
}
if (retCode && (uart->_config & 0x3) != parity) {
if (ESP_OK != uart_set_parity(uart_nr, parity)) {
log_e("UART%d changing parity failed.", uart_nr);
retCode = false;
} else {
log_v("UART%d changed parity to %s", uart_nr, parity == 0 ? "NONE" : parity == 2 ? "EVEN" : "ODD");
}
}
if (retCode && (uart->_config & 0xc30) >> 4 != stop_bits) {
if (ESP_OK != uart_set_stop_bits(uart_nr, stop_bits)) {
log_e("UART%d changing stop bits failed.", uart_nr);
retCode = false;
} else {
log_v("UART%d changed stop bits to %d", uart_nr, stop_bits == 3 ? 2 : 1);
}
}
if (retCode) uart->_config = config;
if (retCode && rxPin > 0 && uart->_rxPin != rxPin) {
retCode &= _uartDetachPins(uart_nr, uart->_rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
retCode &= _uartAttachPins(uart_nr, rxPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
if (!retCode) {
log_e("UART%d changing RX pin failed.", uart_nr);
} else {
log_v("UART%d changed RX pin to %d", uart_nr, rxPin);
}
}
if (retCode && txPin > 0 && uart->_txPin != txPin) {
retCode &= _uartDetachPins(uart_nr, UART_PIN_NO_CHANGE, uart->_txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
retCode &= _uartAttachPins(uart_nr, UART_PIN_NO_CHANGE, txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
if (!retCode) {
log_e("UART%d changing TX pin failed.", uart_nr);
} else {
log_v("UART%d changed TX pin to %d", uart_nr, txPin);
}
}
UART_MUTEX_UNLOCK();
if (retCode) {
// UART driver was already working, just return the uart_t structure, syaing that no new driver was installed
return uart;
}
// if we reach this point, it means that we need to restart the UART driver
uartEnd(uart_nr);
}
} else {
log_v("UART%d not installed. Starting installation", uart_nr);
}
uart_config_t uart_config;
uart_config.data_bits = (config & 0xc) >> 2;
uart_config.parity = (config & 0x3);
uart_config.stop_bits = (config & 0x30) >> 4;
uart_config.flow_ctrl = UART_HW_FLOWCTRL_DISABLE;
uart_config.rx_flow_ctrl_thresh = rxfifo_full_thrhd;
uart_config.baud_rate = baudrate;
// CLK_APB for ESP32|S2|S3|C3 -- CLK_PLL_F40M for C2 -- CLK_PLL_F48M for H2 -- CLK_PLL_F80M for C6
uart_config.source_clk = UART_SCLK_DEFAULT;
UART_MUTEX_LOCK();
bool retCode = ESP_OK == uart_driver_install(uart_nr, rx_buffer_size, tx_buffer_size, 20, &(uart->uart_event_queue), 0);
if (retCode) retCode &= ESP_OK == uart_param_config(uart_nr, &uart_config);
// Is it right or the idea is to swap rx and tx pins?
if (retCode && inverted) {
// invert signal for both Rx and Tx
retCode &= ESP_OK == uart_set_line_inverse(uart_nr, UART_SIGNAL_TXD_INV | UART_SIGNAL_RXD_INV);
}
if (retCode) {
uart->_baudrate = baudrate;
uart->_config = config;
uart->_inverted = inverted;
uart->_rxfifo_full_thrhd = rxfifo_full_thrhd;
uart->_rx_buffer_size = rx_buffer_size;
uart->_tx_buffer_size = tx_buffer_size;
uart->_ctsPin = -1;
uart->_rtsPin = -1;
uart->has_peek = false;
uart->peek_byte = 0;
}
UART_MUTEX_UNLOCK();
// uartSetPins detaches previous pins if new ones are used over a previous begin()
if (retCode) retCode &= uartSetPins(uart_nr, rxPin, txPin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
if (!retCode) {
uartEnd(uart_nr);
uart = NULL;
log_e("UART%d initialization error.", uart->num);
} else {
uartFlush(uart);
log_v("UART%d initialization done.", uart->num);
}
return uart; // a new driver was installed
}
// This function code is under testing - for now just keep it here
void uartSetFastReading(uart_t* uart)
{
if(uart == NULL) {
return;
}
UART_MUTEX_LOCK();
// override default RX IDF Driver Interrupt - no BREAK, PARITY or OVERFLOW
uart_intr_config_t uart_intr = {
.intr_enable_mask = UART_INTR_RXFIFO_FULL | UART_INTR_RXFIFO_TOUT, // only these IRQs - no BREAK, PARITY or OVERFLOW
.rx_timeout_thresh = 1,
.txfifo_empty_intr_thresh = 10,
.rxfifo_full_thresh = 2,
};
ESP_ERROR_CHECK(uart_intr_config(uart->num, &uart_intr));
UART_MUTEX_UNLOCK();
}
bool uartSetRxTimeout(uart_t* uart, uint8_t numSymbTimeout)
{
if(uart == NULL) {
return false;
}
UART_MUTEX_LOCK();
bool retCode = (ESP_OK == uart_set_rx_timeout(uart->num, numSymbTimeout));
UART_MUTEX_UNLOCK();
return retCode;
}
bool uartSetRxFIFOFull(uart_t* uart, uint8_t numBytesFIFOFull)
{
if(uart == NULL) {
return false;
}
UART_MUTEX_LOCK();
bool retCode = (ESP_OK == uart_set_rx_full_threshold(uart->num, numBytesFIFOFull));
UART_MUTEX_UNLOCK();
return retCode;
}
void uartEnd(uint8_t uart_num)
{
if(uart_num >= SOC_UART_NUM) {
log_e("Serial number is invalid, please use number from 0 to %u", SOC_UART_NUM - 1);
return;
}
// get UART information
uart_t* uart = &_uart_bus_array[uart_num];
UART_MUTEX_LOCK();
_uartDetachPins(uart_num, uart->_rxPin, uart->_txPin, uart->_ctsPin, uart->_rtsPin);
if(uart_is_driver_installed(uart_num)) {
uart_driver_delete(uart_num);
}
UART_MUTEX_UNLOCK();
}
void uartSetRxInvert(uart_t* uart, bool invert)
{
if (uart == NULL)
return;
#if CONFIG_IDF_TARGET_ESP32C6 || CONFIG_IDF_TARGET_ESP32H2
// POTENTIAL ISSUE :: original code only set/reset rxd_inv bit
// IDF or LL set/reset the whole inv_mask!
// if (invert)
// ESP_ERROR_CHECK(uart_set_line_inverse(uart->num, UART_SIGNAL_RXD_INV));
// else
// ESP_ERROR_CHECK(uart_set_line_inverse(uart->num, UART_SIGNAL_INV_DISABLE));
#else
// this implementation is better over IDF API because it only affects RXD
// this is supported in ESP32, ESP32-S2 and ESP32-C3
uart_dev_t *hw = UART_LL_GET_HW(uart->num);
if (invert)
hw->conf0.rxd_inv = 1;
else
hw->conf0.rxd_inv = 0;
#endif
}
uint32_t uartAvailable(uart_t* uart)
{
if(uart == NULL) {
return 0;
}
UART_MUTEX_LOCK();
size_t available;
uart_get_buffered_data_len(uart->num, &available);
if (uart->has_peek) available++;
UART_MUTEX_UNLOCK();
return available;
}
uint32_t uartAvailableForWrite(uart_t* uart)
{
if(uart == NULL) {
return 0;
}
UART_MUTEX_LOCK();
uint32_t available = uart_ll_get_txfifo_len(UART_LL_GET_HW(uart->num));
size_t txRingBufferAvailable = 0;
if (ESP_OK == uart_get_tx_buffer_free_size(uart->num, &txRingBufferAvailable)) {
available = txRingBufferAvailable == 0 ? available : txRingBufferAvailable;
}
UART_MUTEX_UNLOCK();
return available;
}
size_t uartReadBytes(uart_t* uart, uint8_t *buffer, size_t size, uint32_t timeout_ms)
{
if(uart == NULL || size == 0 || buffer == NULL) {
return 0;
}
size_t bytes_read = 0;
UART_MUTEX_LOCK();
if (uart->has_peek) {
uart->has_peek = false;
*buffer++ = uart->peek_byte;
size--;
bytes_read = 1;
}
if (size > 0) {
int len = uart_read_bytes(uart->num, buffer, size, pdMS_TO_TICKS(timeout_ms));
if (len < 0) len = 0; // error reading UART
bytes_read += len;
}
UART_MUTEX_UNLOCK();
return bytes_read;
}
// DEPRICATED but the original code will be kepts here as future reference when a final solution
// to the UART driver is defined in the use case of reading byte by byte from UART.
uint8_t uartRead(uart_t* uart)
{
if(uart == NULL) {
return 0;
}
uint8_t c = 0;
UART_MUTEX_LOCK();
if (uart->has_peek) {
uart->has_peek = false;
c = uart->peek_byte;
} else {
int len = uart_read_bytes(uart->num, &c, 1, 20 / portTICK_PERIOD_MS);
if (len <= 0) { // includes negative return from IDF in case of error
c = 0;
}
}
UART_MUTEX_UNLOCK();
return c;
}
uint8_t uartPeek(uart_t* uart)
{
if(uart == NULL) {
return 0;
}
uint8_t c = 0;
UART_MUTEX_LOCK();
if (uart->has_peek) {
c = uart->peek_byte;
} else {
int len = uart_read_bytes(uart->num, &c, 1, 20 / portTICK_PERIOD_MS);
if (len <= 0) { // includes negative return from IDF in case of error
c = 0;
} else {
uart->has_peek = true;
uart->peek_byte = c;
}
}
UART_MUTEX_UNLOCK();
return c;
}
void uartWrite(uart_t* uart, uint8_t c)
{
if(uart == NULL) {
return;
}
UART_MUTEX_LOCK();
uart_write_bytes(uart->num, &c, 1);
UART_MUTEX_UNLOCK();
}
void uartWriteBuf(uart_t* uart, const uint8_t * data, size_t len)
{
if(uart == NULL || data == NULL || !len) {
return;
}
UART_MUTEX_LOCK();
uart_write_bytes(uart->num, data, len);
UART_MUTEX_UNLOCK();
}
void uartFlush(uart_t* uart)
{
uartFlushTxOnly(uart, true);
}
void uartFlushTxOnly(uart_t* uart, bool txOnly)
{
if(uart == NULL) {
return;
}
UART_MUTEX_LOCK();
while(!uart_ll_is_tx_idle(UART_LL_GET_HW(uart->num)));
if ( !txOnly ) {
ESP_ERROR_CHECK(uart_flush_input(uart->num));
}
UART_MUTEX_UNLOCK();
}
void uartSetBaudRate(uart_t* uart, uint32_t baud_rate)
{
if(uart == NULL) {
return;
}
UART_MUTEX_LOCK();
uint32_t sclk_freq;
if(uart_get_sclk_freq(UART_SCLK_DEFAULT, &sclk_freq) == ESP_OK){
uart_ll_set_baudrate(UART_LL_GET_HW(uart->num), baud_rate, sclk_freq);
}
uart->_baudrate = baud_rate;
UART_MUTEX_UNLOCK();
}
uint32_t uartGetBaudRate(uart_t* uart)
{
uint32_t baud_rate = 0;
uint32_t sclk_freq;
if(uart == NULL) {
return 0;
}
UART_MUTEX_LOCK();
if(uart_get_sclk_freq(UART_SCLK_DEFAULT, &sclk_freq) == ESP_OK){
baud_rate = uart_ll_get_baudrate(UART_LL_GET_HW(uart->num), sclk_freq);
}
UART_MUTEX_UNLOCK();
return baud_rate;
}
static void ARDUINO_ISR_ATTR uart0_write_char(char c)
{
while (uart_ll_get_txfifo_len(&UART0) == 0);
uart_ll_write_txfifo(&UART0, (const uint8_t *) &c, 1);
}
#if SOC_UART_NUM > 1
static void ARDUINO_ISR_ATTR uart1_write_char(char c)
{
while (uart_ll_get_txfifo_len(&UART1) == 0);
uart_ll_write_txfifo(&UART1, (const uint8_t *) &c, 1);
}
#endif
#if SOC_UART_NUM > 2
static void ARDUINO_ISR_ATTR uart2_write_char(char c)
{
while (uart_ll_get_txfifo_len(&UART2) == 0);
uart_ll_write_txfifo(&UART2, (const uint8_t *) &c, 1);
}
#endif
void uart_install_putc()
{
switch(s_uart_debug_nr) {
case 0:
ets_install_putc1((void (*)(char)) &uart0_write_char);
break;
#if SOC_UART_NUM > 1
case 1:
ets_install_putc1((void (*)(char)) &uart1_write_char);
break;
#endif
#if SOC_UART_NUM > 2
case 2:
ets_install_putc1((void (*)(char)) &uart2_write_char);
break;
#endif
default:
ets_install_putc1(NULL);
break;
}
}
// Routines that take care of UART mode in the HardwareSerial Class code
// used to set UART_MODE_RS485_HALF_DUPLEX auto RTS for TXD for ESP32 chips
bool uartSetMode(uart_t *uart, uart_mode_t mode)
{
if (uart == NULL || uart->num >= SOC_UART_NUM)
{
return false;
}
UART_MUTEX_LOCK();
bool retCode = (ESP_OK == uart_set_mode(uart->num, mode));
UART_MUTEX_UNLOCK();
return retCode;
}
void uartSetDebug(uart_t* uart)
{
if(uart == NULL || uart->num >= SOC_UART_NUM) {
s_uart_debug_nr = -1;
} else {
s_uart_debug_nr = uart->num;
}
uart_install_putc();
}
int uartGetDebug()
{
return s_uart_debug_nr;
}
int log_printfv(const char *format, va_list arg)
{
static char loc_buf[64];
char * temp = loc_buf;
uint32_t len;
va_list copy;
va_copy(copy, arg);
len = vsnprintf(NULL, 0, format, copy);
va_end(copy);
if(len >= sizeof(loc_buf)){
temp = (char*)malloc(len+1);
if(temp == NULL) {
return 0;
}
}
/*
// This causes dead locks with logging in specific cases and also with C++ constructors that may send logs
#if !CONFIG_DISABLE_HAL_LOCKS
if(s_uart_debug_nr != -1 && _uart_bus_array[s_uart_debug_nr].lock){
xSemaphoreTake(_uart_bus_array[s_uart_debug_nr].lock, portMAX_DELAY);
}
#endif
*/
#if CONFIG_IDF_TARGET_ESP32C3
vsnprintf(temp, len+1, format, arg);
ets_printf("%s", temp);
#else
int wlen = vsnprintf(temp, len+1, format, arg);
for (int i = 0; i < wlen; i++) {
ets_write_char_uart(temp[i]);
}
#endif
/*
// This causes dead locks with logging and also with constructors that may send logs
#if !CONFIG_DISABLE_HAL_LOCKS
if(s_uart_debug_nr != -1 && _uart_bus_array[s_uart_debug_nr].lock){
xSemaphoreGive(_uart_bus_array[s_uart_debug_nr].lock);
}
#endif
*/
if(len >= sizeof(loc_buf)){
free(temp);
}
// flushes TX - make sure that the log message is completely sent.
if(s_uart_debug_nr != -1) while(!uart_ll_is_tx_idle(UART_LL_GET_HW(s_uart_debug_nr)));
return len;
}
int log_printf(const char *format, ...)
{
int len;
va_list arg;
va_start(arg, format);
len = log_printfv(format, arg);
va_end(arg);
return len;
}
static void log_print_buf_line(const uint8_t *b, size_t len, size_t total_len){
for(size_t i = 0; i<len; i++){
log_printf("%s0x%02x,",i?" ":"", b[i]);
}
if(total_len > 16){
for(size_t i = len; i<16; i++){
log_printf(" ");
}
log_printf(" // ");
} else {
log_printf(" // ");
}
for(size_t i = 0; i<len; i++){
log_printf("%c",((b[i] >= 0x20) && (b[i] < 0x80))?b[i]:'.');
}
log_printf("\n");
}
void log_print_buf(const uint8_t *b, size_t len){
if(!len || !b){
return;
}
for(size_t i = 0; i<len; i+=16){
if(len > 16){
log_printf("/* 0x%04X */ ", i);
}
log_print_buf_line(b+i, ((len-i)<16)?(len - i):16, len);
}
}
/*
* if enough pulses are detected return the minimum high pulse duration + minimum low pulse duration divided by two.
* This equals one bit period. If flag is true the function return inmediately, otherwise it waits for enough pulses.
*/
unsigned long uartBaudrateDetect(uart_t *uart, bool flg)
{
// Baud rate detection only works for ESP32 and ESP32S2
#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2
if(uart == NULL) {
return 0;
}
uart_dev_t *hw = UART_LL_GET_HW(uart->num);
while(hw->rxd_cnt.edge_cnt < 30) { // UART_PULSE_NUM(uart_num)
if(flg) return 0;
ets_delay_us(1000);
}
UART_MUTEX_LOCK();
//log_i("lowpulse_min_cnt = %d hightpulse_min_cnt = %d", hw->lowpulse.min_cnt, hw->highpulse.min_cnt);
unsigned long ret = ((hw->lowpulse.min_cnt + hw->highpulse.min_cnt) >> 1);
UART_MUTEX_UNLOCK();
return ret;
#else
return 0;
#endif
}
/*
* To start detection of baud rate with the uart the auto_baud.en bit needs to be cleared and set. The bit period is
* detected calling uartBadrateDetect(). The raw baudrate is computed using the UART_CLK_FREQ. The raw baudrate is
* rounded to the closed real baudrate.
*
* ESP32-C3 reports wrong baud rate detection as shown below:
*
* This will help in a future recall for the C3.
* Baud Sent: Baud Read:
* 300 --> 19536
* 2400 --> 19536
* 4800 --> 19536
* 9600 --> 28818
* 19200 --> 57678
* 38400 --> 115440
* 57600 --> 173535
* 115200 --> 347826
* 230400 --> 701754
*
*
*/
void uartStartDetectBaudrate(uart_t *uart) {
if(uart == NULL) {
return;
}
// Baud rate detection only works for ESP32 and ESP32S2
#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2
uart_dev_t *hw = UART_LL_GET_HW(uart->num);
hw->auto_baud.glitch_filt = 0x08;
hw->auto_baud.en = 0;
hw->auto_baud.en = 1;
#else
// ESP32-C3 requires further testing
// Baud rate detection returns wrong values
log_e("baud rate detection for this SoC is not supported.");
return;
// Code bellow for C3 kept for future recall
//hw->rx_filt.glitch_filt = 0x08;
//hw->rx_filt.glitch_filt_en = 1;
//hw->conf0.autobaud_en = 0;
//hw->conf0.autobaud_en = 1;
#endif
}
unsigned long uartDetectBaudrate(uart_t *uart)
{
if(uart == NULL) {
return 0;
}
// Baud rate detection only works for ESP32 and ESP32S2
#if CONFIG_IDF_TARGET_ESP32 || CONFIG_IDF_TARGET_ESP32S2
static bool uartStateDetectingBaudrate = false;
if(!uartStateDetectingBaudrate) {
uartStartDetectBaudrate(uart);
uartStateDetectingBaudrate = true;
}
unsigned long divisor = uartBaudrateDetect(uart, true);
if (!divisor) {
return 0;
}
uart_dev_t *hw = UART_LL_GET_HW(uart->num);
hw->auto_baud.en = 0;
uartStateDetectingBaudrate = false; // Initialize for the next round
unsigned long baudrate = getApbFrequency() / divisor;
//log_i("APB_FREQ = %d\nraw baudrate detected = %d", getApbFrequency(), baudrate);
static const unsigned long default_rates[] = {300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 74880, 115200, 230400, 256000, 460800, 921600, 1843200, 3686400};
size_t i;
for (i = 1; i < sizeof(default_rates) / sizeof(default_rates[0]) - 1; i++) // find the nearest real baudrate
{
if (baudrate <= default_rates[i])
{
if (baudrate - default_rates[i - 1] < default_rates[i] - baudrate) {
i--;
}
break;
}
}
return default_rates[i];
#else
log_e("baud rate detection this SoC is not supported.");
return 0;
#endif
}
/*
These functions are for testing purpose only and can be used in Arduino Sketches
Those are used in the UART examples
*/
/*
This is intended to make an internal loopback connection using IOMUX
The function uart_internal_loopback() shall be used right after Arduino Serial.begin(...)
This code "replaces" the physical wiring for connecting TX <--> RX in a loopback
*/
// gets the right TX or RX SIGNAL, based on the UART number from gpio_sig_map.h
#if SOC_UART_NUM > 2
#define UART_TX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0TXD_OUT_IDX : (uartNumber == UART_NUM_1 ? U1TXD_OUT_IDX : U2TXD_OUT_IDX))
#define UART_RX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0RXD_IN_IDX : (uartNumber == UART_NUM_1 ? U1RXD_IN_IDX : U2RXD_IN_IDX))
#else
#define UART_TX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0TXD_OUT_IDX : U1TXD_OUT_IDX)
#define UART_RX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0RXD_IN_IDX : U1RXD_IN_IDX)
#endif
/*
This function internally binds defined UARTs TX signal with defined RX pin of any UART (same or different).
This creates a loop that lets us receive anything we send on the UART without external wires.
*/
void uart_internal_loopback(uint8_t uartNum, int8_t rxPin)
{
if (uartNum > SOC_UART_NUM - 1 || !GPIO_IS_VALID_GPIO(rxPin)) return;
esp_rom_gpio_connect_out_signal(rxPin, UART_TX_SIGNAL(uartNum), false, false);
}
/*
This is intended to generate BREAK in an UART line
*/
// Forces a BREAK in the line based on SERIAL_8N1 configuration at any baud rate
void uart_send_break(uint8_t uartNum)
{
uint32_t currentBaudrate = 0;
uart_get_baudrate(uartNum, &currentBaudrate);
// calculates 10 bits of breaks in microseconds for baudrates up to 500mbps
// This is very sensetive timing... it works fine for SERIAL_8N1
uint32_t breakTime = (uint32_t) (10.0 * (1000000.0 / currentBaudrate));
uart_set_line_inverse(uartNum, UART_SIGNAL_TXD_INV);
esp_rom_delay_us(breakTime);
uart_set_line_inverse(uartNum, UART_SIGNAL_INV_DISABLE);
}
// Sends a buffer and at the end of the stream, it generates BREAK in the line
int uart_send_msg_with_break(uint8_t uartNum, uint8_t *msg, size_t msgSize)
{
// 12 bits long BREAK for 8N1
return uart_write_bytes_with_break(uartNum, (const void *)msg, msgSize, 12);
}
#endif /* SOC_UART_SUPPORTED */
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