Skip to content
Permalink
Branch: master
Find file Copy path
Find file Copy path
Fetching contributors…
Cannot retrieve contributors at this time
850 lines (782 sloc) 29.9 KB
// Copyright 2015-2016 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.
#ifndef _DRIVER_UART_H_
#define _DRIVER_UART_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "soc/uart_reg.h"
#include "soc/uart_struct.h"
#include "esp_err.h"
#include "esp_intr_alloc.h"
#include "driver/periph_ctrl.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/xtensa_api.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/ringbuf.h"
#include <esp_types.h>
#include "soc/uart_channel.h"
#define UART_FIFO_LEN (128) /*!< Length of the hardware FIFO buffers */
#define UART_INTR_MASK 0x1ff /*!< Mask of all UART interrupts */
#define UART_LINE_INV_MASK (0x3f << 19) /*!< TBD */
#define UART_BITRATE_MAX 5000000 /*!< Max bit rate supported by UART */
#define UART_PIN_NO_CHANGE (-1) /*!< Constant for uart_set_pin function which indicates that UART pin should not be changed */
#define UART_INVERSE_DISABLE (0x0) /*!< Disable UART signal inverse*/
#define UART_INVERSE_RXD (UART_RXD_INV_M) /*!< UART RXD input inverse*/
#define UART_INVERSE_CTS (UART_CTS_INV_M) /*!< UART CTS input inverse*/
#define UART_INVERSE_TXD (UART_TXD_INV_M) /*!< UART TXD output inverse*/
#define UART_INVERSE_RTS (UART_RTS_INV_M) /*!< UART RTS output inverse*/
/**
* @brief UART mode selection
*/
typedef enum {
UART_MODE_UART = 0x00, /*!< mode: regular UART mode*/
UART_MODE_RS485_HALF_DUPLEX = 0x01, /*!< mode: half duplex RS485 UART mode control by RTS pin */
UART_MODE_IRDA = 0x02, /*!< mode: IRDA UART mode*/
UART_MODE_RS485_COLLISION_DETECT = 0x03, /*!< mode: RS485 collision detection UART mode (used for test purposes)*/
UART_MODE_RS485_APP_CTRL = 0x04, /*!< mode: application control RS485 UART mode (used for test purposes)*/
} uart_mode_t;
/**
* @brief UART word length constants
*/
typedef enum {
UART_DATA_5_BITS = 0x0, /*!< word length: 5bits*/
UART_DATA_6_BITS = 0x1, /*!< word length: 6bits*/
UART_DATA_7_BITS = 0x2, /*!< word length: 7bits*/
UART_DATA_8_BITS = 0x3, /*!< word length: 8bits*/
UART_DATA_BITS_MAX = 0x4,
} uart_word_length_t;
/**
* @brief UART stop bits number
*/
typedef enum {
UART_STOP_BITS_1 = 0x1, /*!< stop bit: 1bit*/
UART_STOP_BITS_1_5 = 0x2, /*!< stop bit: 1.5bits*/
UART_STOP_BITS_2 = 0x3, /*!< stop bit: 2bits*/
UART_STOP_BITS_MAX = 0x4,
} uart_stop_bits_t;
/**
* @brief UART peripheral number
*/
typedef enum {
UART_NUM_0 = 0x0, /*!< UART base address 0x3ff40000*/
UART_NUM_1 = 0x1, /*!< UART base address 0x3ff50000*/
UART_NUM_2 = 0x2, /*!< UART base address 0x3ff6e000*/
UART_NUM_MAX,
} uart_port_t;
/**
* @brief UART parity constants
*/
typedef enum {
UART_PARITY_DISABLE = 0x0, /*!< Disable UART parity*/
UART_PARITY_EVEN = 0x2, /*!< Enable UART even parity*/
UART_PARITY_ODD = 0x3 /*!< Enable UART odd parity*/
} uart_parity_t;
/**
* @brief UART hardware flow control modes
*/
typedef enum {
UART_HW_FLOWCTRL_DISABLE = 0x0, /*!< disable hardware flow control*/
UART_HW_FLOWCTRL_RTS = 0x1, /*!< enable RX hardware flow control (rts)*/
UART_HW_FLOWCTRL_CTS = 0x2, /*!< enable TX hardware flow control (cts)*/
UART_HW_FLOWCTRL_CTS_RTS = 0x3, /*!< enable hardware flow control*/
UART_HW_FLOWCTRL_MAX = 0x4,
} uart_hw_flowcontrol_t;
/**
* @brief UART configuration parameters for uart_param_config function
*/
typedef struct {
int baud_rate; /*!< UART baud rate*/
uart_word_length_t data_bits; /*!< UART byte size*/
uart_parity_t parity; /*!< UART parity mode*/
uart_stop_bits_t stop_bits; /*!< UART stop bits*/
uart_hw_flowcontrol_t flow_ctrl; /*!< UART HW flow control mode (cts/rts)*/
uint8_t rx_flow_ctrl_thresh; /*!< UART HW RTS threshold*/
bool use_ref_tick; /*!< Set to true if UART should be clocked from REF_TICK */
} uart_config_t;
/**
* @brief UART interrupt configuration parameters for uart_intr_config function
*/
typedef struct {
uint32_t intr_enable_mask; /*!< UART interrupt enable mask, choose from UART_XXXX_INT_ENA_M under UART_INT_ENA_REG(i), connect with bit-or operator*/
uint8_t rx_timeout_thresh; /*!< UART timeout interrupt threshold (unit: time of sending one byte)*/
uint8_t txfifo_empty_intr_thresh; /*!< UART TX empty interrupt threshold.*/
uint8_t rxfifo_full_thresh; /*!< UART RX full interrupt threshold.*/
} uart_intr_config_t;
/**
* @brief UART event types used in the ring buffer
*/
typedef enum {
UART_DATA, /*!< UART data event*/
UART_BREAK, /*!< UART break event*/
UART_BUFFER_FULL, /*!< UART RX buffer full event*/
UART_FIFO_OVF, /*!< UART FIFO overflow event*/
UART_FRAME_ERR, /*!< UART RX frame error event*/
UART_PARITY_ERR, /*!< UART RX parity event*/
UART_DATA_BREAK, /*!< UART TX data and break event*/
UART_PATTERN_DET, /*!< UART pattern detected */
UART_EVENT_MAX, /*!< UART event max index*/
} uart_event_type_t;
/**
* @brief Event structure used in UART event queue
*/
typedef struct {
uart_event_type_t type; /*!< UART event type */
size_t size; /*!< UART data size for UART_DATA event*/
} uart_event_t;
typedef intr_handle_t uart_isr_handle_t;
/**
* @brief Set UART data bits.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param data_bit UART data bits
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_word_length(uart_port_t uart_num, uart_word_length_t data_bit);
/**
* @brief Get UART data bits.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param data_bit Pointer to accept value of UART data bits.
*
* @return
* - ESP_FAIL Parameter error
* - ESP_OK Success, result will be put in (*data_bit)
*/
esp_err_t uart_get_word_length(uart_port_t uart_num, uart_word_length_t* data_bit);
/**
* @brief Set UART stop bits.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param stop_bits UART stop bits
*
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t uart_set_stop_bits(uart_port_t uart_num, uart_stop_bits_t stop_bits);
/**
* @brief Get UART stop bits.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param stop_bits Pointer to accept value of UART stop bits.
*
* @return
* - ESP_FAIL Parameter error
* - ESP_OK Success, result will be put in (*stop_bit)
*/
esp_err_t uart_get_stop_bits(uart_port_t uart_num, uart_stop_bits_t* stop_bits);
/**
* @brief Set UART parity mode.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param parity_mode the enum of uart parity configuration
*
* @return
* - ESP_FAIL Parameter error
* - ESP_OK Success
*/
esp_err_t uart_set_parity(uart_port_t uart_num, uart_parity_t parity_mode);
/**
* @brief Get UART parity mode.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param parity_mode Pointer to accept value of UART parity mode.
*
* @return
* - ESP_FAIL Parameter error
* - ESP_OK Success, result will be put in (*parity_mode)
*
*/
esp_err_t uart_get_parity(uart_port_t uart_num, uart_parity_t* parity_mode);
/**
* @brief Set UART baud rate.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param baudrate UART baud rate.
*
* @return
* - ESP_FAIL Parameter error
* - ESP_OK Success
*/
esp_err_t uart_set_baudrate(uart_port_t uart_num, uint32_t baudrate);
/**
* @brief Get UART baud rate.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param baudrate Pointer to accept value of UART baud rate
*
* @return
* - ESP_FAIL Parameter error
* - ESP_OK Success, result will be put in (*baudrate)
*
*/
esp_err_t uart_get_baudrate(uart_port_t uart_num, uint32_t* baudrate);
/**
* @brief Set UART line inverse mode
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param inverse_mask Choose the wires that need to be inverted.
* Inverse_mask should be chosen from
* UART_INVERSE_RXD / UART_INVERSE_TXD / UART_INVERSE_RTS / UART_INVERSE_CTS,
* combined with OR operation.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_line_inverse(uart_port_t uart_num, uint32_t inverse_mask);
/**
* @brief Set hardware flow control.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param flow_ctrl Hardware flow control mode
* @param rx_thresh Threshold of Hardware RX flow control (0 ~ UART_FIFO_LEN).
* Only when UART_HW_FLOWCTRL_RTS is set, will the rx_thresh value be set.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_hw_flow_ctrl(uart_port_t uart_num, uart_hw_flowcontrol_t flow_ctrl, uint8_t rx_thresh);
/**
* @brief Set software flow control.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param enable switch on or off
* @param rx_thresh_xon low water mark
* @param rx_thresh_xoff high water mark
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_sw_flow_ctrl(uart_port_t uart_num, bool enable, uint8_t rx_thresh_xon, uint8_t rx_thresh_xoff);
/**
* @brief Get hardware flow control mode
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param flow_ctrl Option for different flow control mode.
*
* @return
* - ESP_FAIL Parameter error
* - ESP_OK Success, result will be put in (*flow_ctrl)
*/
esp_err_t uart_get_hw_flow_ctrl(uart_port_t uart_num, uart_hw_flowcontrol_t* flow_ctrl);
/**
* @brief Clear UART interrupt status
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param clr_mask Bit mask of the interrupt status to be cleared.
* The bit mask should be composed from the fields of register UART_INT_CLR_REG.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_clear_intr_status(uart_port_t uart_num, uint32_t clr_mask);
/**
* @brief Set UART interrupt enable
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param enable_mask Bit mask of the enable bits.
* The bit mask should be composed from the fields of register UART_INT_ENA_REG.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_enable_intr_mask(uart_port_t uart_num, uint32_t enable_mask);
/**
* @brief Clear UART interrupt enable bits
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param disable_mask Bit mask of the disable bits.
* The bit mask should be composed from the fields of register UART_INT_ENA_REG.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_disable_intr_mask(uart_port_t uart_num, uint32_t disable_mask);
/**
* @brief Enable UART RX interrupt (RX_FULL & RX_TIMEOUT INTERRUPT)
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_enable_rx_intr(uart_port_t uart_num);
/**
* @brief Disable UART RX interrupt (RX_FULL & RX_TIMEOUT INTERRUPT)
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_disable_rx_intr(uart_port_t uart_num);
/**
* @brief Disable UART TX interrupt (TX_FULL & TX_TIMEOUT INTERRUPT)
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_disable_tx_intr(uart_port_t uart_num);
/**
* @brief Enable UART TX interrupt (TX_FULL & TX_TIMEOUT INTERRUPT)
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param enable 1: enable; 0: disable
* @param thresh Threshold of TX interrupt, 0 ~ UART_FIFO_LEN
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_enable_tx_intr(uart_port_t uart_num, int enable, int thresh);
/**
* @brief Register UART interrupt handler (ISR).
*
* @note UART ISR handler will be attached to the same CPU core that this function is running on.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param fn Interrupt handler function.
* @param arg parameter for handler function
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
* @param handle Pointer to return handle. If non-NULL, a handle for the interrupt will
* be returned here.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_isr_register(uart_port_t uart_num, void (*fn)(void*), void * arg, int intr_alloc_flags, uart_isr_handle_t *handle);
/**
* @brief Free UART interrupt handler registered by uart_isr_register. Must be called on the same core as
* uart_isr_register was called.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_isr_free(uart_port_t uart_num);
/**
* @brief Set UART pin number
*
* @note Internal signal can be output to multiple GPIO pads.
* Only one GPIO pad can connect with input signal.
*
* @note Instead of GPIO number a macro 'UART_PIN_NO_CHANGE' may be provided
to keep the currently allocated pin.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param tx_io_num UART TX pin GPIO number.
* @param rx_io_num UART RX pin GPIO number.
* @param rts_io_num UART RTS pin GPIO number.
* @param cts_io_num UART CTS pin GPIO number.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_pin(uart_port_t uart_num, int tx_io_num, int rx_io_num, int rts_io_num, int cts_io_num);
/**
* @brief Manually set the UART RTS pin level.
* @note UART must be configured with hardware flow control disabled.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param level 1: RTS output low (active); 0: RTS output high (block)
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_rts(uart_port_t uart_num, int level);
/**
* @brief Manually set the UART DTR pin level.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param level 1: DTR output low; 0: DTR output high
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_dtr(uart_port_t uart_num, int level);
/**
* @brief Set UART idle interval after tx FIFO is empty
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param idle_num idle interval after tx FIFO is empty(unit: the time it takes to send one bit
* under current baudrate)
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_set_tx_idle_num(uart_port_t uart_num, uint16_t idle_num);
/**
* @brief Set UART configuration parameters.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param uart_config UART parameter settings
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_param_config(uart_port_t uart_num, const uart_config_t *uart_config);
/**
* @brief Configure UART interrupts.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param intr_conf UART interrupt settings
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_intr_config(uart_port_t uart_num, const uart_intr_config_t *intr_conf);
/**
* @brief Install UART driver.
*
* UART ISR handler will be attached to the same CPU core that this function is running on.
*
* @note Rx_buffer_size should be greater than UART_FIFO_LEN. Tx_buffer_size should be either zero or greater than UART_FIFO_LEN.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param rx_buffer_size UART RX ring buffer size.
* @param tx_buffer_size UART TX ring buffer size.
* If set to zero, driver will not use TX buffer, TX function will block task until all data have been sent out.
* @param queue_size UART event queue size/depth.
* @param uart_queue UART event queue handle (out param). On success, a new queue handle is written here to provide
* access to UART events. If set to NULL, driver will not use an event queue.
* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info. Do not set ESP_INTR_FLAG_IRAM here
* (the driver's ISR handler is not located in IRAM)
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_driver_install(uart_port_t uart_num, int rx_buffer_size, int tx_buffer_size, int queue_size, QueueHandle_t* uart_queue, int intr_alloc_flags);
/**
* @brief Uninstall UART driver.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_driver_delete(uart_port_t uart_num);
/**
* @brief Wait until UART TX FIFO is empty.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param ticks_to_wait Timeout, count in RTOS ticks
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
* - ESP_ERR_TIMEOUT Timeout
*/
esp_err_t uart_wait_tx_done(uart_port_t uart_num, TickType_t ticks_to_wait);
/**
* @brief Send data to the UART port from a given buffer and length.
*
* This function will not wait for enough space in TX FIFO. It will just fill the available TX FIFO and return when the FIFO is full.
* @note This function should only be used when UART TX buffer is not enabled.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param buffer data buffer address
* @param len data length to send
*
* @return
* - (-1) Parameter error
* - OTHERS (>=0) The number of bytes pushed to the TX FIFO
*/
int uart_tx_chars(uart_port_t uart_num, const char* buffer, uint32_t len);
/**
* @brief Send data to the UART port from a given buffer and length,
*
* If the UART driver's parameter 'tx_buffer_size' is set to zero:
* This function will not return until all the data have been sent out, or at least pushed into TX FIFO.
*
* Otherwise, if the 'tx_buffer_size' > 0, this function will return after copying all the data to tx ring buffer,
* UART ISR will then move data from the ring buffer to TX FIFO gradually.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param src data buffer address
* @param size data length to send
*
* @return
* - (-1) Parameter error
* - OTHERS (>=0) The number of bytes pushed to the TX FIFO
*/
int uart_write_bytes(uart_port_t uart_num, const char* src, size_t size);
/**
* @brief Send data to the UART port from a given buffer and length,
*
* If the UART driver's parameter 'tx_buffer_size' is set to zero:
* This function will not return until all the data and the break signal have been sent out.
* After all data is sent out, send a break signal.
*
* Otherwise, if the 'tx_buffer_size' > 0, this function will return after copying all the data to tx ring buffer,
* UART ISR will then move data from the ring buffer to TX FIFO gradually.
* After all data sent out, send a break signal.
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param src data buffer address
* @param size data length to send
* @param brk_len break signal duration(unit: the time it takes to send one bit at current baudrate)
*
* @return
* - (-1) Parameter error
* - OTHERS (>=0) The number of bytes pushed to the TX FIFO
*/
int uart_write_bytes_with_break(uart_port_t uart_num, const char* src, size_t size, int brk_len);
/**
* @brief UART read bytes from UART buffer
*
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
* @param buf pointer to the buffer.
* @param length data length
* @param ticks_to_wait sTimeout, count in RTOS ticks
*
* @return
* - (-1) Error
* - OTHERS (>=0) The number of bytes read from UART FIFO
*/
int uart_read_bytes(uart_port_t uart_num, uint8_t* buf, uint32_t length, TickType_t ticks_to_wait);
/**
* @brief Alias of uart_flush_input.
* UART ring buffer flush. This will discard all data in the UART RX buffer.
* @note Instead of waiting the data sent out, this function will clear UART rx buffer.
* In order to send all the data in tx FIFO, we can use uart_wait_tx_done function.
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_flush(uart_port_t uart_num);
/**
* @brief Clear input buffer, discard all the data is in the ring-buffer.
* @note In order to send all the data in tx FIFO, we can use uart_wait_tx_done function.
* @param uart_num UART_NUM_0, UART_NUM_1 or UART_NUM_2
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_flush_input(uart_port_t uart_num);
/**
* @brief UART get RX ring buffer cached data length
*
* @param uart_num UART port number.
* @param size Pointer of size_t to accept cached data length
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_get_buffered_data_len(uart_port_t uart_num, size_t* size);
/**
* @brief UART disable pattern detect function.
* Designed for applications like 'AT commands'.
* When the hardware detects a series of one same character, the interrupt will be triggered.
*
* @param uart_num UART port number.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_disable_pattern_det_intr(uart_port_t uart_num);
/**
* @brief UART enable pattern detect function.
* Designed for applications like 'AT commands'.
* When the hardware detect a series of one same character, the interrupt will be triggered.
*
* @param uart_num UART port number.
* @param pattern_chr character of the pattern
* @param chr_num number of the character, 8bit value.
* @param chr_tout timeout of the interval between each pattern characters, 24bit value, unit is APB (80Mhz) clock cycle.
* When the duration is less than this value, it will not take this data as at_cmd char
* @param post_idle idle time after the last pattern character, 24bit value, unit is APB (80Mhz) clock cycle.
* When the duration is less than this value, it will not take the previous data as the last at_cmd char
* @param pre_idle idle time before the first pattern character, 24bit value, unit is APB (80Mhz) clock cycle.
* When the duration is less than this value, it will not take this data as the first at_cmd char
*
* @return
* - ESP_OK Success
* - ESP_FAIL Parameter error
*/
esp_err_t uart_enable_pattern_det_intr(uart_port_t uart_num, char pattern_chr, uint8_t chr_num, int chr_tout, int post_idle, int pre_idle);
/**
* @brief Return the nearest detected pattern position in buffer.
* The positions of the detected pattern are saved in a queue,
* this function will dequeue the first pattern position and move the pointer to next pattern position.
* @note If the RX buffer is full and flow control is not enabled,
* the detected pattern may not be found in the rx buffer due to overflow.
*
* The following APIs will modify the pattern position info:
* uart_flush_input, uart_read_bytes, uart_driver_delete, uart_pop_pattern_pos
* It is the application's responsibility to ensure atomic access to the pattern queue and the rx data buffer
* when using pattern detect feature.
*
* @param uart_num UART port number
* @return
* - (-1) No pattern found for current index or parameter error
* - others the pattern position in rx buffer.
*/
int uart_pattern_pop_pos(uart_port_t uart_num);
/**
* @brief Return the nearest detected pattern position in buffer.
* The positions of the detected pattern are saved in a queue,
* This function do nothing to the queue.
* @note If the RX buffer is full and flow control is not enabled,
* the detected pattern may not be found in the rx buffer due to overflow.
*
* The following APIs will modify the pattern position info:
* uart_flush_input, uart_read_bytes, uart_driver_delete, uart_pop_pattern_pos
* It is the application's responsibility to ensure atomic access to the pattern queue and the rx data buffer
* when using pattern detect feature.
*
* @param uart_num UART port number
* @return
* - (-1) No pattern found for current index or parameter error
* - others the pattern position in rx buffer.
*/
int uart_pattern_get_pos(uart_port_t uart_num);
/**
* @brief Allocate a new memory with the given length to save record the detected pattern position in rx buffer.
* @param uart_num UART port number
* @param queue_length Max queue length for the detected pattern.
* If the queue length is not large enough, some pattern positions might be lost.
* Set this value to the maximum number of patterns that could be saved in data buffer at the same time.
* @return
* - ESP_ERR_NO_MEM No enough memory
* - ESP_ERR_INVALID_STATE Driver not installed
* - ESP_FAIL Parameter error
* - ESP_OK Success
*/
esp_err_t uart_pattern_queue_reset(uart_port_t uart_num, int queue_length);
/**
* @brief UART set communication mode
* @note This function must be executed after uart_driver_install(), when the driver object is initialized.
* @param uart_num Uart number to configure
* @param mode UART UART mode to set
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t uart_set_mode(uart_port_t uart_num, uart_mode_t mode);
/**
* @brief UART set threshold timeout for TOUT feature
*
* @param uart_num Uart number to configure
* @param tout_thresh This parameter defines timeout threshold in uart symbol periods. The maximum value of threshold is 126.
* tout_thresh = 1, defines TOUT interrupt timeout equal to transmission time of one symbol (~11 bit) on current baudrate.
* If the time is expired the UART_RXFIFO_TOUT_INT interrupt is triggered. If tout_thresh == 0,
* the TOUT feature is disabled.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
* - ESP_ERR_INVALID_STATE Driver is not installed
*/
esp_err_t uart_set_rx_timeout(uart_port_t uart_num, const uint8_t tout_thresh);
/**
* @brief Returns collision detection flag for RS485 mode
* Function returns the collision detection flag into variable pointed by collision_flag.
* *collision_flag = true, if collision detected else it is equal to false.
* This function should be executed when actual transmission is completed (after uart_write_bytes()).
*
* @param uart_num Uart number to configure
* @param collision_flag Pointer to variable of type bool to return collision flag.
*
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Parameter error
*/
esp_err_t uart_get_collision_flag(uart_port_t uart_num, bool* collision_flag);
/**
* @brief Set the number of RX pin signal edges for light sleep wakeup
*
* UART can be used to wake up the system from light sleep. This feature works
* by counting the number of positive edges on RX pin and comparing the count to
* the threshold. When the count exceeds the threshold, system is woken up from
* light sleep. This function allows setting the threshold value.
*
* Stop bit and parity bits (if enabled) also contribute to the number of edges.
* For example, letter 'a' with ASCII code 97 is encoded as 0100001101 on the wire
* (with 8n1 configuration), start and stop bits included. This sequence has 3
* positive edges (transitions from 0 to 1). Therefore, to wake up the system
* when 'a' is sent, set wakeup_threshold=3.
*
* The character that triggers wakeup is not received by UART (i.e. it can not
* be obtained from UART FIFO). Depending on the baud rate, a few characters
* after that will also not be received. Note that when the chip enters and exits
* light sleep mode, APB frequency will be changing. To make sure that UART has
* correct baud rate all the time, select REF_TICK as UART clock source,
* by setting use_ref_tick field in uart_config_t to true.
*
* @note in ESP32, the wakeup signal can only be input via IO_MUX (i.e.
* GPIO3 should be configured as function_1 to wake up UART0,
* GPIO9 should be configured as function_5 to wake up UART1), UART2
* does not support light sleep wakeup feature.
*
* @param uart_num UART number
* @param wakeup_threshold number of RX edges for light sleep wakeup, value is 3 .. 0x3ff.
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_ARG if uart_num is incorrect or wakeup_threshold is
* outside of [3, 0x3ff] range.
*/
esp_err_t uart_set_wakeup_threshold(uart_port_t uart_num, int wakeup_threshold);
/**
* @brief Get the number of RX pin signal edges for light sleep wakeup.
*
* See description of uart_set_wakeup_threshold for the explanation of UART
* wakeup feature.
*
* @param uart_num UART number
* @param[out] out_wakeup_threshold output, set to the current value of wakeup
* threshold for the given UART.
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_ARG if out_wakeup_threshold is NULL
*/
esp_err_t uart_get_wakeup_threshold(uart_port_t uart_num, int* out_wakeup_threshold);
#ifdef __cplusplus
}
#endif
#endif /*_DRIVER_UART_H_*/
You can’t perform that action at this time.