esp-idf/components/esp_rom/include/esp_rom_uart.h

102 lines
2.7 KiB
C

// Copyright 2010-2020 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.
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#define ESP_ROM_CDC_ACM_WORK_BUF_MIN 128
typedef enum {
ESP_ROM_UART_0,
ESP_ROM_UART_1,
ESP_ROM_UART_USB
} esp_rom_uart_num_t;
/**
* @brief Wait for UART TX FIFO is empty and all data has been sent out.
*
* @param uart_no UART port number
*/
void esp_rom_uart_tx_wait_idle(uint8_t uart_no);
/**
* @brief Set clock source and baud rate for UART.
*
* @param uart_no UART port number
* @param clock_hz Source clock (in Hz)
* @param baud_rate Baud rate to set
*/
void esp_rom_uart_set_clock_baudrate(uint8_t uart_no, uint32_t clock_hz, uint32_t baud_rate);
/**
* @brief Wait until UART TX FIFO is empty (i.e. flush TX FIFO)
*
* @param uart_no UART port number
*/
void esp_rom_uart_flush_tx(uint8_t uart_no);
/**
* @brief Transmit one character to the console channel.
*
* @param c Character to send
* @return
* - 0 on success
* - 1 on failure
*/
int esp_rom_uart_tx_one_char(uint8_t c);
/**
* @brief Get one character from the console channel.
*
* @param c Where to store the character
* @return
* - 0 on success
* - 1 on failure or no data available
*/
int esp_rom_uart_rx_one_char(uint8_t *c);
/**
* @brief Get one line of string from console channel (line ending won't be stored in the buffer).
*
* @param str Where to store the string
* @param max_len Maximum length of the buffer (including the NULL delimiter)
* @return always return 0 when on success or wait in a loop for rx data
*/
int esp_rom_uart_rx_string(uint8_t *str, uint8_t max_len);
/**
* @brief Set the UART port used by ets_printf.
*
* @param uart_no UART port number
*/
void esp_rom_uart_set_as_console(uint8_t uart_no);
/**
* @brief Initialize the USB ACM UART
* @note The ACM working memroy should be at least 128 bytes (ESP_ROM_CDC_ACM_WORK_BUF_MIN) in size.
*
* @param cdc_acm_work_mem Pointer to the work memroy used for CDC-ACM
* @param cdc_acm_work_mem_len Length of work memory
*/
void esp_rom_uart_usb_acm_init(void *cdc_acm_work_mem, int cdc_acm_work_mem_len);
#ifdef __cplusplus
}
#endif