ESP32 RMT UART

Component for Espressif ESP32 ESP-IDF framework.

This components uses ESP32's RMT peripheral as an UART port. It can send and receive UART frames as well.

Supported versions of frameworks and devices

Chip	Framework	Versions	Number of UART
ESP32-S2	ESP-IDF	v4.3 and above	2
ESP32-C3	ESP-IDF	v4.3 and above	2
ESP32-S3	ESP-IDF	v4.3 and above	4

How to Use

Clone this repository to your project components directory.

Configuration

typedef struct {
    int baud_rate;                        /*!< UART baud rate*/
    rmt_uart_mode_t mode;                 /*!< UART mode*/  
    rmt_uart_word_length_t data_bits;     /*!< UART byte size*/
    rmt_uart_parity_t parity;             /*!< UART parity mode*/
    rmt_uart_stop_bits_t stop_bits;       /*!< UART stop bits*/
    gpio_num_t tx_io_num;                 /*!< UART TX GPIO num*/
    gpio_num_t rx_io_num;                 /*!< UART RX GPIO num*/
    size_t buffer_size;                   /*!< UART buffer size/*>
} rmt_uart_config_t;

Mode can be TX only, RX only or both TX and RX.
Buffer size must be 20 times of the length of transmit/receive data. If you want to send 10 bytes maximum then buffer_size = 200.

Restrictions

Due to hardware limitations ESP32-S2 can only receive 12 bytes at once. In RX only mode this limit is 24 bytes. Transmit has no restriction.