uart2.h

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/*
 * Copyright (c) 2024 ykat UG (haftungsbeschraenkt) - All Rights Reserved
 *
 * Permission for non-commercial use is hereby granted,
 * free of charge, without warranty of any kind.
 */
#ifndef ZRTOS_VFS_MODULE_AVR_UART_UART2_H
#define ZRTOS_VFS_MODULE_AVR_UART_UART2_H
#ifdef __cplusplus
extern "C" {
#endif

#include <zrtos/vfs/module/uart/uart.h>
#include <zrtos/vfs/module/avr/uart/uart.h>

zrtos_vfs_module_uart_inode_t *zrtos_vfs_module_avr_uart2;

ISR(UART2_RECEIVE_INTERRUPT){
    zrtos_vfs_module_avr_uart__on_receive_interrupt(
         zrtos_vfs_module_avr_uart2
        ,UART2_DATA
        ,(
              (UART2_STATUS & (_BV(FE2)|_BV(DOR2)|_BV(UPE2))) == 0
            ? ZRTOS_ERROR__SUCCESS
            : ZRTOS_ERROR__IO
        )
    );
}

ISR(UART2_TRANSMIT_INTERRUPT,ISR_NOBLOCK){
    uint8_t tmp;
    if(zrtos_vfs_module_avr_uart__on_transmit_interrupt(
         zrtos_vfs_module_avr_uart2
        ,&tmp
    )){
        UART2_DATA = tmp;
    }else{
        UART2_CONTROL &= ~_BV(UART2_UDRIE);
    }
}

zrtos_error_t zrtos_vfs_module_avr_uart2__on_mount(zrtos_vfs_dentry_t *thiz){
    uint16_t baudrate;
    zrtos_vfs_module_avr_uart2 = ZRTOS_CAST(
         zrtos_vfs_module_uart_inode_t*
        ,zrtos_vfs_dentry__get_inode_data(
            thiz
        )
    );

    baudrate = zrtos_vfs_module_avr_uart__baud_select(
         zrtos_vfs_module_avr_uart2->baudrate
    );

    //Set baud rate
    if(ZRTOS_VFS_MODULE_AVR_UART__IS_DOUBLE_SPEED(baudrate)){
        UART2_STATUS = _BV(U2X2);  //Enable 2x speed
        baudrate &= ~0x8000;
    }else{
        UART2_STATUS = 0;
        //UART2_STATUS &= ~_BV(U2X2);
    }
    UBRR2H = (uint8_t) (baudrate>>8);
    UBRR2L = (uint8_t) baudrate;

    /* Enable USART receiver and transmitter and receive complete interrupt */
    UART2_CONTROL = _BV(RXCIE2)|_BV(RXEN2)|_BV(TXEN2);
    //UART2_CONTROL = _BV(RXCIE2)|_BV(TXEN2);

    /* Set frame format: asynchronous, 8data, no parity, 1stop bit */
#ifdef URSEL2
    UCSR2C = _BV(URSEL2)|_BV(UCSZ21)|_BV(UCSZ20);
#else
    UCSR2C = _BV(UCSZ21)|_BV(UCSZ20);
#endif

    return ZRTOS_ERROR__SUCCESS;
}

zrtos_error_t zrtos_vfs_module_avr_uart2__on_umount(zrtos_vfs_dentry_t *thiz){
    UART2_CONTROL &= ~_BV(UART2_UDRIE);
    return ZRTOS_ERROR__SUCCESS;
}

zrtos_error_t zrtos_vfs_module_avr_uart2__on_write(
     zrtos_vfs_file_t *thiz
    ,char *path
    ,void *buf
    ,size_t len
    ,zrtos_vfs_offset_t offset
    ,size_t *out
){
    zrtos_error_t ret = zrtos_vfs_module_uart__on_write(
         thiz
        ,path
        ,buf
        ,len
        ,offset
        ,out
    );
    if(zrtos_error__is_success(ret)){
        UART2_CONTROL |= _BV(UART2_UDRIE);
    }
    return ret;
}

ZRTOS_VFS_PLUGIN__INIT(avr_uart2,
    ZRTOS_VFS_PLUGIN__0_ON_OPEN_DEFAULT()
    ZRTOS_VFS_PLUGIN__1_ON_CLOSE_DEFAULT()
    ZRTOS_VFS_PLUGIN__2_ON_MOUNT(zrtos_vfs_module_avr_uart2__on_mount)
    ZRTOS_VFS_PLUGIN__3_ON_UMOUNT(zrtos_vfs_module_avr_uart2__on_umount)
    ZRTOS_VFS_PLUGIN__4_ON_READ(zrtos_vfs_module_uart__on_read)
    ZRTOS_VFS_PLUGIN__5_ON_WRITE(zrtos_vfs_module_avr_uart2__on_write)
    ZRTOS_VFS_PLUGIN__6_ON_CAN_READ(zrtos_vfs_module_uart__on_can_read)
    ZRTOS_VFS_PLUGIN__7_ON_CAN_WRITE(zrtos_vfs_module_uart__on_can_write)
    ZRTOS_VFS_PLUGIN__8_ON_SEEK_DEFAULT()
    ZRTOS_VFS_PLUGIN__9_ON_IOCTL(zrtos_vfs_module_uart__on_ioctl)
);

#ifdef __cplusplus
}
#endif
#endif