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/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
#ifndef __DRV_UART_H__
#define __DRV_UART_H__
#include "riscv_io.h"
/**
* uart ns16550a
* http://byterunner.com/16550.html
*/
/* TRANSMIT AND RECEIVE HOLDING REGISTER */
#define UART_RHR 0
#define UART_THR 0
/* INTERRUPT ENABLE REGISTER */
#define UART_IER 1
#define UART_IER_RX_ENABLE (1 << 0)
#define UART_IER_TX_ENABLE (1 << 1)
/* FIFO CONTROL REGISTER */
#define UART_FCR 2
#define UART_FCR_FIFO_ENABLE (1 << 0)
#define UART_FCR_FIFO_CLEAR (3 << 1)
/* INTERRUPT STATUS REGISTER */
#define UART_ISR 2
/* LINE CONTROL REGISTER */
#define UART_LCR 3
#define UART_LCR_EIGHT_BITS (3 << 0)
// special mode to set baud rate
#define UART_LCR_BAUD_LATCH (1 << 7)
/* LINE STATUS REGISTER */
#define UART_LSR 5
// input is waiting to be read from RHR
#define UART_LSR_RX_READY (1 << 0)
// THR can accept another character to send
#define UART_LSR_TX_IDLE (1 << 5)
#define UART_REFERENCE_CLOCK 1843200
#define UART_DEFAULT_BAUDRATE 115200
extern void *uart0_base;
#define write8_uart0(idx, value) __raw_writeb(((rt_uint8_t)value), (void*)((size_t)uart0_base + (idx)))
#define read8_uart0(idx) __raw_readb((void*)((size_t)uart0_base + (idx)))
void rt_hw_uart_start_rx_thread();
int rt_hw_uart_init(void);
void drv_uart_puts(char *str); // for syscall
#endif /* __DRV_UART_H__ */
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