152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2021-05-20 bigmagic first version
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*/
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#include <rthw.h>
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#include <rtdevice.h>
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#include "board.h"
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#include "drv_uart.h"
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#include <stdio.h>
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#include "sbi.h"
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#include "interrupt.h"
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struct device_uart
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{
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rt_ubase_t hw_base;
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rt_uint32_t irqno;
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};
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static rt_err_t rt_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg);
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static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg);
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static int drv_uart_putc(struct rt_serial_device *serial, char c);
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static int drv_uart_getc(struct rt_serial_device *serial);
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void virt_uart_init(void)
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{
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//http://byterunner.com/16550.html
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uart_write_reg(IER, 0x00);
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uint8_t lcr = uart_read_reg(LCR);
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uart_write_reg(LCR, lcr | (1 << 7));
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uart_write_reg(DLL, 0x03);
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uart_write_reg(DLM, 0x00);
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lcr = 0;
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uart_write_reg(LCR, lcr | (3 << 0));
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/*
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* enable receive interrupts.
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*/
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uint8_t ier = uart_read_reg(IER);
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uart_write_reg(IER, ier | (1 << 0));
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}
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/*
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* UART interface
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*/
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static rt_err_t rt_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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struct device_uart *uart;
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RT_ASSERT(serial != RT_NULL);
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serial->config = *cfg;
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return (RT_EOK);
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}
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static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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struct device_uart *uart;
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uart = serial->parent.user_data;
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rt_uint32_t channel = 1;
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RT_ASSERT(uart != RT_NULL);
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RT_ASSERT(channel != 3);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT:
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break;
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case RT_DEVICE_CTRL_SET_INT:
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break;
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}
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return (RT_EOK);
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}
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static int drv_uart_putc(struct rt_serial_device *serial, char c)
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{
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while ((uart_read_reg(LSR) & LSR_TX_IDLE) == 0);
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return uart_write_reg(THR, c);
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}
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static int drv_uart_getc(struct rt_serial_device *serial)
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{
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if (uart_read_reg(LSR) & LSR_RX_READY){
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return uart_read_reg(RHR);
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} else {
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return -1;
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}
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//return sbi_console_getchar();
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}
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static void rt_hw_uart_isr(int irqno, void *param)
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{
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struct rt_serial_device *serial = (struct rt_serial_device*)param;
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rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
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}
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struct rt_serial_device serial1;
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struct device_uart uart1;
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const struct rt_uart_ops _uart_ops =
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{
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rt_uart_configure,
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uart_control,
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drv_uart_putc,
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drv_uart_getc,
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RT_NULL
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};
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/*
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* UART Initiation
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*/
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int rt_hw_uart_init(void)
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{
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struct rt_serial_device *serial;
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struct device_uart *uart;
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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{
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serial = &serial1;
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uart = &uart1;
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serial->ops = &_uart_ops;
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serial->config = config;
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serial->config.baud_rate = UART_DEFAULT_BAUDRATE;
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uart->hw_base = UART_BASE;
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uart->irqno = UART0_IRQ;
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virt_uart_init();
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rt_hw_serial_register(serial,
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"uart",
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RT_DEVICE_FLAG_STREAM | RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
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uart);
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rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, serial, "uart");
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rt_hw_interrupt_umask(uart->irqno);
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}
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return 0;
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}
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