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251 lines
5.1 KiB
251 lines
5.1 KiB
/*
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* Copyright (c) 2006-2018, 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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* 2021-02-02 michael5hzg@gmail.com adapt to ls1b
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*/
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// 串口相关源码
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#include <stdio.h>
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#include <stdarg.h>
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#include "ls1b_public.h"
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#include "ls1b_regs.h"
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#include "ls1b_pin.h"
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#include "ls1b_uart.h"
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#include "ls1b_clock.h"
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#include "ls1b.h"
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// 串口线路状态寄存器的位域
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#define LS1B_UART_LSR_TE (1 << 6)
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#define LS1B_UART_LSR_TFE (1 << 5)
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// 打印缓存的大小
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#define LS1B_UART_PRINT_BUF_SIZE (256)
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// 调试串口信息
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ls1b_uart_info_t debug_uart_info = {0};
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/*
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* 获取指定串口模块的基地址
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* @UARTx 串口编号
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* @ret 基地址
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*/
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void *uart_get_base(ls1b_uart_t UARTx)
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{
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void *base = NULL;
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switch (UARTx)
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{
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case LS1B_UART00:
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base = (void *)LS1B_UART00_BASE;
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break;
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case LS1B_UART01:
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base = (void *)LS1B_UART01_BASE;
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break;
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case LS1B_UART1:
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base = (void *)LS1B_UART1_BASE;
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break;
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case LS1B_UART2:
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base = (void *)LS1B_UART2_BASE;
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break;
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case LS1B_UART3:
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base = (void *)LS1B_UART3_BASE;
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break;
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case LS1B_UART4:
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base = (void *)LS1B_UART4_BASE;
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break;
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case LS1B_UART5:
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base = (void *)LS1B_UART5_BASE;
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break;
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case LS1B_UART6:
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base = (void *)LS1B_UART6_BASE;
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break;
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case LS1B_UART7:
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base = (void *)LS1B_UART7_BASE;
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break;
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case LS1B_UART8:
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base = (void *)LS1B_UART8_BASE;
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break;
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case LS1B_UART9:
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base = (void *)LS1B_UART9_BASE;
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break;
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case LS1B_UART10:
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base = (void *)LS1B_UART10_BASE;
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break;
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case LS1B_UART11:
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base = (void *)LS1B_UART11_BASE;
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break;
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default:
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break;
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}
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return base;
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}
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/*
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* 初始化指定的串口模块
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* @uart_info_p 串口模块信息
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*/
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void uart_init(ls1b_uart_info_t *uart_info_p)
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{
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void *uart_base = uart_get_base(uart_info_p->UARTx);
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unsigned long baudrate_div = 0;
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// 禁止所有中断
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reg_write_8(0, uart_base + LS1B_UART_IER_OFFSET);
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// 接收FIFO的中断申请Trigger为14字节，清空发送和接收FIFO，并复位
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reg_write_8(0xc3, uart_base + LS1B_UART_FCR_OFFSET);
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// 设置波特率
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reg_write_8(0x80, uart_base + LS1B_UART_LCR_OFFSET);
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baudrate_div = clk_get_apb_rate() / 16 / uart_info_p->baudrate;
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reg_write_8((baudrate_div >> 8) & 0xff, uart_base + LS1B_UART_MSB_OFFSET);
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reg_write_8(baudrate_div & 0xff, uart_base + LS1B_UART_LSB_OFFSET);
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// 8个数据位，1个停止位，无校验
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reg_write_8(0x03, uart_base + LS1B_UART_LCR_OFFSET);
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// 使能接收中断
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if (TRUE == uart_info_p->rx_enable)
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{
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reg_write_8(IER_IRxE|IER_ILE , uart_base + LS1B_UART_IER_OFFSET);
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}
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return ;
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}
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/*
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* 判断FIFO是否为空
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* @uartx 串口号
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* @ret TRUE or FALSE
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*/
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BOOL uart_is_transmit_empty(ls1b_uart_t uartx)
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{
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void *uart_base = uart_get_base(uartx);
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unsigned char status = reg_read_8(uart_base + LS1B_UART_LSR_OFFSET);
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if (status & (LS1B_UART_LSR_TE | LS1B_UART_LSR_TFE))
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{
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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/*
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* 发送一个字节
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* @uartx 串口号
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* @ch 待发送的字符串
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*/
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void uart_putc(ls1b_uart_t uartx, unsigned char ch)
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{
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void *uart_base = uart_get_base(uartx);
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// 等待
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while (FALSE == uart_is_transmit_empty(uartx))
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;
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// 发送
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reg_write_8(ch, uart_base + LS1B_UART_DAT_OFFSET);
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return ;
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}
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/*
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* 打印一个字符串到指定串口
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* @uartx 串口号
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* @str 待打印的字符串
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*/
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void uart_print(ls1b_uart_t uartx, const char *str)
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{
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while ('\0' != *str) // 判断是否为字符串结束符
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{
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uart_putc(uartx, *str); // 发送一个字符
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str++;
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}
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return ;
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}
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/*
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* 初始化串口2
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*/
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void uart2_init(void)
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{
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unsigned int tx_gpio = 37;
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unsigned int rx_gpio = 36;
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// 设置复用
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pin_set_remap(tx_gpio, PIN_REMAP_SECOND);
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pin_set_remap(rx_gpio, PIN_REMAP_SECOND);
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// 初始化相关寄存器
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debug_uart_info.UARTx = LS1B_UART2;
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debug_uart_info.baudrate = 115200;
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debug_uart_info.rx_enable = FALSE; // 调试串口只需要打印(发送)功能，不需要接收功能
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uart_init(&debug_uart_info);
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return ;
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}
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/*
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* 在串口2上打印字符串
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* @str 待打印的字符串
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*/
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void uart2_print(const char *str)
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{
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uart_print(LS1B_UART2, str);
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return ;
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}
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/*
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* 在调试串口打印字符串
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* @str 待打印的字符串
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*/
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void uart_debug_print(const char *str)
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{
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uart_print(debug_uart_info.UARTx, str);
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return ;
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}
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/*
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* 在调试串口打印一个字符
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* @ch 待打印的字符
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*/
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void uart_debug_putc(unsigned char ch)
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{
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uart_putc(debug_uart_info.UARTx, ch);
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return ;
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}
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