rt-thread/bsp/ls1cdev/libraries/ls1c_uart.c

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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* first version
*/
// 串口相关源码
#include <stdio.h>
#include <stdarg.h>
#include "ls1c_public.h"
#include "ls1c_regs.h"
#include "ls1c_pin.h"
#include "ls1c_uart.h"
#include "ls1c_clock.h"
#include "ls1c.h"
// 串口线路状态寄存器的位域
#define LS1C_UART_LSR_TE (1 << 6)
#define LS1C_UART_LSR_TFE (1 << 5)
// 打印缓存的大小
#define LS1C_UART_PRINT_BUF_SIZE (256)
// 调试串口信息
ls1c_uart_info_t debug_uart_info = {0};
/*
* 获取指定串口模块的基地址
* @UARTx 串口编号
* @ret 基地址
*/
void *uart_get_base(ls1c_uart_t UARTx)
{
void *base = NULL;
switch (UARTx)
{
case LS1C_UART00:
base = (void *)LS1C_UART00_BASE;
break;
case LS1C_UART01:
base = (void *)LS1C_UART01_BASE;
break;
case LS1C_UART1:
base = (void *)LS1C_UART1_BASE;
break;
case LS1C_UART2:
base = (void *)LS1C_UART2_BASE;
break;
case LS1C_UART3:
base = (void *)LS1C_UART3_BASE;
break;
case LS1C_UART4:
base = (void *)LS1C_UART4_BASE;
break;
case LS1C_UART5:
base = (void *)LS1C_UART5_BASE;
break;
case LS1C_UART6:
base = (void *)LS1C_UART6_BASE;
break;
case LS1C_UART7:
base = (void *)LS1C_UART7_BASE;
break;
case LS1C_UART8:
base = (void *)LS1C_UART8_BASE;
break;
case LS1C_UART9:
base = (void *)LS1C_UART9_BASE;
break;
case LS1C_UART10:
base = (void *)LS1C_UART10_BASE;
break;
case LS1C_UART11:
base = (void *)LS1C_UART11_BASE;
break;
default:
break;
}
return base;
}
/*
* 初始化指定的串口模块
* @uart_info_p 串口模块信息
*/
void uart_init(ls1c_uart_info_t *uart_info_p)
{
void *uart_base = uart_get_base(uart_info_p->UARTx);
unsigned long baudrate_div = 0;
// 禁止所有中断
reg_write_8(0, uart_base + LS1C_UART_IER_OFFSET);
// 接收FIFO的中断申请Trigger为14字节清空发送和接收FIFO并复位
reg_write_8(0xc3, uart_base + LS1C_UART_FCR_OFFSET);
// 设置波特率
reg_write_8(0x80, uart_base + LS1C_UART_LCR_OFFSET);
baudrate_div = clk_get_cpu_rate() / 16 / uart_info_p->baudrate / 2;
reg_write_8((baudrate_div >> 8) & 0xff, uart_base + LS1C_UART_MSB_OFFSET);
reg_write_8(baudrate_div & 0xff, uart_base + LS1C_UART_LSB_OFFSET);
// 8个数据位1个停止位无校验
reg_write_8(0x03, uart_base + LS1C_UART_LCR_OFFSET);
// 使能接收中断
if (TRUE == uart_info_p->rx_enable)
{
reg_write_8(IER_IRxE|IER_ILE , uart_base + LS1C_UART_IER_OFFSET);
}
return ;
}
/*
* 判断FIFO是否为空
* @uartx 串口号
* @ret TRUE or FALSE
*/
BOOL uart_is_transmit_empty(ls1c_uart_t uartx)
{
void *uart_base = uart_get_base(uartx);
unsigned char status = reg_read_8(uart_base + LS1C_UART_LSR_OFFSET);
if (status & (LS1C_UART_LSR_TE | LS1C_UART_LSR_TFE))
{
return TRUE;
}
else
{
return FALSE;
}
}
/*
* 发送一个字节
* @uartx 串口号
* @ch 待发送的字符串
*/
void uart_putc(ls1c_uart_t uartx, unsigned char ch)
{
void *uart_base = uart_get_base(uartx);
// 等待
while (FALSE == uart_is_transmit_empty(uartx))
;
// 发送
reg_write_8(ch, uart_base + LS1C_UART_DAT_OFFSET);
return ;
}
/*
* 打印一个字符串到指定串口
* @uartx 串口号
* @str 待打印的字符串
*/
void uart_print(ls1c_uart_t uartx, const char *str)
{
while ('\0' != *str) // 判断是否为字符串结束符
{
uart_putc(uartx, *str); // 发送一个字符
str++;
}
return ;
}
/*
* 初始化串口2
*/
void uart2_init(void)
{
unsigned int tx_gpio = 37;
unsigned int rx_gpio = 36;
// 设置复用
pin_set_remap(tx_gpio, PIN_REMAP_SECOND);
pin_set_remap(rx_gpio, PIN_REMAP_SECOND);
// 初始化相关寄存器
debug_uart_info.UARTx = LS1C_UART2;
debug_uart_info.baudrate = 115200;
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
uart_init(&debug_uart_info);
return ;
}
/*
* 在串口2上打印字符串
* @str 待打印的字符串
*/
void uart2_print(const char *str)
{
uart_print(LS1C_UART2, str);
return ;
}
/*
* 在调试串口打印字符串
* @str 待打印的字符串
*/
void uart_debug_print(const char *str)
{
uart_print(debug_uart_info.UARTx, str);
return ;
}
/*
* 在调试串口打印一个字符
* @ch 待打印的字符
*/
void uart_debug_putc(unsigned char ch)
{
uart_putc(debug_uart_info.UARTx, ch);
return ;
}
/*
* 把中断号转换为串口号
* @IRQn 中断号
* @ret 串口号
*/
ls1c_uart_t uart_irqn_to_uartx(int IRQn)
{
ls1c_uart_t uartx = LS1C_UART2;
switch (IRQn)
{
/* 串口UART00和UART01的中断号还待确定
case LS1C_UART00_IRQ:
uartx = LS1C_UART00;
break;
case LS1C_UART01_IRQ:
uartx = LS1C_UART01;
break;
*/
case LS1C_UART1_IRQ:
uartx = LS1C_UART1;
break;
case LS1C_UART2_IRQ:
uartx = LS1C_UART2;
break;
case LS1C_UART3_IRQ:
uartx = LS1C_UART3;
break;
case LS1C_UART4_IRQ:
uartx = LS1C_UART4;
break;
case LS1C_UART5_IRQ:
uartx = LS1C_UART5;
break;
case LS1C_UART6_IRQ:
uartx = LS1C_UART6;
break;
case LS1C_UART7_IRQ:
uartx = LS1C_UART7;
break;
case LS1C_UART8_IRQ:
uartx = LS1C_UART8;
break;
case LS1C_UART9_IRQ:
uartx = LS1C_UART9;
break;
case LS1C_UART10_IRQ:
uartx = LS1C_UART10;
break;
case LS1C_UART11_IRQ:
uartx = LS1C_UART11;
break;
default:
uartx = LS1C_UART2;
break;
}
return uartx;
}