diff options
Diffstat (limited to 'bsp/ls1bdev/libraries/ls1b_uart.c')
| -rw-r--r-- | bsp/ls1bdev/libraries/ls1b_uart.c | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/bsp/ls1bdev/libraries/ls1b_uart.c b/bsp/ls1bdev/libraries/ls1b_uart.c new file mode 100644 index 0000000000..73d88438f5 --- /dev/null +++ b/bsp/ls1bdev/libraries/ls1b_uart.c @@ -0,0 +1,251 @@ + /* + * Copyright (c) 2006-2018, RT-Thread Development Team + * + * SPDX-License-Identifier: Apache-2.0 + * + * Change Logs: + * Date Author Notes + * 2021-02-02 [email protected] adapt to ls1b + */ +// 串口相关源码 + +#include <stdio.h> +#include <stdarg.h> +#include "ls1b_public.h" +#include "ls1b_regs.h" +#include "ls1b_pin.h" +#include "ls1b_uart.h" +#include "ls1b_clock.h" +#include "ls1b.h" + + +// 串口线路状态寄存器的位域 +#define LS1B_UART_LSR_TE (1 << 6) +#define LS1B_UART_LSR_TFE (1 << 5) + + +// 打印缓存的大小 +#define LS1B_UART_PRINT_BUF_SIZE (256) + + +// 调试串口信息 +ls1b_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(ls1b_uart_t UARTx) +{ + void *base = NULL; + + switch (UARTx) + { + case LS1B_UART00: + base = (void *)LS1B_UART00_BASE; + break; + case LS1B_UART01: + base = (void *)LS1B_UART01_BASE; + break; + + case LS1B_UART1: + base = (void *)LS1B_UART1_BASE; + break; + + case LS1B_UART2: + base = (void *)LS1B_UART2_BASE; + break; + + case LS1B_UART3: + base = (void *)LS1B_UART3_BASE; + break; + + case LS1B_UART4: + base = (void *)LS1B_UART4_BASE; + break; + + case LS1B_UART5: + base = (void *)LS1B_UART5_BASE; + break; + + case LS1B_UART6: + base = (void *)LS1B_UART6_BASE; + break; + + case LS1B_UART7: + base = (void *)LS1B_UART7_BASE; + break; + + case LS1B_UART8: + base = (void *)LS1B_UART8_BASE; + break; + + case LS1B_UART9: + base = (void *)LS1B_UART9_BASE; + break; + + case LS1B_UART10: + base = (void *)LS1B_UART10_BASE; + break; + + case LS1B_UART11: + base = (void *)LS1B_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(ls1b_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 + LS1B_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 + LS1B_UART_FCR_OFFSET); + + // 设置波特率 + reg_write_8(0x80, uart_base + LS1B_UART_LCR_OFFSET); + baudrate_div = clk_get_apb_rate() / 16 / uart_info_p->baudrate; + reg_write_8((baudrate_div >> 8) & 0xff, uart_base + LS1B_UART_MSB_OFFSET); + reg_write_8(baudrate_div & 0xff, uart_base + LS1B_UART_LSB_OFFSET); + + // 8个数据位，1个停止位，无校验 + reg_write_8(0x03, uart_base + LS1B_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 + LS1B_UART_IER_OFFSET); + } + + return ; +} + + +/* + * 判断FIFO是否为空 + * @uartx 串口号 + * @ret TRUE or FALSE + */ +BOOL uart_is_transmit_empty(ls1b_uart_t uartx) +{ + void *uart_base = uart_get_base(uartx); + unsigned char status = reg_read_8(uart_base + LS1B_UART_LSR_OFFSET); + + if (status & (LS1B_UART_LSR_TE | LS1B_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(ls1b_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 + LS1B_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(ls1b_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 = LS1B_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(LS1B_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 ; +} + + |