From 5995cb307ed1f198f94c33a384441801a91a970e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=B8=B8=E4=B9=90=E5=9C=BA?= <121892803@qq.com> Date: Thu, 28 Apr 2022 04:53:52 -0700 Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E4=B8=B2=E5=8F=A3=E4=BE=8B?= =?UTF-8?q?=E7=A8=8B2?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../sample/B7_basic_uart_2/BUILD.gn | 25 ++++ .../sample/B7_basic_uart_2/README.md | 139 ++++++++++++++++++ .../sample/B7_basic_uart_2/uart_example2.c | 109 ++++++++++++++ 3 files changed, 273 insertions(+) create mode 100755 applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/BUILD.gn create mode 100755 applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/README.md create mode 100755 applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/uart_example2.c diff --git a/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/BUILD.gn b/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/BUILD.gn new file mode 100755 index 000000000..9f5e8e5b1 --- /dev/null +++ b/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/BUILD.gn @@ -0,0 +1,25 @@ +# Copyright (c) 2020 Nanjing Xiaoxiongpai Intelligent Technology Co., Ltd. +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. + +static_library("uart_example2") { + sources = [ + "uart_example2.c" + ] + + include_dirs = [ + "//utils/native/lite/include", + "//kernel/liteos_m/components/cmsis/2.0", + "//base/iot_hardware/interfaces/kits/wifiiot_lite", + "//vendor/hisi/hi3861/hi3861/platform/include", + ] +} diff --git a/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/README.md b/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/README.md new file mode 100755 index 000000000..a8b5589e0 --- /dev/null +++ b/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/README.md @@ -0,0 +1,139 @@ +# BearPi-HM_Nano开发板基础外设开发——UART数据读写 +本示例将演示如何在BearPi-HM_Nano开发板上使用UART进行数据的收发 + +![BearPi-HM_Nano](/applications/BearPi/BearPi-HM_Nano/docs/figures/00_public/BearPi-HM_Nano.png) +## 注意点 +本例使用的uart1，其txd脚也就是芯片的18脚为硬件配置字，上电时必须低电平，所以必须等烧录成功并完成重启之后再连接串口模块。 +## UART API分析 +本示例主要使用了以下API完成UART数据读写 +## hi_uart_init() +```c +hi_u32 hi_uart_init(hi_uart_idx id, const hi_uart_attribute *param, const hi_uart_extra_attr *extra_attr) +``` + **描述：** + +配置一个UART设备。 +**参数：** + +|名字|描述| +|:--|:------| +| id | UART端口号. | +| param |表示基本UART属性| +| extraAttr |表示扩展UART属性| + +## hi_uart_write() +```c +hi_s32 hi_uart_write(hi_uart_idx id, const hi_u8 *data, hi_u32 data_len) +``` + **描述：** +将数据写入UART设备 + + +**参数：** + +|名字|描述| +|:--|:------| +| id | UART端口号. | +| data |表示指向要写入数据的起始地址的指针| +| dataLen |表示读取数据的长度| + +## hi_uart_read_timeout() +```c +hi_s32 hi_uart_read_timeout(hi_uart_idx id, hi_u8 *data, hi_u32 len, hi_u32 timeout_ms) +``` + **描述：** + +从UART设备读取数据。 + + +**参数：** + +|名字|描述| +|:--|:------| +| id | UART端口号. | +| data |表示指向要读取数据的起始地址的指针| +| dataLen |表示读取数据的长度| +| timeout_ms |表示读取数据的超时时间| + + + +## 硬件设计 +本案例将用 BearPi-HM_Nano 开发板 E53 接口的 UART 作为测试，如原理图所示第 18 和 19 脚分别为 TXD 和 RXD ，连接了主控芯片的 GPIO_6 和 GPIO_5 ，所以在编写软件的时候需要将 GPIO_6 和 GPIO_5 分别复用为 TXD 和 RXD 。 + +![](/applications/BearPi/BearPi-HM_Nano/docs/figures/B6_basic_uart/E53接口电路.png "E53接口电路") + +## 软件设计 + +**主要代码分析** + +这部分代码为UART初始化的代码，首先要在 `hi_uart_attribute` 结构体这配置波特率、数据位、停止位、奇偶检验位，然后通过 `hi_uart_init()` 函数对串口1进行配置。 + +```c + hi_uart_attribute uart_attr = { + .baud_rate = 115200, + .data_bits = 8, + .stop_bits = 1, + .parity = 0, + }; + + //Initialize uart driver + ret = hi_uart_init(HI_UART_IDX_1, &uart_attr, NULL); + if (ret != HI_ERR_SUCCESS) + { + printf("Failed to init uart! Err code = %d\n", ret); + return; + } +``` +这部分的代码为接收线程，阻塞在uart1_recv进行串口接收，接收到数据之后调用处理函数进行处理 +```c + while (1) + { + //阻塞等待串口1数据 + rxlen=uart1_recv(uart_buff_ptr, UART_BUFF_SIZE); + //处理数据 + uart1_rxproc(uart_buff_ptr,rxlen); + osDelay(2); + } +``` +这是串口接收函数，没有接收到数据时在while中死循环阻塞，收到数据且断帧达到UART_TIMEOUT_MS后返回接收长度 +```c +uint16_t uart1_recv(uint8_t *buf,uint16_t len) +{ + uint16_t rxlen=0; + uint16_t ret=0; + while(len-rxlen>0){ + ret=hi_uart_read_timeout(HI_UART_IDX_1, buf+rxlen, len-rxlen,UART_TIMEOUT_MS); + if(ret==0&&rxlen!=0){ + return rxlen; + } + else{ + rxlen+=ret; + } + } + return rxlen; +} +``` + + +## 编译调试 + +### 修改 BUILD.gn 文件 + + +修改 `applications\BearPi\BearPi-HM_Nano\sample` 路径下 BUILD.gn 文件，指定 `uart_example` 参与编译。 + +```r +#"B1_basic_led_blink:led_example", +#"B2_basic_button:button_example", +#"B3_basic_pwm_led:pwm_example", +#"B4_basic_adc:adc_example", +#"B5_basic_i2c_nfc:i2c_example", +#"B6_basic_uart:uart_example", +"B7_basic_uart_2:uart_example2", +``` + + +### 运行结果 + +示例代码编译烧录代码后，按下开发板的RESET按键， `将开发板上E53接口的UART_TX和UART_RX用杜邦线接到TTL转USB模块（自备）` 通过串口助手查看数据，串口1实现接收回显。 + diff --git a/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/uart_example2.c b/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/uart_example2.c new file mode 100755 index 000000000..a99713872 --- /dev/null +++ b/applications/BearPi/BearPi-HM_Nano/sample/B7_basic_uart_2/uart_example2.c @@ -0,0 +1,109 @@ +/* + * Copyright (c) 2020 Nanjing Xiaoxiongpai Intelligent Technology Co., Ltd. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include +#include +#include + +#include "ohos_init.h" +#include "cmsis_os2.h" +#include "hi_uart.h" +#include "hi_io.h" + +#define UART_BUFF_SIZE 1024 //接收缓冲大小 +#define UART_TIMEOUT_MS 20 //接收超时时间 + +void uart1_send(uint8_t *buf,uint16_t len) +{ + hi_uart_write(HI_UART_IDX_1, (unsigned char *)buf, len); +} + +void uart1_rxproc(uint8_t *buf,uint16_t len) +{ + uart1_send((unsigned char *)buf, len); + printf("Uart1 read data len:%d\r\n", len); +} + + +//串口接收，无数据时阻塞，有数据时收完一帧或者收到最大值返回 +uint16_t uart1_recv(uint8_t *buf,uint16_t len) +{ + uint16_t rxlen=0; + uint16_t ret=0; + while(len-rxlen>0){ + ret=hi_uart_read_timeout(HI_UART_IDX_1, buf+rxlen, len-rxlen,UART_TIMEOUT_MS); + if(ret==0&&rxlen!=0){ + return rxlen; + } + else{ + rxlen+=ret; + } + } + return rxlen; +} + +void uart_task(void) +{ + uint8_t uart_buff[UART_BUFF_SIZE] = {0}; + uint8_t *uart_buff_ptr = uart_buff; + uint32_t ret; + uint16_t rxlen; + + hi_uart_attribute uart_attr = { + .baud_rate = 115200, + .data_bits = 8, + .stop_bits = 1, + .parity = 0, + }; + + //Initialize uart driver + ret = hi_uart_init(HI_UART_IDX_1, &uart_attr, NULL); + if (ret != HI_ERR_SUCCESS) + { + printf("Failed to init uart! Err code = %d\n", ret); + return; + } + printf("UART Test Start\n"); + + while (1) + { + //阻塞等待串口1数据 + rxlen=uart1_recv(uart_buff_ptr, UART_BUFF_SIZE); + //处理数据 + uart1_rxproc(uart_buff_ptr,rxlen); + osDelay(2); + } +} + +static void UART_ExampleEntry(void) +{ + + osThreadAttr_t attr; + + attr.name = "UART_Task"; + attr.attr_bits = 0U; + attr.cb_mem = NULL; + attr.cb_size = 0U; + attr.stack_mem = NULL; + attr.stack_size = 2048; + attr.priority = 15; + + if (osThreadNew((osThreadFunc_t)uart_task, NULL, &attr) == NULL) + { + printf("[Uart Example2] Falied to create UART_Task!\n"); + } +} + +APP_FEATURE_INIT(UART_ExampleEntry); \ No newline at end of file -- Gitee