初步实现 LoRa 模块的发送和接收

Hardware/lora/README.md

@@ -0,0 +1,7 @@
+## LoRa-02 
+
+基于 [wdomski/SX1278](https://github.com/wdomski/SX1278) 库封装的简单的 LoRa 模块操作库。
+
+由于实验板在设计时忽略了 DIO0 引脚的引出，导致无法使用 DIO0 上的接收、发送中断。因此，对 wdomski/SX1278 库进行了修改，采用检测 FifoRxCurrentaddr 是否移动的方法判断是否有新的接收。在发送时不检测发送中断。
+
+本实现采用了手册上未定义的方法，可能出现各种问题，建议在可能的情况下引出 DIO0 使用。

Hardware/lora/lora.c

@@ -0,0 +1,163 @@
+/**
+ * @file    lora.c
+ * @author  Myth
+ * @version 0.1
+ * @date    2021.10.15
+ * @brief   LoRa sx1278 Library for STM32 HAL
+ */
+
+#include "softspi.h"
+#include "SX1278.h"
+
+#include "lora.h"
+
+SX1278_hw_t SX1278_hw;
+SX1278_t SX1278;
+SoftSPI_TypeDef sx1278_spi;
+
+uint8_t is_in_rx_mode = 0;
+
+uint8_t LoRa_EnterTxMode(uint8_t len);
+uint8_t LoRa_EnterRxMode(void);
+
+/**
+ * @brief  LoRa 模块初始化
+ */
+void LoRa_Init(void)
+{
+    //初始化各个引脚
+    sx1278_spi.SCLK_GPIO = SX1278_SCLK_GPIO;
+    sx1278_spi.SCLK_Pin = SX1278_SCLK_PIN;
+
+    sx1278_spi.MOSI_GPIO = SX1278_MOSI_GPIO;
+    sx1278_spi.MOSI_Pin = SX1278_MOSI_PIN;
+
+    sx1278_spi.MISO_GPIO = SX1278_MISO_GPIO;
+    sx1278_spi.MISO_Pin = SX1278_MISO_PIN;
+
+    sx1278_spi.SS_GPIO = SX1278_SS_GPIO;
+    sx1278_spi.SS_Pin = SX1278_SS_PIN;
+
+    sx1278_spi.Delay_Time = 5;
+
+    SX1278_hw.nss.port = GPIOA;
+    SX1278_hw.nss.pin = GPIO_PIN_6;
+    SX1278_hw.reset.port = GPIOA;
+    SX1278_hw.reset.pin = GPIO_PIN_7;
+    SX1278_hw.spi = &sx1278_spi;
+
+    SX1278.hw = &SX1278_hw;
+
+    SoftSPI_Init(&sx1278_spi);
+
+    switch ((uint32_t)(SX1278_RESET_GPIO))
+    {
+    case (uint32_t)GPIOA:
+    {
+        GPIO_InitTypeDef GPIO_Initure;
+        __HAL_RCC_GPIOA_CLK_ENABLE();
+
+        GPIO_Initure.Pin = SX1278_RESET_PIN;
+        GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
+        GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
+        HAL_GPIO_Init(GPIOA, &GPIO_Initure);
+    }
+    break;
+
+    case (uint32_t)GPIOB:
+    {
+        GPIO_InitTypeDef GPIO_Initure;
+        __HAL_RCC_GPIOB_CLK_ENABLE();
+
+        GPIO_Initure.Pin = SX1278_RESET_PIN;
+        GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
+        GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
+        HAL_GPIO_Init(GPIOB, &GPIO_Initure);
+    }
+    break;
+
+    case (uint32_t)GPIOC:
+    {
+        GPIO_InitTypeDef GPIO_Initure;
+        __HAL_RCC_GPIOC_CLK_ENABLE();
+
+        GPIO_Initure.Pin = SX1278_RESET_PIN;
+        GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
+        GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
+        HAL_GPIO_Init(GPIOC, &GPIO_Initure);
+    }
+    break;
+
+    case (uint32_t)GPIOD:
+    {
+        GPIO_InitTypeDef GPIO_Initure;
+        __HAL_RCC_GPIOD_CLK_ENABLE();
+
+        GPIO_Initure.Pin = SX1278_RESET_PIN;
+        GPIO_Initure.Mode = GPIO_MODE_OUTPUT_PP;
+        GPIO_Initure.Speed = GPIO_SPEED_FREQ_HIGH;
+        HAL_GPIO_Init(GPIOD, &GPIO_Initure);
+    }
+    }
+
+    SX1278_init(
+        &SX1278,
+        434000000,
+        SX1278_POWER_17DBM,
+        SX1278_LORA_SF_7,
+        SX1278_LORA_BW_125KHZ,
+        SX1278_LORA_CR_4_5,
+        SX1278_LORA_CRC_EN,
+        255);
+}
+
+uint8_t LoRa_EnterTxMode(uint8_t len)
+{
+    is_in_rx_mode = 0;
+    return SX1278_LoRaEntryTx(&SX1278, len, 1000);
+}
+
+uint8_t LoRa_EnterRxMode(void)
+{
+    if (is_in_rx_mode)
+        return 1;
+
+    if (SX1278_LoRaEntryRx(&SX1278, 255, 1000))
+        is_in_rx_mode = 1;
+
+    return is_in_rx_mode;
+}
+
+/**
+ * @brief  LoRa 模块发送
+ * @param  pdata
+ * @param  len
+ * @retval 发送成功返回 1，发送失败返回 0
+ */
+uint8_t LoRa_Send(uint8_t *pdata, uint8_t len)
+{
+    if (LoRa_EnterTxMode(len) == 0)
+        return 0;
+
+    SX1278_LoRaTxPacket(&SX1278, pdata, len, 1000); //超时时间无意义，此函数立即返回
+    return 1;
+}
+
+/**
+ * @brief  LoRa 模块接收
+ * @param  pdata
+ * @retval 接收到包的长度，0 表示未收到数据
+ */
+uint8_t LoRa_Receive(uint8_t *pdata)
+{
+    if (LoRa_EnterRxMode() == 0)
+        return 0;
+
+    uint8_t len = SX1278_LoRaRxPacket(&SX1278);
+
+    if (len == 0)
+        return 0;
+
+    SX1278_read(&SX1278, pdata, len);
+    return len;
+}

Hardware/lora/lora.h

@@ -0,0 +1,35 @@
+/**
+ * @file    lora.h
+ * @author  Myth
+ * @version 0.1
+ * @date    2021.10.15
+ * @brief   LoRa sx1278 Library for STM32 HAL
+ * @note    DO NOT USE THIS LIB IF YOU HAVE DIO0
+ */
+
+#ifndef __LORA_H
+#define __LORA_H
+
+#include "sys.h"
+
+// SX1278 引脚设置
+#define SX1278_SCLK_GPIO GPIOA
+#define SX1278_SCLK_PIN GPIO_PIN_3
+
+#define SX1278_MOSI_GPIO GPIOA
+#define SX1278_MOSI_PIN GPIO_PIN_5
+
+#define SX1278_MISO_GPIO GPIOA
+#define SX1278_MISO_PIN GPIO_PIN_4
+
+#define SX1278_SS_GPIO GPIOA
+#define SX1278_SS_PIN GPIO_PIN_6
+
+#define SX1278_RESET_GPIO GPIOA
+#define SX1278_RESET_PIN GPIO_PIN_7
+
+void LoRa_Init(void);
+uint8_t LoRa_Send(uint8_t *pdata, uint8_t len);
+uint8_t LoRa_Receive(uint8_t *pdata);
+
+#endif

Libraries/SX1278

@@ -1 +1 @@
-Subproject commit d6d89363cef5642de8265371f15a1bdf47f3581e
+Subproject commit a7a42360525ea26f45b459f37c06580706f030b6

Libraries/SoftSPI_HAL_Lib

@@ -1 +1 @@
-Subproject commit e129b212f50433714371eb2460308c1440a8eb97
+Subproject commit b56448d008643005da02162361fa17fd162f279a

Project/SlaveNode.uvprojx

@@ -339,7 +339,7 @@
               <MiscControls></MiscControls>
               <Define>USE_HAL_DRIVER, STM32F103x6</Define>
               <Undefine></Undefine>
-              <IncludePath>..\Core;..\Libraries\HAL_Lib\Inc;..\Libraries\SoftSPI_HAL_Lib;..\Libraries\SoftI2C_HAL_Lib;..\User\Main;..\System\sys;..\System\systick;..\System\uart;..\Hardware\led;..\Hardware\aht20;..\Hardware\bh1750</IncludePath>
+              <IncludePath>..\Core;..\Libraries\HAL_Lib\Inc;..\Libraries\SoftSPI_HAL_Lib;..\Libraries\SoftI2C_HAL_Lib;..\Libraries\SX1278\driver;..\User\Main;..\System\sys;..\System\systick;..\System\uart;..\Hardware\led;..\Hardware\aht20;..\Hardware\bh1750;..\Hardware\lora</IncludePath>
             </VariousControls>
           </Cads>
           <Aads>
@@ -665,6 +665,21 @@
             </File>
           </Files>
         </Group>
+        <Group>
+          <GroupName>SX1278</GroupName>
+          <Files>
+            <File>
+              <FileName>SX1278.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\Libraries\SX1278\driver\SX1278.c</FilePath>
+            </File>
+            <File>
+              <FileName>SX1278_hw.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\Libraries\SX1278\driver\SX1278_hw.c</FilePath>
+            </File>
+          </Files>
+        </Group>
         <Group>
           <GroupName>System</GroupName>
           <Files>
@@ -703,6 +718,11 @@
               <FileType>1</FileType>
               <FilePath>..\Hardware\bh1750\bh1750.c</FilePath>
             </File>
+            <File>
+              <FileName>lora.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\Hardware\lora\lora.c</FilePath>
+            </File>
           </Files>
         </Group>
       </Groups>

User/Main/main.c

@@ -1,14 +1,13 @@
 /**
  * @file    main.c
  * @author  Myth
- * @version 0.7
+ * @version 0.8
  * @date    2021.10.15
  * @brief   工程主函数文件
  * @details 初始化及主循环
  * @note    此版本实现功能：
  *          串口回显，回显时 PC13 上的 LED 闪烁
- *          AHT20 温度湿度读取及 BH1750 光照度读取
+ *          接收来自主节点的字符串数据
- *          此版本 AHT20 和 BH1750 在两次读取期间关闭 GPIO 时钟以降低功耗。每一次读取结束后 LED 闪烁
  *          JTAG 已禁用，请使用 SWD 调试
  */
 
@@ -17,8 +16,7 @@
 #include "uart.h"
 
 #include "led.h"
-#include "aht20.h"
+#include "lora.h"
-#include "bh1750.h"
 
 void Echo(uint8_t byte);
 
@@ -34,37 +32,23 @@ int main(void)
     UART_Init();          //初始化串口
 
     LED_Init();  //初始化 LED
+    LoRa_Init(); //初始化 LoRa 模块
 
     UART_BindReceiveHandle(COM1, Echo); //绑定 COM1 串口接收中断至 Echo 函数
 
-    AHT20_Init(); //初始化 AHT20
+    uint8_t buffer[255];
-    float humi, temp;
+    uint8_t size;
-
-    BH1750_Init(); //初始化 BH1750
-    float light;
 
     while (1)
     {
         //程序主循环
-        __HAL_RCC_GPIOB_CLK_ENABLE(); //开启 GPIOB 时钟
+        size = LoRa_Receive(buffer); //接收
+        if (size == 0)
+            continue;
 
-        AHT20_Start();  // AHT20 开始测量
+        printf("Receive %d bytes: %s\n", size, buffer);
-        BH1750_Start(); // BH1750 开始测量
 
-        Delay_ms(80);
-
-        AHT20_Read(&humi, &temp); //读取 AHT20
-
-        Delay_ms(100);
-
-        light = BH1750_Read(); //读取 BH1750
-
-        printf("humi: %.1f    temp: %.1f    light: %.1f\n", humi, temp, light);
         LED1_Toggle;
-
-        __HAL_RCC_GPIOB_CLK_DISABLE(); //关闭 GPIOB 时钟以降低功耗
-
-        Delay_ms(500);
     }
 
     return 1;