diff --git a/app/inc/hardware.h b/app/inc/hardware.h
index c677362..a925028 100644
--- a/app/inc/hardware.h
+++ b/app/inc/hardware.h
@@ -3,16 +3,21 @@
 
 /*接收数组大小*/
 #define MODBUS_RX_BUF_SIZE  256
+/*发送数组大小*/
+#define MODBUS_TX_BUF_SIZE  256
+
 /*modbus通信波特率*/
 #define MODBUS_USART_BAUDRATE 19200
 
 
 extern uint8_t ModbusRxBuf[MODBUS_RX_BUF_SIZE];
 extern uint16_t ModbusRxLen;
+extern uint8_t ModbusTxBuf[MODBUS_TX_BUF_SIZE];
+extern uint16_t ModbusTxLen;
 
 
 
-void MdobusHardwareInit(void);
+void ModbusHardwareInit(void);
 
 
 #endif
diff --git a/app/src/hardware.c b/app/src/hardware.c
index f6d61a2..ada84f8 100644
--- a/app/src/hardware.c
+++ b/app/src/hardware.c
@@ -1,10 +1,12 @@
 #include "stm32f4xx.h"
 #include "hardware.h"
 
-/*接收数组*/
-uint8_t ModbusRxBuf[MODBUS_RX_BUF_SIZE];
-/*接收数据长度*/
-uint16_t ModbusRxLen = 0;
+
+uint8_t ModbusRxBuf[MODBUS_RX_BUF_SIZE];    /*接收数组*/
+uint16_t ModbusRxLen = 0;                   /*接收数据长度*/
+uint8_t ModbusTxBuf[MODBUS_TX_BUF_SIZE];    /*发送数组*/
+uint16_t ModbusTxLen = 0;                   /*发送数据长度*/
+
 
 void ModbusGpioInit(void)
 {
@@ -15,7 +17,7 @@ void ModbusGpioInit(void)
     /* PA9->USART1_TX，PA10->USART1_RX */
     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
-    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
     GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;          /*推挽输出*/
     GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
     GPIO_Init(GPIOA, &GPIO_InitStructure);
@@ -58,7 +60,7 @@ void ModbusDmaInit(void)
     DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART1->DR);     /*设置DMA外设端地址为USART1数据寄存器地址*/
     DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ModbusRxBuf;          /*设置DMA存储器目标地址为接收缓冲区首地址*/
     DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;                 /*传输方向为外设->内存*/
-    DMA_InitStructure.DMA_BufferSize = MODBUS_RX_BUF_SIZE;                  /*传输最大字节数*/
+    DMA_InitStructure.DMA_BufferSize = MODBUS_RX_BUF_SIZE;                  /*传输字节数*/
     DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;        /*禁止外设地址递增*/
     DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                 /*使能内存地址自增*/
     DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; /*设置外设数据宽度为1字节（8位）*/
@@ -72,16 +74,27 @@ void ModbusDmaInit(void)
     DMA_Init(DMA2_Stream2, &DMA_InitStructure);
 
     /* DMA2_Stream7_Channel_4 用于 USART1_TX */
-    /*USART1_TX的其他配置在USART中断中配置*/
-    DMA_DeInit(DMA2_Stream7);                                                                                          
-    DMA_InitStructure.DMA_Channel = DMA_Channel_4;                          
+    DMA_DeInit(DMA2_Stream7);                           /*恢复默认状态*/
+    DMA_InitStructure.DMA_Channel = DMA_Channel_4;      /*配置通道4*/
     DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART1->DR);     /*设置DMA外设端地址为USART1数据寄存器地址*/
+    DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ModbusRxBuf;          /*设置DMA存储器目标地址*/
     DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;                 /*传输方向为内存->外设*/
+    DMA_InitStructure.DMA_BufferSize = MODBUS_RX_BUF_SIZE;                  /*设置传输字节数*/
+    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;        /*禁止外设地址递增*/
+    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;                 /*使能内存地址自增*/
+    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; /*设置外设数据宽度为1字节（8位）*/
+    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;         /*设置内存数据宽度为1字节（8位）*/
+    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;                           /*modbus帧长度不固定，无法使用循环模式，配置为普通模式，每次传输完软件重新使能*/
+    DMA_InitStructure.DMA_Priority = DMA_Priority_High;                     /*高优先级*/
+    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;                  /*不使用FIFO模式*/
+    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;   /*禁止FIFO后无用*/
+    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;             /*内存侧单次传输，每次搬运一个数据单位*/
+    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;     /*外设侧单次传输，每次搬运一个数据单位*/
     DMA_Init(DMA2_Stream7, &DMA_InitStructure);
 
     /* 使能USART的DMA请求 */
-    USART_DMACmd(USART1, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE);        /*使能USART1的RX、TX的DMA请求*/
-    DMA_Cmd(DMA2_Stream2, ENABLE);
+    USART_DMACmd(USART1, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE);        /*使能USART1的RX、Tx的DMA请求*/
+    DMA_Cmd(DMA2_Stream2, ENABLE);                                  /*使能DMA的接收通道，发送通道暂不使能*/
 }
 
 void ModbusNvicInit(void)
@@ -96,7 +109,7 @@ void ModbusNvicInit(void)
 }
 
 
-void MdobusHardwareInit(void)
+void ModbusHardwareInit(void)
 {
     /*NVIC分组配置*/
     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4); /*4位抢占优先级，0位子优先级*/