STM32 dma SYNCHRONIZATION SIGAL
时间: 2023-09-28 22:03:59 浏览: 137
对于STM32系列的MCU,DMA(Direct Memory Access)是一种用于数据传输的高效机制。DMA允许外设直接与内存进行数据传输,而无需CPU的干预,从而提高系统的性能和效率。
在DMA传输中,同步信号(Synchronization Signal)用于控制数据的传输时机以及保证数据的完整性。同步信号可以是硬件触发信号,也可以是软件触发信号。
对于硬件触发信号,可以通过配置DMA的外设请求源来触发数据传输。外设通过发送一个触发信号告知DMA开始数据传输,例如外设的中断或者特定的寄存器状态改变等。
对于软件触发信号,可以通过CPU软件代码来触发数据传输。在某些情况下,需要手动触发DMA传输,例如在特定的时间点或者特定的条件满足时。
在STM32的DMA配置中,可以选择适当的同步信号源以满足具体应用需求。通常,同步信号的选择取决于外设和DMA通道之间的关系以及数据传输的时机要求。
需要注意的是,具体的DMA同步信号配置方法可能因不同的STM32系列和型号而有所差异。因此,在使用DMA进行数据传输时,建议查阅相关的STM32参考手册或者官方文档,以获取准确的配置信息和示例代码。
相关问题
Synchronization Signal Block
Synchronization Signal Block (SSB) 是5G新空口(NR)中用于同步和小区搜索的关键物理信道/信号。它包含了无线帧结构中的基本时间与频率信息,如时域上的位置(通过PSS和SSS)和频率上的位置(通过PBCH)。
**SSB组成**[^4]:
- **Primary Synchronization Sequence (PSS)**: 主同步序列,用于确定无线帧的开始时间和频率位置。
- **Secondary Synchronization Sequence (SSS)**: 次级同步序列,进一步细化帧的位置并帮助解调PSS。
**功能**[^4]:
- **时间同步**: SSB提供了一个精确的时间基准,使得设备能够准确地知道每个无线帧的起始时刻。
- **频率同步**: PSS和SSS共同确定了载波的频率。
- **小区搜索**: 用户设备可以利用SSB来识别不同的小区并获取广播消息,如Physical Broadcast Channel (PBCH),其中包含小区ID和其他重要配置信息。
在实际操作中,接收端会先捕获到SSB,然后基于这些信息去解调其他重要的通信信道。
stm32 modbus
STM32 is a family of microcontrollers developed by STMicroelectronics. These microcontrollers are widely used in industrial automation and control systems. Modbus is a communication protocol commonly used in industrial applications for transmitting data between electronic devices.
STM32 microcontrollers can be used to implement Modbus communication protocols. The STM32 family of microcontrollers provides a wide range of features that make it suitable for implementing Modbus communication protocols. These features include:
1. Built-in USARTs: STM32 microcontrollers come with built-in USARTs that can be used for serial communication. Modbus communication protocols use serial communication to transmit data between devices.
2. DMA: STM32 microcontrollers have built-in DMA controllers that can be used for efficient data transfer between memory and peripherals. DMA can be used to accelerate Modbus communication, especially when large amounts of data are being transferred.
3. Timers: STM32 microcontrollers have built-in timers that can be used for precise timing and synchronization of Modbus communication.
4. Interrupts: STM32 microcontrollers have built-in interrupt controllers that can be used for handling Modbus communication events.
5. Low-power modes: STM32 microcontrollers have low-power modes that can be used to reduce power consumption when the device is idle.
Overall, STM32 microcontrollers are well-suited for implementing Modbus communication protocols due to their built-in USARTs, DMA controllers, timers, interrupt controllers, and low-power modes. These features make it possible to implement efficient and reliable Modbus communication in industrial automation and control systems.