SPI Serial Peripheral Interface is an interface bus commonly used for communication with flash memory, sensors, real-time clocks RTCsanalog-to-digital converters, and more. The Serial Peripheral Interface SPI bus was developed by Motorola to provide full-duplex synchronous serial communication between master and slave devices. Figure 1. The SPI interface defines no protocol for data exchange, limiting overhead and allowing for high speed data streaming.
Mode 0 is by far the most common mode for SPI bus slave communication. Table 1 below summarizes the available modes. Transactions are half-duplex to allow for bidirectional communication.
Reducing the number of data lines and operating in half-duplex mode also decreases maximum possible throughput; many 3-wire devices have low performance requirements and are instead designed with low pin count in mind. Figure 3. This performance increase enables random access and direct program execution from flash memory execute-in-place.
Figure 4 shows an example of a single quad IO slave configuration. Figure 4. The SPI protocol does not define the structure of the data stream; the composition of data is completely up to the component designer. However, many devices follow the same basic format for sending and receiving data, allowing interoperability between parts from different vendors. The Debugger module command script interface depicted in Figure 5 supports a simple command language for communication with SPI slave devices.
Figure 5. SPI Exerciser Debugger command script interface. In practical use, this is only required for grouping multiple commands into a single continuous transaction. Most SPI flash memories have a write status register command that writes one or two bytes of data, as shown in Figure 6.
To write to the status register, the SPI host first enables the slave select line for the current device. The master then outputs the appropriate instruction followed by two data bytes that define the intended status register contents.
Since the transaction does not need to return any data, the slave device keeps the MISO line in a high impedance state and the master masks any incoming data.
Finally, slave select is de-asserted to complete the transaction.This section describes the key features of SPI peripheral adapters as well as the procedure to enable and correctly configure the peripheral adapters for the SPI functionality. These files contain the APIs and macros for configuring the majority of the available peripheral hardware blocks.
In particular, this tutorial focuses on the adapters that are responsible for the SPI peripheral hardware block. Table 1 briefly explains the header files related to SPI adapters red indicates the path under which the files are stored while green indicates which ones are used for SPI operations. Therefore, if a DMA channel is not needed a value equal to -1 should be declared.
Thus, RX channel must always be set to an even number 0, 2, 4, 6.
When the system enters sleep it loses its pin configurations. Thus, it is essential for the pins to be reconfigured to their last state as soon as the system wakes up. Before using the SPI interface, the application task must open the device that will access the bus. Opening a device, involves enabling the SPI controller.
The function returns a handler to the main flow for use in subsequent adapter functions. Subsequent calls from other tasks simply return the already existing handler. This function should be called when the application task wants to communicate to the SPI bus directly using low level drivers. The function can be called several times. After all user operations are done and the device is no longer needed, it should be closed by the task that has currently acquired it.
The application can then switch to other devices connected on the same SPI bus. Remember that the SPI adapter implementation follows a single device scheme, that is only one device can be opened at a time.
The mechanism initially waits for the SPI bus to become available and then blocks the calling task until a transaction is completed. The above code performs a write transaction followed by a read transfer.
Serial Peripheral Interface
First, the chip select line is activated for the slave device and then data is sent over the SPI bus. When the current transaction is finished, the device changes to read mode and reads data from the connected device. Finally, the chip select line is deactivated when the transaction has finished. The aforementioned API can also be used for write only or read only transactions by providing a NULL pointer in the corresponding input parameter.
In asynchronous mode, the calling task is not blocked by the write or read operation. It can continue with other operations while waiting for a dedicated callback function to be called, signaling the completion of the read or write transaction.
SPI adapters allow developer to perform SPI transactions that consist of a number of reads, writes, and callback calls. This provides a time-efficient way to manage all SPI related actions. Most of the actions are executed within ISR context. There are a number of arguments-actions that should be used to perform various SPI transaction schemes.Serial Peripheral Interface SPI bus applications can be deceivingly complex due an ever -growing number of modes and increasing performance requirements.
New serial bus designs require debug equipment with multi-IO support and high speed capabilities at an affordable price. The Debugger module features a command script interface with individual tabs for maintaining multiple command sessions. The transaction log maintains a list of all activity performed by the BusPro-S.
The debugger interface features easy access to both standard and enhanced modes for maximum flexibility when debugging complex systems. The Programmer module features a library of common Flash and EEPROM device models for fast, convenient in-system erase, program, verify, and read operations for both standard and multi-IO components.
All major host functions are available through the API for convenient integration into third party applications and for use with popular lab and test executive software suites. Save time and effort at the repair station by visually identifying probable fault. Decrease expertise requirements with easy-to-read, graphical fault indicators based on advanced boundary-scan diagnostics. If you would like assistance with implementing JTAG testing in your design, or you are simply short of resources, our talented and experienced engineering staff can help you with all your JTAG needs.
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Search for:. Free Education and Training. June 5, by. Four IO modes including standard, 3-wire, dual, and quad. Selectable interface voltage of 1. Configurable bit order, slave select polarity, and SPI mode.
Eight independent slave select signals for designs with multiple slave devices. Powerful debugger with command script editor. Detailed transaction log with time stamp and data recording.
High-speed USB 2. Robust and portable bus-powered USB device, no external power supply required. Royalty-free software application programming interface API. BusPro-S Pin Assignments. BusPro-S Hardware Specifications.
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Typical Applications: - SPI device or chip control and debugging. Performance: - USB 2. Skip to main content. You can return the item for any reason in new and unused condition and get a full refund: no shipping charges Learn more about free returns.
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The interface was developed by Motorola in the mids and has become a de facto standard. Typical applications include Secure Digital cards and liquid crystal displays. SPI devices communicate in full duplex mode using a master-slave architecture with a single master.
The master device originates the frame for reading and writing. Multiple slave-devices are supported through selection with individual slave select SSsometimes called chip select CSlines. Sometimes SPI is called a four-wire serial bus, contrasting with three-two-and one-wire serial buses.
The SPI may be accurately described as a synchronous serial interface,  but it is different from the Synchronous Serial Interface SSI protocol, which is also a four-wire synchronous serial communication protocol. The SSI protocol employs differential signaling and provides only a single simplex communication channel.
SPI is one master and multi slave communication. While the above pin names are the most popular, in the past alternative pin-naming conventions were sometimes used, and so SPI port pin-names for older IC products may differ from those depicted in these illustrations:. Slave Select is the same functionality as chip select and is used instead of an addressing concept.
If a single slave device is used, the SS pin may be fixed to logic low if the slave permits it. Some slaves require a falling edge of the chip select signal to initiate an action. With multiple slave devices, an independent SS signal is required from the master for each slave device.
Most slave devices have tri-state outputs so their MISO signal becomes high impedance electrically disconnected when the device is not selected. Devices without tri-state outputs cannot share SPI bus segments with other devices without using an external tri-state buffer.
To begin communication, the bus master configures the clock, using a frequency supported by the slave device, typically up to a few MHz. The master then selects the slave device with a logic level 0 on the select line. If a waiting period is required, such as for an analog-to-digital conversion, the master must wait for at least that period of time before issuing clock cycles.
You can connect adapter to any SPI device and adjust the frequency to reach the maximum throughput. The SPI bus frequency is configured with a single function call. SPI specification defines 4 modes of data transmission. Some SPI slave devices require additional time to process data. You can configure delays at different data transmission stages to fulfill the slave device requirements:.
USB to SPI adapters with straightforward API and many easy-to-use applications
Every SPI transmission starts with selecting the slave device. Some SPI slave devices are able to receive large data packages during a single transaction, while others require slave select line to be reasserted for each byte or word of data data frame. You can configure the size of data frame and instruct DLN series adapter to reassert slave select pin between frames.
Logically, your application and an SPI slave device treat this data as an array of 8-bit or bit words within single USB frame. Some SPI slave devices for example, digital-to-analog or analog-to-digital converters operate even with bit words.
The ability to set any frame size in the available range allows the DLN adapters to support a wide range of SPI slave devices. The DLN adapters can supply 3. No external power supplies are required. The amount depends on specific device see comparison table. This is important for rapid testing and debugging of closed SPI system. The exact quantity of available SS pins depends on specific adapter see comparison table.
Need to interface separate SPI busses simultaneously? Every adapter is uniquely identified by serial number, assigned during the manufacturing.
You can change the ID number from software to prepare similar fixtures with multiple adapters in each fixture. The events are generated when the SPI slave meets the certain predefined conditions.
You can preconfigure the SPI adapter to send events after transaction. Polling, that wastes computer resources and bus bandwidth, is not required.Need to change Protocol? Don't change the Analyzer! Use a single debug tool for all your embedded systems. S tate-of-the-art hardware. Integrated level shifting. All protocols are software driven and share the same platform.
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Specifications and comparison. Protocols Supported. Master Clock Speed. Slave Lcock Speed. Real-time Bus Monitor. Monitor 2 alerts, 2 resets, 2 chip. Slave Capability. Voltage Levels V 1. Target Power V.