USB to SPI adapters with straightforward API and many easy-to-use applications

Configurable SPI bus frequency 2kHz-48MHz

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.

Configurable SPI mode (clock polarity and phase)

SPI specification defines 4 modes of data transmission. They are composed by combination of clock polarity (CPOL) and clock phase (CPHA) parameters. DLN SPI-USB adapters support all 4 modes.

Half-duplex & full-duplex data transactions

Diolan SPI to USB adapter can transmit data to an external SPI device, from an external SPI device or in both directions simultaneously.

SPI slave reselection between data frames

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.

Configurable frame size 8-16 bits

The DLN adapter transmits the data bit after bit via SPI bus. Logically, your application and an SPI slave device treat this data as an array of 8-bit or 16-bit words within single USB frame. Some SPI slave devices (for example, digital-to-analog or analog-to-digital converters) operate even with 12-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.

SPI bus voltage 3.3V (5V tolerant)

The SPI bus voltage can be supplied either by DLN USB-SPI adapter, or by your hardware. The DLN adapters can supply 3.3V, but DLN-1 and DLN-2 adapters are 5V tolerant, so you can use them in 5V SPI circuits.

USB bus powered. Provide up to 350 mA of power to your embedded project.

The DLN USB-SPI adapters are powered directly from USB. No external power supplies are required. The USB to SPI adapters can also supply power for your hardware. The amount depends on specific device (see comparison table).

SPI Multi-Master

DLN SPI to USB adapters can share the bus with another SPI master device. This is important for rapid testing and debugging of closed SPI system.

Connect multiple SPI slaves. Up to 5 slave select pins are available

The exact quantity of available SS pins depends on specific adapter (see comparison table).

Additional API for SPI flash interface

It is supported only by DLN-4M and DLN-4S adapters.

ID and serial numbers are accessible from software.

Need to interface separate SPI busses simultaneously? You can connect several USB to SPI adapters to the same PC and interface them from the same software. 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.

Asynchronous and event driven SPI slave interface

DLN-4S adapter provide event-driven interface for SPI slave devices. 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.

Upgrades are free and can be easily applied.

We are constantly working to add new features to our USB-SPI adapters. The upgrade can be applied without disconnecting the USB-SPI adapter from PC. You can use our firmware update utility (open source) or integrate upgrade into your setup.

The USB to SPI adapters come with a set of easy to use software applications. For SPI interface we provide the following programs:

These applications are free and open source code. You can use them as a starting point for your own software development.

After installing our setup package you’ll get access to dozens open source demos in different programming languages, varying from the simplest to the most advanced.

If you need additional demo or instructions on how to interface DLN USB to SPI adapters from your favorite programming language just contact us. Our engineers and support team will be happy to assist you.

With just a few lines of code you can interface SPI bus from computer.

#include "..\..\..\common\dln_generic.h"
#include "..\..\..\common\dln_spi_master.h"
#pragma comment(lib, "..\\..\\..\\bin\\dln.lib")

int main()
{
	// Open device
	HDLN device;
	DlnOpenUsbDevice(&device);

	// Set SPI frequency
	uint32_t frequency;
	DlnSpiMasterSetFrequency(device, 0, 100000, &frequency);

	// Enable SPI master
	uint16_t conflict;
	DlnSpiMasterEnable(device, 0, &conflict);

	// Prepare output buffer
	uint8_t input[10], output[10];
	for (int i = 0; i < 10; i++) output[i] = i;

	// Perform SPI transaction
	DlnSpiMasterReadWrite(device, 0, 10, output, input);

	// Print received data
	for (int i = 0; i < 10; i++) printf("%02x ", input[i]);

	// Disable SPI and close device
	DlnSpiMasterDisable(device, 0, 0);
	DlnCloseHandle(device);

	return 0;
}
            

Additional Interfaces

Test Drive is a unique program offered by Diolan to assist you in evaluating and selecting the best interface adapter for your task. You will have 45-days risk free experience.

If the adapter does not satisfy your requirements, you can either return it back or exchange it to another adapter. The difference in price will be refunded.