The axi spi ip core is a fullduplex synchronous channel that supports a fourwire interface receive, transmit. How can i write an spi driver for zynq 7000 arm development. Note this example works only with 8bit wide data transfers in standard spi mode. The devicetree generator for the edk does not create the eeprom device on the spi bus. Product specification introduction the logicore ip axi quad serial peripheral interface spi core connects the axi4 interface to those spi slave devices that support the standard, dual, or quad spi protocol instruction set. The following example shows adding an spi eeprom to a device tree. This example works only with 8bit wide data transfers. This page provides information about the zynqzynqmp spi driver which can be found on xilinx git and mainline as spi cadence. The hardware which this example runs on must have a serial eeprom microchip 25xx320 or 25xx160 for it to run. This example erases a sector, writes to a page within the sector, reads back. Controlling a spi device using the zynq spi controller. If the spi driver is used in polled mode the user has to disable the global interrupts after this function is called. It is basically a masterslave relationship that exists here. This file contains a design example using the spi driver and hardware device with an stm serial flash device m25p series in the interrupt mode.
This example has been tested with aardvark i2c spi host adapter, an off board external spi master device and the xilinx spi device configured as a slave. This file contains a design example using the spi driver and hardware device with a serial eeprom device. The xps serial peripheral interface spi connects to the plb processor local bus and provides a serial interface to spi devices such as spi eeproms. In this tutorial, well do things the official way, and use the one of the hard ip spi controllers present on the zynq chip. The value of 0 in the reg entry is the chip select for the eeprom.
Xilinx ds742 logicore ip axi serial peripheral interface. The external spi devices that are present on the xilinx boards dont support the master functionality. This is available as a pdf from the programming guides page of the documents section or from the ftdi knowledgebase. Hi, these are general fpga linux question, you should better seek for help on the xilinx user forums. This example was used to access an spi eeprom on the aardvark board. Navigate to device driversspi support and make sure that cadence spi controller, xilinx spi controller command module, xilinx zynq qspi controller, and. Spi serial peripheral interface masterslave the cc spi axi is a synthesisable verilog model of a spi serial peripheral interface masterslave controller.
The lsb first data format is not available in all versions of the xilinx spi device whereas the msb first data format is supported by all the versions of the xilinx spi devices. I want to configure the microblaze as spi slave, for plain old 4wire spi with 1 data line per direction, talking to an externally connected master cpu, based on interrupt, with 32bits width. Note this example works only with 8bit wide data transfers in standard spi. We would like to show you a description here but the site wont allow us. Join date aug 20 posts 186 helped 0 0 points 2,075 level 10.
Add a qspi driver for zynq platforms aug 2 2018, 10. As an example, this core provides a serial interface to spi slave devices such as spi serial flash from winbondnumonyx which support dual and quad spi. Coding axi quad spi community forums xilinx forums. In the example above, spi 0 in the zynq mpsoc ps is available for use with both slave select zero and one. Some minor properties in the cadence ip offer multiple options which were customized as desirable. This is built on top of cadence spi with support for qspi flash devices, linear read and single, parallel and stacked flash configurations. I think, the simpliest way is use a spidev driver, as there is already an example in kernel. The devicetree generator for the edk does not create the eeprom. This file contains a design example using the spi driver and the spi device as a slave, in polled mode.
A particular spi protocol consists of microcontroller as master and another microcontroller or ic as a slave. A simple loopback test is done within an spi device in polled mode. The driver is pretty xilinx specific although its probably a synopsys designware core. Im going to write an spi driver for an arm devlopment board. The spi core can be efficiently implemented on fpga and asic technologies. Go through bsb for the ml403 board and it will give you an example of the ports for spi that are external and how they are declared in the ucf file. This file contains a design example using the lowlevel driver of the spi driver. Example usage files for each driver can be found in the drivers directory in the. The following kernel output or similar shows the eeprom driver was started. This example shows the usage of the spi driver and the spi device as a slave, in polled mode. This example has been tested for bytewide spi transfers.
Spi srec bootloader example design for the arty evaluation. In this design the xilinx sdk spi srec bootloader application will be used to fetch this gpio demo software application from qspi memory on the arty board and begin execution. In addition, the example design provided in this guide is available in both verilog and vhdl. This core provides a serial interface to spi slave devices. The value in the spi maxfrequency is the bus frequency. Please check the above examples present for quad spi. Enabling spi in the ps mpsoc example once we have the hardware built, we are then able to export a hardware definition file hdf and use this to create a petalinux project. Xilinx pg153 logicore ip axi quad serial peripheral.
Each master has 4 wire lines at least to communicate with a single slave. Initial configuration screen select device drivers. This page provides information about the zynqzynqmp spi driver. Make sure the axixps spi driver is enabled, if not enable it during kernel config and rebuild the kernel. However before we build the project, if we want to us the spi from the user space, we need to make a few modifications to the petalinux kernel and device tree. Have you taken a look at the example code provided with the spips driver under sdk. Maximum spi clock sck frequency is 112mhz, which is derived from main clock. This page provides information about the zynq qspi driver which can be found on xilinx git as spi zynqqspi.
Once you have added either the ps based or axi based spi interface to your zynq design and exported it to the sdk software developement kit you can open the system. In tutorial 24, i covered controlling a spi device by just taking control of the memory mapped gpio and bitbanging the spi without a driver. There is a way of using the spi kernel driver to work as a device in the userspace. This example shows the usage of the spi driver and the spi. Again, spi is very different from quad spi and you can often find hardware implementations that make it very easy to use qspi. Spi basic tutorial if you look at the top of the mhs file you will see all of the external ports. A programmers guide has been created for the ftcjtag dll. There is one example file which sets things up for slaveinterrupt mode, but alas, it only shows how to register a status handler and receive data from. This file contains a design example using the spi driver xspi and hardware device with an intel serial flash memory s33 in the interrupt mode. This page provides information about the zynqmp qspi driver which can be found on xilinx git as spi zynqmpgqspi. For standard spi mode instructions, the io0 and io1 pins are unidirectional the same as the mosi and miso pins. The spi protocol, as described in the motorola m68hc11 data sheet, provides a simple method for a master and a selected slave to exchange data.
Contains an example on how to use the xspi driver directly. This example shows the usage of the spi driver and the spi device as a slave, in interrupt mode. Overview the behavior of the ports in dual mode is. A perfect example of this is the software required for the leds and switches gpio demo described above. The relationship of spi can have multimaster and slaves too. This example has been tested with the spi eeprom on the ml410 platform for ppc processor. The ftcjtag dll has been enhanced to accommodate the ft4232h and ft2232h devices in addition to the ft2232 version 2.