The devicetree generator for the edk does not create the eeprom device on the spi bus. Im going to write an spi driver for an arm devlopment board. Some minor properties in the cadence ip offer multiple options which were customized as desirable. 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. This example shows the usage of the spi driver and the spi device as a slave, in polled mode. This file contains a design example using the lowlevel driver of the spi driver. Controlling a spi device using the zynq spi controller. Overview the behavior of the ports in dual mode is. If the spi driver is used in polled mode the user has to disable the global interrupts after this function is called.
The hardware which this example runs on must have a serial eeprom microchip 25xx320 or 25xx160 for it to run. Initial configuration screen select device drivers. Note this example works only with 8bit wide data transfers in standard spi. Coding axi quad spi community forums xilinx forums. It is basically a masterslave relationship that exists here.
A simple loopback test is done within an spi device in polled mode. Navigate to device driversspi support and make sure that cadence spi controller, xilinx spi controller command module, xilinx zynq qspi controller, and. Join date aug 20 posts 186 helped 0 0 points 2,075 level 10. The driver is pretty xilinx specific although its probably a synopsys designware core. Make sure the axixps spi driver is enabled, if not enable it during kernel config and rebuild the kernel. Spi serial peripheral interface masterslave the cc spi axi is a synthesisable verilog model of a spi serial peripheral interface masterslave controller. This page provides information about the zynqmp qspi driver which can be found on xilinx git as spi zynqmpgqspi. Logicore ip xps serial peripheral interface spi v2. The following kernel output or similar shows the eeprom driver was started.
This example works only with 8bit wide data transfers. 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 was used to access an spi eeprom on the aardvark board. This is available as a pdf from the programming guides page of the documents section or from the ftdi knowledgebase. Please check the above examples present for quad spi. The external spi devices that are present on the xilinx boards dont support the master functionality.
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. We would like to show you a description here but the site wont allow us. The spi core can be efficiently implemented on fpga and asic technologies. 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 tutorial 24, i covered controlling a spi device by just taking control of the memory mapped gpio and bitbanging the spi without a driver. This file contains a design example using the spi driver and hardware device with a serial eeprom device. 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. The relationship of spi can have multimaster and slaves too. The following example shows adding an spi eeprom to a device tree. 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. This example has been tested for bytewide spi transfers. Again, spi is very different from quad spi and you can often find hardware implementations that make it very easy to use qspi. This page provides information about the zynqzynqmp spi driver. Yesterday, i read the qspi driver that xilinx provided and i tried it successfully.
This page provides information about the zynq qspi driver which can be found on xilinx git as spi zynqqspi. In this tutorial, well do things the official way, and use the one of the hard ip spi controllers present on the zynq chip. 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. Note this example works only with 8bit wide data transfers in standard spi mode. This example erases a sector, writes to a page within the sector, reads back. Example usage files for each driver can be found in the drivers directory in the. This example has been tested with the spi eeprom on the ml410 platform for ppc processor. There is a way of using the spi kernel driver to work as a device in the userspace.
Xilinx pg153 logicore ip axi quad serial peripheral. 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. 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 example shows the usage of the spi driver and the spi. In the example above, spi 0 in the zynq mpsoc ps is available for use with both slave select zero and one. The devicetree generator for the edk does not create the eeprom. The value of 0 in the reg entry is the chip select for the eeprom. A perfect example of this is the software required for the leds and switches gpio demo described above.
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. How can i write an spi driver for zynq 7000 arm development. This example shows the usage of the spi driver and the spi device as a slave, in interrupt mode. This core provides a serial interface to spi slave devices. Hi, these are general fpga linux question, you should better seek for help on the xilinx user forums. 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. Spi basic tutorial if you look at the top of the mhs file you will see all of the external ports.
Each master has 4 wire lines at least to communicate with a single slave. 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. 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. Have you taken a look at the example code provided with the spips driver under sdk. This file contains a design example using the spi driver and the spi device as a slave, in polled mode. Add a qspi driver for zynq platforms aug 2 2018, 10. The value in the spi maxfrequency is the bus frequency. For standard spi mode instructions, the io0 and io1 pins are unidirectional the same as the mosi and miso pins. This page provides information about the zynqzynqmp spi driver which can be found on xilinx git and mainline as spi cadence. Spi srec bootloader example design for the arty evaluation. In addition, the example design provided in this guide is available in both verilog and vhdl.