Howard Mao

[...] deal with discrete (binary) quantities and runs at a fixed clock rate. Therefore, we need an audio codec in order to convert between the analog signals coming from the microphone or going to the [...]

[...] In the last post, we looked at how to interface with the audio codec on the Cyclone V. Now, we will use the audio codec to implement a real-time audio filter. This [...]

[...] In September, I bought one of the new Arrow SoCKits. They are development boards for the Altera Cyclone V, a system-on-chip with an ARM processor and FPGA. Now that I’m out of school, I finally [...]

[...] Hi everyone! It’s been a long time, but here is another Cyclone V tutorial blog post. This time, we will look at how to send interrupts from the FPGA to the HPS [...]

[...] to make sure the computatation proceeds in the correct order. Implementing Memories The Cyclone V can efficiently implement small memories using on-chip block RAM. In order to generate [...]

[...] (there is no integer number N such that 50 / N is close enough to 11.2896). Fortunately, the Cyclone V contains specialty circuits called Phase-Locked Loops (PLLs) which can generate very precise [...]

[...] can automatically generate interconnect logic to hook up different hardware modules. Hardware descriptions and C code can be found on Github. A Brief Aside on Memory-Mapped IO Before we begin, [...]

[...] licensed and has been disabled”. If you do see warnings or errors, look back at your hardware descriptions and make sure there isn’t a typo. “Analysis and Synthesis” will be [...]

[...] to follow along, you will need speakers or headsets and a microphone. All of the hardware descriptions and other project files can be found on Github. An Introduction to Digital Audio [...]

[...] from the ADC, transform them, and output the transformed samples on the DAC. All of the hardware descriptions and software tools for this part can be found in the part 9 branch of the Github repo. To [...]

[...] at it if you’re interested in learning more. Setting up the Module When creating a Linux kernel module, we first need to register init and exit functions, which are run when the module is loaded [...]

[...] all, from hardware to software. In my next post, we’ll clean things up a bit and write a kernel module to handle the writes to the HPS-to-FPGA bridge. <- Part 2 Part 4 -> [...]

[...] V, FPGA interrupts start at IRQ number 72, so our interrupt 0 corresponds to IRQ 72. The Linux Kernel Module In order to be able to handle these interrupts in software, we need to write a linux kernel [...]

[...] also see no assertion failures or errors in the command window at the bottom. Verifying the MD5 Unit To verify our MD5 unit, we will use a similar technique as above. We put in some input, run the [...]

[...] different. We’ll want convenience functions for doing five key operations: resetting an MD5 unit, starting a unit, checking if a unit is done, copying the input in, and copying the output back. [...]

[...] sets of address and data signals. Since we will be instantiating several many copies of our MD5 unit, it makes sense to have them share memory as much as possible, so we will use the 2-port ROM for [...]

[...] last array reversed), we would keep the right bound and set the left bound to 0. So here is my C code to implement the solution. It takes the number in as command-line arguments, and prints out the [...]

[...] This post details the process of compiling C code into an AVR hex file and programming it onto an ATMega328 microcontroller using an Arduino Uno [...]

[...] generate interconnect logic to hook up different hardware modules. Hardware descriptions and C code can be found on Github. A Brief Aside on Memory-Mapped IO Before we begin, it’s useful to [...]

[...] a low-pass windowed sinc filter. The values for this filter can be generated using the following C code. There is one slight problem here though. These are floating point numbers, but we are using [...]

[...] at it if you’re interested in learning more. Setting up the Module When creating a Linux kernel module, we first need to register init and exit functions, which are run when the module is loaded [...]

[...] V, FPGA interrupts start at IRQ number 72, so our interrupt 0 corresponds to IRQ 72. The Linux Kernel Module In order to be able to handle these interrupts in software, we need to write a linux kernel [...]

[...] 1 and 15 to “/sys/bus/platform/drivers/blinker/blinker” and set the delay in the FPGA module. Conclusion So now you know how to write a basic device driver. There are a lot more things [...]