This repository contains Quartus projects using VHDL that can be used to learn the basics of language and FPGA or just simply in the projects. All the codes are written intentionally in very easy way so that one can actually understand the language. This repository was made to help begineers in the VHDL language or for people who are using FPGA for the first time. With a few codes, Python was also used to interface and control with PC.
For more information on VHDL, you can use this open source book for learning [here] (http:https://freerangefactory.org/pdf/df344hdh4h8kjfh3500ft2/free_range_vhdl.pdf)
For information on Cyclone V GX Starter Kit, you can see the specifications [here] (http:https://c5g.terasic.com/)
Other IC interfaces:
FT232 (UART)
IS61WV25616 (SRAM)
MLT42L128M32D1LF-25WTA (LPDDR2)
ADV7513 (HDMI)
SSM2603 (AUDIO)
SSM2603 (ADC)
This code demonstrate the use of clocks of C5G. Onboard LEDs and 7 segment display is used to show that. Leds blink according to counter of one clock while second clock is used to control Segment display.
This code demonstrate the use of KEY in debounce of C5G. KEYs are mechanical switched so when we press it, it gives us a few rises and falls before it gets to a stable state. It is due to the debouncing effect. This code counters that effects by taking a delay when we are reading the KEY.
Here, you can see the codes for 3 Communication Protocols: I2C, SPI, UART
This code demonstrate the I2C protocol on C5G. In I2C we have 2 pins, one a clock out to the device or daughter card and the other is a data pin. On the rising edge of the clock, data is latched in the device and after 8 data bits, acknowledgement is send by device if everything is correct. Usually, we first send device register address, then address of the register where we want to write and then data. This code gives data and clock at GPIO.
This code demonstrate the SPI protocol on C5G. Here 3 pins are used, SEN to enable the slave chip. SCLK as the clock for the chip. SDATA to send the data to the chip. CPOl and CPHA are 1 both (MODE 3).
This code demonstrate the use of UART FT232 of C5G. Different ways are used to use the UART protocols.
2 Memory controllers made: SRAM andSDRAM
This code demonstrate the use of SRAM of C5G. SWs used to Latch data and address to SRAM and to start Tx. LEDs are used to display data and address. Data as well as address is given from PC via UART. Qsys is NOT used and the controller is developed soft-wired.
This code demonstrate the use of SDRAM LPDDR2 of C5G. Different ways are used to use the SDRAM. Qsys is used to configure the cyclone V internal SDRAM controller, ie. controller is hard wired.
2 video protocols are developed: VGA and HDMI
This code demonstrate the use of VGA through GPIO of C5G. This code shows how to get VGA output from C5G GPIOs. only 3 bit video resolution is used for it but if you want to use more resolution then you can add a ladder circuit using registers to increase the resolution according to your need.
This code demonstrate the use of HDMI chip ADV7513 of C5G. This code shows how to initilize the ADV7513 for HDMI out via I2C protocol.Output resolution is 1918x1079 with 8 bits for defining RGB each.
This code demonstrate the use of Audio chip SSM2603 of C5G. This code shows how to initilize the SSM2603 for Audio out via I2C protocol. It gets the audio out by generating a single tone from the chip.
This code demonstrate the use of onboard ADC chip LTC2308fb of C5G. Data from all channels is taken and displayed on LEDs as well as send to PC via UART. 500 samples from each channel is taken before changing the channel. In PC 400 of these samples are shown of each channel. This is done so to be able to get to higher frequency with it. When data is being send via UART, ADC still converts the analog data. So, at that time, data is lost. The more the baudrate, less the data loss. Use of SRAM or SDRAM may be needed to avoid the data loss. Python script is there that taked the data and plots the voltage vs sample number graph. A code just to use single channel is also present.