FPGAtoADC

Altera DE2 FPGA board based NIOS II SPI connection to ADC MCP3208.

SPI Communication using 8-bit segments (Mode 0,0: SCLK idles low).

To use NIOS II to implement connection to ADC MCP3208 on Altera DE2 Board:

1. The code is generic in nature.
2. Vary spiChannel to 0-7 to scan all the channels.
3. Sampling rates can be changed from the attached SOPC file.
4. All transfers are 8-bit wide.
5. As per datasheet of MCP3208, the SPI Master must send 3 byte of control words one byte at a time followed by one byte Read operation.
6. Finally, 3 bytes received from ADC are adjusted to retrieve 12-LSBs.

Find more at: http://ww1.microchip.com/downloads/en/DeviceDoc/21298c.pdf Refer to fig. 6.1, page 18.

Pin assignment:

Function	FPGA	MCP3208
MISO	GPIO_0[0]	DOUT
MOSI	GPIO_0[1]	DIN
SCLK	GPIO_0[2]	CLK
SS_n	GPIO_0[3]	CS'

+3.3V

GND