MCP4921.h File Reference

Synchronous serial communication. More...

Go to the source code of this file.

Macros
#define	MCP4921_OutNonBlocking(code)   SPI0->TXDATA = code|(1<<12);
	Output data, nonblocking Send data to MCP4921 12-bit DAC without waiting for a response. This is useful in audio applications where DAC outputs are relatively infrequent and where the DAC response is meaningless. Since the state of the FIFO is not checked before sending, data may be lost. More...

Functions
void	MCP4921_Init (uint32_t data)
	initialize MCP4921 More...
void	MCP4921_Out (uint32_t data)
	Output data. More...

Detailed Description

Synchronous serial communication.

SPI uses a chip select, clock, and data out. This interface can be used for the MCP4921 DAC

Version

ECE445L

Author

Daniel Valvano and Jonathan Valvano

Copyright

Copyright 2026 by Jonathan W. Valvano, valva.nosp@m.no@m.nosp@m.ail.u.nosp@m.texa.nosp@m.s.edu,

Warning

AS-IS

Note

For more information see http://users.ece.utexas.edu/~valvano/

Date

June 28, 2026

SPI-DAC pins

Pin	Function	Description
PB18	SPI0 SCLK	DAC SPI clock (SPI)
PA8	SPI0 CS	DAC SPI CS
PB17	SPI0 PICO	DAC SPI data (SPI)