4726

Microchip MCP4706/4716/4726 DAC.

The digital-analog-converter operates over I2C.

include/nuttx/analog/mcp47x6.h. All structures and APIs needed to work with DAC drivers are provided in this header file.

The following features are configurable via the ioctl interface of the device:

gain
power down
voltage reference

Usage Example

#include <nuttx/analog/dac.h>
#include <nuttx/analog/mcp47x6.h>

struct dac_dev_s *dac;
unsigned int const i2c_bus = 0;
unsigned int const i2c_address = 0x63;

/* create and register device */

dac = mcp47x6_initialize(i2c_bus, i2c_address);
dac_register("/dev/dac0", dac);

/* configure the DAC */

int fd = open("/dev/dac0", O_WRONLY | O_NONBLOCK);
ioctl(fd, ANIOC_MCP47X6_DAC_SET_REFERENCE, MCP47X6_REFERENCE_VREF_BUFFERED);

/* set DAC output value */

struct dac_msg_s dac_message = {
  .am_channel = 0,
  .am_data = 1234
};
write(fd, &dac_message, sizeof(dac_message));

/* clean up */

close(fd);