UM0851 datasheet(189/245 Pages) STMICROELECTRONICS

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UM0851

Human interface device (HID) drivers

Doc ID 16604 Rev 2

189/245

be stored. Type of data is unsigned int.

Count: can be greater than one only for channel zero where dma

transfers are possible. For all other channels it must be

equal to one otherwise error is returned. */

On success zero is returned, otherwise negative standard kernel errors are returned.

Get ADC configuration

Use the following calls to get the configuration of the ADC device:

User level:

ioctl (fd, ADCIOC_GET_CONFIG, &config);

On success zero is returned otherwise -1 is returned and errno is set appropriately.

Kernel level:

spear_adc_get_configure(dev, ADC_CHANNEL0, config);

On success zero is returned, otherwise negative standard kernel errors are returned.

In the function calls, config is instance of the previously defined struct adc_config.

Get ADC channel configuration

Use the following calls to get the configuration of any ADC channel:

User level:

ioctl (fd, ADCIOC_GET_CHAN_CONFIG, &chan_config);

On success, zero is returned otherwise -1 is returned and errno is set appropriately.

Kernel level:

spear_adc_get_chan_configure(dev, chan_config);

On success, zero is returned otherwise negative standard kernel errors are returned.

In the function calls, chan_config is an instance of the previously defined struct

adc_chan_config.

Close / put channel

The channel must be freed after you have finished using it to convert data for the moment.

This is done using the following call:

User level:

close(fd);

On success, zero is returned otherwise -1 is returned and errno is set appropriately.

Kernel level:

spear_adc_chan_put(dev, ADC_CHANNEL0);

On success, zero is returned otherwise negative standard kernel errors are returned.

UM0851 Datasheet(PDF) 189 Page - STMicroelectronics