eCos® and eCosPro® Reference Manual
PrevNext

STR7XX ADC Driver

Name

STR7XX -- ADC Driver

Description

This driver supports the ADC devices available in some variants of the ST STR7XX family of microprocessors.

Sample Size

The STR7XX ADC produces 12 bit samples. Therefore this driver sets CYGNUM_IO_ADC_SAMPLE_SIZE to 12. This will cause the generic layer to define cyg_adc_sample_t as a 16 bit value.

Sample Rates

The ADC hardware is limited to a maximum of 1K samples per channel. Since channels are sampled on a round-robin basis at 4 times this rate, this means that the total sample rate is 4K samples per second.

The option CYGNUM_DEVS_ADC_ARM_STR7XX_DEFAULT_RATE defines a default sample rate and is initially set to 500.

Configuration

For each channel X supported the CDL script provides the following configuration options:

cdl_component CYGPKG_DEVS_ADC_ARM_STR7XX_CHANNELX

This defines whether the channel is included.

cdl_option CYGDAT_DEVS_ADC_ARM_STR7XX_CHANNELN_NAME

This defines the name of the channel.

cdl_option CYGNUM_DEVS_ADC_ARM_STR7XX_CHANNELX_BUFSIZE

This defines the size of the channel's sample buffer, in samples.

PrevHomeNext
STR7XX ADC DriverUpFramebuffer Support
    
   
2013-04-11   Documentation license for this page: eCosPro License
   
         
 
  Copyright © 2003-2013 eCosCentric Limited Privacy & Legal Statements