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aio: added configuration within platform data.

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* Allows for different bit shifting for each platform.
* New functions added for obtaining this information
* mraa_adc_raw_bits
* mraa_adc_supported_bits

* Update board information to include this. AIO module changed to allow
* use of the new board data

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>
This commit is contained in:
Thomas Ingleby
2014-06-25 17:32:41 +01:00
parent 9a81b043be
commit e5c7e64cf3
6 changed files with 57 additions and 9 deletions
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19
src/aio/aio.c
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@@ -34,6 +34,9 @@ struct _aio {
int adc_in_fp;
};
static int raw_bits;
static int sup_bits;
static mraa_result_t aio_get_valid_fp(mraa_aio_context dev)
{
char file_path[64]= "";
@@ -92,6 +95,8 @@ mraa_aio_context mraa_aio_init(unsigned int aio_channel)
free(dev);
return NULL;
}
raw_bits = mraa_adc_raw_bits();
sup_bits = mraa_adc_supported_bits();
return dev;
}
@@ -132,12 +137,14 @@ uint16_t mraa_aio_read(mraa_aio_context dev)
}
/* Adjust the raw analog input reading to supported resolution value*/
if (ADC_RAW_RESOLUTION_BITS > ADC_SUPPORTED_RESOLUTION_BITS) {
shifter_value = ADC_RAW_RESOLUTION_BITS - ADC_SUPPORTED_RESOLUTION_BITS;
analog_value = analog_value >> shifter_value;
} else {
shifter_value = ADC_SUPPORTED_RESOLUTION_BITS - ADC_RAW_RESOLUTION_BITS;
analog_value = analog_value << shifter_value;
if (raw_bits =! sup_bits) {
if (raw_bits > sup_bits) {
shifter_value = raw_bits - sup_bits;
analog_value = analog_value >> shifter_value;
} else {
shifter_value = sup_bits - raw_bits;
analog_value = analog_value << shifter_value;
}
}
return analog_value;