As far as I understood from the example, it should be enough to enable "OCP
port" and point to TSC ADC registers (i.e. on-board/internal ADC registers)
in order to configure and read values, am I right?
Hence, I wrote down a header file (i.e. sys_tscadcss.h) which contains the
structure that represents the TSC ADC registers (e.g. sysTscadcss struct
with register fields REVISION, SYSCONFIG, etc.). Then, I created also the
TSCADCSS variable of type sysTscadcss in this header file.
In order to point to the right TSC ADC's memory location (i.e. 0x44E0D000),
I used two ways that I took from some examples of PRU software support
package:
1. "#define TSCADCSS (*((volatile sysTscadcss*)0x44E0D000))" ;
2. "volatile __far sysTscadcss TSCADCSS
__attribute__((cregister("TSCADCSS", far), peripheral));" with its constant
define "TSCADCSS (R) : org = 0x44E0D000 len = 0x00000300 CREGISTER=27" in
AM335x_PRU.cmd file.
In both cases, the pru firmware compiles, and runs. However, in the same
both cases, when I try to read any register with a default value not equals
to 0 (e.g. REVISION, ADCSTAT, etc. ), I read 0.
Any idea what I am missing, please?
Il giorno giovedì 19 gennaio 2017 08:15:01 UTC+1, in...@orionitalia.com ha
scritto:
>
> On Mon, Jan 16, 2017 at 9:55 AM, Greg <soapy...@comcast.net> wrote:
>
>> I'm pretty sure that others have successfully accessed the internal ADCs
>> from the PRU. If you do some searching I think you can find a specific
>> instance.
>> I think it should be possible via the PRU's OCP master port.
>>
>
> So far, I found examples that access the internal ADC from PRU, but none
> using C language. For example, this
> <https://raw.githubusercontent.com/pgmmpk/beaglebone_pru_adc/master/src/firmware.p>
> is taken
> from the previously linked python library. We are going to deep our
> understanding of this example, hopefully it is possible to write a working
> counterpart in C :)
>
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