Hej,
I think my datasheet was from the TM4C123GH6PZ, I thought this is just
the re-branded lm4f120xl...
While the base timer clock speed is not configurable, the timer does
have a pre-scale register, right? Can't we use that to change the timers
freq? If not, I would say just adapt the freq
Hi
Yes, that would be great. Should I implement it in a PR, or has someone
something against this ?
Marc
On 2016-03-17 00:47, DipSwitch wrote:
Welcome!
It might also be an idea to create something like:
#ifndef HAS_PWM_RES_T
typedef uint16_t pwm_res_t
#endif
Which can be overridde
Welcome!
It might also be an idea to create something like:
#ifndef HAS_PWM_RES_T
typedef uint16_t pwm_res_t
#endif
Which can be overridden by the CPU implementation. This way 8bit timers can
use 8bit values and 32bit timers 32bit.
Cheers,
Nick
_
Hey,
Thank you for taking the time to try to help me solve my problem :)
The thing is that on the ek-lm4f120xl board, it's a lm4f120... The DS
you are referring to seems to be lm4f232 (or similar). I'm using the
lm4f120h5qr-124014.pdf as a reference.
The main reason I can see this is that ther
Hej Marc,
this seems like a pretty broken design to me, who knows what TI was
thinking... Anyway, by looking at the datasheet, I think that the
solution to this problem in this case is to map the values given via the
RIOT PWM interface to internal values that make the PWM behave as
expected.
Hi,
I have to say that I don't quite understand the problem with the 16-bit
max here. Is the timer on the lm4f120 limited to it's prescalers? For
applications like controller servo motors 16-bit is normally still more
than sufficient... So I think the key here lies in the PWM
implementation,
Hi,
Maybe you're right... PWM on lm4f120 is done by configuring a timer for
which there's no real prescaler and a match value that gives the duty
cycle. The timer is 16bits, but can be extended to 20bits if needed. The
timer is clocked by the system, so there's no way to fix a resolution
and
On 2016-03-18 12:01, Hauke Petersen wrote:
Hej,
I think my datasheet was from the TM4C123GH6PZ, I thought this is just
the re-branded lm4f120xl...
While the base timer clock speed is not configurable, the timer does
have a pre-scale register, right? Can't we use that to change the
timers freq?
Hi!
I'm cleaning a local port for lm4f120 and making new PR. I see
that a recent commit changed/cleaned the PWM API. One of the
changes includes limiting the resolution to 16bits (it was an int
before, so 32bits in my case). Is there a motivation for limiting
the value to 16bits ? In my case, the
