Lerking/micropython
1
0
Fork 0
mirror of https://github.com/micropython/micropython.git synced 2026-01-05 11:40:18 +01:00
Code Issues Actions 27 Packages Projects Releases Wiki Activity

ports: Make PWM duty_u16 have an upper value of 65535 across all ports.

Browse Source 
The following ports used 65536 as the upper value (100% duty cycle) and are
changed in this commit to use 65535: esp8266, mimxrt, nrf, samd.

Tested that output is high at `duty_u16(65535)` and low at `duty_u16(0)`.
Also verified that at `duty_u16(32768)` the high and low pulse have the
same length.

Partially reverts #10850, commits 9c7ad68165
and 2ac643c15b.

Signed-off-by: robert-hh <robert@hammelrath.com>
This commit is contained in:
robert-hh
2024-11-04 16:04:56 +01:00
committed by Damien George
parent 5dc9eda195
commit 898407defb
7 changed files with 16 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
docs/mimxrt/quickref.rst
View File

@@ -193,7 +193,7 @@ PWM Constructor
- *freq* should be an integer which sets the frequency in Hz for the
PWM cycle. The valid frequency range is 15 Hz resp. 18Hz resp. 24Hz up to > 1 MHz.
- *duty_u16* sets the duty cycle as a ratio ``duty_u16 / 65536``.
- *duty_u16* sets the duty cycle as a ratio ``duty_u16 / 65535``.
The duty cycle of a X channel can only be changed, if the A and B channel
of the respective submodule is not used. Otherwise the duty_16 value of the
X channel is 32768 (50%).
@@ -231,7 +231,7 @@ is created by dividing the pwm_clk signal by an integral factor, according to th
f = pwm_clk / (2**n * m)
with n being in the range of 0..7, and m in the range of 2..65536. pmw_clk is 125Mhz
with n being in the range of 0..7, and m in the range of 2..65535. pmw_clk is 125Mhz
for MIMXRT1010/1015/1020, 150 MHz for MIMXRT1050/1060/1064 and 160MHz for MIMXRT1170.
The lowest frequency is pwm_clk/2**23 (15, 18, 20Hz). The highest frequency with
U16 resolution is pwm_clk/2**16 (1907, 2288, 2441 Hz), the highest frequency
@@ -255,7 +255,7 @@ Use the :ref:`machine.ADC <machine.ADC>` class::
from machine import ADC
adc = ADC(Pin('A2')) # create ADC object on ADC pin
adc.read_u16() # read value, 0-65536 across voltage range 0.0v - 3.3v
adc.read_u16() # read value, 0-65535 across voltage range 0.0v - 3.3v
The resolution of the ADC is 12 bit with 10 to 11 bit accuracy, irrespective of the
value returned by read_u16(). If you need a higher resolution or better accuracy, use

4
docs/samd/quickref.rst
View File

@@ -215,7 +215,7 @@ PWM Constructor
- *freq* should be an integer which sets the frequency in Hz for the
PWM cycle. The valid frequency range is 1 Hz to 24 MHz.
- *duty_u16* sets the duty cycle as a ratio ``duty_u16 / 65536``.
- *duty_u16* sets the duty cycle as a ratio ``duty_u16 / 65535``.
- *duty_ns* sets the pulse width in nanoseconds. The limitation for X channels
apply as well.
- *invert*\=True|False. Setting a bit inverts the respective output.
@@ -246,7 +246,7 @@ Use the :ref:`machine.ADC <machine.ADC>` class::
from machine import ADC
adc0 = ADC(Pin('A0')) # create ADC object on ADC pin, average=16
adc0.read_u16() # read value, 0-65536 across voltage range 0.0v - 3.3v
adc0.read_u16() # read value, 0-65535 across voltage range 0.0v - 3.3v
adc1 = ADC(Pin('A1'), average=1) # create ADC object on ADC pin, average=1
The resolution of the ADC is 12 bit with 12 bit accuracy, irrespective of the