circuitpython/ports/mimxrt
robert-hh 81f706aee4 mimxrt: Support PWM using the FLEXPWM and QTMR modules.
Frequency range 15Hz/18Hz to > 1 MHz, with decreasing resolution of the
duty cycle.  The basic API is supported as documentated, except that
keyword parameters are accepted for both the instatiaton and the
PWM.init() call.

Extensions: support PWM for channel pairs.  Channel pairs are declared by
supplying 2-element tuples for the pins.  The two channels of a pair must
be the A/B channel of a FLEXPWM module.  These form than a complementary
pair.

Additional supported keyword arguments:

- center=value Defines the center position of a pulse within the pulse
  cycle.  The align keyword is actually shortcut for center.

- sync=True|False: If set to True, the channels will be synchronized to a
  submodule 0 channel, which has already to be enabled.

- align=PWM.MIDDLE | PMW.BEGIN | PWM.END. It defines, whether synchronized
  channels are Center-Aligned or Edge-aligned.  The channels must be either
  complementary a channel pair or a group of synchronized channels.  It may
  as well be applied to a single channel, but withiout any benefit.

- invert= 0..3. Controls ouput inversion of the pins.  Bit 0 controls the
  first pin, bit 1 the second.

- deadtime=time_ns time of complementary channels for delaying the rising
  slope.

- xor=0|1|2 xor causes the output of channel A and B to be xored.  If
  applied to a X channel, it shows the value oif A ^ B.  If applied to an A
  or B channel, both channel show the xored signal for xor=1.  For xor=2,
  the xored signal is split between channels A and B.  See also the
  Reference Manual, chapter about double pulses.  The behavior of xor=2 can
  also be achieved using the center method for locating a pulse within a
  clock period.

The output is enabled for board pins only.

CPU pins may still be used for FLEXPWM, e.g. as sync source, but the signal
will not be routed to the output.  That applies only to FLEXPWM pins.  The
use of QTMR pins which are not board pins will be rejected.

As part of this commit, the _WFE() statement is removed from
ticks_delay_us64() to prevent PWM glitching during calls to sleep().
2021-11-24 13:48:27 +11:00
..
boards mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
hal mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
lwip_inc mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
mbedtls mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
modules mimxrt/sdcard: Implement SDCard driver. 2021-09-07 20:45:33 +02:00
Makefile mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
README.md mimxrt: Extend the help() message and README.md. 2021-10-25 23:52:08 +11:00
board_init.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
dma_channel.c mimxrt/dma_channel: Fix the DMA channel management. 2021-10-25 15:50:44 +11:00
dma_channel.h mimxrt/machine_spi: Add the SPI class to the machine module. 2021-06-26 22:14:47 +10:00
eth.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
eth.h mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
fatfs_port.c mimxrt/sdcard: Implement SDCard driver. 2021-09-07 20:45:33 +02:00
led.c mimxrt: Implement machine.Pin class. 2021-05-26 00:12:42 +10:00
led.h mimxrt: Implement machine.Pin class. 2021-05-26 00:12:42 +10:00
machine_adc.c mimxrt/machine_adc: Add the ADC class to the machine module. 2021-06-04 00:51:58 +10:00
machine_bitstream.c mimxrt: Fix cycle counter for time.ticks_cpu() and machine.bitstream(). 2021-10-25 15:50:44 +11:00
machine_i2c.c mimxrt/machine_i2c: Add hardware-based machine.I2C to machine module. 2021-07-15 00:36:31 +10:00
machine_led.c mimxrt/machine_led: Use mp_raise_msg_varg helper. 2021-07-15 00:12:41 +10:00
machine_pin.c mimxrt/machine_pin: Implement ioctl for Pin. 2021-08-16 15:03:50 +10:00
machine_pwm.c mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
machine_rtc.c all: Update to point to files in new shared/ directory. 2021-07-12 17:08:10 +10:00
machine_sdcard.c mimxrt/sdcard: Implement SDCard driver. 2021-09-07 20:45:33 +02:00
machine_spi.c mimxrt/machine_spi: Add the SPI class to the machine module. 2021-06-26 22:14:47 +10:00
machine_timer.c mimxrt/machine_timer: Leave the Timer clock source at IPG clock. 2021-06-03 13:03:02 +10:00
machine_uart.c mimxrt/machine_uart: Add the UART class to the machine module. 2021-06-16 01:21:15 +10:00
machine_wdt.c mimxrt/modmachine: Implement machine.WDT() and machine.reset_cause(). 2021-10-25 15:43:56 +11:00
main.c mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
mimxrt_flash.c mimxrt/sdram: Add SDRAM support. 2021-10-22 08:23:24 +02:00
mimxrt_sdram.c mimxrt/sdram: Add SDRAM support. 2021-10-22 08:23:24 +02:00
modmachine.c mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
modmachine.h mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
modmimxrt.c mimxrt: Add dht_readinto() to the mimxrt module, and freeze dht.py. 2021-10-25 23:49:28 +11:00
modmimxrt.h mimxrt: Add flash storage support with VFS and littlefs filesystem. 2021-06-01 23:42:57 +10:00
moduos.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
modutime.c all: Update to point to files in new shared/ directory. 2021-07-12 17:08:10 +10:00
mpconfigport.h mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
mphalport.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
mphalport.h mimxrt: Fix mp_hal_quiet_timing_enter()/exit() so timer still runs. 2021-11-16 23:20:06 +11:00
mpnetworkport.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
network_lan.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
pendsv.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
pendsv.h mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
pin.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
pin.h mimxrt/sdram: Add SDRAM support. 2021-10-22 08:23:24 +02:00
qstrdefsport.h mimxrt: Add new, minimal port to NXP i.MX RT series CPUs. 2020-03-11 15:34:13 +11:00
sdcard.c mimxrt/sdcard: Implement SDCard driver. 2021-09-07 20:45:33 +02:00
sdcard.h mimxrt/sdcard: Implement SDCard driver. 2021-09-07 20:45:33 +02:00
systick.c mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
systick.h mimxrt/eth: Add LAN support and integrate the network module. 2021-10-25 15:14:26 +11:00
ticks.c mimxrt: Support PWM using the FLEXPWM and QTMR modules. 2021-11-24 13:48:27 +11:00
ticks.h mimxrt: Improve ticks and sleep functions using GPT. 2021-05-18 22:36:32 +10:00
tusb_config.h ports: Update to build with new tinyusb. 2021-02-12 12:50:36 +11:00
tusb_port.c ports: Rename USBD_VID/PID config macros to MICROPY_HW_USB_VID/PID. 2021-08-07 23:13:55 +10:00

README.md

Port of MicroPython to NXP iMX RT 10xx

Currently supports Teensy 4.0, Teensy 4.1, and the MIMXRT1010_EVK, MIMXRT1020_EVK, MIMXRT1050_EVK, MIMXRT1060_EVK and MIMXRT1064_EVK boards.

Features:

  • REPL over USB VCP
  • machine.ADC
  • machine.I2C
  • machine.LED
  • machine.Pin
  • machine.PWM
  • machine.RTC
  • machine.SDCard
  • machine.SPI
  • machine.Signal
  • machine.SoftI2C
  • machine.SoftSPI
  • machine.Timer
  • machine.UART
  • LFS2 file system at the internal Flash
  • SDCard support (not on MIMXRT1010_EVK)
  • Ethernet (not on Teensy 4.0 and MIMXRT1010_EVK)

Known issues:

TODO:

  • More peripherals (Counter, I2S, CAN, etc)
  • More Python options