micropython/ports/rp2
Damien George 0afe60b876 rp2/rp2_pio: Track use of PIO resources and free them on soft reset.
Prior to this commit, on Pico W (where the CYW43 driver is enabled) the PIO
instruction memory was not released on soft reset, so using PIO after a
soft reset would eventually (after a few soft resets) lead to ENOMEM when
allocating a PIO program.

This commit fixes that by tracking the use of PIO memory by this module and
freeing it on soft reset.

Similarly, use of the state machines themselves are tracked and released on
soft reset.

Fixes issue #9003.

Signed-off-by: Damien George <damien@micropython.org>
2023-02-07 14:52:36 +11:00
..
boards ports: Make all network-capable boards use bundle-networking. 2023-02-01 12:42:06 +11:00
lwip_inc rp2/lwip_inc: Enable lwIP status callback. 2022-06-30 16:03:21 +10:00
mbedtls extmod/mbedtls: Enable elliptic curve DH and DSA cryptography. 2022-10-22 19:08:21 +11:00
modules rp2: Add USB MSC support. 2022-03-09 00:38:07 +11:00
CMakeLists.txt shared/runtime/gchelper: Drop cpu directive from ARM asm helpers. 2023-01-28 15:51:38 +11:00
Makefile rp2/Makefile: Add support for BOARD_VARIANTS. 2022-09-26 12:38:58 +10:00
README.md rp2: Integrate CYW43xx WiFi driver. 2022-06-30 17:03:51 +10:00
cyw43_configport.h rp2: Fix lightsleep to work with interrupts and cyw43 driver. 2022-12-20 15:54:51 +11:00
fatfs_port.c rp2/fatfs_port: Fix the modification date of files. 2022-10-12 00:31:38 +11:00
machine_adc.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
machine_bitstream.c rp2/machine_bitstream: Implement the machine.bitstream driver. 2021-11-17 10:01:15 +11:00
machine_i2c.c rp2: Rename machine I2C type consistently across ports. 2022-10-22 12:56:58 +11:00
machine_i2s.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
machine_pin.c rp2/machine_pin: Fix configuring OPEN_DRAIN with initial value. 2023-01-24 17:29:45 +11:00
machine_pin.h rp2/machine_pin: Add support for named pins and alternate functions. 2023-01-16 11:44:26 +11:00
machine_pin_cyw43.c rp2/machine_pin: Add support for named pins and alternate functions. 2023-01-16 11:44:26 +11:00
machine_pwm.c rp2/machine_pwm: Fix overflows with freq > 268 MHz. 2023-01-12 16:28:12 +11:00
machine_rtc.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
machine_spi.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
machine_timer.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
machine_uart.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
machine_wdt.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
main.c rp2/main: Use mp_printf in nlr_jump_fail. 2023-01-24 16:58:29 +11:00
memmap_mp.ld rp2: Mark gc_heap NOLOAD for faster boot. 2022-08-11 14:16:29 +10:00
modmachine.c rp2: Fix lightsleep to work with interrupts and cyw43 driver. 2022-12-20 15:54:51 +11:00
modmachine.h rp2: Rename machine I2C type consistently across ports. 2022-10-22 12:56:58 +11:00
modrp2.c rp2/modmachine: Move dht_readinto() to the machine module. 2022-11-09 15:57:17 +11:00
modrp2.h rp2: Add new port to Raspberry Pi RP2 microcontroller. 2021-01-30 00:42:29 +11:00
moduos.c py/objstr: Split mp_obj_str_from_vstr into bytes/str versions. 2022-08-26 16:43:55 +10:00
modutime.c all: Remove third argument to MP_REGISTER_MODULE. 2022-06-02 16:31:37 +10:00
mpbthciport.c py/obj: Convert make_new into a mp_obj_type_t slot. 2022-09-19 19:06:15 +10:00
mpbthciport.h rp2: Add support for bluetooth module using NimBLE. 2021-09-19 23:09:59 +10:00
mpconfigport.h extmod/modnetwork: Use a type protocol to implement NIC functions. 2022-12-15 17:40:06 +11:00
mphalport.c rp2: Allow enabling USB device without enabling USB-CDC. 2022-11-11 16:49:18 +11:00
mphalport.h rp2/machine_pin: Fix configuring OPEN_DRAIN with initial value. 2023-01-24 17:29:45 +11:00
mpnetworkport.c rp2: Fix lightsleep to work with interrupts and cyw43 driver. 2022-12-20 15:54:51 +11:00
mpnimbleport.c rp2: Add support for bluetooth module using NimBLE. 2021-09-19 23:09:59 +10:00
mpnimbleport.h rp2: Add support for bluetooth module using NimBLE. 2021-09-19 23:09:59 +10:00
mpthreadport.c rp2: Make atomic sections suspend the other core (if active). 2022-07-12 16:20:21 +10:00
mpthreadport.h rp2/mpthreadport: Add mp_thread_deinit to reset core1 on soft reset. 2021-05-09 00:08:30 +10:00
msc_disk.c rp2: Add USB MSC support. 2022-03-09 00:38:07 +11:00
pendsv.c rp2: Integrate CYW43xx WiFi driver. 2022-06-30 17:03:51 +10:00
pendsv.h rp2: Integrate CYW43xx WiFi driver. 2022-06-30 17:03:51 +10:00
qstrdefsport.h rp2: Add new port to Raspberry Pi RP2 microcontroller. 2021-01-30 00:42:29 +11:00
rp2_flash.c rp2/rp2_flash: Call MICROPY_EVENT_POLL_HOOK_FAST after reading flash. 2023-01-12 16:53:02 +11:00
rp2_pio.c rp2/rp2_pio: Track use of PIO resources and free them on soft reset. 2023-02-07 14:52:36 +11:00
uart.c all: Rename mp_keyboard_interrupt to mp_sched_keyboard_interrupt. 2021-04-30 15:13:43 +10:00
uart.h rp2: Add new port to Raspberry Pi RP2 microcontroller. 2021-01-30 00:42:29 +11:00
usbd.c shared/tinyusb: Further refactor static USB device implementation. 2022-11-11 16:47:36 +11:00

README.md

The RP2 port

This is a port of MicroPython to the Raspberry Pi RP2 series of microcontrollers. Currently supported features are:

  • REPL over USB VCP, and optionally over UART (on GP0/GP1).
  • Filesystem on the internal flash, using littlefs2.
  • Support for native code generation and inline assembler.
  • utime module with sleep, time and ticks functions.
  • uos module with VFS support.
  • machine module with the following classes: Pin, ADC, PWM, I2C, SPI, SoftI2C, SoftSPI, Timer, UART, WDT.
  • rp2 module with programmable IO (PIO) support.

See the examples/rp2/ directory for some example code.

Building

The MicroPython cross-compiler must be built first, which will be used to pre-compile (freeze) built-in Python code. This cross-compiler is built and run on the host machine using:

$ make -C mpy-cross

This command should be executed from the root directory of this repository. All other commands below should be executed from the ports/rp2/ directory.

Building of the RP2 firmware is done entirely using CMake, although a simple Makefile is also provided as a convenience. To build the firmware run (from this directory):

$ make submodules
$ make clean
$ make

You can also build the standard CMake way. The final firmware is found in the top-level of the CMake build directory (build by default) and is called firmware.uf2.

If you are using a different board other than a Rasoberry Pi Pico, then you should pass the board name to the build; e.g. for Raspberry Pi Pico W:

$ make BOARD=PICO_W submodules
$ make BOARD=PICO_W clean
$ make BOARD=PICO_W

Deploying firmware to the device

Firmware can be deployed to the device by putting it into bootloader mode (hold down BOOTSEL while powering on or resetting) and then copying firmware.uf2 to the USB mass storage device that appears.

If MicroPython is already installed then the bootloader can be entered by executing import machine; machine.bootloader() at the REPL.

Sample code

The following samples can be easily run on the board by entering paste mode with Ctrl-E at the REPL, then cut-and-pasting the sample code to the REPL, then executing the code with Ctrl-D.

Blinky

This blinks the on-board LED on the Pico board at 1.25Hz, using a Timer object with a callback.

from machine import Pin, Timer
led = Pin(25, Pin.OUT)
tim = Timer()
def tick(timer):
    global led
    led.toggle()

tim.init(freq=2.5, mode=Timer.PERIODIC, callback=tick)

PIO blinky

This blinks the on-board LED on the Pico board at 1Hz, using a PIO peripheral and PIO assembler to directly toggle the LED at the required rate.

from machine import Pin
import rp2

@rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)
def blink_1hz():
    # Turn on the LED and delay, taking 1000 cycles.
    set(pins, 1)
    set(x, 31)                  [6]
    label("delay_high")
    nop()                       [29]
    jmp(x_dec, "delay_high")

    # Turn off the LED and delay, taking 1000 cycles.
    set(pins, 0)
    set(x, 31)                  [6]
    label("delay_low")
    nop()                       [29]
    jmp(x_dec, "delay_low")

# Create StateMachine(0) with the blink_1hz program, outputting on Pin(25).
sm = rp2.StateMachine(0, blink_1hz, freq=2000, set_base=Pin(25))
sm.active(1)

See the examples/rp2/ directory for further example code.