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diff --git a/docs/mimxrt/quickref.rst b/docs/mimxrt/quickref.rst new file mode 100644 index 000000000..b87a343bd --- /dev/null +++ b/docs/mimxrt/quickref.rst @@ -0,0 +1,864 @@ +.. _mimxrt_quickref: + +Quick reference for the i.MXRT family +===================================== + +.. image:: img/teensy_4.1.jpg + :alt: Teensy 4.1 board + :width: 640px + +The Teensy 4.1 board. + +Below is a quick reference for i.MXRT-based boards. If it is your first time +working with this board it may be useful to get an overview of the microcontroller: + +.. toctree:: + :maxdepth: 1 + + general.rst + tutorial/intro.rst + + +Installing MicroPython +---------------------- + +See the corresponding section of tutorial: :ref:`mimxrt_intro`. It also includes +a troubleshooting subsection. + +General board control +--------------------- + +The MicroPython REPL is on the USB port, configured in VCP mode. +Tab-completion is useful to find out what methods an object has. +Paste mode (ctrl-E) is useful to paste a large slab of Python code into +the REPL. + +The :mod:`machine` module:: + + import machine + + machine.freq() # get the current frequency of the CPU + +Delay and timing +---------------- + +Use the :mod:`time <time>` module:: + + import time + + time.sleep(1) # sleep for 1 second + time.sleep_ms(500) # sleep for 500 milliseconds + time.sleep_us(10) # sleep for 10 microseconds + start = time.ticks_ms() # get millisecond counter + delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference + +Timers +------ + +The i.MXRT port has three hardware timers. Use the :ref:`machine.Timer <machine.Timer>` class +with a timer ID from 0 to 2 (inclusive):: + + from machine import Timer + + tim0 = Timer(0) + tim0.init(period=5000, mode=Timer.ONE_SHOT, callback=lambda t:print(0)) + + tim1 = Timer(1) + tim1.init(period=2000, mode=Timer.PERIODIC, callback=lambda t:print(1)) + +The period is in milliseconds. + +Virtual timers are not currently supported on this port. + +.. _mimxrt_Pins_and_GPIO: + +Pins and GPIO +------------- + +Use the :ref:`machine.Pin <machine.Pin>` class:: + + from machine import Pin + + p0 = Pin('D0', Pin.OUT) # create output pin on GPIO0 + p0.on() # set pin to "on" (high) level + p0.off() # set pin to "off" (low) level + p0.value(1) # set pin to on/high + + p2 = Pin('D2', Pin.IN) # create input pin on GPIO2 + print(p2.value()) # get value, 0 or 1 + + p4 = Pin('D4', Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor + p5 = Pin('D5', Pin.OUT, value=1) # set pin high on creation + + p6 = Pin(pin.cpu.GPIO_B1_15, Pin.OUT) # Use the cpu pin name. + +Available Pins follow the ranges and labelling of the respective board, like: + +- 0-33 for Teensy 4.0, +- 0-21 for the MIMXRT10xx-EVK board, or 'D0-Dxx', or 'A0-Ann', +- 0-14 for the Olimex RT1010Py board, or 'D0'-'Dxx' and 'A0'-'Ann' +- 'J3_xx', 'J4_xx', 'J5_xx' for the Seeed ARCH MIX board, + +or the pin names of the Pin.board or Pin.cpu classes. + +Notes: + +* The MIMXRT1xxx-EVK boards may have other on-board devices connected to these + pins, limiting it's use for input or output. +* At the MIMXRT1010_EVK, pins D4, D5 and D9 of the Arduino connector are by + default not connected to the MCU. For details refer to the schematics. +* At the MIMXRT1170_EVK board, the inner rows of the Arduino connectors are assigned as follows: + - D16 - D23: J9, odd pin numbers; D17 is by default not connected. + - D24 - D27: J26, odd pin numbers; J63-J66 have to be closed to enable these pins. + - D29 - D36: J25, odd pin numbers; D29 and D30 are by default not connected. + +There's a higher-level abstraction :ref:`machine.Signal <machine.Signal>` +which can be used to invert a pin. Useful for illuminating active-low LEDs +using ``on()`` or ``value(1)``. + +UART (serial bus) +----------------- + +See :ref:`machine.UART <machine.UART>`. :: + + from machine import UART + + uart1 = UART(1, baudrate=115200) + uart1.write('hello') # write 5 bytes + uart1.read(5) # read up to 5 bytes + +The i.MXRT has up to eight hardware UARTs, but not every board exposes all +TX and RX pins for users. The pin assignment of UARTs to pins is fixed. +The UARTs are numbered 1..8. The rx/tx pins are assigned according to the +tables below: + +================ =========== =========== =========== =========== +Board / Pin UART0 UART1 UART2 UART3 +================ =========== =========== =========== =========== +Teensy 4.0 - 0/1 7/8 14/15 +Teensy 4.1 - 0/1 7/8 14/15 +MIMXRT1010-EVK Debug USB D0/D1 D7/D6 - +MIMXRT1015-EVK Debug USB D0/D1 D7/A1 - +MIMXRT1020-EVK Debug USB D0/D1 D9/D6 D10/D13 +MIMXRT1050-EVK Debug USB D0/D1 D7/D6 D8/D9 +MIMXRT1050-EVKB Debug USB D0/D1 D7/D6 D8/D9 +MIMXRT1060-EVK Debug USB D0/D1 D7/D6 D8/D9 +MIMXRT1064-EVK Debug USB D0/D1 D7/D6 D8/D9 +MIMXRT1170-EVK Debug USB D0/D1 D12/D11 D10/D13 +Olimex RT1010Py - RxD/TxD D5/D6 - +Seeed ARCH MIX - J3_19/J3_20 J4_16/J4_17 J4_06/J4_07 +================ =========== =========== =========== =========== + +================ =========== =========== ======= ======= ===== +Board / Pin UART4 UART5 UART6 UART7 UART8 +================ =========== =========== ======= ======= ===== +Teensy 4.0 16/17 21/20 25/24 28/29 - +Teensy 4.1 16/17 21/20 25/24 28/29 34/35 +MIMXRT1010-EVK - - - - - +MIMXRT1015-EVK - - - - - +MIMXRT1020-EVK D15/D14 A1/A0 - - - +MIMXRT1050-EVK A1/A0 - - - - +MIMXRT1050-EVKB A1/A0 - - - - +MIMXRT1060-EVK A1/A0 - - - - +MIMXRT1064-EVK A1/A0 - - - - +MIMXRT1170-EVK D15/D14 D25/D26 D33/D34 D35/D36 - +Olimex RT1010Py - - - - - +Seeed ARCH MIX J4_10/J4_11 J5_08/J5_12 - - - +================ =========== =========== ======= ======= ===== + +PWM (pulse width modulation) +---------------------------- + +The i.MXRT has up to four dedicated PWM modules with four FLEXPWM submodules each +and up to four QTMR modules with four channels, which can be used to generate +a PWM signal or signal pair. + +The PWM functions are provided by the :ref:`machine.PWM <machine.PWM>` class. +It supports all basic methods listed for that class and a few additional methods for +handling signal groups. :: + + # Samples for Teensy + # + + from machine import Pin, PWM + + pwm2 = PWM(Pin(2)) # create PWM object from a pin + pwm2.freq() # get current frequency + pwm2.freq(1000) # set frequency + pwm2.duty_u16() # get current duty cycle, range 0-65535 + pwm2.duty_u16(200) # set duty cycle, range 0-65535 + pwm2.deinit() # turn off PWM on the pin + # create a complementary signal pair on Pin 2 and 3 + pwm2 = PWM((2, 3), freq=2000, duty_ns=20000) + + # Create a group of four synchronized signals. + # Start with Pin(4) at submodule 0, which creates the sync pulse. + pwm4 = PWM(Pin(4), freq=1000, align=PWM.HEAD) + # Pins 5, 6, and 9 are pins at the same module + pwm5 = PWM(Pin(5), freq=1000, duty_u16=10000, align=PWM.HEAD, sync=True) + pwm6 = PWM(Pin(6), freq=1000, duty_u16=20000, align=PWM.HEAD, sync=True) + pwm9 = PWM(Pin(9), freq=1000, duty_u16=30000, align=PWM.HEAD, sync=True) + + pwm3 # show the PWM objects properties + + +PWM Constructor +``````````````` + +.. class:: PWM(dest, freq, duty_u16, duty_ns, *, center, align, invert, sync, xor, deadtime) + :noindex: + + Construct and return a new PWM object using the following parameters: + + - *dest* is the entity on which the PWM is output, which is usually a + :ref:`machine.Pin <machine.Pin>` object, but a port may allow other values, + like integers or strings, which designate a Pin in the machine.PIN class. + *dest* is either a single object or a two element object tuple. + If the object tuple is specified, the two pins act in complementary + mode. These two pins must be the A/B channels of the same submodule. + + PWM objects are either provided by a FLEXPWM module or a QTMR module. + The i.MXRT devices have either two or four FLEXPWM and QTMR modules. + Each FLEXPWM module has four submodules with three channels, each, + called A, B and X. Each QTMR module has four channels. + Each FLEXPWM submodule or QTMR channel may be set to different parameters. + Not every channel is routed to a board pin. Details are listed below. + + Setting *freq* affects the three channels of the same FLEXPWM submodule. + Only one of *duty_u16* and *duty_ns* should be specified at a time. + + Keyword arguments: + + - *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``. + 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%). + - *duty_ns* sets the pulse width in nanoseconds. The limitation for X channels + apply as well. + - *center*\=value. An integer sets the center of the pulse within the pulse period. + The range is 0-65535. The resulting pulse will last from center - duty_u16/2 to + center + duty_u16/2. + - *align*\=value. Shortcuts for the pulse center setting, causing the pulse either at + the center of the frame (value=0), the leading edge at the begin (value=1) or the + trailing edge at the end of a pulse period (value=2). + - *invert*\=True|False channel_mask. Setting a bit in the mask inverts the respective channel. + Bit 0 inverts the first specified channel, bit 2 the second. The default is 0. + - *sync*\=True|False. If a channel of a module's submodule 0 is already active, other + submodules of the same module can be forced to be synchronous to submodule 0. Their + pulse period start then at at same clock cycle. The default is False. + - *xor*\=0|1|2. If set to 1 or 2, the channel will output the XOR'd signal from channels + A or B. If set to 1 on channel A or B, both A and B will show the same signal. If set + to 2, A and B will show alternating signals. For details and an illustration, please + refer to the MCU's reference manual, chapter "Double Switching PWMs". + - *deadtime*\=time_ns. This setting affects complementary channels and defines a deadtime + between an edge of a first channel and the edge of the next channel, in which both + channels are set to low. That allows connected H-bridges to switch off one side + of a push-pull driver before switching on the other side. + +PWM Methods +``````````` + +The methods are identical to the generic :ref:`machine.PWM <machine.PWM>` class, +with additional keyword arguments to the init() method, matchings those of the constructor. + +Each FLEX submodule or QTMR module may run at different frequencies. The PWM signal +is created by dividing the pwm_clk signal by an integral factor, according to the formula:: + + 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 +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 +with 1 percent resolution is pwm_clk/100 (1.25, 1.5, 1.6 MHz). The highest achievable +frequency is pwm_clk/3 for the A/B channels, and pwm_clk/2 for the X channels and QTMR +signal. + +PWM Pin Assignment +`````````````````` + +Pins are specified in the same way as for the Pin class. The following tables show +the assignment of the board Pins to PWM modules: + +=========== ========== ========== ====== ============== ====== +Pin/ MIMXRT 1010 1015 1020 1050/1060/1064 1170 +=========== ========== ========== ====== ============== ====== +D0 - Q1/1 F1/1/B - - +D1 - Q1/0 F1/1/A - - +D2 F1/3/B F1/3/A - F1/3/B - +D3 F1/3/A F1/0/A F2/3/B F4/0/A F1/2/A +D4 F1/3/A (*) Q1/2 Q2/1 F2/3/A Q4/2 +D5 F1/0/B (*) F1/0/B F2/3/A F1/3/A F1/2/B +D6 - F1/2/B F2/0/A Q3/2 F1/0/A +D7 - - F1/0/A Q3/3 - +D8 F1/0/A F1/1/B F1/0/B F1/1/X Q4/3 +D9 F1/1/B (*) F1/2/A F2/0/B F1/0/X F1/0/B +D10 F1/3/B - F2/2/B F1/0/B (*) F2/2/B +D11 F1/2/A - F2/1/A F1/1/A (*) - +D12 F1/2/B - F2/1/B F1/1/B (*) - +D13 F1/3/A - F2/2/A F1/0/A (*) F2/2/A +D14 F1/0/B - - F2/3/B - +D15 F1/0/A - - F2/3/A - +A0 - - F1/2/A - - +A1 F1/3/X F1/3/B F1/2/B - - +A2 F1/2/X F1/3/A F1/3/A - - +A3 - F1/2/A F1/3/B - - +A4 - - - Q3/1 - +A5 - - - Q3/0 - +D31 - - - - F1/2/B +D32 - - - - F1/2/A +D33 - - - - F1/1/B +D34 - - - - F1/1/A +D35 - - - - F1/0/B +D36 - - - - F1/0/A +=========== ========== ========== ====== ============== ====== + +Pins denoted with (*) are by default not wired at the board. + +==== ========== ==== ========== +Pin Teensy 4.0 Pin Teensy 4.1 +==== ========== ==== ========== +0 F1/1/X 0 F1/1/X +1 F1/0/X 1 F1/0/X +2 F4/2/A 2 F4/2/A +3 F4/2/B 3 F4/2/B +4 F2/0/A 4 F2/0/A +5 F2/1/A 5 F2/1/A +6 F2/2/A 6 F2/2/A +7 F1/3/B 7 F1/3/B +8 F1/3/A 8 F1/3/A +9 F2/2/B 9 F2/2/B +10 Q1/0 10 Q1/0 +11 Q1/2 11 Q1/2 +12 Q1/1 12 Q1/1 +13 Q2/0 13 Q2/0 +14 Q3/2 14 Q3/2 +15 Q3/3 15 Q3/3 +18 Q3/1 18 Q3/1 +19 Q3/0 19 Q3/0 +22 F4/0/A 22 F4/0/A +23 F4/1/A 23 F4/1/A +24 F1/2/X 24 F1/2/X +25 F1/3/X 25 F1/3/X +28 F3/1/B 28 F3/1/B +29 F3/1/A 29 F3/1/A +33 F2/0/B 33 F2/0/B +- - 36 F2/3/A +- - 37 F2/3/B +DAT1 F1/1/B 42 F1/1/B +DAT0 F1/1/A 43 F1/1/A +CLK F1/0/B 44 F1/0/B +CMD F1/0/A 45 F1/0/A +DAT2 F1/2/A 46 F1/2/A +DAT3 F1/2/B 47 F1/2/B +- - 48 F1/0/B +- - 49 F1/2/A +- - 50 F1/2/B +- - 51 F3/3/B +- - 52 F1/1/B +- - 53 F1/1/A +- - 54 F3/0/A +==== ========== ==== ========== + +========= ============== +Pin Seeed ARCH MIX +========= ============== +J3_04 Q4/3 +J3_10 Q1/3 +J3_12 Q2/3 +J3_13 Q3/3 +J3_16 Q3/0 +J3_17 Q3/1 +J3_19 F1/3/X +J3_20 F1/2/X +J4_08 F4/0/A +J4_09 F4/1/A +J4_16 Q3/2 +J4_17 Q3/3 +J5_32 Q1/0 +J5_28 Q1/1 +J5_29 Q1/2 +J5_30 Q2/0 +J5_04 Q2/1 +J5_05 Q2/3 +J5_06 F2/0/A +J5_07 F2/0/B +J5_08 F2/1/A +J5_12 F2/1/B +J5_13 F2/2/A +J5_14 F2/2/B +J5_23 F1/3/A +J5_24 F1/3/B +J5_25 F2/3/A +J5_26 F2/3/B +J5_42 Q3/0 +J5_43 Q3/1 +J5_50 F1/0/X +LED_RED F2/3/A +LED_GREEN F1/3/A +LED_BLUE F1/3/B +========= ============== + +========= =============== +Pin Olimex RT1010PY +========= =============== +D0 - +D1 F1/0/B +D2 F1/0/A +D3 F1/1/B +D4 F1/1/A +D5 F1/2/B +D6 F1/2/A +D7 F1/3/B +D8 F1/3/A +D9 - +D10 F1/0/B +D11 F1/0/A +D12 F1/1/B +D13 F1/1/A +D14 - +A0 - +A1 F1/2/B +A2 F1/2/A +A3 F1/3/B +A4 F1/3/A +SDI F1/3/X +SDO F1/2/X +CS0 F1/1/X +SCK F1/0/X +========= =============== + +Legend: + +* Qm/n: QTMR module m, channel n +* Fm/n/l: FLEXPWM module m, submodule n, channel l. The pulse at a X channel + is always aligned to the period start. + +Pins without a PWM signal are not listed. A signal may be available at more +than one Pin. FlexPWM pins may also be pure CPU pin, not assigned to a board +signal. In that case the PWM output is disabled. The PWM channel of a submodule +0 may still be used as synchronization source for other channels of the same +module, unless used by another peripheral. + +Submodule 0 pins for i.MX RT1011: + +================== ======= +Pin Channel +================== ======= +Pin.cpu.GPIO_01 B +Pin.cpu.GPIO_02 A +Pin.cpu.GPIO_AD_12 X +Pin.cpu.GPIO_SD_01 B +Pin.cpu.GPIO_SD_02 A +================== ======= + +Submodule 0 pins for i.MX RT1021: + +===================== ================== +Pin Module & Channel +===================== ================== +Pin.cpu.GPIO_AD_B1_06 FLEXPWM1 Channel A +Pin.cpu.GPIO_AD_B1_07 FLEXPWM1 Channel B +Pin.cpu.GPIO_EMC_26 FLEXPWM1 Channel A +Pin.cpu.GPIO_EMC_27 FLEXPWM1 Channel B +Pin.cpu.GPIO_AD_B0_14 FLEXPWM2 Channel A +Pin.cpu.GPIO_AD_B0_15 FLEXPWM2 Channel B +Pin.cpu.GPIO_EMC_10 FLEXPWM2 Channel X +Pin.cpu.GPIO_EMC_38 FLEXPWM2 Channel A +Pin.cpu.GPIO_EMC_39 FLEXPWM2 Channel B +===================== ================== + +Submodule 0 pins for i.MX RT1052, i.MX RT1062 and i.MX RT1064: + +===================== ================== +Pin Module & Channel +===================== ================== +Pin.cpu.GPIO_AD_B0_02 FLEXPWM1 Channel X +Pin.cpu.GPIO_EMC_23 FLEXPWM1 Channel A +Pin.cpu.GPIO_EMC_24 FLEXPWM1 Channel B +Pin.cpu.GPIO_SD_B0_00 FLEXPWM1 Channel A +Pin.cpu.GPIO_SD_B0_01 FLEXPWM1 Channel B +Pin.cpu.GPIO_B0_06 FLEXPWM2 Channel A +Pin.cpu.GPIO_B0_07 FLEXPWM2 Channel B +Pin.cpu.GPIO_EMC_06 FLEXPWM2 Channel A +Pin.cpu.GPIO_EMC_07 FLEXPWM2 Channel B +Pin.cpu.GPIO_EMC_29 FLEXPWM3 Channel A +Pin.cpu.GPIO_EMC_30 FLEXPWM3 Channel B +Pin.cpu.GPIO_AD_B1_08 FLEXPWM4 Channel A +Pin.cpu.GPIO_EMC_00 FLEXPWM4 Channel A +Pin.cpu.GPIO_EMC_01 FLEXPWM4 Channel B +===================== ================== + +Submodule 0 pins for i.MX RT1176 + +====================== ====================== +Pin Module & Channel +====================== ====================== +Pin.cpu.GPIO_EMC_B1_00 FLEXPWM4 Channel A (*) +Pin.cpu.GPIO_EMC_B1_01 FLEXPWM4 Channel B (*) +Pin.cpu.GPIO_EMC_B1_06 FLEXPWM2 Channel A (*) +Pin.cpu.GPIO_EMC_B1_07 FLEXPWM2 Channel B (*) +Pin.cpu.GPIO_EMC_B1_23 FLEXPWM1 Channel A (*) +Pin.cpu.GPIO_EMC_B1_24 FLEXPWM1 Channel B (*) +Pin.cpu.GPIO_EMC_B1_29 FLEXPWM3 Channel A (*) +Pin.cpu.GPIO_EMC_B1_30 FLEXPWM3 Channel B (*) +Pin.cpu.GPIO_AD_00 FLEXPWM1 Channel A +Pin.cpu.GPIO_AD_01 FLEXPWM1 Channel B +Pin.cpu.GPIO_AD_24 FLEXPWM2 Channel A +Pin.cpu.GPIO_AD_25 FLEXPWM2 Channel B +====================== ====================== + +(*) Pin used for SDRAM + +ADC (analog to digital conversion) +---------------------------------- + +On the i.MXRT ADC functionality is available on Pins labeled 'Ann'. + +Use the :ref:`machine.ADC <machine.ADC>` class:: + + from machine import ADC + + adc = ADC(Pin(32)) # create ADC object on ADC pin + adc.read_u16() # read value, 0-65536 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 +an external ADC. + +Software SPI bus +---------------- + +Software SPI (using bit-banging) works on all pins, and is accessed via the +:ref:`machine.SoftSPI <machine.SoftSPI>` class. :: + + from machine import Pin, SoftSPI + + # construct a SoftSPI bus on the given pins + # polarity is the idle state of SCK + # phase=0 means sample on the first edge of SCK, phase=1 means the second + spi = SoftSPI(baudrate=100000, polarity=1, phase=0, sck=Pin(0), mosi=Pin(2), miso=Pin(4)) + + spi.init(baudrate=200000) # set the baudrate + + spi.read(10) # read 10 bytes on MISO + spi.read(10, 0xff) # read 10 bytes while outputting 0xff on MOSI + + buf = bytearray(50) # create a buffer + spi.readinto(buf) # read into the given buffer (reads 50 bytes in this case) + spi.readinto(buf, 0xff) # read into the given buffer and output 0xff on MOSI + + spi.write(b'12345') # write 5 bytes on MOSI + + buf = bytearray(4) # create a buffer + spi.write_readinto(b'1234', buf) # write to MOSI and read from MISO into the buffer + spi.write_readinto(buf, buf) # write buf to MOSI and read MISO back into buf + +The highest supported baud rate is 500000. + +Hardware SPI bus +---------------- + +There are up to four hardware SPI channels that allow faster transmission +rates (up to 90Mhz). The SPI signals have fixed assignments to GPIO pins. +It depends on the board design, which SPI's signals are exposed to the user, as +detailed in the table below. The signal order in the table is: CS0, CS1, MOSI, MISO, CLK. + +================= ========================= ======================= =============== +Board / Pin SPI0 SPI1 SPI2 +================= ========================= ======================= =============== +Teensy 4.0 10/-/11/12/13 0/-/26/1/27 - +Teensy 4.1 10/37/11/12/13 0/-/26/1/27 -/29/50/54/49 +MIXMXRT1010-EVK D10/D7/D11/D12/D13 - - +MIXMXRT1015-EVK D10/-/D11/D12/D13 - - +MIXMXRT1020-EVK D10/-/D11/D12/D13 A3/D0/A5/A4/A0 - +MIXMXRT1050-EVK D10/-/D11/D12/D13 (*) - - +MIXMXRT1050-EVKB D10/-/D11/D12/D13 (*) - - +MIXMXRT1060-EVK D10/-/D11/D12/D13 (*) - - +MIXMXRT1064-EVK D10/-/D11/D12/D13 (*) - - +MIXMXRT1170-EVK D10/-/D11/D12/D13 D28/-/D25/D24/D26 -/-/D14/D15/D24 +Olimex RT1010Py - CS0/-/SDO/SDI/SCK SDCARD with CS1 +Seeed ARCH MIX J4_12/-/J4_14/J4_13/J4_15 J3_09/J3_05/J3_08_J3_11 +================= ========================= ======================= =============== + +Pins denoted with (*) are by default not wired at the board. + +Hardware SPI is accessed via the :ref:`machine.SPI <machine.SPI>` class and +has the same methods as software SPI above:: + + from machine import SPI + + spi = SPI(0, 10000000) + spi.write('Hello World') + +Notes: + +1. Even if the highest supported baud rate at the moment is 90 Mhz, + setting a baud rate will not always result in exactly that + frequency, especially at high baud rates. + +2. Sending at 90 MHz is possible, but in the tests receiving + only worked up to 60 MHz. + +Software I2C bus +---------------- + +Software I2C (using bit-banging) works on all output-capable pins, and is +accessed via the :ref:`machine.SoftI2C <machine.SoftI2C>` class:: + + from machine import Pin, SoftI2C + + i2c = SoftI2C(scl=Pin(5), sda=Pin(4), freq=100000) + + i2c.scan() # scan for devices + + i2c.readfrom(0x3a, 4) # read 4 bytes from device with address 0x3a + i2c.writeto(0x3a, '12') # write '12' to device with address 0x3a + + buf = bytearray(10) # create a buffer with 10 bytes + i2c.writeto(0x3a, buf) # write the given buffer to the slave + +The highest supported freq is 400000. + +Hardware I2C bus +---------------- + +There are up to four hardware I2C channels that allow faster transmission rates +and support the full I2C protocol. The I2C signals have fixed assignments to GPIO pins. +It depends on the board design, which I2C's signals are exposed to the user, as +detailed in the table below. The signal order in the table is: SDA, SCL. + +================= =========== =========== =========== ======= ======= +Board / Pin I2C 0 I2C 1 I2C 2 I2C 3 I2C 4 +================= =========== =========== =========== ======= ======= +Teensy 4.0 18/19 17/16 25/24 - - +Teensy 4.1 18/19 17/16 25/24 - - +MIXMXRT1010-EVK D14/D15 D0/D1 - - - +MIXMXRT1015-EVK D14/D15 - - - - +MIXMXRT1020-EVK D14/D15 A4/A5 D0/D1 - - +MIXMXRT1050-EVK A4/A5 D1/D0 - - - +MIXMXRT1050-EVKB A4/A5 D1/D0 - - - +MIXMXRT1060-EVK A4/A5 D1/D0 - - - +MIXMXRT1064-EVK A4/A5 D1/D0 - - - +MIXMXRT1170-EVK D14/D15 D1/D0 A4/A5 D26/D25 D19/D18 +Olimex RT1010Py - SDA1/SCL1 SDA2/SCL2 - - +Seeed ARCH MIX J3_17/J3_16 J4_06/J4_07 J5_05/J5_04 - - +================= =========== =========== =========== ======= ======= + +Hardware I2C is accessed via the :ref:`machine.I2C <machine.I2C>` class and +has the same methods as software SPI above:: + + from machine import I2C + + i2c = I2C(0, 400_000) + i2c.writeto(0x76, b"Hello World") + +I2S bus +------- + +See :ref:`machine.I2S <machine.I2S>`. Example using a Teensy 4.1 board with a simple +external Codec like UDA1334.:: + + from machine import I2S, Pin + i2s = I2S(2, sck=Pin(26), ws=Pin(27), sd=Pin(7), + mode=I2S.TX, bts=16,format=I2S.STEREO, + rate=44100,ibuf=40000) + i2s.write(buf) # write buffer of audio samples to I2S device + + +Example for using I2S with a MIMXRT10xx_DEV board:: + + from machine import I2S, I2C, Pin + import wm8960 + + i2c=I2C(0) + + wm=wm8960.WM8960(i2c, sample_rate=SAMPLE_RATE_IN_HZ, + adc_sync=wm8960.sync_dac, + swap=wm8960.swap_input) + + i2s = I2S(1, sck=Pin("SCK_TX"), ws=Pin("WS_TX"), sd=Pin("SD_RX"), + mck=Pin("MCK),mode=I2S.RX, bts=16,format=I2S.MONO, + rate=32000,ibuf=10000) + i2s.readinto(buf) # fill buffer with audio samples from I2S device + +In this example, the input channels are swapped in the WM8960 driver, since the +on-board microphone is connected to the right channel, but mono audio is taken +from the left channel. Note, that the sck and ws pins are connected to the TX +signals of the I2S bus. That is intentional, since at the MW8960 codec these +signals are shared for RX and TX. + +Example using the Teensy audio shield:: + + from machine import I2C, I2S, Pin + from sgtl5000 import CODEC + i2s = I2S(1, sck=Pin(21), ws=Pin(20), sd=Pin(7), mck=Pin(23), + mode=I2S.TX, bits=16,rate=44100,format=I2S.STEREO, + ibuf=40000, + ) + + # configure the SGTL5000 codec + i2c = I2C(0, freq=400000) + codec = CODEC(0x0A, i2c) + codec.mute_dac(False) + codec.dac_volume(0.9, 0.9) + codec.headphone_select(0) + codec.mute_headphone(False) + codec.volume(0.7, 0.7) + + i2s.write(buf) # write buffer of audio samples to I2S device + +The SGTL5000 codec used by the Teensy Audio shield uses the RX signals for both +RX and TX. Note that the codec is initialized after the I2S device. That is +essential since MCK is needed for its I2C operation and is provided by the I2S +controller. + +MIMXRT boards may have 1 or 2 I2S buses available at the board connectors. +On MIMXRT1010 devices the bus numbers are 1 and 3. + +Pin assignments for a few MIMXRT boards: + +=============== == ===== ======== ======= ======= ======== ======= ======= +Board ID MCK SCK_TX WS_TX SD_TX SCK_RX WS_RX SD_RX +=============== == ===== ======== ======= ======= ======== ======= ======= +Teensy 4.0 1 23 26 27 7 21 20 8 +Teensy 4.0 2 33 4 3 2 - - 5 +Teensy 4.1 1 23 26 27 7 21 20 8 +Teensy 4.1 2 33 4 3 2 - - 5 +Seeed Arch MIX 1 J4_09 J4_14 J4_15 J14_13 J4_11 J4_10 J4_10 +Olimex RT1010Py 1 D8 D6 D7 D4 D1 D2 D3 +Olimex RT1010Py 3 - D10 D9 D11 - - - +MIMXRT_DEV 1 "MCK" "SCK_TX" "WS_TX" "SD_TX" "SCK_RX" "WS_RX" "SD_RX" +=============== == ===== ======== ======= ======= ======== ======= ======= + +Symbolic pin names are provided for the MIMXRT_10xx_DEV boards. +These are provided for the other boards as well. + +Real time clock (RTC) +--------------------- + +See :ref:`machine.RTC <machine.RTC>`:: + + from machine import RTC + + rtc = RTC() + rtc.datetime((2017, 8, 23, 1, 12, 48, 0, 0)) # set a specific date and time + rtc.datetime() # get date and time + rtc.now() # return date and time in CPython format. + +The i.MXRT MCU supports battery backup of the RTC. By connecting a battery of +1.5-3.6V, time and date are maintained in the absence of the main power. The +current drawn from the battery is ~20µA, which is rather high. A CR2032 coin +cell will last for about one year. + +SD card +------- + +See :ref:`machine.SDCard <machine.SDCard>`:: + + import machine, os + + sd = machine.SDCard() + fs = os.VfsFat(sd) + os.mount(fs, "/sd") # mount + os.listdir('/sd') # list directory contents + os.umount('/sd') # eject + +Note: The i.mx-rt 1011 and 1015 based boards do not support the ``machine.SDCard`` +class. For these, the SPI based driver ``sdcard.py`` from the MicroPython drivers +can be used. When using it, you have to overdrive the CS pin of the SPI hardware +module. Example:: + + import os, sdcard, machine + + cs_pin = "D10" + spi = machine.SPI(0) # SPI0 with cs at Pin "D10" used for SDCARD + cs = machine.Pin(cs_pin, machine.Pin.OUT, value=1) + sd = sdcard.SDCard(spi, cs) + vfs = os.VfsFat(sd) + os.mount(vfs, "/sdcard") + +OneWire driver +-------------- + +The OneWire driver is implemented in software and works on all pins:: + + from machine import Pin + import onewire + + ow = onewire.OneWire(Pin(12)) # create a OneWire bus on GPIO12 + ow.scan() # return a list of devices on the bus + ow.reset() # reset the bus + ow.readbyte() # read a byte + ow.writebyte(0x12) # write a byte on the bus + ow.write('123') # write bytes on the bus + ow.select_rom(b'12345678') # select a specific device by its ROM code + +There is a specific driver for DS18S20 and DS18B20 devices:: + + import time, ds18x20 + ds = ds18x20.DS18X20(ow) + roms = ds.scan() + ds.convert_temp() + time.sleep_ms(750) + for rom in roms: + print(ds.read_temp(rom)) + +Be sure to put a 4.7k pull-up resistor on the data line. Note that +the ``convert_temp()`` method must be called each time you want to +sample the temperature. + +DHT driver +---------- + +The DHT driver is implemented in software and works on all pins:: + + import dht + import machine + + d = dht.DHT11(machine.Pin(4)) + d.measure() + d.temperature() # eg. 23 (°C) + d.humidity() # eg. 41 (% RH) + + d = dht.DHT22(machine.Pin(4)) + d.measure() + d.temperature() # eg. 23.6 (°C) + d.humidity() # eg. 41.3 (% RH) + +Be sure to have a 4.7k pull-up resistor on the data line. Some +DHT modules may already have one. + +Ethernet driver +--------------- + +All MIMXRT boards except the MIMXRT1011 based boards and Teensy 4.0 support +Ethernet. Example usage:: + + import network + + lan = network.LAN(0) + lan.active(True) + +If there is a DHCP server in the LAN, the IP address is supplied by that server. +Otherwise, the IP address can be set with lan.ifconfig(). The default address +is 192.168.0.1. + +Teensy 4.1 does not have an Ethernet jack on the board, but PJRC offers an +adapter for self-assembly. The Seeed ARCH MIX board has no PHY hardware on the +board, however you can attach external PHY interfaces. By default, the firmware +for Seeed Arch Mix uses the driver for a LAN8720 PHY. The MIMXRT1170_EVK is +equipped with two Ethernet ports, which are addressed as LAN(0) for the 100M +port and LAN(1) for the 1G port. + +For details of the network interface refer to the class :ref:`network.LAN <network.LAN>`. + +Transferring files +------------------ + +Files can be transferred to the i.MXRT devices for instance with the ``mpremote`` +tool or using an SD card. If Ethernet is available, you can also use ftp. +See the MicroPython forum for the FTP server or other community-supported +alternatives to transfer files to an i.MXRT board, like rshell or Thonny. |