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Diffstat (limited to 'docs/mimxrt/quickref.rst')
| -rw-r--r-- | docs/mimxrt/quickref.rst | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/docs/mimxrt/quickref.rst b/docs/mimxrt/quickref.rst index 49d7befc74..9f1efd4ffc 100644 --- a/docs/mimxrt/quickref.rst +++ b/docs/mimxrt/quickref.rst @@ -122,10 +122,13 @@ See :ref:`machine.UART <machine.UART>`. :: uart1 = UART(1, baudrate=115200) uart1.write('hello') # write 5 bytes uart1.read(5) # read up to 5 bytes + uart1 = UART(baudrate=19200) # open UART 1 at 19200 baud The i.MXRT has up to eight hardware UARTs, but not every board exposes all TX and RX pins for users. For the assignment of Pins to UART signals, -refer to the :ref:`UART pinout <mimxrt_uart_pinout>`. +refer to the :ref:`UART pinout <mimxrt_uart_pinout>`. If the UART ID is +omitted, UART(1) is selected. Then, the keyword +option for baudrate must be used to change it from the default value. PWM (pulse width modulation) ---------------------------- @@ -305,12 +308,15 @@ rates (up to 30Mhz). Hardware SPI is accessed via the cs_pin(0) spi.write('Hello World') cs_pin(1) + spi = SPI(baudrate=4_000_000) # Use SPI(0) at a baudrate of 4 MHz For the assignment of Pins to SPI signals, refer to :ref:`Hardware SPI pinout <mimxrt_spi_pinout>`. The keyword option cs=n can be used to enable the cs pin 0 or 1 for an automatic cs signal. The default is cs=-1. Using cs=-1 the automatic cs signal is not created. In that case, cs has to be set by the script. Clearing that assignment requires a power cycle. +If the SPI ID is omitted, SPI(0) is selected. Then, the keyword +option for baudrate must be used to change it from the default value. Notes: @@ -355,6 +361,10 @@ has the same methods as software SPI above:: i2c = I2C(0, 400_000) i2c.writeto(0x76, b"Hello World") + i2c = I2C(freq=100_000) # use I2C(0) at 100kHz + +If the I2C ID is omitted, I2C(0) is selected. Then, the keyword +option for freq must be used to change the freq from the default value. I2S bus ------- |