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@@ -7,8 +7,56 @@ KL27Z is configured to use internal 48MHz RC oscillator. |
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The board has push button on PTA4 and LED on PTD7. The button works as 'a' key and the LED as an indicator for capslock. |
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ELF board |
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### prototypte pinout |
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- pcb layout https://deskthority.net/resources/image/33293 |
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- schematic https://deskthority.net/resources/image/33252 |
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39 ..... 44 \ conn / 1 ..... 6 |
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38 |______| LED 7 |
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: Rst : |
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: : |
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32 Bl 13 |
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31 .........24 23............ 14 |
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1 PTD6 12 PTC3 23 GND 34 PTE20 |
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2 PTD5 13 PTC2 24 PTA18 35 PTA20 Reset |
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3 PTD4 14 PTC1 25 3.3V 36 PTA3 SWD_DIO |
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4 PTD3 15 PTC0 26 NMI 37 PTA0 SWD_CLK |
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5 PTD2 16 PTB17 27 PTA2 38 3.3V |
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6 PTD1 17 PTB16 28 PTA1 39 GND |
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7 PTD0 18 PTB3 29 PTE25 40 VBUS VREGIN |
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8 PTC7 19 PTB2 30 PTE24 41 USB D- |
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9 PTC6 20 PTB1 31 PTE30 42 USB D+ |
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10 PTC5 21 PTB0 32 PTE29 43 GND |
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11 PTC4 22 PTA19 33 PTE21 44 USB Shield |
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### ROM bootloader pins |
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See Reference Manual Chapter 13. |
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PTA2 LPUART0_TX |
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PTA1 LPUART0_RX * |
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PTB0 I2C0_SCL |
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PTB1 I2C0_SDA |
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PTC4 SPI0_SS_b * |
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PTC7 SPI0_MISO |
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PTC6 SPI0_MOSI |
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PTC5 SPI0_SCK * |
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Due to errata e9457, need to pull-up `SPI0_SS_b`(or `SPI0_SCK`) to prevent false detection of SPI. |
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The errata doesn't refer UART though, `LPUART0_RX` also requires pull-up or down resisitor from experience. |
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Without resistor it easily false-detects activity on UART interface with finger touch on the pin. |
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Resources |
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--------- |
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### Deskthority thread |
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https://deskthority.net/workshop-f7/can-we-design-the-teensy-alternative-for-keyboards-t13662-510.html |
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### Kinetis KL2x |
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http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/kinetis-cortex-m-mcus/l-series-ultra-low-power-m0-plus/kinetis-kl2x-48-mhz-usb-ultra-low-power-microcontrollers-based-on-arm-cortex-m0-plus:KL2x |
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