tmk
7 years ago
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keyboard/kl27z_onekey/README.md
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| @@ -7,8 +7,56 @@ KL27Z is configured to use internal 48MHz RC oscillator. | |||
| 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. | |||
| ELF board | |||
| --------- | |||
| ### prototypte pinout | |||
| - pcb layout https://deskthority.net/resources/image/33293 | |||
| - schematic https://deskthority.net/resources/image/33252 | |||
| 39 ..... 44 \ conn / 1 ..... 6 | |||
| 38 |______| LED 7 | |||
| : Rst : | |||
| : : | |||
| 32 Bl 13 | |||
| 31 .........24 23............ 14 | |||
| 1 PTD6 12 PTC3 23 GND 34 PTE20 | |||
| 2 PTD5 13 PTC2 24 PTA18 35 PTA20 Reset | |||
| 3 PTD4 14 PTC1 25 3.3V 36 PTA3 SWD_DIO | |||
| 4 PTD3 15 PTC0 26 NMI 37 PTA0 SWD_CLK | |||
| 5 PTD2 16 PTB17 27 PTA2 38 3.3V | |||
| 6 PTD1 17 PTB16 28 PTA1 39 GND | |||
| 7 PTD0 18 PTB3 29 PTE25 40 VBUS VREGIN | |||
| 8 PTC7 19 PTB2 30 PTE24 41 USB D- | |||
| 9 PTC6 20 PTB1 31 PTE30 42 USB D+ | |||
| 10 PTC5 21 PTB0 32 PTE29 43 GND | |||
| 11 PTC4 22 PTA19 33 PTE21 44 USB Shield | |||
| ### ROM bootloader pins | |||
| See Reference Manual Chapter 13. | |||
| PTA2 LPUART0_TX | |||
| PTA1 LPUART0_RX * | |||
| PTB0 I2C0_SCL | |||
| PTB1 I2C0_SDA | |||
| PTC4 SPI0_SS_b * | |||
| PTC7 SPI0_MISO | |||
| PTC6 SPI0_MOSI | |||
| PTC5 SPI0_SCK * | |||
| Due to errata e9457, need to pull-up `SPI0_SS_b`(or `SPI0_SCK`) to prevent false detection of SPI. | |||
| The errata doesn't refer UART though, `LPUART0_RX` also requires pull-up or down resisitor from experience. | |||
| Without resistor it easily false-detects activity on UART interface with finger touch on the pin. | |||
| Resources | |||
| --------- | |||
| ### Deskthority thread | |||
| https://deskthority.net/workshop-f7/can-we-design-the-teensy-alternative-for-keyboards-t13662-510.html | |||
| ### Kinetis KL2x | |||
| 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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