keyboard/kl27z_onekey/README.md

   1 KL27Z128/256 board
   2 ==================
   3 2016/11/30
   4
   5 KL27Z is configured to use internal 48MHz RC oscillator.
   6
   7 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.
   8
   9
  10 ELF board
  11 ---------
  12 ### prototypte pinout
  13 - pcb layout  https://deskthority.net/resources/image/33293
  14 - schematic  https://deskthority.net/resources/image/33252
  15
  16
  17     39 .....  44 \ conn / 1 ..... 6
  18     38           |______|    LED  7
  19      :  Rst                       :
  20      :                            :
  21     32  Bl                        13
  22     31 .........24 23............ 14
  23
  24     1   PTD6        12  PTC3         23  GND        34  PTE20
  25     2   PTD5        13  PTC2         24  PTA18      35  PTA20   Reset
  26     3   PTD4        14  PTC1         25  3.3V       36  PTA3    SWD_DIO
  27     4   PTD3        15  PTC0         26  NMI        37  PTA0    SWD_CLK
  28     5   PTD2        16  PTB17        27  PTA2       38  3.3V
  29     6   PTD1        17  PTB16        28  PTA1       39  GND
  30     7   PTD0        18  PTB3         29  PTE25      40  VBUS    VREGIN
  31     8   PTC7        19  PTB2         30  PTE24      41  USB D-
  32     9   PTC6        20  PTB1         31  PTE30      42  USB D+
  33     10  PTC5        21  PTB0         32  PTE29      43  GND
  34     11  PTC4        22  PTA19        33  PTE21      44  USB Shield
  35
  36 ### ROM bootloader pins
  37 See Reference Manual Chapter 13.
  38
  39     PTA2 LPUART0_TX
  40     PTA1 LPUART0_RX *
  41     PTB0 I2C0_SCL
  42     PTB1 I2C0_SDA
  43     PTC4 SPI0_SS_b *
  44     PTC7 SPI0_MISO
  45     PTC6 SPI0_MOSI
  46     PTC5 SPI0_SCK *
  47
  48 Due to errata e9457, need to pull-up `SPI0_SS_b`(or `SPI0_SCK`) to prevent false detection of SPI.
  49 The errata doesn't refer UART though, `LPUART0_RX` also requires pull-up or down resisitor from experience.
  50 Without resistor it easily false-detects activity on UART interface with finger touch on the pin.
  51
  52
  53
  54
  55 Resources
  56 ---------
  57 ### Deskthority thread
  58 https://deskthority.net/workshop-f7/can-we-design-the-teensy-alternative-for-keyboards-t13662-510.html
  59
  60 ### Kinetis KL2x
  61 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
  62
  63 ### KL27Z128/256 Data Sheet
  64 http://www.nxp.com/assets/documents/data/en/data-sheets/KL27P64M48SF6.pdf
  65
  66 ### KL27Z128/256 Reference Manual
  67 http://www.nxp.com/assets/documents/data/en/reference-manuals/KL27P64M48SF6RM.pdf
  68
  69 ### Errata
  70 http://www.nxp.com/assets/documents/data/en/errata/KINETIS_L_1N71K.pdf
  71
  72 >>
  73 e9457: Kinetis Flashloader/ ROM Bootloader: The peripheral auto-detect code in
  74 bootloader can falsely detect presence of SPI host causing non-responsive
  75 bootloader
  76 Description: During the active peripheral detection process, the bootloader can interpret spurious data on
  77 the SPI peripheral as valid data. The spurious data causes the bootloader to shutdown all
  78 peripherals except the “falsely detected" SPI and enter the command phase loop using the
  79 SPI. After the bootloader enters the command phase loop using the SPI, the other peripherals
  80 are ignored, so the desired peripheral is no longer active.
  81 The bootloader will not falsely detect activity on the I2C, UART, or USB interfaces, so only the
  82 SPI interface is affected.
  83 Workaround: Ensure that there is an external pull-up on the SPI chip-select pin or that the pin is driven high.
  84 This will prevent the bootloader from seeing spurious data due to activity on the SPI clock pin.
  85
  86 ### Kinetis Bootloader and blhost
  87 http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/kinetis-cortex-m-mcus/kinetis-symbols-footprints-and-models/kinetis-bootloader:KBOOT
  88
  89
  90 Build
  91 -----
  92
  93     make
  94
  95
  96 Program
  97 -------
  98 Flash firmware with ROM bootloader.
  99
 100     blhost -u -- flash-image  build/kl27z.hex erase
 101
 102
 103 TODO
 104 ----
 105 - Fix boards/ELF files
 106 - add macro `USBx_CTL_RESUME` to ChibiOS-Contrib/os/common/ext/CMSIS/KINETIS/kl27zxxx.h