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 This board acommodates 48QFN chip.
  13
  14 ### prototypte pinout
  15 - pcb layout  https://deskthority.net/resources/image/33293
  16 - schematic  https://deskthority.net/resources/image/33252
  17
  18
  19     39 .....  44 \ conn / 1 ..... 6
  20     38           |______|    LED  7
  21      :  Rst                       :
  22      :                            :
  23     32  Bl                        13
  24     31 .........24 23............ 14
  25
  26     1   PTD6        12  PTC3         23  GND        34  PTE20*
  27     2   PTD5        13  PTC2         24  PTA18      35  PTA20   Reset
  28     3   PTD4        14  PTC1         25  3.3V       36  PTA3    SWD_DIO
  29     4   PTD3*       15  PTC0*        26  PTA4 NMI   37  PTA0    SWD_CLK
  30     5   PTD2*       16  PTB17*       27  PTA2       38  3.3V
  31     6   PTD1*       17  PTB16*       28  PTA1       39  GND
  32     7   PTD0*       18  PTB3*        29  PTE25*     40  VBUS    VREGIN
  33     8   PTC7        19  PTB2*        30  PTE24*     41  USB D-
  34     9   PTC6        20  PTB1         31  PTE30      42  USB D+
  35     10  PTC5        21  PTB0         32  PTE29*     43  GND
  36     11  PTC4        22  PTA19        33  PTE21*     44  USB Shield
  37
  38
  39 TMK KL27Z breakout
  40 ------------------
  41 This board acommodates 48QFN chip.
  42
  43 ### Pinputs
  44
  45     _\ conn /_
  46     1       28
  47     :        :
  48     :  PROG  :
  49     :  RST   :
  50     14      15
  51     ----------
  52
  53     1  VUSB            28  GND
  54     2  VIN VREGIN      27  PTD4
  55     3  PTD5            26  PTC7
  56     4  PTD6            25  PTC6
  57     5  PTD7            24  PTC5
  58     6  PTE0*           23  PTC4
  59
  60     7  3.3V            22  GND
  61     8  PTE30           21  PTC3
  62     9  PTA0 SWD_CLK    20  PTC2
  63     10 PTA1            19  PTC1
  64     11 PTA2            18  PTB1
  65     12 PTA3 SWD_DIO    17  PTB0
  66     13 PTA4 NMI        16  PTA20 Reset
  67     14 PTA18           15  PTA19
  68
  69
  70 #### Pinouts difference between 32QFN and 48QFN
  71 48QFN doesn't have PTE0
  72 32QFN doesn't have PTD0-3, PTC0, PTE20-21,24,25,29, PTB2-3,16,17
  73
  74 ### ROM bootloader pins
  75 See Reference Manual Chapter 13.
  76
  77     PTA2 LPUART0_TX
  78     PTA1 LPUART0_RX *
  79     PTB0 I2C0_SCL
  80     PTB1 I2C0_SDA
  81     PTC4 SPI0_SS_b *
  82     PTC7 SPI0_MISO
  83     PTC6 SPI0_MOSI
  84     PTC5 SPI0_SCK *
  85
  86 Due to errata e9457, need to pull-up `SPI0_SS_b`(or `SPI0_SCK`) to prevent false detection of SPI.
  87 The errata doesn't refer UART though, `LPUART0_RX` also requires pull-up or down resisitor from experience.
  88 Without resistor it easily false-detects activity on UART interface with finger touch on the pin.
  89
  90
  91
  92
  93 Resources
  94 ---------
  95 ### Deskthority thread
  96 https://deskthority.net/workshop-f7/can-we-design-the-teensy-alternative-for-keyboards-t13662-510.html
  97
  98 ### Kinetis KL2x
  99 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
 100
 101 ### KL27Z128/256 Data Sheet
 102 http://www.nxp.com/assets/documents/data/en/data-sheets/KL27P64M48SF6.pdf
 103
 104 ### KL27Z128/256 Reference Manual
 105 http://www.nxp.com/assets/documents/data/en/reference-manuals/KL27P64M48SF6RM.pdf
 106
 107 ### Errata
 108 http://www.nxp.com/assets/documents/data/en/errata/KINETIS_L_1N71K.pdf
 109
 110 >>
 111 e9457: Kinetis Flashloader/ ROM Bootloader: The peripheral auto-detect code in
 112 bootloader can falsely detect presence of SPI host causing non-responsive
 113 bootloader
 114 Description: During the active peripheral detection process, the bootloader can interpret spurious data on
 115 the SPI peripheral as valid data. The spurious data causes the bootloader to shutdown all
 116 peripherals except the “falsely detected" SPI and enter the command phase loop using the
 117 SPI. After the bootloader enters the command phase loop using the SPI, the other peripherals
 118 are ignored, so the desired peripheral is no longer active.
 119 The bootloader will not falsely detect activity on the I2C, UART, or USB interfaces, so only the
 120 SPI interface is affected.
 121 Workaround: Ensure that there is an external pull-up on the SPI chip-select pin or that the pin is driven high.
 122 This will prevent the bootloader from seeing spurious data due to activity on the SPI clock pin.
 123
 124 ### Kinetis Bootloader and blhost
 125 http://www.nxp.com/products/microcontrollers-and-processors/arm-processors/kinetis-cortex-m-mcus/kinetis-symbols-footprints-and-models/kinetis-bootloader:KBOOT
 126
 127
 128 Build
 129 -----
 130
 131     make
 132
 133
 134 Program
 135 -------
 136 Flash firmware with ROM bootloader.
 137
 138     blhost -u -- flash-image  build/kl27z.hex erase
 139
 140
 141 TODO
 142 ----
 143 - Fix boards/ELF files
 144 - add macro `USBx_CTL_RESUME` to ChibiOS-Contrib/os/common/ext/CMSIS/KINETIS/kl27zxxx.h