MKS Robin Nano and MPG

[bullestock]

Hi,

I am trying to enable MPG on the MKS Robin Nano V3.0, using a GPIO pin for mode switching.

I am using PlatformIO with this platform.ini (adapted from one downloaded from the WebBuilder):

# Template for Web Builder, STM32F4xx
#

[platformio]
include_dir = Inc
src_dir = Src

[common]
build_flags =
  -I .
  -I boards
  -I FatFs
  -I FatFs/STM
  -I Drivers/FATFS/Target
  -I Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc
  -I Middlewares/ST/STM32_USB_Device_Library/Core/Inc
  -I USB_DEVICE/App
  -I USB_DEVICE/Target
  -D _USE_IOCTL=1
  -D _USE_WRITE=1
  -D _VOLUMES=1
  -Wl,-u,_printf_float
  -Wl,-u,_scanf_float
lib_deps =
  boards
  bluetooth
  grbl
  keypad
  laser
  motors
  trinamic
  odometer
  openpnp
  fans
  plugins
  FatFs
  sdcard
  spindle
  embroidery
  Drivers/FATFS/App
  Drivers/FATFS/Target
  # USB serial support
  Middlewares/ST/STM32_USB_Device_Library/Core
  Middlewares/ST/STM32_USB_Device_Library/Class
  USB_DEVICE/App
  USB_DEVICE/Target
lib_extra_dirs =
  .
  boards
  FatFs
  Middlewares/ST/STM32_USB_Device_Library
  USB_DEVICE

[eth_networking]
build_flags =
  -I LWIP/App
  -I LWIP/dp83848/Target
  -I Middlewares/Third_Party/LwIP/src/include
  -I Middlewares/Third_Party/LwIP/system
  -I Middlewares/Third_Party/LwIP/src/include/netif
  -I Middlewares/Third_Party/LwIP/src/include/lwip
  -I Drivers/BSP/Components/dp83848
lib_deps =
   networking
   webui
   LWIP/App
   LWIP/dp83848/Target
   Middlewares/Third_Party/LwIP
   Drivers/BSP/Components/dp83848
lib_extra_dirs =

[wiznet_networking]
build_flags =
  -I networking/wiznet
  -I Middlewares/Third_Party/LwIP/src/include
  -I Middlewares/Third_Party/LwIP/system
  -I Middlewares/Third_Party/LwIP/src/include/netif
  -I Middlewares/Third_Party/LwIP/src/include/lwip
lib_deps =
   networking
   webui
   Middlewares/Third_Party/LwIP
lib_extra_dirs =

[env]
platform = ststm32
platform_packages = framework-stm32cubef4
framework = stm32cube
# Do not produce .a files for lib deps (which would prevent them from overriding weak symbols)
lib_archive = no
lib_ldf_mode = off
extra_scripts = post:extra_script.py

[env:mks_robin_nano_30]
board = genericSTM32F407VGT6
board_build.ldscript = STM32F407VGTX_BL48K_FLASH.ld
build_flags = ${common.build_flags}
  -D BOARD_MKS_ROBIN_NANO_30
  -D USE_HAL_DRIVER
  -D STM32F407xx
  -D HSE_VALUE=8000000
  -D HAS_BOOTLOADER
  -D USB_SERIAL_CDC=1
  -D PROBE_ENABLE=1
  -D EEPROM_ENABLE=32
  -D CONTROL_ENABLE=70
  -D SPINDLE0_ENABLE=11
  -D N_SPINDLE=1

lib_deps = ${common.lib_deps}
  eeprom

lib_extra_dirs = ${common.lib_extra_dirs}

and in my_machine.h I have added

#define MPG_ENABLE 1

#if MPG_ENABLE == 1
#define MPG_MODE_PORT           GPIOC
#define MPG_MODE_PIN            5
#undef MPG_STREAM
#define MPG_STREAM 3
#endif

I am unsure if my definition of MPG_STREAM is correct - I want to use UART3 (PB10/11). But it seems as if something is missing:

1. PC5 does not get pulled high by grblHAL.
2. Even if I pull PC5 low or high, the ? status does not include MPG: