Merge branch 'master' of https://github.com/cprezzi/grbl-LPC

Author: cprezzi

README.md

@@ -4,9 +4,16 @@
 Old releases are in the `Release` tab. See [cprezzi's branch](https://github.com/cprezzi/grbl-LPC) for more recent releases.
 Note: cprezzi's branch disables current control and has defaults more suitable for other boards.
 ***
-This is GRBL 1.1 ported to the LPC1769. It can run on Smoothieboard.
+This is GRBL 1.1 ported to the LPC1769. 
+It can run on the following boards:
+- Smoothieboard
+- Cohesion3D Remix and Mini
+- MKS SBase
+- Azteeg X5 
 
-Usage notes:
+SKR boards don't work, because pin mapping is messed!
+
+**Usage notes:**
 * This uses a different usb-serial driver than Smoothieware. Windows 10 should recognize it automatically.
   If it doesn't, try installing VCOM_lib/usbser.inf.
 * This doesn't pass the sdcard to the host. Once installed you need to use a micro sdcard adaptor to replace or change it.
@@ -28,13 +35,13 @@ New configuration settings
   * Default to 0.0 A to avoid burning out your motors
   * Your motors will likely stall if you don't set these!
 
-Build notes:
+**Build notes:**
 * You should use virtual machines, if you use multiple toolchains on the same PC.
 * Install make if not already there (for Windows see http://gnuwin32.sourceforge.net/packages/make.htm)
 * Install the ARM embeded toolchain (see https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads)
 * Include ```make``` and the ```arm-none-eabi-*``` tools in your path.
 * Run ```git submodule init``` and ```git submodule update``` before building.
-* ```make``` produces 2 files:
+* Run ```make```, which produces 2 files:
   * ```build/firmware.bin```: this is compatible with the sdcard bootloader.
   * ```build/grbl.hex```: this is not compatible with the sdcard bootloader. It loads using Flash Magic 
     and is primarilly for developers who don't want to keep swapping sdcards. If you flash this,

grbl/config.h

@@ -244,6 +244,18 @@
 // not throw an alarm message.
 #define CHECK_LIMITS_AT_INIT
 
+// Open Drain configuration
+// In order to use stepper drivers with optocoupler input, you may need to use
+// open drain configuration. In this configuration,  STEP, DIR, and ENABLE each
+// expose separate positive and negative pins. The positive pins on the driver
+// are tied directly to +5V, and the negative pins are separately routed to the
+// STEP, DIR, and ENABLE pins on the controller board, which function as
+// low-side switches to ground.
+//#define OPEN_DRAIN_X
+//#define OPEN_DRAIN_Y
+//#define OPEN_DRAIN_Z
+//#define OPEN_DRAIN_A
+
 // ---------------------------------------------------------------------------------------
 // ADVANCED CONFIGURATION OPTIONS:
 

grbl/stepper.c

@@ -223,6 +223,65 @@ void st_wake_up()
   // Initialize stepper output bits to ensure first ISR call does not step.
   st.step_outbits = step_port_invert_mask;
 
+  // Set any ports configured as open drain here
+  // https://sites.google.com/site/johnkneenmicrocontrollers/input_output/io_1768
+  // https://sites.google.com/site/johnkneenmicrocontrollers/18b-i2c/i2c_lpc1768#linkC1768
+  #ifdef OPEN_DRAIN_X
+    LPC_PINCON->PINMODE_OD2 |= 1<<0;   // Bit P2.0 is open drain Step
+    LPC_PINCON->PINMODE4 &= ~(3<<0);
+    LPC_PINCON->PINMODE4 |= (2<<0);    // P2.0 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<5;   // Bit P0.5 is open drain Dir
+    LPC_PINCON->PINMODE0 &= ~(3<<10);
+    LPC_PINCON->PINMODE0 |= (2<<10);   // P0.5 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<4;   // Bit P0.4 is open drain Enable
+    LPC_PINCON->PINMODE0 &= ~(3<<8);
+    LPC_PINCON->PINMODE0 |= (2<<8);    // P0.4 has no pull up/down resistor
+  #endif
+
+  #ifdef OPEN_DRAIN_Y
+    LPC_PINCON->PINMODE_OD2 |= 1<<1;   // Bit P2.1 is open drain Step
+    LPC_PINCON->PINMODE4 &= ~(3<<2);
+    LPC_PINCON->PINMODE4 |= (2<<2);    // P2.1 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<11;  // Bit P0.11 is open drain Dir
+    LPC_PINCON->PINMODE0 &= ~(3<<22);
+    LPC_PINCON->PINMODE0 |= (2<<22);   // P0.11 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<10;  // Bit P0.10 is open drain Enable
+    LPC_PINCON->PINMODE0 &= ~(3<<20);
+    LPC_PINCON->PINMODE0 |= (2<<20);   // P0.10 has no pull up/down resistor
+  #endif
+
+  #ifdef OPEN_DRAIN_Z
+    LPC_PINCON->PINMODE_OD2 |= 1<<2;   // Bit P2.2 is open drain Step
+    LPC_PINCON->PINMODE4 &= ~(3<<4);
+    LPC_PINCON->PINMODE4 |= (2<<4);    // P2.2 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<20;  // Bit P0.20 is open drain Dir
+    LPC_PINCON->PINMODE1 &= ~(3<<8);
+    LPC_PINCON->PINMODE1 |= (2<<8);    // P0.20 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<19;  // Bit P0.19 is open drain Enable
+    LPC_PINCON->PINMODE1 &= ~(3<<6);
+    LPC_PINCON->PINMODE1 |= (2<<6);    // P0.19 has no pull up/down resistor
+  #endif
+
+  #ifdef OPEN_DRAIN_A
+    LPC_PINCON->PINMODE_OD2 |= 1<<3;   // Bit P2.3 is open drain Step
+    LPC_PINCON->PINMODE4 &= ~(3<<6);
+    LPC_PINCON->PINMODE4 |= (2<<6);    // P2.2 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<22;  // Bit P0.22 is open drain Dir
+    LPC_PINCON->PINMODE1 &= ~(3<<12);
+    LPC_PINCON->PINMODE1 |= (2<<12);   // P0.22 has no pull up/down resistor
+
+    LPC_PINCON->PINMODE_OD0 |= 1<<21;  // Bit P0.21 is open drain Enable
+    LPC_PINCON->PINMODE1 &= ~(3<<10);
+    LPC_PINCON->PINMODE1 |= (2<<10);   // P0.21 has no pull up/down resistor
+  #endif
+
   // Initialize step pulse timing from settings. Here to ensure updating after re-writing.
   #ifdef STEP_PULSE_DELAY
     // Set total step pulse time after direction pin set. Ad hoc computation from oscilloscope.