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  • Cooped-Up
  • Cooped-Up
19 Jun 2025 10:38
Replied by Cooped-Up on topic Mesa card issues Maho MH800E Retrofit Project

Mesa card issues Maho MH800E Retrofit Project

Category: Computers and Hardware

So I tried to upload the firmware and I have somehow broken the 5i25t as it no longer is recognized by the computer. is this something I can flash an eprom with a programmer?
  • meister
  • meister
19 Jun 2025 09:44
Replied by meister on topic LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Category: Computers and Hardware

there is no real protocol,
it is a frame with a fixed length (depending on the config) in which all necessary data is sent and received in byte blocks.

Here is an example of the default Tangbob config:
cat Output/Tangbob/DOC/INTERFACE.md
# Interface
## Host to FPGA
| POS | SIZE | NAME |
| --- | --- | --- |
| 0 | 32bits | RX_HEADER |
| 32 | 128bits | VAROUT128_MODBUS0_TXDATA |
| 160 | 32bits | VAROUT32_PWMOUT0_DTY |
| 192 | 32bits | VAROUT32_STEPDIR0_VELOCITY |
| 224 | 32bits | VAROUT32_STEPDIR1_VELOCITY |
| 256 | 32bits | VAROUT32_STEPDIR2_VELOCITY |
| 288 | 32bits | VAROUT32_STEPDIR3_VELOCITY |
| 320 | 1bit | VAROUT1_WLED0_0_GREEN |
| 321 | 1bit | VAROUT1_WLED0_0_BLUE |
| 322 | 1bit | VAROUT1_WLED0_0_RED |
| 323 | 1bit | VAROUT1_BITOUT0_BIT |
| 324 | 1bit | VAROUT1_BITOUT1_BIT |
| 325 | 1bit | VAROUT1_PWMOUT0_ENABLE |
| 326 | 1bit | VAROUT1_STEPDIR0_ENABLE |
| 327 | 1bit | VAROUT1_STEPDIR1_ENABLE |
| 328 | 1bit | VAROUT1_STEPDIR2_ENABLE |
| 329 | 1bit | VAROUT1_STEPDIR3_ENABLE |

## FPGA to Host
| POS | SIZE | NAME |
| --- | --- | --- |
| 0 | 32bits | TX_HEADER |
| 32 | 32bits | TIMESTAMP |
| 64 | 16bits | MULTIPLEXED_INPUT_VALUE |
| 80 | 8bits | MULTIPLEXED_INPUT_ID |
| 88 | 128bits | VARIN128_MODBUS0_RXDATA |
| 216 | 32bits | VARIN32_STEPDIR0_POSITION |
| 248 | 32bits | VARIN32_STEPDIR1_POSITION |
| 280 | 32bits | VARIN32_STEPDIR2_POSITION |
| 312 | 32bits | VARIN32_STEPDIR3_POSITION |
| 344 | 1bit | VARIN1_BITIN0_BIT |
| 345 | 1bit | VARIN1_BITIN1_BIT |
| 346 | 1bit | VARIN1_BITIN2_BIT |
| 347 | 1bit | VARIN1_BITIN3_BIT |
| 348 | 1bit | VARIN1_BITIN4_BIT |

the frames are then filled with zeros so that they are always divisible by 8 bits and RX and TX frames have the same length so that they can be transmitted via SPI full duplex

a hal component (riocomp.c) is also generated for each config, which can read and write the frames and, if necessary, does a few floating point calculations that I wanted to keep away from the FPGA

This makes it possible to manage without SoftCore in the FPGA, i.e. only pure logic


 
  • pippin88
  • pippin88
19 Jun 2025 08:47
Replied by pippin88 on topic How to jog when beyond soft limits

How to jog when beyond soft limits

Category: EtherCAT

I can see you issue and agree that a better solution is needed for absolute encoder setups.

Maybe two sets of software limits are needed?
Working area
Absolute maximum travel
If machine is within "working area" travel/jogging outside is needed
If machine is outside "working area" but within "absolute maximum travel", then allow jogging. Once within "working area" don't allow jogging/movement back out

Work around:
Move machine off soft limits on shut-down
forum.linuxcnc.org/49-basic-configuratio...tion-shutdown#226443
  • slowpoke
  • slowpoke
19 Jun 2025 07:34 - 19 Jun 2025 07:34
Emulating lathe compound angle via manipulation of X & Z drives was created by slowpoke

Emulating lathe compound angle via manipulation of X & Z drives

Category: HAL Examples

Axis GUI for a lathe, using Mesa 
I have servos driving the X (cross slide), and Z (carriage) all working.
I also have MPG to manipulate X & Z.
I have removed my compound to make the lathe more rigid, with the rationale that I can emulate the compound via correct step pulse generation of the X & Z drives via the MPG.

Has someone done this?
HAL example?

Thank you

 
  • tivoi
  • tivoi's Avatar
19 Jun 2025 05:45
Replied by tivoi on topic LinuxCNC MillTurn

LinuxCNC MillTurn

Category: General LinuxCNC Questions

File Attachment:


solution for spindle/c axis

www.cnccookbook.com/c-axis-turning-and-l...ling-on-one-machine/
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