wiki:Docs/Prog/Manual/DeviceSupport/*Drivers

Device Drivers

Overview

For testing some device drivers may be loaded or unloaded dynamically or a startup script may be used to automatically load the modules.

DriverModule FilenameDevice NodesDepends on other modules
Mainboard communicationsmnbd-comm.ko/dev/mnbd
/dev/wt1 ..

/dev/wt10
USB Hubisp1520.koi2c-mcf, i2c-core
Keypad/Beepermax734x.ko/dev/cardbeepI2c-mcf, i2c-core

Device driver operation may be tested from command line for some functions, for example:

# echo “A,B,C” > /dev/cardbeep <CR>

Play notes A, B, and C on beeper. (refer to beeper section for more details)

# echo “W” > /dev/wt1 <CR>

Request weight from scale one.

# cat < /dev/wt1 <CR>

Display response to previous request from scale 1 as a weight structure converted to hexadecimal.

01004812B682000000004812B6820003

struct mnbd_wt_struct
{
  unsigned char interval;          (01 – interval 1)
  unsigned char decimal;           (00 – no decimal)
  float grosswt;                   (4812B682 – IEEE floating point value)
  float tarewt;                    (00000000 – IEEE floating point value–tare zero)
  float netwt;                     (4812B682 – IEEE floating point value)
  unsigned char units;             (00 – units)
  unsigned char status;            (03 – status)
};
Last modified 19 months ago Last modified on 04/24/23 18:32:28
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