VF50 I2C stop sending

Technical Support
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1

I’m using I2C to comunicate with other slave device, after 7 or 8 hours of comunication I2C doesn’t send data anymore and

I2c_Write(m_hi2c, datatosend,nDataToSend)

return always I2C_RW_FAILURE

Even if I reset or restart power on the slave device VF50 continues to send nothing on SDA and SCL, I have to power off VF50 and reinitialize all in order to work again. Also If I close and reopen I2C doesn’t work.

2

What is the context (hardware/software) of your problem ?
G.Grange

3

We are aware that this issue may happen. Did you try to increase the value of pull-up resistors?

We are working on a new library version where we plan to implement some recovery mechanisms but its still not ready.

4

Dear All,

We have I2C issue too, it is may be caused by the same problem?
In details:

Colibry VF50 V1.2 B

  • Bootloader : 1.5 for Vybrid Built Dec 18 2017
  • WIndows CE verion : 6.00
  • VybGpio_GetVersion: 2.5.58538881
  • VybI2c_GetVersion : 2.5.1806677427

We used the latest compatible TdxAllLibraries.DLL for “V1.2 B” downloaded from toradex.com and we found 2 issues in this dll:

  1. public static extern UInt32 VybI2c_Write(IntPtr hPort, IntPtr pbuf, UInt32 numberOfBytes);
    if the “numberOfBytes = 0” it returns 1 instead of 0
  2. public static extern UInt32 VybI2c_Read(IntPtr hPort, byte pbuf, UInt32 numberOfBytes);
    before calling the above VybI2c_Read method first set with VybI2c_SetConfigInt the RegisterAddressSize.
    if the “RegisterAddressSize = 0” it will result failure, because our st33zp24 Crypto IC device will block I2C bus, in a former case with VF50 v1.2 A its return pbuf[0] = 81 response successful.
    Thats means there is an I2C communication issue in the latest VF50 V1.2 B TdxAllLibraries.DLL

Can you check it please?

5

For everybody affected by this issue, a temporary fix is available, please contact support to get a preliminary version.
The official 2.6 release will be include this fix and will be released in the next weeks.