SC16IS750 under 4.4.120 kernel CANNOT transmit file to the other pear

[JarvisC]

Hi NXP sir,

We develop SC16IS750 as we RS485 UART data source from our SoC.

We met problem that we can receive the file from other pear

But we cannot transfer the file and get similar time out message on tool

Could you share some suggestion for this problem?

Thanks all

Case	BPS	Direction	Size	Flow control	Result	Message from Tool
1	9600	RX	10K	SW	Pass	EFR=0x0A
2	9600	RX	64B	SW	Pass	EFR=0x0A
3	9600	RX	63B	SW	Pass	EFR=0x0A
4	9600	TX	63B	SW	Fail
5	115200	RX	63B	SW	Pass	EFR=0x0A
6	115200	RX	64B	SW	Pass
7	115200	RX	65B	SW	Pass
8	115200	RX	10K	SW	Fail	Timeout
9	115200	RX	128B	SW	Pass
10	115200	RX	129B	SW	Fail	Timeout
11	115200	RX	192B	SW	Fail	RX FIFO overrun/timeout

[JozefKozon]

Hi Jarvis,

please state your Annual Volume for this project. Please see below an answer from an application engineer I have contacted.

DESCRIPTION

For such as low volume I don’t think we can provide much support. The customer need to debug issue on its own.

1. Hook up a logic analyzer to the I2C or SPI bus and the device TX/RX pins. Watch for the code to send data to the SC16IS750.
2. Does the code that attempt to send the data is correct? Send something sensible like 0, 1, 2, 3, 4, 5
3. Does to code send these data to the transmit FIFO?
4. Does anything come out of the TX pin?
5. Does the TX signal come all the way out to the RS232/485 cable?

Any data the come into the TXFIFO will be automatically send out on the TX pin.’

With Best Regards,

Jozef

[JarvisC]

Hi Jozef,

Please kindly review below information, and share your suggestion.

1. Hook up a logic analyzer to the I2C or SPI bus and the device TX/RX pins. Watch for the code to send data to the SC16IS750.

[4/13,Ans:]We had setting I2C LA for SCL/SDA

1. Does the code that attempt to send the data is correct? Send something sensible like 0, 1, 2, 3, 4, 5

[4/13,Ans:]We had used to type character from keyboard success but cannot transfer file

1. Does to code send these data to the transmit FIFO?

[4/13,Ans:]Should be YES base of above answer we type character is success

1. Does anything come out of the TX pin?

[4/13,Ans:] TX waveform is available on scope, but cannot make sure data incorrect

1. Does the TX signal come all the way out to the RS232/485 cable?

[4/13,Ans:] The TX /RX will connect to level shift and RS485 transceiver

Thanks.

[JozefKozon]

Hi Jarvis,

could you please provide the Annual Volume for your project? Or is the project (and the Annual Volume) not defined yet? 

With Best Regards,

Jozef

[JarvisC]

Hi Jozef,

After checked the Annual Volume for the project, it's about 10k/yr for 5 years.

Thanks.

[JarvisC]

Hi Jozef,

Could you share some suggestion that could help us to fix the problem?

Thanks.

[JarvisC]

Hi Jozef,

Is there any updated information about our questions?

Please help to share your suggestion.

Thanks.

[JozefKozon]

Hi Jarvis,

I apologize for a late reply. We had two days off due to Easter holiday. This morning I have sent your answers to the application engineer. As soon as I will receive an answer from him, I will definitely reply to you.

Thank you for your patience.

With Best Regards,

Jozef

[JozefKozon]

Hi Jarvis,

I have bad news. The application engineer has sent me an answer. Please see below. I apologize for inconvenience.

DESCRIPTION

I can not offer any help without looking at the actual scope shot to show exactly what is happening. As I said before, for such a low volume the customer need to debug his own issue.

With Best Regards,

Jozef