CCS/CC1350: cc1350

maurizio stefani

Part Number: CC1350

Tool/software: Code Composer Studio

hi,

i would like to use the cc1350 uart. I started from the nortos uart echo example.

I am able to send bytes on the uart (I checked with the oscilloscope) using the uart_write call, but when I call the uart_read the procedure does not return.

I am worry that an interrupt occur but I do not see any interrupt procedure, what happen is:

- if the TXD is connected to RXD when I call the uart_read the program will not return (I am using the cc1350 launchpad board in debugging)

- if the TXD is not connected to RXD the uart_read return but clearly with no data.

N.B. I set the pin DIO2 and 3 as uart rx and tx

well:

1) is correct my analysis?

2) can i work with no interrupt (can I have help about it)?

3) any other suggestions?

thank you

maurizio stefani

over 6 years ago

0 Severin Suveren over 6 years ago

TI__Mastermind 23730 points

Hi maurizio,

Which SDK version are you using?

0 maurizio stefani over 6 years ago in reply to Severin Suveren

Prodigy 180 points

HI, thankyou for the answer,

I am using Code Composer Studio 8.2.0

maurizio

0 Severin Suveren over 6 years ago in reply to maurizio stefani

TI__Mastermind 23730 points

CCS is not the SDK. Which SimpleLink CC13x0 SDK version are you using?

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to maurizio stefani

TI__Guru 58425 points

Hi Maurizio,

That is the IDE version, we would need the version of the SDK (the package containing the uartecho example). Also, you say you based it on the the uartecho example, but it is not clear if you have performed any modifications. Could you share some code snippets on what you are doing (or a complete example if possible) that we can look at and try out?

0 maurizio stefani over 6 years ago in reply to Severin Suveren

Prodigy 180 points

I am sorry,
I am using the cc1350 launchpad

thank you
maurizio

0 maurizio stefani over 6 years ago in reply to maurizio stefani

Prodigy 180 points

HI,
please, do you have a working ccs proect acting for input and output? I closed the dio2 and dio3 together to do test
maurizio

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to maurizio stefani

TI__Guru 58425 points

Hi Maurizio,

Yes, the uartecho example is just that. However, simply bridging TX and RX could cause you to lose data as the UART module is not setup to receive data when you are sending it (it could be, but the example does not take this into account).

I would recommend you try the example out by simply connecting to the device using a serial terminal to verify the "echo" functionality.

0 maurizio stefani over 6 years ago in reply to Severin Suveren

Prodigy 180 points

sorry,
I started from a echo example "C:\ti\simplelink_cc13x0_sdk_2_30_00_20\examples\nortos\CC1350STK\drivers\uartecho", in this:
- the dio2 and 3 are not set to output as uart but are generioc io
- when the uart_read call is executed the program does not go ahead

please,
could you supply a fresh copy, working, of that program?

thank you
maurizio

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to maurizio stefani

TI__Guru 58425 points

Hi Maurizio,

Just to clarify, the SDK version in your case is 2.30.00.20 (as you can read in the SimpleLink_cc13x0_sdk_* path) :)
If you are using a CC1350 LaunchPad, you should include the example from the CC1350_LAUNCHXL folder, the would be:
<SDK>\examples\nortos\CC1350_LAUNCHXL\drivers\uartecho

If you want a fresh copy, all you need to do is to delete the project from your CCS workspace (check the "Delete project content on disk" checkbox) and re-import the example again. When doing this, please have a look at the readme file of the example and verify that the example works as described in the file. Do NOT bridge TX and RX, use instead a serial terminal and connect to the LaunchPad serial port.

0 maurizio stefani over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Prodigy 180 points

ok,
I will check later

thank you
maurizio

0 maurizio stefani over 6 years ago in reply to maurizio stefani

Prodigy 180 points

HI,
using program you suggested it works. but
- I am sending a value of a counter, but i receive wrong data.
I wait to complete the init phase putting a breakpoint after that phase finished, and remain with the break set
Than I jumped the dio2 and di03, it is true that during the cc between dio2 and 3 some noise could be produced but the program is stopped and that noise should finish.

please in the following the few instruction i am using:
a=1;
while (1) {
UART_read(uart, &input, 1);
UART_write(uart, &a, 1);
a++;
}
the breakpoint is set where the program increment a (a++ )
could you please help me?

thank you
maurizio

0 maurizio stefani over 6 years ago in reply to maurizio stefani

Prodigy 180 points

HI,
the system is transmitting but the received data are wrong.
I jumped the dio2 and dio3 after init phase finished.
please find attached the short program I am using
/* Loop forever echoing */
a=1;
while (1) {
UART_write(uart, &a, 1);
UART_read(uart, &input, 1);
a++;
}
the breapoint is in line a++

please let me ask:
- the uart_read will return if the data are received or return in any case. I would like to use the return in any case.
could you please help me.

thank you
maurizio

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to maurizio stefani

TI__Guru 58425 points

Hi Maurizio,

You can set "readTimeout" in the UART parameters passed to the UART_open() call. If you set this, the UART_read() call will return following a timeout when operating in blocking mode (as done in the uartecho example).

Best Regards,

Max

0 maurizio stefani over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Prodigy 180 points

HI,
I will try this,
about uart_read, is it working in blocking mode?, if so, can I change it in return any case signalling if there are data? otherwise could you help me to manage the uart_rx using directly the registers ( I mean using "C")?

thank you
maurizio

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to maurizio stefani

TI__Guru 58425 points

Hi Maurizio,

Yes, you can use the driver in "Callback mode", an example of this is given in the driver documentation:

dev.ti.com/.../_u_a_r_t_c_c26_x_x_8h.html

0 maurizio stefani over 6 years ago in reply to IUsedToBeARealPerson (M-W)

Prodigy 180 points

HI,
I understand:
- in blocking the uart_read will not return before receive data or timeout
- in callback mode, the uart_read return immediately, but how can understand if data are present?
please could you give me an example to manage the read phase acting directely on registers?
in other words, do you have the uart_read source (in "C")?, or ate least the action do be done?

thank you

0 IUsedToBeARealPerson (M-W) over 6 years ago in reply to maurizio stefani

TI__Guru 58425 points

Hi Maurizio,

I don't understand what you mean by knowing if data being present? In blocking mode, the function would return (because you received X number of bytes or had a timeout) the number of bytes that was read (if any at all). In callback mode you would also get the actual number of bytes read as an argument in the function.

The driver and all source code is open for you to look at (down to the actual register access in driverlib):

"<SDK>/source/ti/drivers/uart" and "<SDK>/source/ti/devices/cc13x0/driverlib/uart*"

You can look at these if you want to see how the driver operates but I can not give you a "register" only example, you would have to put this together yourself. There is multiple forum posts on how you could use the UART without the TI-RTOS driver that you could look at.

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CCS/CC1350: cc1350