rs232 serial driver for embedded systems

[ldesp]

this topic addresses questions relative to the integration of the RS232 serial driver in embedded systems with constrained resources (cpu several hundreds of Mips, memory several tenth of Mbytes)

[ldesp]

Hi,

Some parameters have impact on CPU load and memory size.
How have you chosen the values defined in com_coronis_sdk_domain\generic_constants.h and the value of MAX_LISTENER_THREADS
Kinds regards

Lydie

[Thierry CHOMAUD]

Reply of previous response of vmacari

Hello Lydie
The parameter MAX_LISTENER_THREADS does not mean that all the time the driver will create and use a MAX_LISTENER_THREADS of thread. This is the maximal number of threads that will be created to call your Listener call back events. After your user code will exit from callback, the thread will be removed.
In case if your code does not exit from callback handlers (for any reason) and the number of active threads will reach MAX_LISTENER_THREADS, then any future events (like frame reception) will be ignored, and the user code will not receive notifications.

[Thierry CHOMAUD]

Reply of previous response of vmacari

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[Thierry CHOMAUD]

Lydie,

Here are the comments that have been added to constants MAX_DRIVER_NUM and MAX_PROTOCOL_NUM in generic_constants.h. Moreover in the preparing package the max number have been reduced from 32 to 5.

// Maximum number of serial port connection for each serial driver library
// This value could be adapted if the system need a known number of SerialDriver instance

define MAX_DRIVER_NUM 5

// Maximum number of protocol instances for each protocol library
// This value could be adapted if the system need a known number of Protocol instance

define MAX_PROTOCOL_NUM 5

Si of course you can reduce this value to the number of connection you expect to manage.
Concerning the MAX_SPY_NUM, the memory impact is minimal. But this parameter is used only for spy listener feature. So it could be reduced also.