lv_init() breaks SEGGER RTT printf

[armandr]

using v9.3.0 DEV, Renesas RA8D1EK GCC implementation.

For some reason, lv_init() on the Renesas RA8D1EK implementation seems to break SEGGER RTT.

Our goal is to use RTT printfs for lvgl logging on custom RA8D1 boards.

In the example below, commenting out lv_init() produces "Hello, World!" lines, but un-commenting it stops all output.

To enable segger RTT, add the SEGGER_RTT folder and common_utils.h from RA8D1 FSP examples. Include common_utils.h in lvgl_thread_entry.c. The output is viewable from rtt viewer app.

void LVGL_thread_entry(void *pvParameters)
{
    FSP_PARAMETER_NOT_USED (pvParameters);
    fsp_err_t err;

    APP_PRINT("\r\nStarting...");
    lv_init();
    while(1){
        APP_PRINT("\r\nHello, World!");
        vTaskDelay(1000);
    }


    board_init();
    ...

[kisvegabor]

Hi,

We are sorry for the late reply.
@uLipe, please take a look at this issue.

[uLipe]

Hmm it seems you need to redirect the standard console IO from Serial0 to RTT, and once you executa the appplication the Serial0 gets bind to the console subsystem making the printf calls to ignore the RTT subsystem.

I will check that soon, thanks for pointing that.