Hello, World
Please note that the following questions may be difficult to read as the text was created using a translation tool.
I have downloaded version 17.0.2 of the nrf sdk and obtained the directory nRF5_SDK_17.0.2_d674dde. Then, open examples/peripheral/usbd_cdc_acm/pca10056/blank/ses/usbd_cdc_acm_pca10056.emProject in the directory with SEGGER Embedded Studio for ARM 5.10a The main.c was written to nordic's development kit nRF52840 DK. Then I connected it to a PC via USB and got usb output from the kit. When I wrote the main.c code as downloaded, I was able to confirm that pressing the button on the kit outputs a string as expected.
I wanted to add a 100 ms delay after the usbd process, so I modified part of the program as follows. This modification adds a 100 ms delay by nrf_delay_ms(100) after the usbd process by while (app_usbd_event_queue_process()){}. I wrote this modified code and tried to run it, but communication by usb was not possible (I could not check the usb port with the ls command).
Can I use some other function with delay, sleep, wait, etc., to do the behaviour I expect - a 100 ms delay after the usbd process? Incidentally, I have confirmed that if the delay time is less than 16 ms, it works as I expect.
Thanks!
while (true)
{
while (app_usbd_event_queue_process())
{
// Nothing to do
}
nrf_delay_ms(100); //Delay added
if(m_send_flag)
{
static int frame_counter;
size_t size = sprintf(m_tx_buffer, "Hello USB CDC FA demo: %u\r\n", frame_counter);
ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, m _tx_buffer, size);
if (ret == NRF_SUCCESS)
{
++frame_counter;
}
}
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