Hi all,
I am working with SDK 15.3 (S140 6.10) on ISP1807, which is nRF52840 based.
For my application I needed a USB dongle which works as BLE Central. It is supposed to receive data from BLE and pass it on to PC via COM Port.
I have merged the suitable examples and created the application. It receives packets of 244 bytes from BLE and stores them in a circular buffer with a size of 2440 bytes. At every 5th BLE packet, the new_usb_packet is increased by one and 1220 bytes are sent via COM Port in a single frame. Every time a USB packet is sent new_usb_packet is decreased by one. As long as the algorithm works fine its value changes between 1 and 0.
However it works fine to some point (sometimes for hours, sometimes for couple of minutes) and then gets stuck. I need help to figure out what's wrong. In the main I have the following code.
for (;;)
{
while (app_usbd_event_queue_process());
if(new_usb_packet > 0 && usb_busy == false)
{
ret_code_t ret = app_usbd_cdc_acm_write(&m_app_cdc_acm, &usb_buffer[index], 1220);
if(ret == NRF_ERROR_BUSY)
{
NRF_LOG_INFO("usb_busy = true");
usb_busy = true;
}
else if(ret != NRF_SUCCESS)
{
NRF_LOG_INFO("USB ret != NRF_SUCCESS");
}
else
{
new_usb_packet--;
update_index();
}
}
}
If the write function returns NRF_ERROR_BUSY, usb_busy = true and program does not attempt to send anything before usb_busy = false again. Please see below:
case APP_USBD_CDC_ACM_USER_EVT_TX_DONE:
NRF_LOG_INFO("usb_busy = false");
usb_busy = false;
For a while the write function returns nothing but NRF_SUCCESS. However at some point it returns NRF_ERROR_BUSY and wait for APP_USBD_CDC_ACM_USER_EVT_TX_DONE event couple of times and then APP_USBD_CDC_ACM_USER_EVT_TX_DONE event never occurs again so the code gets stuck. It keep receiving from BLE correctly however does send anything via COM Port since usb_busy = true.This is the output on RTT viewer:
0> <info> app: usb_busy = true
0> <info> app: usb_busy = false
0> <info> app: usb_busy = true
0> <info> app: usb_busy = false
0> <info> app: usb_busy = true
0> <info> app: usb_busy = false
0> <info> app: usb_busy = false
0> <info> app: usb_busy = true
0> <info> app: usb_busy = false
0> <info> app: usb_busy = true
usb_busy is not set back to false ever again..
Is there something wrong with my algorithm or am I missing a configuration or something else? Thanks in advance.
