I am trying to set up usb cdc and use the virtual COM port for logging. Please find my code below.
Issue - The LED part of the code works fine but when dongle is connected to PC the virtual com p[ort is not enumerated.
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#include <stdbool.h>
#include <stdint.h>
#include "nrf.h"
#include "nrf_delay.h"
#include "nrf_gpio.h"
#include "app_error.h"
#include "app_usbd.h"
#include "app_usbd_cdc_acm.h"
#define LED_GREEN NRF_GPIO_PIN_MAP(0,6)
static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * P_inst,
app_usbd_cdc_acm_user_event_t event);
#define CDC_ACM_COM_INTERFACE 0
#define CDC_ACM_COM_EPIN NRF_DRV_USBD_EPIN2
#define CDC_ACM_DATA_INTERFACE 1
#define CDC_ACM_DATA_EPIN NRF_DRV_USBD_EPIN1
#define CDC_ACM_DATA_EPOUT NRF_DRV_USBD_EPOUT1
APP_USBD_CDC_ACM_GLOBAL_DEF(m_app_cdc_acm,
cdc_acm_user_ev_handler,
CDC_ACM_COM_INTERFACE,
CDC_ACM_DATA_INTERFACE,
CDC_ACM_COM_EPIN,
CDC_ACM_DATA_EPIN,
CDC_ACM_DATA_EPOUT,
APP_USBD_CDC_COMM_PROTOCOL_AT_V250
);
static char m_tx_buffer[NRF_DRV_USBD_EPSIZE];
static void cdc_acm_user_ev_handler(app_usbd_class_inst_t const * P_inst,
app_usbd_cdc_acm_user_event_t event) {
// app_usbd_cdc_acm_t const * p_cdc_acm = app_usbd_cdc_acm_class_get(p_inst);
switch(event) {
case APP_USBD_CDC_ACM_USER_EVT_PORT_OPEN:
break;
case APP_USBD_CDC_ACM_USER_EVT_PORT_CLOSE:
break;
case APP_USBD_CDC_ACM_USER_EVT_TX_DONE :
break;
case APP_USBD_CDC_ACM_USER_EVT_RX_DONE:
break;
}
}
static void usbd_user_ev_handler(app_usbd_event_type_t event) {
switch(event) {
case APP_USBD_EVT_POWER_DETECTED:
if(!nrf_drv_usbd_is_enabled()) {
app_usbd_enable();
}
break;
case APP_USBD_EVT_POWER_REMOVED:
app_usbd_stop();
break;
default:
break;
}
}
/**
* @brief Function for application main entry.
*/
int main(void) {
ret_code_t ret;
static int frame_counter;
static const app_usbd_config_t m_usbd_config = {
.ev_state_proc = usbd_user_ev_handler
};
ret = app_usbd_init(&m_usbd_config);
APP_ERROR_CHECK(ret);
app_usbd_class_inst_t const *class_cdc_acm = app_usbd_cdc_acm_class_inst_get(&m_app_cdc_acm);
ret = app_usbd_class_append(class_cdc_acm);
APP_ERROR_CHECK(ret);
app_usbd_enable();
app_usbd_start();
nrf_gpio_cfg_output(LED_GREEN);
nrf_gpio_pin_set(LED_GREEN);
for (;;) {
nrf_gpio_pin_toggle(LED_GREEN);
nrf_delay_ms(1000);
size_t size = sprintf(m_tx_buffer, "LED is toggled: %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++;
}
}
}
/** @} */