RE: Modifying USB CDC example

Mohammad — Wed, 16 Oct 2019 11:43:54 GMT

Hi Calculon,

Is there any update in USB CCID class implementation. Have you completed it?

Pls let me know that.

RE: Modifying USB CDC example

Calculon — Tue, 11 Dec 2018 15:19:11 GMT

Okay, coming back to answer my own question.

If you add -H parameter to Optimization flags like

# Optimization flags
OPT = -O3 -g3 -H

Then recompile the code. You will get a failure during linking, but then you can go to `_build` folder and open main.c.o file with your text editor and it will contain C code with all macros and definitions evaluated and expanded.

In case anyone is interested what does m_app_cdc_acm look like after evaluating macro, here it is;

static uint8_t m_app_ccid_ep =  { ((((NRF_DRV_USBD_EPIN2) >> 16) & 0x01) ? (((NRF_DRV_USBD_EPIN2) & 0xFF00) >> 8) : 0x10) };
static app_usbd_cdc_acm_data_t m_app_ccid_data; 
const app_usbd_cdc_acm_t m_app_ccid = 
{ 
    .specific = 
    { 
        .p_data = &m_app_ccid_data, 
        .p_class_methods = &app_usbd_cdc_acm_class_methods, 
        .iface = 
        { 
            .cnt = 2, 
            .config = 
            { 
                { 
                    .number = 0, 
                    .ep_cnt = 1, 
                    .ep_offset = (0 ) * sizeof(app_usbd_class_ep_conf_t) + ((2 - 0) * sizeof(app_usbd_class_iface_conf_t)) 
                }, 
                { 
                    .number = 1, 
                    .ep_cnt = 2, 
                    .ep_offset = (0 + (2 - 1)) * sizeof(app_usbd_class_ep_conf_t) + ((2 - 1) * sizeof(app_usbd_class_iface_conf_t)) 
                }, 
            }, 
            .ep = 
            { 
                {
                    (nrf_drv_usbd_ep_t) (NRF_DRV_USBD_EPIN2)
                }, 
                {
                    (nrf_drv_usbd_ep_t) (NRF_DRV_USBD_EPIN1)}, 
                    {
                        (nrf_drv_usbd_ep_t) (NRF_DRV_USBD_EPOUT1)}, 
            } 
        }, 
        .inst = 
        { 
            .user_ev_handler = cdc_acm_user_ev_handler, 
            .comm_interface = 0, 
            .comm_epin = 0, 
            .data_interface = 1, 
            .data_epin = NRF_DRV_USBD_EPIN1, 
            .data_epout = NRF_DRV_USBD_EPOUT1, 
            .protocol = 0, 
            .p_ep_interval = &m_app_ccid_ep 
        } 
    } 
}
;

I could still use some pointers on how to properly modify cdc example to show up as CCID device. 🙂