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Chapter 7
In the case of the high-speed capable device presented in Figure 7-2, in order to enable the
7
use of Device_Qualifier and Other_Speed_Configuration descriptors, the function
USBD_CfgOtherSpeed() should be called during the μC/USB-Device initialization.
Listing 2-5 presents the function App_USBD_Init() defined in app_usbd.c . This function
shows an example of the μC/USB-Device initialization sequence. USBD_CfgOtherSpeed()
should be called after the creation of a high-speed and a full-speed configurations with
USBD_CfgAdd() . Listing 7-3 below shows the use USBD_CfgOtherSpeed() based on
Listing 2-5. Error handling is omitted for clarity.
CCPU_BOOLEAN App_USBD_Init (void)
{
CPU_INT08U dev_nbr;
CPU_INT08U cfg_0_fs;
CPU_INT08U cfg_0_hs;
USBD_ERR err;
...
(1)
if (USBD_DrvCfg_<controller>.Spd == USBD_DEV_SPD_HIGH) {
cfg_0_hs = USBD_CfgAdd( dev_nbr, (2)
USBD_DEV_ATTRIB_SELF_POWERED,
100u,
USBD_DEV_SPD_HIGH,
"HS configuration",
&err);
}
cfg_0_fs = USBD_CfgAdd( dev_nbr,
USBD_DEV_ATTRIB_SELF_POWERED,
100u,
USBD_DEV_SPD_FULL,
"FS configuration",
&err);
USBD_CfgOtherSpeed(dev_nbr,
(3)
(4)
cfg_0_hs,
cfg_0_fs,
&err);
return (DEF_OK);
}
Listing 7-3 Use of USBD_CfgOtherSpeed()
104
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