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Reassert DCD after DTR is written. Fixes #41.

This commit is contained in:
Gareth McMullin 2015-03-11 05:45:43 -07:00
parent f9d484d506
commit 7c1c19881f
1 changed files with 20 additions and 13 deletions
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33
src/platforms/common/cdcacm.c
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@ -49,6 +49,7 @@ usbd_device * usbdev;
static int configured;
static int cdcacm_gdb_dtr = 1;
static void cdcacm_set_modem_state(usbd_device *dev, int iface, bool dsr, bool dcd);
static const struct usb_device_descriptor dev = {
.bLength = USB_DT_DEVICE_SIZE,
@ -430,6 +431,7 @@ static int cdcacm_control_request(usbd_device *dev,
return 1;
cdcacm_gdb_dtr = req->wValue & 1;
cdcacm_set_modem_state(dev, 0, true, true);
return 1;
case USB_CDC_REQ_SET_LINE_CODING:
@ -476,6 +478,23 @@ int cdcacm_get_dtr(void)
return cdcacm_gdb_dtr;
}
static void cdcacm_set_modem_state(usbd_device *dev, int iface, bool dsr, bool dcd)
{
char buf[10];
struct usb_cdc_notification *notif = (void*)buf;
/* We echo signals back to host as notification */
notif->bmRequestType = 0xA1;
notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
notif->wValue = 0;
notif->wIndex = iface;
notif->wLength = 2;
buf[8] = (dsr ? 2 : 0) | (dcd ? 1 : 0);
buf[9] = 0;
usbd_ep_write_packet(dev, 0x82, buf, 10);
notif->wIndex = 2;
usbd_ep_write_packet(dev, 0x84, buf, 10);
}
static void cdcacm_set_config(usbd_device *dev, uint16_t wValue)
{
configured = wValue;
@ -513,19 +532,7 @@ static void cdcacm_set_config(usbd_device *dev, uint16_t wValue)
/* Notify the host that DCD is asserted.
* Allows the use of /dev/tty* devices on *BSD/MacOS
*/
char buf[10];
struct usb_cdc_notification *notif = (void*)buf;
/* We echo signals back to host as notification */
notif->bmRequestType = 0xA1;
notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
notif->wValue = 0;
notif->wIndex = 0;
notif->wLength = 2;
buf[8] = 3; /* DCD | DSR */
buf[9] = 0;
usbd_ep_write_packet(dev, 0x82, buf, 10);
notif->wIndex = 2;
usbd_ep_write_packet(dev, 0x84, buf, 10);
cdcacm_set_modem_state(dev, 0, true, true);
}
/* We need a special large control buffer for this device: */