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atusb/fw/usb/: enable MCU reset on USB bus reset after config selection

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This way the host can reset the MCU if it's hung (for example, in the
panic loop) and we don't need to unplug-replug.
This commit is contained in:
Werner Almesberger
2013-04-01 15:54:44 -03:00
parent 65722d417a
commit 9b2696b848
3 changed files with 8 additions and 1 deletions
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7
atusb/fw/usb/atu2.c
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@@ -247,6 +247,12 @@ void usb_reset(void)
}
void usb_enable_bus_reset(void)
{
UDCON |= 1 << RSTCPU; /* reset CPU on bus reset */
}
void usb_init(void)
{
USBCON |= 1 << FRZCLK; /* freeze the clock */
@@ -263,7 +269,6 @@ void usb_init(void)
UDCON &= ~(1 << DETACH); /* attach the pull-up */
UDIEN = 1 << EORSTE; /* enable device interrupts */
// UDCON |= 1 << RSTCPU; /* reset CPU on bus reset */
ep_init();
}

1
atusb/fw/usb/usb.c
View File

@@ -118,6 +118,7 @@ bool handle_setup(const struct setup_request *setup)
case TO_DEVICE(SET_CONFIGURATION):
if (setup->wValue != config_descriptor[5])
return 0;
usb_enable_bus_reset();
break;
/*

1
atusb/fw/usb/usb.h
View File

@@ -153,6 +153,7 @@ bool handle_setup(const struct setup_request *setup);
void set_addr(uint8_t addr);
void usb_ep_change(struct ep_descr *ep);
void usb_reset(void);
void usb_enable_bus_reset(void);
void usb_init(void);
#endif /* !USB_H */