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Reset USB peripheral and wait for startup

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Scott Shawcroft 2018-11-14 09:46:46 -08:00
parent a1c596490a
commit 6aa0146c72
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GPG Key ID: FD0EDC4B6C53CA59
2 changed files with 19 additions and 2 deletions
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11
src/portable/microchip/samd21/dcd_samd21.c
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@ -71,10 +71,19 @@ static void bus_reset(void) {
*------------------------------------------------------------------*/
bool dcd_init (uint8_t rhport)
{
// Reset to get in a clean state.
USB->DEVICE.CTRLA.bit.SWRST = true;
while (USB->DEVICE.SYNCBUSY.bit.SWRST == 0) {
}
while (USB->DEVICE.SYNCBUSY.bit.SWRST == 1) {}
(void) rhport;
USB->DEVICE.DESCADD.reg = (uint32_t) &sram_registers;
USB->DEVICE.CTRLB.reg = USB_DEVICE_CTRLB_SPDCONF_FS;
USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE;
USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE | USB_CTRLA_RUNSTDBY;
while (USB->DEVICE.SYNCBUSY.bit.ENABLE == 1) {}
USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_SOF | USB_DEVICE_INTENSET_EORST;
return true;

10
src/portable/microchip/samd51/dcd_samd51.c
View File

@ -72,9 +72,17 @@ static void bus_reset(void) {
bool dcd_init (uint8_t rhport)
{
(void) rhport;
// Reset to get in a clean state.
USB->DEVICE.CTRLA.bit.SWRST = true;
while (USB->DEVICE.SYNCBUSY.bit.SWRST == 0) {
}
while (USB->DEVICE.SYNCBUSY.bit.SWRST == 1) {}
USB->DEVICE.DESCADD.reg = (uint32_t) &sram_registers;
USB->DEVICE.CTRLB.reg = USB_DEVICE_CTRLB_SPDCONF_FS;
USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE;
USB->DEVICE.CTRLA.reg = USB_CTRLA_MODE_DEVICE | USB_CTRLA_ENABLE | USB_CTRLA_RUNSTDBY;
while (USB->DEVICE.SYNCBUSY.bit.ENABLE == 1) {}
USB->DEVICE.INTENSET.reg = USB_DEVICE_INTENSET_SOF | USB_DEVICE_INTENSET_EORST;
return true;