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stm32f1: Pull the USB D+ line low briefly to signal a device connect 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-10-04 03:50:19 -04:00
parent bc5e961d73
commit b8745bc973
1 changed files with 8 additions and 0 deletions
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8
src/stm32f1/usbserial.c
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@ -10,6 +10,8 @@
#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
#include "sched.h" // DECL_INIT
#include "stm32f1xx.h" // USB
#include "stm32f1xx_ll_gpio.h" // LL_GPIO_SetOutputPin
#include "stm32f1xx_ll_utils.h" // LL_mDelay
/****************************************************************
@ -218,6 +220,12 @@ usb_set_configure(void)
void
usb_init(void)
{
// Pull the D+ pin low briefly to signal a new connection
LL_GPIO_ResetOutputPin(GPIOA, LL_GPIO_PIN_12);
LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_12, LL_GPIO_MODE_OUTPUT);
LL_mDelay(5);
LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_12, LL_GPIO_MODE_FLOATING);
// Setup USB packet memory
btable_configure();