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core/usb: avoid naks in hid/webusb rx interfaces

Browse Source
pull/789/head
Jan Pochyla 4 years ago
parent 6afff3cc0e
commit ecc4313a34
3 changed files with 28 additions and 54 deletions
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14
core/embed/trezorhal/usb.c
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@ -179,20 +179,6 @@ static void usb_desc_add_iface(size_t desc_len) {
usb_config_desc->wTotalLength);
}
static uint8_t usb_ep_set_nak(USBD_HandleTypeDef *dev, uint8_t ep_num) {
PCD_HandleTypeDef *hpcd = dev->pData;
USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
USBx_OUTEP(ep_num)->DOEPCTL |= USB_OTG_DOEPCTL_SNAK;
return USBD_OK;
}
static uint8_t usb_ep_clear_nak(USBD_HandleTypeDef *dev, uint8_t ep_num) {
PCD_HandleTypeDef *hpcd = dev->pData;
USB_OTG_GlobalTypeDef *USBx = hpcd->Instance;
USBx_OUTEP(ep_num)->DOEPCTL |= USB_OTG_DOEPCTL_CNAK;
return USBD_OK;
}
/*
* USB interface implementations
*/

34
core/embed/trezorhal/usb_hid-impl.h
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@ -158,20 +158,23 @@ int usb_hid_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
if (iface->type != USB_IFACE_TYPE_HID) {
return -2; // Invalid interface type
}
usb_hid_state_t *state = &iface->hid;
volatile usb_hid_state_t *state = &iface->hid;
// Copy maximum possible amount of data and truncate the buffer length
if (len < state->last_read_len) {
// Copy maximum possible amount of data
uint32_t last_read_len = state->last_read_len;
if (len < last_read_len) {
return 0; // Not enough data in the read buffer
}
len = state->last_read_len;
memcpy(buf, state->rx_buffer, last_read_len);
// Reset the length to indicate we are ready to read next packet
state->last_read_len = 0;
memcpy(buf, state->rx_buffer, len);
// Clear NAK to indicate we are ready to read more data
usb_ep_clear_nak(&usb_dev_handle, state->ep_out);
// Prepare the OUT EP to receive next packet
USBD_LL_PrepareReceive(&usb_dev_handle, state->ep_out, state->rx_buffer,
state->max_packet_len);
return len;
return last_read_len;
}
int usb_hid_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
@ -182,7 +185,7 @@ int usb_hid_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
if (iface->type != USB_IFACE_TYPE_HID) {
return -2; // Invalid interface type
}
usb_hid_state_t *state = &iface->hid;
volatile usb_hid_state_t *state = &iface->hid;
if (state->ep_in_is_idle == 0) {
return 0; // Last transmission is not over yet
@ -344,17 +347,8 @@ static void usb_hid_class_data_in(USBD_HandleTypeDef *dev,
static void usb_hid_class_data_out(USBD_HandleTypeDef *dev,
usb_hid_state_t *state, uint8_t ep_num) {
if (ep_num == state->ep_out) {
// Save the report length to indicate we have read something, but don't
// schedule next reading until user reads this one
state->last_read_len = USBD_LL_GetRxDataSize(dev, ep_num);
// Prepare the OUT EP to receive next packet
// User should provide state->rx_buffer that is big enough for
// state->max_packet_len bytes
USBD_LL_PrepareReceive(dev, ep_num, state->rx_buffer,
state->max_packet_len);
if (state->last_read_len > 0) {
// Block the OUT EP until we process received data
usb_ep_set_nak(dev, ep_num);
}
}
}

34
core/embed/trezorhal/usb_webusb-impl.h
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@ -134,20 +134,23 @@ int usb_webusb_read(uint8_t iface_num, uint8_t *buf, uint32_t len) {
if (iface->type != USB_IFACE_TYPE_WEBUSB) {
return -2; // Invalid interface type
}
usb_webusb_state_t *state = &iface->webusb;
volatile usb_webusb_state_t *state = &iface->webusb;
// Copy maximum possible amount of data and truncate the buffer length
if (len < state->last_read_len) {
// Copy maximum possible amount of data
uint32_t last_read_len = state->last_read_len;
if (len < last_read_len) {
return 0; // Not enough data in the read buffer
}
len = state->last_read_len;
memcpy(buf, state->rx_buffer, last_read_len);
// Reset the length to indicate we are ready to read next packet
state->last_read_len = 0;
memcpy(buf, state->rx_buffer, len);
// Clear NAK to indicate we are ready to read more data
usb_ep_clear_nak(&usb_dev_handle, state->ep_out);
// Prepare the OUT EP to receive next packet
USBD_LL_PrepareReceive(&usb_dev_handle, state->ep_out, state->rx_buffer,
state->max_packet_len);
return len;
return last_read_len;
}
int usb_webusb_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
@ -158,7 +161,7 @@ int usb_webusb_write(uint8_t iface_num, const uint8_t *buf, uint32_t len) {
if (iface->type != USB_IFACE_TYPE_WEBUSB) {
return -2; // Invalid interface type
}
usb_webusb_state_t *state = &iface->webusb;
volatile usb_webusb_state_t *state = &iface->webusb;
state->ep_in_is_idle = 0;
USBD_LL_Transmit(&usb_dev_handle, state->ep_in, UNCONST(buf), (uint16_t)len);
@ -268,17 +271,8 @@ static void usb_webusb_class_data_out(USBD_HandleTypeDef *dev,
usb_webusb_state_t *state,
uint8_t ep_num) {
if (ep_num == state->ep_out) {
// Save the report length to indicate we have read something, but don't
// schedule next reading until user reads this one
state->last_read_len = USBD_LL_GetRxDataSize(dev, ep_num);
// Prepare the OUT EP to receive next packet
// User should provide state->rx_buffer that is big enough for
// state->max_packet_len bytes
USBD_LL_PrepareReceive(dev, ep_num, state->rx_buffer,
state->max_packet_len);
if (state->last_read_len > 0) {
// Block the OUT EP until we process received data
usb_ep_set_nak(dev, ep_num);
}
}
}

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