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Adding a secondary HID interface that emulates a keyboard.

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With it, an app can send a password directly to the host, like it is typed by user.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-12-30 01:41:49 +01:00
parent 20bd2c8b41
commit 411755dee4
6 changed files with 99 additions and 13 deletions
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71
src/usb/hid/hid.c
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@@ -93,9 +93,72 @@ uint32_t hid_write(uint16_t size) {
uint16_t send_buffer_size = 0;
bool last_write_result = false;
static uint8_t keyboard_buffer[256];
static uint8_t keyboard_buffer_len = 0;
static const uint8_t conv_table[128][2] = { HID_ASCII_TO_KEYCODE };
static uint8_t keyboard_w = 0;
static bool sent_key = false;
void add_keyboard_buffer(const uint8_t *data, size_t data_len) {
keyboard_buffer_len = MIN(sizeof(keyboard_buffer), data_len);
memcpy(keyboard_buffer, data, keyboard_buffer_len);
}
static void send_hid_report(uint8_t report_id) {
if (!tud_hid_ready())
return;
switch(report_id) {
case REPORT_ID_KEYBOARD: {
if (keyboard_w < keyboard_buffer_len) {
if (sent_key == false) {
uint8_t keycode[6] = { 0 };
uint8_t modifier = 0;
uint8_t chr = keyboard_buffer[keyboard_w];
if (conv_table[chr][0])
modifier = KEYBOARD_MODIFIER_LEFTSHIFT;
keycode[0] = conv_table[chr][1];
if (tud_hid_n_keyboard_report(ITF_KEYBOARD, REPORT_ID_KEYBOARD, modifier, keycode) == true)
sent_key = true;
}
else {
if (tud_hid_n_keyboard_report(ITF_KEYBOARD, REPORT_ID_KEYBOARD, 0, NULL) == true) {
keyboard_w++;
sent_key = false;
}
}
}
else if (keyboard_w == keyboard_buffer_len && keyboard_buffer_len > 0) {
keyboard_w = keyboard_buffer_len = 0;
}
}
break;
default: break;
}
}
void hid_task(void) {
// Poll every 10ms
const uint32_t interval_ms = 10;
static uint32_t start_ms = 0;
if (board_millis() - start_ms < interval_ms)
return;
start_ms += interval_ms;
// Remote wakeup
if ( tud_suspended() && keyboard_buffer_len > 0) {
tud_remote_wakeup();
}
else {
send_hid_report(REPORT_ID_KEYBOARD);
}
}
void tud_hid_report_complete_cb(uint8_t instance, uint8_t const* report, /*uint16_t*/ uint8_t len) {
uint8_t seq = report[4] & TYPE_MASK ? 0 : report[4] + 1;
if (send_buffer_size > 0) {
if (send_buffer_size > 0 && instance == ITF_HID) {
uint8_t seq = report[4] & TYPE_MASK ? 0 : report[4] + 1;
if (last_write_result == true) {
ctap_resp->cid = ctap_req->cid;
ctap_resp->cont.seq = seq;
@@ -108,7 +171,7 @@ void tud_hid_report_complete_cb(uint8_t instance, uint8_t const* report, /*uint1
}
int driver_write_hid(const uint8_t *buffer, size_t buffer_size) {
last_write_result = tud_hid_report(0, buffer, buffer_size);
last_write_result = tud_hid_n_report(ITF_HID, 0, buffer, buffer_size);
printf("result %d\n", last_write_result);
if (last_write_result == false)
return 0;
@@ -127,7 +190,7 @@ void tud_hid_set_report_cb(uint8_t itf, uint8_t report_id, hid_report_type_t rep
(void) report_id;
(void) report_type;
usb_rx(ITF_HID, buffer, bufsize);
usb_rx(itf, buffer, bufsize);
}
uint32_t last_cmd_time = 0, last_packet_time = 0;