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https://github.com/bluekitchen/btstack.git
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example/hid_keyboard_demo: queue keys via ringbuffer
This commit is contained in:
Matthias Ringwald
parent
60737d2b39
commit
1884c6384f
@ -62,6 +62,10 @@
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// to enable demo text on POSIX systems
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// #undef HAVE_BTSTACK_STDIN
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// timing of keypresses
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#define TYPING_KEYDOWN_MS 20
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#define TYPING_DELAY_MS 20
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// When not set to 0xffff, sniff and sniff subrating are enabled
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static uint16_t host_max_latency = 1600;
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static uint16_t host_min_timeout = 3200;
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@ -181,10 +185,18 @@ static uint8_t device_id_sdp_service_buffer[100];
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static const char hid_device_name[] = "BTstack HID Keyboard";
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static btstack_packet_callback_registration_t hci_event_callback_registration;
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static uint16_t hid_cid;
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static bd_addr_t device_addr;
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static uint8_t hid_boot_device = 0;
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// HID Report sending
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static uint8_t send_buffer_storage[16];
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static btstack_ring_buffer_t send_buffer;
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static btstack_timer_source_t send_timer;
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static uint8_t send_modifier;
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static uint8_t send_keycode;
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static bool send_active;
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#ifdef HAVE_BTSTACK_STDIN
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static bd_addr_t device_addr;
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static const char * device_addr_string = "BC:EC:5D:E6:15:03";
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#endif
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@ -196,39 +208,29 @@ static enum {
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} app_state = APP_BOOTING;
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// HID Keyboard lookup
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static int lookup_keycode(uint8_t character, const uint8_t * table, int size, uint8_t * keycode){
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static bool lookup_keycode(uint8_t character, const uint8_t * table, int size, uint8_t * keycode){
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int i;
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for (i=0;i<size;i++){
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if (table[i] != character) continue;
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*keycode = i;
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return 1;
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return true;
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}
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return 0;
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return false;
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}
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static int keycode_and_modifer_us_for_character(uint8_t character, uint8_t * keycode, uint8_t * modifier){
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int found;
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static bool keycode_and_modifer_us_for_character(uint8_t character, uint8_t * keycode, uint8_t * modifier){
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bool found;
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found = lookup_keycode(character, keytable_us_none, sizeof(keytable_us_none), keycode);
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if (found) {
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*modifier = 0; // none
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return 1;
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return true;
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}
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found = lookup_keycode(character, keytable_us_shift, sizeof(keytable_us_shift), keycode);
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if (found) {
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*modifier = 2; // shift
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return 1;
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return true;
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}
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return 0;
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}
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// HID Report sending
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static int send_keycode;
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static int send_modifier;
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static void send_key(int modifier, int keycode){
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send_keycode = keycode;
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send_modifier = modifier;
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hid_device_request_can_send_now_event(hid_cid);
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return false;
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}
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static void send_report(int modifier, int keycode){
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@ -236,6 +238,41 @@ static void send_report(int modifier, int keycode){
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hid_device_send_interrupt_message(hid_cid, &report[0], sizeof(report));
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}
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static void trigger_key_up(btstack_timer_source_t * ts){
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UNUSED(ts);
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hid_device_request_can_send_now_event(hid_cid);
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}
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static void send_next(btstack_timer_source_t * ts) {
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// get next key from buffer
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uint8_t character;
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uint32_t num_bytes_read = 0;
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btstack_ring_buffer_read(&send_buffer, &character, 1, &num_bytes_read);
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if (num_bytes_read == 0) {
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// buffer empty, nothing to send
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send_active = false;
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} else {
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send_active = true;
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// lookup keycode and modifier using US layout
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bool found = keycode_and_modifer_us_for_character(character, &send_keycode, &send_modifier);
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if (found) {
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// request can send now
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hid_device_request_can_send_now_event(hid_cid);
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} else {
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// restart timer for next character
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btstack_run_loop_set_timer(ts, TYPING_DELAY_MS);
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btstack_run_loop_add_timer(ts);
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}
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}
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}
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static void queue_character(char character){
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btstack_ring_buffer_write(&send_buffer, (uint8_t *) &character, 1);
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if (send_active == false) {
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send_next(&send_timer);
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}
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}
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// Demo Application
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#ifdef HAVE_BTSTACK_STDIN
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@ -243,23 +280,14 @@ static void send_report(int modifier, int keycode){
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// On systems with STDIN, we can directly type on the console
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static void stdin_process(char character){
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uint8_t modifier;
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uint8_t keycode;
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int found;
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switch (app_state){
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case APP_BOOTING:
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case APP_CONNECTING:
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// ignore
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break;
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case APP_CONNECTED:
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// send keyu
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found = keycode_and_modifer_us_for_character(character, &keycode, &modifier);
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if (found){
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send_key(modifier, keycode);
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return;
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}
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// add char to send buffer
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queue_character(character);
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break;
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case APP_NOT_CONNECTED:
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printf("Connecting to %s...\n", bd_addr_to_str(device_addr));
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@ -272,44 +300,28 @@ static void stdin_process(char character){
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}
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#else
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// On embedded systems, send constant demo text with fixed period
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// On embedded systems, send constant demo text
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#define TYPING_DEMO_PERIOD_MS 100
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#define TYPING_PERIOD_MS 100
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static const char * demo_text = "\n\nHello World!\n\nThis is the BTstack HID Keyboard Demo running on an Embedded Device.\n\n";
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static int demo_pos;
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static btstack_timer_source_t typing_timer;
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static btstack_timer_source_t demo_text_timer;
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static void typing_timer_handler(btstack_timer_source_t * ts){
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static void demo_text_timer_handler(btstack_timer_source_t * ts){
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UNUSED(ts);
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// abort if not connected
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if (!hid_cid) return;
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// get next character
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// queue character
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uint8_t character = demo_text[demo_pos++];
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if (demo_text[demo_pos] == 0){
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demo_pos = 0;
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}
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queue_character(character);
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// get keycodeand send
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uint8_t modifier;
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uint8_t keycode;
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int found = keycode_and_modifer_us_for_character(character, &keycode, &modifier);
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if (found){
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send_key(modifier, keycode);
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}
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// set next timer
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btstack_run_loop_set_timer(ts, TYPING_PERIOD_MS);
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btstack_run_loop_add_timer(ts);
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}
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static void hid_embedded_start_typing(void){
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demo_pos = 0;
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// set one-shot timer
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typing_timer.process = &typing_timer_handler;
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btstack_run_loop_set_timer(&typing_timer, TYPING_PERIOD_MS);
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btstack_run_loop_add_timer(&typing_timer);
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// set timer for next character
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btstack_run_loop_set_timer_handler(&demo_text_timer, demo_text_timer_handler);
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btstack_run_loop_set_timer(&demo_text_timer, TYPING_DEMO_PERIOD_MS);
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btstack_run_loop_add_timer(&demo_text_timer);
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}
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#endif
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@ -349,10 +361,11 @@ static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t * pack
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printf("HID Connected, please start typing...\n");
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#else
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printf("HID Connected, sending demo text...\n");
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hid_embedded_start_typing();
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demo_text_timer_handler(NULL);
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#endif
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break;
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case HID_SUBEVENT_CONNECTION_CLOSED:
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btstack_run_loop_remove_timer(&send_timer);
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printf("HID Disconnected\n");
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app_state = APP_NOT_CONNECTED;
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hid_cid = 0;
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@ -360,12 +373,18 @@ static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t * pack
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case HID_SUBEVENT_CAN_SEND_NOW:
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if (send_keycode){
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send_report(send_modifier, send_keycode);
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// schedule key up
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send_keycode = 0;
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send_modifier = 0;
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hid_device_request_can_send_now_event(hid_cid);
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btstack_run_loop_set_timer_handler(&send_timer, trigger_key_up);
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btstack_run_loop_set_timer(&send_timer, TYPING_KEYDOWN_MS);
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} else {
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send_report(0, 0);
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// schedule next key down
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btstack_run_loop_set_timer_handler(&send_timer, send_next);
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btstack_run_loop_set_timer(&send_timer, TYPING_DELAY_MS);
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}
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btstack_run_loop_add_timer(&send_timer);
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break;
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default:
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break;
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@ -459,7 +478,10 @@ int btstack_main(int argc, const char * argv[]){
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#ifdef HAVE_BTSTACK_STDIN
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sscanf_bd_addr(device_addr_string, device_addr);
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btstack_stdin_setup(stdin_process);
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#endif
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#endif
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btstack_ring_buffer_init(&send_buffer, send_buffer_storage, sizeof(send_buffer_storage));
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// turn on!
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hci_power_control(HCI_POWER_ON);
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return 0;
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