Add dual role (concurrent) example
This reads HID devices over host and then translates that to ASCII and sends it over CDC device.
This commit is contained in:
Scott Shawcroft
291
examples/host/hid_to_cdc/src/main.c
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291
examples/host/hid_to_cdc/src/main.c
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Ha Thach (tinyusb.org)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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// This example runs both host and device concurrently. The USB host looks for
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// any HID device with reports that are 8 bytes long and then assumes they are
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// keyboard reports. It translates the keypresses of the reports to ASCII and
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// transmits it over CDC to the device's host.
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "bsp/board.h"
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#include "tusb.h"
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//--------------------------------------------------------------------+
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// MACRO CONSTANT TYPEDEF PROTYPES
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//--------------------------------------------------------------------+
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/* Blink pattern
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* - 250 ms : device not mounted
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* - 1000 ms : device mounted
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* - 2500 ms : device is suspended
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*/
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enum {
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BLINK_NOT_MOUNTED = 250,
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BLINK_MOUNTED = 1000,
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BLINK_SUSPENDED = 2500,
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};
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static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
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void led_blinking_task(void);
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void cdc_task(void);
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/*------------- MAIN -------------*/
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int main(void)
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{
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board_init();
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tusb_init();
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while (1)
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{
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tud_task(); // tinyusb device task
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tuh_task(); // tinyusb host task
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led_blinking_task();
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cdc_task();
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}
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return 0;
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}
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//--------------------------------------------------------------------+
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// Device callbacks
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//--------------------------------------------------------------------+
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// Invoked when device is mounted
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void tud_mount_cb(void)
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{
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blink_interval_ms = BLINK_MOUNTED;
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}
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// Invoked when device is unmounted
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void tud_umount_cb(void)
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{
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blink_interval_ms = BLINK_NOT_MOUNTED;
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}
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// Invoked when usb bus is suspended
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// remote_wakeup_en : if host allow us to perform remote wakeup
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// Within 7ms, device must draw an average of current less than 2.5 mA from bus
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void tud_suspend_cb(bool remote_wakeup_en)
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{
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(void) remote_wakeup_en;
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blink_interval_ms = BLINK_SUSPENDED;
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}
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// Invoked when usb bus is resumed
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void tud_resume_cb(void)
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{
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blink_interval_ms = BLINK_MOUNTED;
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}
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//--------------------------------------------------------------------+
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// Host callbacks
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//--------------------------------------------------------------------+
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// Invoked when device with hid interface is mounted
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// Report descriptor is also available for use. tuh_hid_parse_report_descriptor()
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// can be used to parse common/simple enough descriptor.
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// Note: if report descriptor length > CFG_TUH_ENUMERATION_BUFSIZE, it will be skipped
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// therefore report_desc = NULL, desc_len = 0
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void tuh_hid_mount_cb(uint8_t dev_addr, uint8_t instance, uint8_t const* desc_report, uint16_t desc_len)
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{
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(void)desc_report;
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(void)desc_len;
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uint16_t vid, pid;
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tuh_vid_pid_get(dev_addr, &vid, &pid);
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printf("HID device address = %d, instance = %d is mounted\r\n", dev_addr, instance);
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printf("VID = %04x, PID = %04x\r\n", vid, pid);
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// Receive any report and treat it like a keyboard.
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// tuh_hid_report_received_cb() will be invoked when report is available
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if ( !tuh_hid_receive_report(dev_addr, instance) )
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{
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printf("Error: cannot request to receive report\r\n");
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}
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}
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// Invoked when device with hid interface is un-mounted
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void tuh_hid_umount_cb(uint8_t dev_addr, uint8_t instance)
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{
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printf("HID device address = %d, instance = %d is unmounted\r\n", dev_addr, instance);
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}
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const char* numbers = "0123456789";
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// Uncomment if you use colemak and need to remap keys (like @tannewt.)
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// const uint8_t colemak[77] = {
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// 0, 0, 0, 0, 0, 0, 0, 22,
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// 9, 23, 7, 0, 24, 17, 8, 12,
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// 0, 14, 28, 51, 0, 19, 21, 10,
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// 15, 0, 0, 0, 13, 0, 0, 0,
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// 0, 0, 0, 0, 0, 0, 0, 0,
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// 0, 0, 0, 0, 0, 0, 0, 0,
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// 0, 0, 0, 18, 0, 0, 0, 0,
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// 0, 0, 0, 0, 0, 0, 0, 0,
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// 0, 0, 0, 0, 0, 0, 0, 0,
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// 0, 0, 0, 0, 0
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// };
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// This is the reverse mapping of the US key layout in Adafruit_CircuitPython_HID.
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const char* ascii = "\0\0\0\0abcdefghijklmnopqrstuvwxyz1234567890\n\x1b\x08\t -=[]\\\x00;\'`,./\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x7f";
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const char* shifted = "\0\0\0\0ABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%^&*()\0\0\0\0\0_+{}|\0:\"~<>?\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
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// Bitmask of pressed keys. We use the current modifier state.
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uint32_t last_state[8];
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// Invoked when received report from device via interrupt endpoint
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void tuh_hid_report_received_cb(uint8_t dev_addr, uint8_t instance, uint8_t const* report, uint16_t len)
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{
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if (len != 8 && len < 10) {
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tud_cdc_write("report len: ", 12);
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tud_cdc_write(numbers + len, 1);
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tud_cdc_write("\r\n", 2);
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tud_cdc_write_flush();
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}
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if (len != 8) {
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// Don't request a new report for a wrong sized endpoint.
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return;
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}
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uint8_t modifiers = report[0];
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bool flush = false;
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for (int i = 2; i < 8; i++) {
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if (report[i] == 0) {
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continue;
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}
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uint8_t down = report[i];
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uint32_t mask = 1 << (down % 32);
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bool was_down = (last_state[down / 32] & mask) != 0;
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// Only map keycodes 0 - 76.
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if (!was_down && down < 77) {
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const char* layer = ascii;
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// Check shift bits
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if ((modifiers & 0x22) != 0) {
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layer = shifted;
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}
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// Map the key code for Colemak layout so @tannewt can type.
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// uint8_t colemak_key_code = colemak[down];
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// if (colemak_key_code != 0) {
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// down = colemak_key_code;
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// }
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char c = layer[down];
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if (c == '\0') {
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continue;
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}
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if (c == '\n') {
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tud_cdc_write("\r", 1);
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}
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tud_cdc_write(&c, 1);
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flush = true;
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}
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}
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if (flush) {
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tud_cdc_write_flush();
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}
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// Now update last_state
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memset(last_state, 0, 8 * sizeof(uint32_t));
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for (int i = 2; i < 8; i++) {
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if (report[i] == 0) {
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continue;
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}
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uint8_t down = report[i];
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last_state[down / 32] |= 1 << (down % 32);
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}
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// continue to request to receive report
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if ( !tuh_hid_receive_report(dev_addr, instance) )
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{
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printf("Error: cannot request to receive report\r\n");
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}
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}
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//--------------------------------------------------------------------+
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// USB CDC
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//--------------------------------------------------------------------+
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void cdc_task(void)
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{
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// connected() check for DTR bit
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// Most but not all terminal client set this when making connection
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// if ( tud_cdc_connected() )
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{
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// connected and there are data available
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if ( tud_cdc_available() )
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{
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// read datas
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char buf[64];
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uint32_t count = tud_cdc_read(buf, sizeof(buf));
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(void) count;
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// Echo back
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// Note: Skip echo by commenting out write() and write_flush()
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// for throughput test e.g
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// $ dd if=/dev/zero of=/dev/ttyACM0 count=10000
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tud_cdc_write(buf, count);
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tud_cdc_write_flush();
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}
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}
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}
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// Invoked when cdc when line state changed e.g connected/disconnected
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void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
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{
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(void) itf;
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(void) rts;
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// TODO set some indicator
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if ( dtr )
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{
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// Terminal connected
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}else
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{
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// Terminal disconnected
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}
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}
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// Invoked when CDC interface received data from host
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void tud_cdc_rx_cb(uint8_t itf)
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{
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(void) itf;
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}
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//--------------------------------------------------------------------+
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// BLINKING TASK
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//--------------------------------------------------------------------+
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void led_blinking_task(void)
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{
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static uint32_t start_ms = 0;
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static bool led_state = false;
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// Blink every interval ms
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if ( board_millis() - start_ms < blink_interval_ms) return; // not enough time
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start_ms += blink_interval_ms;
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board_led_write(led_state);
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led_state = 1 - led_state; // toggle
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}
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