222 lines
6.2 KiB
C
222 lines
6.2 KiB
C
/*
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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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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "bsp/board_api.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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void midi_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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// init device stack on configured roothub port
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tud_init(BOARD_TUD_RHPORT);
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if (board_init_after_tusb) {
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board_init_after_tusb();
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}
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while (1)
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{
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tud_task(); // tinyusb device task
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led_blinking_task();
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cdc_task();
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midi_task();
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}
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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 = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED;
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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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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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uint8_t buf[64];
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// read and echo back
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uint32_t count = tud_cdc_read(buf, sizeof(buf));
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for(uint32_t i=0; i<count; i++)
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{
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tud_cdc_write_char(buf[i]);
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if ( buf[i] == '\r' ) tud_cdc_write_char('\n');
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}
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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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// connected
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if ( dtr && rts )
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{
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// print initial message when connected
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tud_cdc_write_str("\r\nTinyUSB CDC MSC device example\r\n");
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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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// MIDI Task
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//--------------------------------------------------------------------+
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// Variable that holds the current position in the sequence.
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uint32_t note_pos = 0;
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// Store example melody as an array of note values
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static const uint8_t note_sequence[] =
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{
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74,78,81,86,90,93,98,102,57,61,66,69,73,78,81,85,88,92,97,100,97,92,88,85,81,78,
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74,69,66,62,57,62,66,69,74,78,81,86,90,93,97,102,97,93,90,85,81,78,73,68,64,61,
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56,61,64,68,74,78,81,86,90,93,98,102
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};
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void midi_task(void)
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{
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static uint32_t start_ms = 0;
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uint8_t const cable_num = 0; // MIDI jack associated with USB endpoint
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uint8_t const channel = 0; // 0 for channel 1
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// The MIDI interface always creates input and output port/jack descriptors
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// regardless of these being used or not. Therefore incoming traffic should be read
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// (possibly just discarded) to avoid the sender blocking in IO
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uint8_t packet[4];
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while( tud_midi_available() ) tud_midi_packet_read(packet);
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// send note every 1000 ms
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if (board_millis() - start_ms < 286) return; // not enough time
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start_ms += 286;
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// Previous positions in the note sequence.
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int previous = (int) (note_pos - 1);
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// If we currently are at position 0, set the
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// previous position to the last note in the sequence.
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if (previous < 0) previous = sizeof(note_sequence) - 1;
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// Send Note On for current position at full velocity (127) on channel 1.
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uint8_t note_on[3] = { 0x90 | channel, note_sequence[note_pos], 127 };
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tud_midi_stream_write(cable_num, note_on, 3);
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// Send Note Off for previous note.
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uint8_t note_off[3] = { 0x80 | channel, note_sequence[previous], 0};
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tud_midi_stream_write(cable_num, note_off, 3);
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// Increment position
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note_pos++;
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// If we are at the end of the sequence, start over.
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if (note_pos >= sizeof(note_sequence)) note_pos = 0;
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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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