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c35a62ea73
The HID protocol was a mistake - I blame the fact that I have all the musical ability of a snail on drugs. The obviously correct answer is to use MIDI, so that we could use an actual standard interface both on a computer and even using things like external stomp switches. As always, the USB code is written by Antigravity. I think that's the proper distribution of roles: Ricky has been doing any actual _musical_ effects, I've been doing the hardware interfaces, and Antigravity deals with the tinyusb integration. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
#include "pico/stdlib.h"
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#include "tusb.h"
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#include "usb-sync.h"
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extern void handle_midi_packet(const uint8_t packet[4]);
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// Needed because audio/effect.h expects it
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float get_usb_audio_input(void)
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{
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return 0.0f;
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}
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#ifndef BOARD_TUH_RHPORT
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#define BOARD_TUH_RHPORT 0
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#endif
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int init_usb(void)
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{
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const tusb_rhport_init_t rh_init = {
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.role = TUSB_ROLE_HOST,
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.speed = TUSB_SPEED_FULL
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};
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return tusb_init(BOARD_TUH_RHPORT, &rh_init);
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}
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static bool sync_connected = false;
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static uint8_t sync_idx = 0;
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void tuh_midi_mount_cb(uint8_t idx, const tuh_midi_mount_cb_t *mount_cb_data)
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{
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(void)mount_cb_data;
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sync_idx = idx;
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sync_connected = true;
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}
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void tuh_midi_umount_cb(uint8_t idx)
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{
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if (idx == sync_idx) {
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sync_connected = false;
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}
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}
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void send_midi_cc(uint8_t cc, uint8_t val)
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{
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if (sync_connected) {
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uint8_t packet[4] = { 0x0B, 0xB0, cc, val };
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tuh_midi_packet_write(sync_idx, packet);
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tuh_midi_write_flush(sync_idx);
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}
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}
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void send_midi_pc(uint8_t pc)
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{
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if (sync_connected) {
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uint8_t packet[4] = { 0x0C, 0xC0, pc, 0 };
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tuh_midi_packet_write(sync_idx, packet);
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tuh_midi_write_flush(sync_idx);
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}
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}
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void tuh_midi_rx_cb(uint8_t idx, uint32_t xferred_bytes)
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{
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(void)xferred_bytes;
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if (sync_connected && idx == sync_idx) {
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uint8_t packet[4];
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while (tuh_midi_packet_read(idx, packet)) {
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handle_midi_packet(packet);
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}
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}
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}
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