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133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*
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* Copyright 2024 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "accessory_manager.h"
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#include "accessory_idle_mode.h"
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#include "accessory_imaging.h"
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#include "accessory_mfg_mode.h"
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#include "drivers/accessory.h"
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#include "system/logging.h"
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#include "os/mutex.h"
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static AccessoryInputState s_input_state = AccessoryInputStateIdle;
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static PebbleMutex *s_state_mutex;
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void accessory_manager_init(void) {
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s_state_mutex = mutex_create();
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}
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bool accessory_manager_handle_character_from_isr(char c) {
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// NOTE: THIS IS RUN WITHIN AN ISR
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switch (s_input_state) {
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case AccessoryInputStateMfg:
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return accessory_mfg_mode_handle_char(c);
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case AccessoryInputStateIdle:
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return accessory_idle_mode_handle_char(c);
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case AccessoryInputStateImaging:
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return accessory_imaging_handle_char(c);
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case AccessoryInputStateMic:
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// fallthrough
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default:
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break;
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}
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return false;
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}
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bool accessory_manager_handle_break_from_isr(void) {
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// NOTE: THIS IS RUN WITHIN AN ISR
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switch (s_input_state) {
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case AccessoryInputStateIdle:
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case AccessoryInputStateMic:
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case AccessoryInputStateMfg:
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case AccessoryInputStateImaging:
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// fallthrough
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default:
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break;
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}
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return false;
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}
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// Valid state transitions are:
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// +-----+
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// | IMG |
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// +-----+
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// ^
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// |
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// v
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// +------+ +-----+ +-----+
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// | Idle |<-->| MFG |<-->| MIC |
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// +------+ +-----+ +-----+
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static bool prv_is_valid_state_transition(AccessoryInputState new_state) {
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if (s_input_state == AccessoryInputStateIdle) {
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return new_state == AccessoryInputStateMfg;
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} else if (s_input_state == AccessoryInputStateMfg) {
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return (new_state == AccessoryInputStateIdle) ||
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(new_state == AccessoryInputStateImaging) ||
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(new_state == AccessoryInputStateMic);
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} else if (s_input_state == AccessoryInputStateImaging) {
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return new_state == AccessoryInputStateMfg;
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} else if (s_input_state == AccessoryInputStateMic) {
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return new_state == AccessoryInputStateMfg;
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}
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return false;
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}
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// The accessory state is used to differentiate between different consumers of the accessory port.
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// Before a consumer uses the accessory port, it must set its state and return the state to idle
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// once it has finished. No other consumer will be permitted to use the accessory port until the
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// state is returned to idle.
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bool accessory_manager_set_state(AccessoryInputState state) {
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mutex_lock(s_state_mutex);
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if (!prv_is_valid_state_transition(state)) {
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// the state is already set by somebody else
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mutex_unlock(s_state_mutex);
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return false;
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}
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s_input_state = state;
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switch (s_input_state) {
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case AccessoryInputStateMfg:
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accessory_enable_input();
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accessory_set_baudrate(AccessoryBaud115200);
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accessory_set_power(false);
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accessory_mfg_mode_start();
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break;
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case AccessoryInputStateIdle:
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// restore accessory to default state
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accessory_enable_input();
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accessory_set_baudrate(AccessoryBaud115200);
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accessory_set_power(false);
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break;
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case AccessoryInputStateImaging:
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accessory_enable_input();
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accessory_set_baudrate(AccessoryBaud921600);
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accessory_set_power(false);
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break;
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case AccessoryInputStateMic:
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// fallthrough
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default:
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break;
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}
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mutex_unlock(s_state_mutex);
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PBL_LOG(LOG_LEVEL_DEBUG, "Setting accessory state to %u", state);
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return true;
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}
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