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129 lines
4.2 KiB
C
129 lines
4.2 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 "dbgserial_input.h"
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#include "board/board.h"
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#include "drivers/dma.h"
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#include "drivers/exti.h"
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#include "drivers/uart.h"
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#include "kernel/util/stop.h"
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#include "os/tick.h"
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#include "services/common/system_task.h"
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#include "services/common/new_timer/new_timer.h"
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#include "system/passert.h"
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#include "util/attributes.h"
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#include "util/likely.h"
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#include "drivers/gpio.h"
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#define STOP_MODE_TIMEOUT_MS (2000)
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static void dbgserial_interrupt_handler(bool *should_context_switch);
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static DbgSerialCharacterCallback s_character_callback;
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static TimerID s_stop_mode_timeout_timer;
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//! Use a separate variable so it's safe to check from the ISR.
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static bool s_stop_mode_inhibited = false;
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//! We DMA into this buffer as a circular buffer
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#define DMA_BUFFER_LENGTH (200)
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static uint8_t DMA_BSS s_dma_buffer[DMA_BUFFER_LENGTH];
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static bool s_dma_enabled = false;
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static void stop_mode_timeout_timer_callback(void* cb_data) {
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// re-enable stop mode
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if (s_stop_mode_inhibited) {
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stop_mode_enable(InhibitorDbgSerial);
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s_stop_mode_inhibited = false;
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}
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}
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static bool prv_uart_irq_handler(UARTDevice *dev, uint8_t data, const UARTRXErrorFlags *err_flags) {
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bool should_context_switch = false;
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if (s_character_callback) {
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s_character_callback(data, &should_context_switch);
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}
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return should_context_switch;
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}
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void dbgserial_input_init(void) {
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exti_configure_pin(BOARD_CONFIG.dbgserial_int, ExtiTrigger_Falling, dbgserial_interrupt_handler);
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// some platforms have a separate pin for the EXTI int and the USART
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if (BOARD_CONFIG.dbgserial_int_gpio.gpio != NULL) {
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gpio_input_init(&BOARD_CONFIG.dbgserial_int_gpio);
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}
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// set up the USART interrupt on RX
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uart_set_rx_interrupt_handler(DBG_UART, prv_uart_irq_handler);
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uart_set_rx_interrupt_enabled(DBG_UART, true);
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s_stop_mode_timeout_timer = new_timer_create();
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// Enable receive interrupts
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dbgserial_enable_rx_exti();
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}
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void dbgserial_enable_rx_exti(void) {
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exti_enable(BOARD_CONFIG.dbgserial_int);
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}
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void dbgserial_register_character_callback(DbgSerialCharacterCallback callback) {
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s_character_callback = callback;
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}
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// This callback gets installed by dbgserial_interrupt_handler()
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// using system_task_add_callback_from_isr().
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// It is used to start up our timer since doing so from an ISR is not allowed.
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static void prv_start_timer_callback(void* data) {
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new_timer_start(s_stop_mode_timeout_timer, STOP_MODE_TIMEOUT_MS, stop_mode_timeout_timer_callback,
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NULL, 0 /*flags*/);
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}
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static void dbgserial_interrupt_handler(bool *should_context_switch) {
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exti_disable(BOARD_CONFIG.dbgserial_int);
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// Start the timer
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system_task_add_callback_from_isr(prv_start_timer_callback, (void *)0, should_context_switch);
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if (!s_stop_mode_inhibited) {
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// We don't bother cancelling the timer if we leave the state where we don't want to stop mode
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// anymore. For example, if we ctrl-c to enter the prompt (disable stop and start timer),
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// ctrl-d to leave the prompt, and then ctrl-c again before the timer goes off, we'll have the
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// timer still running. If we were to disable stop again after rescheduling the timer, the timer
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// would only go off once for the two disables and we'd end up jamming the reference count.
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stop_mode_disable(InhibitorDbgSerial);
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s_stop_mode_inhibited = true;
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}
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}
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void dbgserial_set_rx_dma_enabled(bool enabled) {
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#if TARGET_QEMU
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// we can't use DMA on QEMU
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enabled = false;
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#endif
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if (enabled == s_dma_enabled) {
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return;
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}
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s_dma_enabled = enabled;
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if (enabled) {
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uart_start_rx_dma(DBG_UART, s_dma_buffer, DMA_BUFFER_LENGTH);
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} else {
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uart_stop_rx_dma(DBG_UART);
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}
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}
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