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246 lines
8.2 KiB
246 lines
8.2 KiB
// Copyright 2021 QMK
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// Copyright 2022 Stefan Kerkmann
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "serial_usart.h"
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#include "serial_protocol.h"
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#include "synchronization_util.h"
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#if defined(SERIAL_USART_CONFIG)
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static QMKSerialConfig serial_config = SERIAL_USART_CONFIG;
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#elif defined(MCU_STM32) /* STM32 MCUs */
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static QMKSerialConfig serial_config = {
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# if HAL_USE_SERIAL
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.speed = (SERIAL_USART_SPEED),
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# else
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.baud = (SERIAL_USART_SPEED),
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# endif
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.cr1 = (SERIAL_USART_CR1),
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.cr2 = (SERIAL_USART_CR2),
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# if !defined(SERIAL_USART_FULL_DUPLEX)
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.cr3 = ((SERIAL_USART_CR3) | USART_CR3_HDSEL) /* activate half-duplex mode */
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# else
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.cr3 = (SERIAL_USART_CR3)
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# endif
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};
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#elif defined(MCU_RP) /* Raspberry Pi MCUs */
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/* USART in 8E2 config with RX and TX FIFOs enabled. */
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// clang-format off
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static QMKSerialConfig serial_config = {
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.baud = (SERIAL_USART_SPEED),
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.UARTLCR_H = UART_UARTLCR_H_WLEN_8BITS | UART_UARTLCR_H_PEN | UART_UARTLCR_H_STP2 | UART_UARTLCR_H_FEN,
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.UARTCR = 0U,
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.UARTIFLS = UART_UARTIFLS_RXIFLSEL_1_8F | UART_UARTIFLS_TXIFLSEL_1_8E,
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.UARTDMACR = 0U
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};
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// clang-format on
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#else
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# error MCU Familiy not supported by default, supply your own serial_config by defining SERIAL_USART_CONFIG in your keyboard files.
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#endif
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static QMKSerialDriver* serial_driver = (QMKSerialDriver*)&SERIAL_USART_DRIVER;
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#if HAL_USE_SERIAL
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/**
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* @brief SERIAL Driver startup routine.
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*/
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static inline void usart_driver_start(void) {
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sdStart(serial_driver, &serial_config);
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}
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inline void serial_transport_driver_clear(void) {
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osalSysLock();
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bool volatile queue_not_empty = !iqIsEmptyI(&serial_driver->iqueue);
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osalSysUnlock();
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while (queue_not_empty) {
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osalSysLock();
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/* Hard reset the input queue. */
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iqResetI(&serial_driver->iqueue);
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osalSysUnlock();
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/* Allow pending interrupts to preempt.
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* Do not merge the lock/unlock blocks into one
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* or the code will not work properly.
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* The empty read adds a tiny amount of delay. */
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(void)queue_not_empty;
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osalSysLock();
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queue_not_empty = !iqIsEmptyI(&serial_driver->iqueue);
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osalSysUnlock();
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}
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}
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#elif HAL_USE_SIO
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void clear_rx_evt_cb(SIODriver* siop) {
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osalSysLockFromISR();
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/* If errors occured during transactions this callback is invoked. We just
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* clear the error sources and move on. We rely on the fact that we check
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* for the success of the transaction by comparing the received/send bytes
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* with the actual received/send bytes in the send/receive functions. */
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sioGetAndClearEventsI(serial_driver);
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osalSysUnlockFromISR();
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}
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static const SIOOperation serial_usart_operation = {.rx_cb = NULL, .rx_idle_cb = NULL, .tx_cb = NULL, .tx_end_cb = NULL, .rx_evt_cb = &clear_rx_evt_cb};
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/**
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* @brief SIO Driver startup routine.
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*/
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static inline void usart_driver_start(void) {
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sioStart(serial_driver, &serial_config);
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sioStartOperation(serial_driver, &serial_usart_operation);
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}
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inline void serial_transport_driver_clear(void) {
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osalSysLock();
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while (!sioIsRXEmptyX(serial_driver)) {
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(void)sioGetX(serial_driver);
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}
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osalSysUnlock();
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}
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#else
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# error Either the SERIAL or SIO driver has to be activated to use the usart driver for split keyboards.
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#endif
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inline bool serial_transport_send(const uint8_t* source, const size_t size) {
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bool success = (size_t)chnWriteTimeout(serial_driver, source, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
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#if !defined(SERIAL_USART_FULL_DUPLEX)
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/* Half duplex fills the input queue with the data we wrote - just throw it away. */
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if (likely(success)) {
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size_t bytes_left = size;
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# if HAL_USE_SERIAL
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/* The SERIAL driver uses large soft FIFOs that are filled from an IRQ
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* context, so there is a delay between receiving the data and it
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* becoming actually available, therefore we have to apply a timeout
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* mechanism. Under the right circumstances (e.g. bad cables paired with
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* high baud rates) less bytes can be present in the input queue as
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* well. */
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uint8_t dump[64];
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while (unlikely(bytes_left >= 64)) {
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if (unlikely(!serial_transport_receive(dump, 64))) {
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return false;
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}
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bytes_left -= 64;
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}
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return serial_transport_receive(dump, bytes_left);
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# else
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/* The SIO driver directly accesses the hardware FIFOs of the USART
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* peripheral. As these are limited in depth, the RX FIFO might have been
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* overflowed by a large that we just send. Therefore we attempt to read
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* back all the data we send or until the FIFO runs empty in case it
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* overflowed and data was truncated. */
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if (unlikely(sioSynchronizeTXEnd(serial_driver, TIME_MS2I(SERIAL_USART_TIMEOUT)) < MSG_OK)) {
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return false;
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}
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osalSysLock();
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while (bytes_left > 0 && !sioIsRXEmptyX(serial_driver)) {
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(void)sioGetX(serial_driver);
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bytes_left--;
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}
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osalSysUnlock();
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# endif
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}
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#endif
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return success;
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}
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inline bool serial_transport_receive(uint8_t* destination, const size_t size) {
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bool success = (size_t)chnReadTimeout(serial_driver, destination, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
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return success;
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}
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inline bool serial_transport_receive_blocking(uint8_t* destination, const size_t size) {
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bool success = (size_t)chnRead(serial_driver, destination, size) == size;
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return success;
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}
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#if !defined(SERIAL_USART_FULL_DUPLEX)
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/**
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* @brief Initiate pins for USART peripheral. Half-duplex configuration.
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*/
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__attribute__((weak)) void usart_init(void) {
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# if defined(MCU_STM32) /* STM32 MCUs */
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# if defined(USE_GPIOV1)
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palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_OPENDRAIN);
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# else
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palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_TX_PAL_MODE) | PAL_OUTPUT_TYPE_OPENDRAIN);
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# endif
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# if defined(USART_REMAP)
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USART_REMAP;
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# endif
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# elif defined(MCU_RP) /* Raspberry Pi MCUs */
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# error Half-duplex with the SIO driver is not supported due to hardware limitations on the RP2040, switch to the PIO driver which has half-duplex support.
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# else
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# pragma message "usart_init: MCU Familiy not supported by default, please supply your own init code by implementing usart_init() in your keyboard files."
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# endif
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}
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#else
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/**
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* @brief Initiate pins for USART peripheral. Full-duplex configuration.
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*/
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__attribute__((weak)) void usart_init(void) {
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# if defined(MCU_STM32) /* STM32 MCUs */
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# if defined(USE_GPIOV1)
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palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_PUSHPULL);
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palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_INPUT);
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# else
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palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_TX_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST);
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palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_ALTERNATE(SERIAL_USART_RX_PAL_MODE) | PAL_OUTPUT_TYPE_PUSHPULL | PAL_OUTPUT_SPEED_HIGHEST);
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# endif
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# if defined(USART_REMAP)
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USART_REMAP;
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# endif
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# elif defined(MCU_RP) /* Raspberry Pi MCUs */
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palSetLineMode(SERIAL_USART_TX_PIN, PAL_MODE_ALTERNATE_UART);
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palSetLineMode(SERIAL_USART_RX_PIN, PAL_MODE_ALTERNATE_UART);
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# else
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# pragma message "usart_init: MCU Familiy not supported by default, please supply your own init code by implementing usart_init() in your keyboard files."
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# endif
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}
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#endif
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/**
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* @brief Overridable master specific initializations.
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*/
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__attribute__((weak, nonnull)) void usart_master_init(QMKSerialDriver** driver) {
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(void)driver;
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usart_init();
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}
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/**
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* @brief Overridable slave specific initializations.
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*/
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__attribute__((weak, nonnull)) void usart_slave_init(QMKSerialDriver** driver) {
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(void)driver;
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usart_init();
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}
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void serial_transport_driver_slave_init(void) {
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usart_slave_init(&serial_driver);
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usart_driver_start();
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}
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void serial_transport_driver_master_init(void) {
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usart_master_init(&serial_driver);
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#if defined(MCU_STM32) && defined(SERIAL_USART_PIN_SWAP)
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serial_config.cr2 |= USART_CR2_SWAP; // master has swapped TX/RX pins
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#endif
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usart_driver_start();
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}
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