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306 lines
10 KiB
306 lines
10 KiB
/* Copyright 2021 QMK
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "serial_usart.h"
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#if defined(SERIAL_USART_CONFIG)
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static SerialConfig serial_config = SERIAL_USART_CONFIG;
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#else
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static SerialConfig serial_config = {
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.speed = (SERIAL_USART_SPEED), /* speed - mandatory */
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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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#endif
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static SerialDriver* serial_driver = &SERIAL_USART_DRIVER;
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static inline bool react_to_transactions(void);
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static inline bool __attribute__((nonnull)) receive(uint8_t* destination, const size_t size);
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static inline bool __attribute__((nonnull)) send(const uint8_t* source, const size_t size);
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static inline bool initiate_transaction(uint8_t sstd_index);
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static inline void usart_clear(void);
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/**
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* @brief Clear the receive input queue.
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*/
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static inline void usart_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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/**
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* @brief Blocking send of buffer with timeout.
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*
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* @return true Send success.
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* @return false Send failed.
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*/
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static inline bool send(const uint8_t* source, const size_t size) {
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bool success = (size_t)sdWriteTimeout(serial_driver, source, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
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#if !defined(SERIAL_USART_FULL_DUPLEX)
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if (success) {
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/* Half duplex fills the input queue with the data we wrote - just throw it away.
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Under the right circumstances (e.g. bad cables paired with high baud rates)
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less bytes can be present in the input queue, therefore a timeout is needed. */
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uint8_t dump[size];
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return receive(dump, size);
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}
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#endif
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return success;
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}
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/**
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* @brief Blocking receive of size * bytes with timeout.
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*
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* @return true Receive success.
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* @return false Receive failed.
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*/
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static inline bool receive(uint8_t* destination, const size_t size) {
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bool success = (size_t)sdReadTimeout(serial_driver, destination, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == 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)
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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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# 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)
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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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# 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(SerialDriver** 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(SerialDriver** 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 This thread runs on the slave and responds to transactions initiated
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* by the master.
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*/
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static THD_WORKING_AREA(waSlaveThread, 1024);
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static THD_FUNCTION(SlaveThread, arg) {
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(void)arg;
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chRegSetThreadName("usart_tx_rx");
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while (true) {
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if (!react_to_transactions()) {
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/* Clear the receive queue, to start with a clean slate.
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* Parts of failed transactions or spurious bytes could still be in it. */
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usart_clear();
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}
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}
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}
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/**
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* @brief Slave specific initializations.
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*/
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void soft_serial_target_init(void) {
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usart_slave_init(&serial_driver);
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sdStart(serial_driver, &serial_config);
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/* Start transport thread. */
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chThdCreateStatic(waSlaveThread, sizeof(waSlaveThread), HIGHPRIO, SlaveThread, NULL);
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}
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/**
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* @brief React to transactions started by the master.
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*/
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static inline bool react_to_transactions(void) {
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/* Wait until there is a transaction for us. */
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uint8_t sstd_index = (uint8_t)sdGet(serial_driver);
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/* Sanity check that we are actually responding to a valid transaction. */
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if (sstd_index >= NUM_TOTAL_TRANSACTIONS) {
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return false;
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}
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split_transaction_desc_t* trans = &split_transaction_table[sstd_index];
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/* Send back the handshake which is XORed as a simple checksum,
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to signal that the slave is ready to receive possible transaction buffers */
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sstd_index ^= HANDSHAKE_MAGIC;
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if (!send(&sstd_index, sizeof(sstd_index))) {
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return false;
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}
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/* Receive transaction buffer from the master. If this transaction requires it.*/
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if (trans->initiator2target_buffer_size) {
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if (!receive(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
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return false;
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}
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}
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/* Allow any slave processing to occur. */
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if (trans->slave_callback) {
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trans->slave_callback(trans->initiator2target_buffer_size, split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size, split_trans_target2initiator_buffer(trans));
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}
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/* Send transaction buffer to the master. If this transaction requires it. */
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if (trans->target2initiator_buffer_size) {
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if (!send(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
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return false;
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}
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}
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return true;
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}
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/**
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* @brief Master specific initializations.
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*/
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void soft_serial_initiator_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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sdStart(serial_driver, &serial_config);
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}
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/**
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* @brief Start transaction from the master half to the slave half.
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*
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* @param index Transaction Table index of the transaction to start.
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* @return bool Indicates success of transaction.
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*/
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bool soft_serial_transaction(int index) {
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/* Clear the receive queue, to start with a clean slate.
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* Parts of failed transactions or spurious bytes could still be in it. */
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usart_clear();
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return initiate_transaction((uint8_t)index);
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}
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/**
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* @brief Initiate transaction to slave half.
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*/
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static inline bool initiate_transaction(uint8_t sstd_index) {
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/* Sanity check that we are actually starting a valid transaction. */
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if (sstd_index >= NUM_TOTAL_TRANSACTIONS) {
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dprintln("USART: Illegal transaction Id.");
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return false;
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}
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split_transaction_desc_t* trans = &split_transaction_table[sstd_index];
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/* Send transaction table index to the slave, which doubles as basic handshake token. */
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if (!send(&sstd_index, sizeof(sstd_index))) {
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dprintln("USART: Send Handshake failed.");
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return false;
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}
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uint8_t sstd_index_shake = 0xFF;
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/* Which we always read back first so that we can error out correctly.
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* - due to the half duplex limitations on return codes, we always have to read *something*.
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* - without the read, write only transactions *always* succeed, even during the boot process where the slave is not ready.
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*/
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if (!receive(&sstd_index_shake, sizeof(sstd_index_shake)) || (sstd_index_shake != (sstd_index ^ HANDSHAKE_MAGIC))) {
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dprintln("USART: Handshake failed.");
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return false;
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}
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/* Send transaction buffer to the slave. If this transaction requires it. */
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if (trans->initiator2target_buffer_size) {
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if (!send(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
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dprintln("USART: Send failed.");
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return false;
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}
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}
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/* Receive transaction buffer from the slave. If this transaction requires it. */
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if (trans->target2initiator_buffer_size) {
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if (!receive(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
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dprintln("USART: Receive failed.");
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return false;
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}
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}
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return true;
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}
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