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Diffstat (limited to 'platforms/chibios/drivers/serial_usart.c')
-rw-r--r--platforms/chibios/drivers/serial_usart.c173
1 files changed, 129 insertions, 44 deletions
diff --git a/platforms/chibios/drivers/serial_usart.c b/platforms/chibios/drivers/serial_usart.c
index e9fa4af7a3..7ea25d005b 100644
--- a/platforms/chibios/drivers/serial_usart.c
+++ b/platforms/chibios/drivers/serial_usart.c
@@ -1,44 +1,47 @@
-/* Copyright 2021 QMK
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2021 QMK
+// Copyright 2022 Stefan Kerkmann
+// SPDX-License-Identifier: GPL-2.0-or-later
#include "serial_usart.h"
#include "synchronization_util.h"
#if defined(SERIAL_USART_CONFIG)
-static SerialConfig serial_config = SERIAL_USART_CONFIG;
+static QMKSerialConfig serial_config = SERIAL_USART_CONFIG;
#else
-static SerialConfig serial_config = {
- .speed = (SERIAL_USART_SPEED), /* speed - mandatory */
+static QMKSerialConfig serial_config = {
+# if HAL_USE_SERIAL
+ .speed = (SERIAL_USART_SPEED), /* baudrate - mandatory */
+# else
+ .baud = (SERIAL_USART_SPEED), /* baudrate - mandatory */
+# endif
.cr1 = (SERIAL_USART_CR1),
.cr2 = (SERIAL_USART_CR2),
# if !defined(SERIAL_USART_FULL_DUPLEX)
.cr3 = ((SERIAL_USART_CR3) | USART_CR3_HDSEL) /* activate half-duplex mode */
# else
- .cr3 = (SERIAL_USART_CR3)
+ .cr3 = (SERIAL_USART_CR3)
# endif
};
#endif
-static SerialDriver* serial_driver = &SERIAL_USART_DRIVER;
+static QMKSerialDriver* serial_driver = (QMKSerialDriver*)&SERIAL_USART_DRIVER;
static inline bool react_to_transactions(void);
static inline bool __attribute__((nonnull)) receive(uint8_t* destination, const size_t size);
+static inline bool __attribute__((nonnull)) receive_blocking(uint8_t* destination, const size_t size);
static inline bool __attribute__((nonnull)) send(const uint8_t* source, const size_t size);
static inline bool initiate_transaction(uint8_t sstd_index);
static inline void usart_clear(void);
+static inline void usart_driver_start(void);
+
+#if HAL_USE_SERIAL
+
+/**
+ * @brief SERIAL Driver startup routine.
+ */
+static inline void usart_driver_start(void) {
+ sdStart(serial_driver, &serial_config);
+}
/**
* @brief Clear the receive input queue.
@@ -64,6 +67,45 @@ static inline void usart_clear(void) {
}
}
+#elif HAL_USE_SIO
+
+void clear_rx_evt_cb(SIODriver* siop) {
+ osalSysLockFromISR();
+ /* If errors occured during transactions this callback is invoked. We just
+ * clear the error sources and move on. We rely on the fact that we check
+ * for the success of the transaction by comparing the received/send bytes
+ * with the actual received/send bytes in the send/receive functions. */
+ sioGetAndClearEventsI(serial_driver);
+ osalSysUnlockFromISR();
+}
+
+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};
+
+/**
+ * @brief SIO Driver startup routine.
+ */
+static inline void usart_driver_start(void) {
+ sioStart(serial_driver, &serial_config);
+ sioStartOperation(serial_driver, &serial_usart_operation);
+}
+
+/**
+ * @brief Clear the receive input queue, as some MCUs have built-in hardware FIFOs.
+ */
+static inline void usart_clear(void) {
+ osalSysLock();
+ while (!sioIsRXEmptyX(serial_driver)) {
+ (void)sioGetX(serial_driver);
+ }
+ osalSysUnlock();
+}
+
+#else
+
+# error Either the SERIAL or SIO driver has to be activated to use the usart driver for split keyboards.
+
+#endif
+
/**
* @brief Blocking send of buffer with timeout.
*
@@ -71,15 +113,46 @@ static inline void usart_clear(void) {
* @return false Send failed.
*/
static inline bool send(const uint8_t* source, const size_t size) {
- bool success = (size_t)sdWriteTimeout(serial_driver, source, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
+ bool success = (size_t)chnWriteTimeout(serial_driver, source, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
#if !defined(SERIAL_USART_FULL_DUPLEX)
- if (success) {
- /* Half duplex fills the input queue with the data we wrote - just throw it away.
- Under the right circumstances (e.g. bad cables paired with high baud rates)
- less bytes can be present in the input queue, therefore a timeout is needed. */
- uint8_t dump[size];
- return receive(dump, size);
+ /* Half duplex fills the input queue with the data we wrote - just throw it away. */
+ if (likely(success)) {
+ size_t bytes_left = size;
+# if HAL_USE_SERIAL
+ /* The SERIAL driver uses large soft FIFOs that are filled from an IRQ
+ * context, so there is a delay between receiving the data and it
+ * becoming actually available, therefore we have to apply a timeout
+ * mechanism. Under the right circumstances (e.g. bad cables paired with
+ * high baud rates) less bytes can be present in the input queue as
+ * well. */
+ uint8_t dump[64];
+
+ while (unlikely(bytes_left >= 64)) {
+ if (unlikely(!receive(dump, 64))) {
+ return false;
+ }
+ bytes_left -= 64;
+ }
+
+ return receive(dump, bytes_left);
+# else
+ /* The SIO driver directly accesses the hardware FIFOs of the USART
+ * peripheral. As these are limited in depth, the RX FIFO might have been
+ * overflowed by a large that we just send. Therefore we attempt to read
+ * back all the data we send or until the FIFO runs empty in case it
+ * overflowed and data was truncated. */
+ if (unlikely(sioSynchronizeTXEnd(serial_driver, TIME_MS2I(SERIAL_USART_TIMEOUT)) < MSG_OK)) {
+ return false;
+ }
+
+ osalSysLock();
+ while (bytes_left > 0 && !sioIsRXEmptyX(serial_driver)) {
+ (void)sioGetX(serial_driver);
+ bytes_left--;
+ }
+ osalSysUnlock();
+# endif
}
#endif
@@ -90,10 +163,21 @@ static inline bool send(const uint8_t* source, const size_t size) {
* @brief Blocking receive of size * bytes with timeout.
*
* @return true Receive success.
- * @return false Receive failed.
+ * @return false Receive failed, e.g. by timeout.
*/
static inline bool receive(uint8_t* destination, const size_t size) {
- bool success = (size_t)sdReadTimeout(serial_driver, destination, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
+ bool success = (size_t)chnReadTimeout(serial_driver, destination, size, TIME_MS2I(SERIAL_USART_TIMEOUT)) == size;
+ return success;
+}
+
+/**
+ * @brief Blocking receive of size * bytes.
+ *
+ * @return true Receive success.
+ * @return false Receive failed.
+ */
+static inline bool receive_blocking(uint8_t* destination, const size_t size) {
+ bool success = (size_t)chnRead(serial_driver, destination, size) == size;
return success;
}
@@ -146,7 +230,7 @@ __attribute__((weak)) void usart_init(void) {
/**
* @brief Overridable master specific initializations.
*/
-__attribute__((weak, nonnull)) void usart_master_init(SerialDriver** driver) {
+__attribute__((weak, nonnull)) void usart_master_init(QMKSerialDriver** driver) {
(void)driver;
usart_init();
}
@@ -154,7 +238,7 @@ __attribute__((weak, nonnull)) void usart_master_init(SerialDriver** driver) {
/**
* @brief Overridable slave specific initializations.
*/
-__attribute__((weak, nonnull)) void usart_slave_init(SerialDriver** driver) {
+__attribute__((weak, nonnull)) void usart_slave_init(QMKSerialDriver** driver) {
(void)driver;
usart_init();
}
@@ -169,7 +253,7 @@ static THD_FUNCTION(SlaveThread, arg) {
chRegSetThreadName("usart_tx_rx");
while (true) {
- if (!react_to_transactions()) {
+ if (unlikely(!react_to_transactions())) {
/* Clear the receive queue, to start with a clean slate.
* Parts of failed transactions or spurious bytes could still be in it. */
usart_clear();
@@ -184,7 +268,7 @@ static THD_FUNCTION(SlaveThread, arg) {
void soft_serial_target_init(void) {
usart_slave_init(&serial_driver);
- sdStart(serial_driver, &serial_config);
+ usart_driver_start();
/* Start transport thread. */
chThdCreateStatic(waSlaveThread, sizeof(waSlaveThread), HIGHPRIO, SlaveThread, NULL);
@@ -195,10 +279,11 @@ void soft_serial_target_init(void) {
*/
static inline bool react_to_transactions(void) {
/* Wait until there is a transaction for us. */
- uint8_t sstd_index = (uint8_t)sdGet(serial_driver);
+ uint8_t sstd_index = 0;
+ receive_blocking(&sstd_index, sizeof(sstd_index));
/* Sanity check that we are actually responding to a valid transaction. */
- if (sstd_index >= NUM_TOTAL_TRANSACTIONS) {
+ if (unlikely(sstd_index >= NUM_TOTAL_TRANSACTIONS)) {
return false;
}
@@ -208,13 +293,13 @@ static inline bool react_to_transactions(void) {
/* Send back the handshake which is XORed as a simple checksum,
to signal that the slave is ready to receive possible transaction buffers */
sstd_index ^= HANDSHAKE_MAGIC;
- if (!send(&sstd_index, sizeof(sstd_index))) {
+ if (unlikely(!send(&sstd_index, sizeof(sstd_index)))) {
return false;
}
/* Receive transaction buffer from the master. If this transaction requires it.*/
if (trans->initiator2target_buffer_size) {
- if (!receive(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
+ if (unlikely(!receive(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size))) {
return false;
}
}
@@ -226,7 +311,7 @@ static inline bool react_to_transactions(void) {
/* Send transaction buffer to the master. If this transaction requires it. */
if (trans->target2initiator_buffer_size) {
- if (!send(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
+ if (unlikely(!send(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size))) {
return false;
}
}
@@ -244,7 +329,7 @@ void soft_serial_initiator_init(void) {
serial_config.cr2 |= USART_CR2_SWAP; // master has swapped TX/RX pins
#endif
- sdStart(serial_driver, &serial_config);
+ usart_driver_start();
}
/**
@@ -270,7 +355,7 @@ bool soft_serial_transaction(int index) {
*/
static inline bool initiate_transaction(uint8_t sstd_index) {
/* Sanity check that we are actually starting a valid transaction. */
- if (sstd_index >= NUM_TOTAL_TRANSACTIONS) {
+ if (unlikely(sstd_index >= NUM_TOTAL_TRANSACTIONS)) {
dprintln("USART: Illegal transaction Id.");
return false;
}
@@ -278,7 +363,7 @@ static inline bool initiate_transaction(uint8_t sstd_index) {
split_transaction_desc_t* trans = &split_transaction_table[sstd_index];
/* Send transaction table index to the slave, which doubles as basic handshake token. */
- if (!send(&sstd_index, sizeof(sstd_index))) {
+ if (unlikely(!send(&sstd_index, sizeof(sstd_index)))) {
dprintln("USART: Send Handshake failed.");
return false;
}
@@ -289,14 +374,14 @@ static inline bool initiate_transaction(uint8_t sstd_index) {
* - due to the half duplex limitations on return codes, we always have to read *something*.
* - without the read, write only transactions *always* succeed, even during the boot process where the slave is not ready.
*/
- if (!receive(&sstd_index_shake, sizeof(sstd_index_shake)) || (sstd_index_shake != (sstd_index ^ HANDSHAKE_MAGIC))) {
+ if (unlikely(!receive(&sstd_index_shake, sizeof(sstd_index_shake)) || (sstd_index_shake != (sstd_index ^ HANDSHAKE_MAGIC)))) {
dprintln("USART: Handshake failed.");
return false;
}
/* Send transaction buffer to the slave. If this transaction requires it. */
if (trans->initiator2target_buffer_size) {
- if (!send(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size)) {
+ if (unlikely(!send(split_trans_initiator2target_buffer(trans), trans->initiator2target_buffer_size))) {
dprintln("USART: Send failed.");
return false;
}
@@ -304,7 +389,7 @@ static inline bool initiate_transaction(uint8_t sstd_index) {
/* Receive transaction buffer from the slave. If this transaction requires it. */
if (trans->target2initiator_buffer_size) {
- if (!receive(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size)) {
+ if (unlikely(!receive(split_trans_target2initiator_buffer(trans), trans->target2initiator_buffer_size))) {
dprintln("USART: Receive failed.");
return false;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 03:53:32 +0000