Lee Kai Xuan
mbed-os
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erkin yucel
Diff: drivers/CAN.h
- Revision:
- 0:f269e3021894
diff -r 000000000000 -r f269e3021894 drivers/CAN.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/CAN.h Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,262 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_CAN_H
+#define MBED_CAN_H
+
+#include "platform/platform.h"
+
+#if DEVICE_CAN
+
+#include "hal/can_api.h"
+#include "platform/Callback.h"
+#include "platform/PlatformMutex.h"
+
+namespace mbed {
+/** \addtogroup drivers */
+/** @{*/
+
+/** CANMessage class
+ *
+ * @Note Synchronization level: Thread safe
+ */
+class CANMessage : public CAN_Message {
+
+public:
+ /** Creates empty CAN message.
+ */
+ CANMessage() : CAN_Message() {
+ len = 8;
+ type = CANData;
+ format = CANStandard;
+ id = 0;
+ memset(data, 0, 8);
+ }
+
+ /** Creates CAN message with specific content.
+ */
+ CANMessage(int _id, const char *_data, char _len = 8, CANType _type = CANData, CANFormat _format = CANStandard) {
+ len = _len & 0xF;
+ type = _type;
+ format = _format;
+ id = _id;
+ memcpy(data, _data, _len);
+ }
+
+ /** Creates CAN remote message.
+ */
+ CANMessage(int _id, CANFormat _format = CANStandard) {
+ len = 0;
+ type = CANRemote;
+ format = _format;
+ id = _id;
+ memset(data, 0, 8);
+ }
+};
+
+/** A can bus client, used for communicating with can devices
+ */
+class CAN {
+
+public:
+ /** Creates an CAN interface connected to specific pins.
+ *
+ * @param rd read from transmitter
+ * @param td transmit to transmitter
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ *
+ * Ticker ticker;
+ * DigitalOut led1(LED1);
+ * DigitalOut led2(LED2);
+ * CAN can1(p9, p10);
+ * CAN can2(p30, p29);
+ *
+ * char counter = 0;
+ *
+ * void send() {
+ * if(can1.write(CANMessage(1337, &counter, 1))) {
+ * printf("Message sent: %d\n", counter);
+ * counter++;
+ * }
+ * led1 = !led1;
+ * }
+ *
+ * int main() {
+ * ticker.attach(&send, 1);
+ * CANMessage msg;
+ * while(1) {
+ * if(can2.read(msg)) {
+ * printf("Message received: %d\n\n", msg.data[0]);
+ * led2 = !led2;
+ * }
+ * wait(0.2);
+ * }
+ * }
+ * @endcode
+ */
+ CAN(PinName rd, PinName td);
+ virtual ~CAN();
+
+ /** Set the frequency of the CAN interface
+ *
+ * @param hz The bus frequency in hertz
+ *
+ * @returns
+ * 1 if successful,
+ * 0 otherwise
+ */
+ int frequency(int hz);
+
+ /** Write a CANMessage to the bus.
+ *
+ * @param msg The CANMessage to write.
+ *
+ * @returns
+ * 0 if write failed,
+ * 1 if write was successful
+ */
+ int write(CANMessage msg);
+
+ /** Read a CANMessage from the bus.
+ *
+ * @param msg A CANMessage to read to.
+ * @param handle message filter handle (0 for any message)
+ *
+ * @returns
+ * 0 if no message arrived,
+ * 1 if message arrived
+ */
+ int read(CANMessage &msg, int handle = 0);
+
+ /** Reset CAN interface.
+ *
+ * To use after error overflow.
+ */
+ void reset();
+
+ /** Puts or removes the CAN interface into silent monitoring mode
+ *
+ * @param silent boolean indicating whether to go into silent mode or not
+ */
+ void monitor(bool silent);
+
+ enum Mode {
+ Reset = 0,
+ Normal,
+ Silent,
+ LocalTest,
+ GlobalTest,
+ SilentTest
+ };
+
+ /** Change CAN operation to the specified mode
+ *
+ * @param mode The new operation mode (CAN::Normal, CAN::Silent, CAN::LocalTest, CAN::GlobalTest, CAN::SilentTest)
+ *
+ * @returns
+ * 0 if mode change failed or unsupported,
+ * 1 if mode change was successful
+ */
+ int mode(Mode mode);
+
+ /** Filter out incomming messages
+ *
+ * @param id the id to filter on
+ * @param mask the mask applied to the id
+ * @param format format to filter on (Default CANAny)
+ * @param handle message filter handle (Optional)
+ *
+ * @returns
+ * 0 if filter change failed or unsupported,
+ * new filter handle if successful
+ */
+ int filter(unsigned int id, unsigned int mask, CANFormat format = CANAny, int handle = 0);
+
+ /** Returns number of read errors to detect read overflow errors.
+ */
+ unsigned char rderror();
+
+ /** Returns number of write errors to detect write overflow errors.
+ */
+ unsigned char tderror();
+
+ enum IrqType {
+ RxIrq = 0,
+ TxIrq,
+ EwIrq,
+ DoIrq,
+ WuIrq,
+ EpIrq,
+ AlIrq,
+ BeIrq,
+ IdIrq,
+
+ IrqCnt
+ };
+
+ /** Attach a function to call whenever a CAN frame received interrupt is
+ * generated.
+ *
+ * @param func A pointer to a void function, or 0 to set as none
+ * @param event Which CAN interrupt to attach the member function to (CAN::RxIrq for message received, CAN::TxIrq for transmitted or aborted, CAN::EwIrq for error warning, CAN::DoIrq for data overrun, CAN::WuIrq for wake-up, CAN::EpIrq for error passive, CAN::AlIrq for arbitration lost, CAN::BeIrq for bus error)
+ */
+ void attach(Callback<void()> func, IrqType type=RxIrq);
+
+ /** Attach a member function to call whenever a CAN frame received interrupt
+ * is generated.
+ *
+ * @param obj pointer to the object to call the member function on
+ * @param method pointer to the member function to be called
+ * @param event Which CAN interrupt to attach the member function to (CAN::RxIrq for message received, TxIrq for transmitted or aborted, EwIrq for error warning, DoIrq for data overrun, WuIrq for wake-up, EpIrq for error passive, AlIrq for arbitration lost, BeIrq for bus error)
+ */
+ template<typename T>
+ void attach(T* obj, void (T::*method)(), IrqType type=RxIrq) {
+ // Underlying call thread safe
+ attach(Callback<void()>(obj, method), type);
+ }
+
+ /** Attach a member function to call whenever a CAN frame received interrupt
+ * is generated.
+ *
+ * @param obj pointer to the object to call the member function on
+ * @param method pointer to the member function to be called
+ * @param event Which CAN interrupt to attach the member function to (CAN::RxIrq for message received, TxIrq for transmitted or aborted, EwIrq for error warning, DoIrq for data overrun, WuIrq for wake-up, EpIrq for error passive, AlIrq for arbitration lost, BeIrq for bus error)
+ */
+ template<typename T>
+ void attach(T* obj, void (*method)(T*), IrqType type=RxIrq) {
+ // Underlying call thread safe
+ attach(Callback<void()>(obj, method), type);
+ }
+
+ static void _irq_handler(uint32_t id, CanIrqType type);
+
+protected:
+ virtual void lock();
+ virtual void unlock();
+ can_t _can;
+ Callback<void()> _irq[IrqCnt];
+ PlatformMutex _mutex;
+};
+
+} // namespace mbed
+
+#endif
+
+#endif // MBED_CAN_H
+
+/** @}*/