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CyH4TransportDriver.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2017-2017 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 
18 #ifndef CY_H4TRANSPORT_DRIVER_H_
19 #define CY_H4TRANSPORT_DRIVER_H_
20 
21 #if (DEVICE_SERIAL && DEVICE_SERIAL_FC) || defined(DOXYGEN_ONLY)
22 
23 #include <stdint.h>
24 #include "ble/driver/CordioHCITransportDriver.h"
25 #include "drivers/DigitalInOut.h"
26 #include "drivers/InterruptIn.h"
27 
28 #if defined(CYW43XXX_UNBUFFERED_UART)
29 #include "drivers/UnbufferedSerial.h"
30 #else
31 #include "cyhal_uart.h"
32 #endif
33 
34 namespace ble {
35 namespace vendor {
36 namespace cypress_ble {
37 
38 using namespace ble::vendor;
39 
40 /**
41  * Implementation of the H4 driver over Cypress based chips.
42  */
43 class CyH4TransportDriver : public CordioHCITransportDriver {
44 public:
45  /**
46  * Initialize the transport driver.
47  *
48  */
49  CyH4TransportDriver(PinName tx, PinName rx, PinName cts, PinName rts, PinName bt_power_name, int baud, PinName bt_host_wake_name, PinName bt_device_wake_name,
50  uint8_t host_wake_irq = 0, uint8_t dev_wake_irq = 0);
51  CyH4TransportDriver(PinName tx, PinName rx, PinName cts, PinName rts, PinName bt_power_name, int baud);
52 
53  /**
54  * Destructor
55  */
56  virtual ~CyH4TransportDriver();
57 
58  /**
59  * @see CordioHCITransportDriver::initialize
60  */
61  virtual void initialize();
62 
63  /**
64  * @see CordioHCITransportDriver::terminate
65  */
66  virtual void terminate();
67 
68  /**
69  * @see CordioHCITransportDriver::write
70  */
71  virtual uint16_t write(uint8_t type, uint16_t len, uint8_t *pData);
72 
73  void bt_host_wake_rise_irq_handler();
74  void bt_host_wake_fall_irq_handler();
75 
76 #if (defined(MBED_TICKLESS) && DEVICE_SLEEP && DEVICE_LPTICKER)
77  void on_host_stack_inactivity();
78 #endif
79 
80  void update_uart_baud_rate(int baud);
81 
82  bool get_enabled_powersave();
83  uint8_t get_host_wake_irq_event();
84  uint8_t get_dev_wake_irq_event();
85 
86 private:
87  void assert_bt_dev_wake();
88  void deassert_bt_dev_wake();
89 
90 #if defined(CYW43XXX_UNBUFFERED_UART)
91  void on_controller_irq();
92 #endif
93 
94  // Use HAL serial because Cypress UART is buffered.
95  // The PUTC function does not actually blocks until data is fully transmitted,
96  // it only blocks until data gets into HW buffer.
97  // The UART APIs prevents sleep while there are data in the HW buffer.
98  // However UART APIs does not prevent the BT radio from going to sleep.
99  // Use the HAL APIs to prevent the radio from going to sleep until UART transmition is complete.
100  // Mbed layer has no API that distinguish between data in HW buffer v.s. data already transmitted.
101 #if defined(CYW43XXX_UNBUFFERED_UART)
102  mbed::UnbufferedSerial uart;
103 #else
104  cyhal_uart_t uart;
105  PinName tx;
106  PinName rx;
107 #endif
108  PinName cts;
109  PinName rts;
110  PinName bt_host_wake_name;
111  PinName bt_device_wake_name;
112 
113  mbed::DigitalInOut bt_power;
114  mbed::DigitalInOut bt_host_wake;
115  mbed::DigitalInOut bt_device_wake;
116 
117  bool bt_host_wake_active;
118 
119 #if (defined(MBED_TICKLESS) && DEVICE_SLEEP && DEVICE_LPTICKER)
120  mbed::InterruptIn *host_wake_pin;
121 #endif
122 
123  bool enabled_powersave;
124  uint8_t host_wake_irq_event;
125  uint8_t dev_wake_irq_event;
126 };
127 
128 } // namespace cypress
129 } // namespace vendor
130 } // namespace ble
131 
132 #define DEF_BT_BAUD_RATE (115200)
133 #define DEF_BT_3M_BAUD_RATE (3000000) /* Both Host and BT device have to be adapt to this */
134 
135 #define WAKE_EVENT_ACTIVE_HIGH ( 1 ) /* Interrupt Rising Edge */
136 #define WAKE_EVENT_ACTIVE_LOW ( 0 ) /* Interrupt Falling Edge */
137 
138 ble::vendor::cypress_ble::CyH4TransportDriver& ble_cordio_get_default_h4_transport_driver();
139 ble::vendor::cypress_ble::CyH4TransportDriver& ble_cordio_get_h4_transport_driver();
140 #endif
141 #endif /* CY_H4TRANSPORT_DRIVER_H_ */
ble::CordioHCITransportDriver
Base class of the HCI transport driver.
Definition: CordioHCITransportDriver.h:29
ble::vendor::cypress_ble::CyH4TransportDriver
Implementation of the H4 driver over Cypress based chips.
Definition: CyH4TransportDriver.h:43
mbed::UnbufferedSerial
Class implementation for unbuffered I/O for an interrupt driven application or one that needs to have...
Definition: UnbufferedSerial.h:47
mbed::DigitalInOut
A digital input/output, used for setting or reading a bi-directional pin.
Definition: DigitalInOut.h:36
mbed::InterruptIn
A digital interrupt input, used to call a function on a rising or falling edge.
Definition: InterruptIn.h:65
ble
Entry namespace for all BLE API definitions.
Definition: CyH4TransportDriver.h:34
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