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1 // Copyright (c) 2015, the Dartino project authors. Please see the AUTHORS file | |
2 // for details. All rights reserved. Use of this source code is governed by a | |
3 // BSD-style license that can be found in the LICENSE.md file. | |
4 | |
5 #ifndef PLATFORMS_STM_DISCO_FLETCH_SRC_UART_H_ | |
6 #define PLATFORMS_STM_DISCO_FLETCH_SRC_UART_H_ | |
7 | |
8 #include <inttypes.h> | |
9 | |
10 #include <cmsis_os.h> | |
11 #include <stm32f7xx_hal.h> | |
12 | |
13 #include "platforms/stm/disco_fletch/src/circular_buffer.h" | |
14 | |
15 // Interface to the universal asynchronous receiver/transmitter | |
16 // (UART). | |
17 class Uart { | |
18 public: | |
19 // Access the UART on the first UART port. | |
20 Uart(); | |
21 | |
22 // Start processing the UART. | |
23 void Start(); | |
24 | |
25 // Read up to count bytes from the UART into the buffer starting at | |
26 // buffer. | |
27 // | |
28 // This will block until at least one byte can be read. | |
29 size_t Read(uint8_t* buffer, size_t count); | |
30 | |
31 | |
32 // Read up to count bytes from the buffer starting at buffer to the | |
33 // UART. | |
34 // | |
35 // This will block until at least one byte can be written. | |
36 size_t Write(const uint8_t* buffer, size_t count); | |
37 | |
38 private: | |
39 static const int kTxBlockSize = 10; | |
40 | |
41 void Task(); | |
42 | |
43 void EnsureTransmission(); | |
44 | |
45 UART_HandleTypeDef* uart_; | |
46 int error_count_; | |
47 osSemaphoreDef(semaphore_def_); | |
48 osSemaphoreId(semaphore_); | |
49 | |
50 // Receive status. | |
51 uint8_t rx_data_; // The one byte received at the time. | |
52 CircularBuffer* rx_buffer_; | |
53 | |
54 // Transmit status. | |
55 fletch::Mutex* tx_mutex_; | |
56 uint8_t tx_data_[kTxBlockSize]; // Buffer send to the HAL. | |
57 bool tx_pending_; | |
58 CircularBuffer* tx_buffer_; | |
59 | |
60 friend void __UartTask(const void*); | |
61 }; | |
62 | |
63 #endif // PLATFORMS_STM_DISCO_FLETCH_SRC_UART_H_ | |
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