Tom Soulanille / RTOS-Serial

An RTOS-friendly Serial interface Its primary benefit is that it never hogs the CPU. An amusing alternative to the traditional ring-bufferd interrupt-serviced systems, it uses short mbed-rtos queues to buffer characters to and from the UART, and a thread to service the transmitter. Short interrupt service routines enqueue received characters and signal the transmit thread when the transmitter is available. WARNING: Do not create RTOS-Serial objects before the RTOS is running! Put them inside your main() block or another function, not in the global initialization.

Dependents:   Test_RDM880_rfid_reader

rtos_serial.h@12:be7883573c91, 2013-10-24 (annotated)

Committer:
altasoul
Date:
Thu Oct 24 17:30:52 2013 +0000
Revision:
12:be7883573c91
Parent:
11:bc067b42f8e0
Child:
13:2fb32235253c
checkpoint in bugfix of pre-allocated RTOS_Serial

Who changed what in which revision?

UserRevisionLine numberNew contents of line
altasoul 0:0547c8bf304f 1 /*
altasoul 0:0547c8bf304f 2 * Copyright (c) 2013 Tom Soulanille
altasoul 0:0547c8bf304f 3 *
altasoul 0:0547c8bf304f 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
altasoul 0:0547c8bf304f 5 * of this software and associated documentation files (the "Software"), to deal
altasoul 0:0547c8bf304f 6 * in the Software without restriction, including without limitation the rights
altasoul 0:0547c8bf304f 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
altasoul 0:0547c8bf304f 8 * copies of the Software, and to permit persons to whom the Software is
altasoul 0:0547c8bf304f 9 * furnished to do so, subject to the following conditions:
altasoul 0:0547c8bf304f 10 *
altasoul 0:0547c8bf304f 11 * The above copyright notice and this permission notice shall be included in
altasoul 0:0547c8bf304f 12 * all copies or substantial portions of the Software.
altasoul 0:0547c8bf304f 13 *
altasoul 0:0547c8bf304f 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
altasoul 0:0547c8bf304f 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
altasoul 0:0547c8bf304f 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
altasoul 0:0547c8bf304f 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
altasoul 0:0547c8bf304f 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
altasoul 0:0547c8bf304f 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
altasoul 0:0547c8bf304f 20 * SOFTWARE.
altasoul 0:0547c8bf304f 21 */
altasoul 0:0547c8bf304f 22
altasoul 0:0547c8bf304f 23 #ifndef RTOS_SERIAL_H
altasoul 0:0547c8bf304f 24 #define RTOS_SERIAL_H
altasoul 0:0547c8bf304f 25
altasoul 0:0547c8bf304f 26 #include "mbed.h"
altasoul 0:0547c8bf304f 27 #include "rtos.h"
altasoul 0:0547c8bf304f 28
altasoul 0:0547c8bf304f 29 #define MBED_RTOS_SERIAL_VERSION_MAJOR 0
altasoul 8:3644d12758da 30 #define MBED_RTOS_SERIAL_VERSION_MINOR 1
altasoul 11:bc067b42f8e0 31 #define MBED_RTOS_SERIAL_VERSION_EDIT 6
altasoul 0:0547c8bf304f 32
altasoul 9:b664b4f9f93d 33 #define RTOS_SERIAL_TX_THREAD 1
altasoul 12:be7883573c91 34 #define RTOS_SERIAL_TX_THREAD_STACK_SIZE 1024 /* FIXME: figure out good value */
altasoul 0:0547c8bf304f 35
altasoul 0:0547c8bf304f 36 /*
altasoul 0:0547c8bf304f 37 from Serial.h:
altasoul 0:0547c8bf304f 38 class Serial : public Stream {
altasoul 0:0547c8bf304f 39
altasoul 0:0547c8bf304f 40 public:
altasoul 0:0547c8bf304f 41 Serial(PinName tx, PinName rx, const char *name=NULL);
altasoul 0:0547c8bf304f 42 ...
altasoul 0:0547c8bf304f 43 protected:
altasoul 0:0547c8bf304f 44 ...
altasoul 0:0547c8bf304f 45 serial_t _serial;
altasoul 0:0547c8bf304f 46
altasoul 0:0547c8bf304f 47 from serial_api.h:
altasoul 0:0547c8bf304f 48 typedef struct serial_s serial_t;
altasoul 0:0547c8bf304f 49
altasoul 0:0547c8bf304f 50 from objects.h:
altasoul 0:0547c8bf304f 51 struct serial_s {
altasoul 0:0547c8bf304f 52 LPC_UART_TypeDef *uart;
altasoul 0:0547c8bf304f 53 int index;
altasoul 0:0547c8bf304f 54 };
altasoul 0:0547c8bf304f 55
altasoul 0:0547c8bf304f 56 from LPC17xx.h:
altasoul 0:0547c8bf304f 57 typedef struct
altasoul 0:0547c8bf304f 58 {
altasoul 0:0547c8bf304f 59 union {
altasoul 0:0547c8bf304f 60 __I uint8_t RBR;
altasoul 0:0547c8bf304f 61 __O uint8_t THR;
altasoul 0:0547c8bf304f 62 __IO uint8_t DLL;
altasoul 0:0547c8bf304f 63 uint32_t RESERVED0;
altasoul 0:0547c8bf304f 64 };
altasoul 0:0547c8bf304f 65 union {
altasoul 0:0547c8bf304f 66 __IO uint8_t DLM;
altasoul 0:0547c8bf304f 67 __IO uint32_t IER;
altasoul 0:0547c8bf304f 68 };
altasoul 0:0547c8bf304f 69 union {
altasoul 0:0547c8bf304f 70 __I uint32_t IIR;
altasoul 0:0547c8bf304f 71 __O uint8_t FCR;
altasoul 0:0547c8bf304f 72 };
altasoul 0:0547c8bf304f 73 __IO uint8_t LCR;
altasoul 0:0547c8bf304f 74 uint8_t RESERVED1[7];
altasoul 0:0547c8bf304f 75 __I uint8_t LSR;
altasoul 0:0547c8bf304f 76 uint8_t RESERVED2[7];
altasoul 0:0547c8bf304f 77 __IO uint8_t SCR;
altasoul 0:0547c8bf304f 78 uint8_t RESERVED3[3];
altasoul 0:0547c8bf304f 79 __IO uint32_t ACR;
altasoul 0:0547c8bf304f 80 __IO uint8_t ICR;
altasoul 0:0547c8bf304f 81 uint8_t RESERVED4[3];
altasoul 0:0547c8bf304f 82 __IO uint8_t FDR;
altasoul 0:0547c8bf304f 83 uint8_t RESERVED5[7];
altasoul 0:0547c8bf304f 84 __IO uint8_t TER;
altasoul 0:0547c8bf304f 85 uint8_t RESERVED6[39];
altasoul 0:0547c8bf304f 86 __IO uint32_t FIFOLVL;
altasoul 0:0547c8bf304f 87 } LPC_UART_TypeDef;
altasoul 0:0547c8bf304f 88
altasoul 0:0547c8bf304f 89 */
altasoul 0:0547c8bf304f 90
altasoul 12:be7883573c91 91 class RTOS_Serial : public RawSerial {
altasoul 0:0547c8bf304f 92 public:
altasoul 0:0547c8bf304f 93
altasoul 0:0547c8bf304f 94 RTOS_Serial(PinName tx, PinName rx, const char *name=NULL);
altasoul 0:0547c8bf304f 95 int putc(int c);
altasoul 7:dd892347b524 96 int getc();
altasoul 2:891773cc33fd 97 int puts(const char *s);
altasoul 0:0547c8bf304f 98 int get_index();
altasoul 11:bc067b42f8e0 99 int get_baud();
altasoul 2:891773cc33fd 100 Queue<int, 16> rx_q;
altasoul 12:be7883573c91 101 const char *name;
altasoul 12:be7883573c91 102
altasoul 0:0547c8bf304f 103 protected:
altasoul 0:0547c8bf304f 104 DigitalOut *ledp;
altasoul 5:5d388d1d7987 105 int uart_number;
altasoul 0:0547c8bf304f 106 Queue<int, 16> tx_q;
altasoul 0:0547c8bf304f 107 int parent_putc(int);
altasoul 1:5a66fddad7c4 108
altasoul 12:be7883573c91 109 static void threadStarter(void const *p);
altasoul 12:be7883573c91 110 void tx_emitter(void const *argument);
altasoul 12:be7883573c91 111
altasoul 12:be7883573c91 112 Thread _tx_thread;
altasoul 4:c7113cd0ac4b 113 Thread* tx_emitter_threadp;
altasoul 8:3644d12758da 114 void rx_isr();
altasoul 8:3644d12758da 115 void tx_isr();
altasoul 0:0547c8bf304f 116 };
altasoul 0:0547c8bf304f 117
altasoul 0:0547c8bf304f 118 #endif