Serial Wire Output (SWO) viewer for tracing purposes. Tested on F401 and ST-LINK Utility as well as for F103 and Segger J-Link SWO viewer.
Dependents: WiFi_Scanner mbed_nucleo_swo DISCO-F429ZI_LCDTS_demo_richard TEST_SM_SPEED
SWO.h@3:e5af2e131b95, 2014-12-23 (annotated)
- Committer:
- wim
- Date:
- Tue Dec 23 21:05:52 2014 +0000
- Revision:
- 3:e5af2e131b95
- Parent:
- 2:ef928f61a770
- Child:
- 4:53de8ef789f3
Added Class SWO_Channel that supports Stream putc() and printf().
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
wim | 1:bae4cff278f6 | 1 | /* mbed SWO Library |
wim | 1:bae4cff278f6 | 2 | * Copyright (c) 2014, v01: WH. Ported from Segger example |
wim | 3:e5af2e131b95 | 3 | * v02: WH. Added Class with Stream support |
wim | 1:bae4cff278f6 | 4 | * |
wim | 2:ef928f61a770 | 5 | * Simple implementation for tracing via Serial Wire Output(SWO) for Cortex-M processors. |
wim | 1:bae4cff278f6 | 6 | * It can be used with Host PC software such as ST-LINK Utility or Segger J-Link SWO viewer. |
wim | 1:bae4cff278f6 | 7 | * This sample implementation ensures that output via SWO is enabled in order to guarantee |
wim | 1:bae4cff278f6 | 8 | * that the application does not hang. |
wim | 1:bae4cff278f6 | 9 | * |
wim | 1:bae4cff278f6 | 10 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
wim | 1:bae4cff278f6 | 11 | * of this software and associated documentation files (the "Software"), to deal |
wim | 1:bae4cff278f6 | 12 | * in the Software without restriction, including without limitation the rights |
wim | 1:bae4cff278f6 | 13 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
wim | 1:bae4cff278f6 | 14 | * copies of the Software, and to permit persons to whom the Software is |
wim | 1:bae4cff278f6 | 15 | * furnished to do so, subject to the following conditions: |
wim | 1:bae4cff278f6 | 16 | * |
wim | 1:bae4cff278f6 | 17 | * The above copyright notice and this permission notice shall be included in |
wim | 1:bae4cff278f6 | 18 | * all copies or substantial portions of the Software. |
wim | 1:bae4cff278f6 | 19 | * |
wim | 1:bae4cff278f6 | 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
wim | 1:bae4cff278f6 | 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
wim | 1:bae4cff278f6 | 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
wim | 1:bae4cff278f6 | 23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
wim | 1:bae4cff278f6 | 24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
wim | 1:bae4cff278f6 | 25 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
wim | 1:bae4cff278f6 | 26 | * THE SOFTWARE. |
wim | 1:bae4cff278f6 | 27 | */ |
wim | 1:bae4cff278f6 | 28 | |
wim | 1:bae4cff278f6 | 29 | #ifndef MBED_SWO_H |
wim | 1:bae4cff278f6 | 30 | #define MBED_SWO_H |
wim | 0:0fd55660fc26 | 31 | |
wim | 3:e5af2e131b95 | 32 | // |
wim | 3:e5af2e131b95 | 33 | // This is the Class implementation |
wim | 3:e5af2e131b95 | 34 | // |
wim | 3:e5af2e131b95 | 35 | |
wim | 3:e5af2e131b95 | 36 | /** |
wim | 3:e5af2e131b95 | 37 | * @code |
wim | 3:e5af2e131b95 | 38 | * #include "mbed.h" |
wim | 3:e5af2e131b95 | 39 | * #include "SWO.h" |
wim | 3:e5af2e131b95 | 40 | * |
wim | 3:e5af2e131b95 | 41 | * DigitalOut myled(LED1); |
wim | 3:e5af2e131b95 | 42 | * |
wim | 3:e5af2e131b95 | 43 | * Serial pc(SERIAL_TX, SERIAL_RX); |
wim | 3:e5af2e131b95 | 44 | * |
wim | 3:e5af2e131b95 | 45 | * SWO_Channel SWO(); |
wim | 3:e5af2e131b95 | 46 | * |
wim | 3:e5af2e131b95 | 47 | * int main() { |
wim | 3:e5af2e131b95 | 48 | * pc.printf("Hello World\n\r"); |
wim | 3:e5af2e131b95 | 49 | * |
wim | 3:e5af2e131b95 | 50 | * SWO.printf("\r\nHello World from SWO\r\n"); |
wim | 3:e5af2e131b95 | 51 | * SWO.printf("CPU SystemCoreClock is %d Hz\r\n", SystemCoreClock); |
wim | 3:e5af2e131b95 | 52 | * |
wim | 3:e5af2e131b95 | 53 | * while(1) { |
wim | 3:e5af2e131b95 | 54 | * myled = 1; // LED is ON |
wim | 3:e5af2e131b95 | 55 | * wait(0.2); // 200 ms |
wim | 3:e5af2e131b95 | 56 | * myled = 0; // LED is OFF |
wim | 3:e5af2e131b95 | 57 | * wait(1.0); // 1 sec |
wim | 3:e5af2e131b95 | 58 | * |
wim | 3:e5af2e131b95 | 59 | * SWO.putc('#'); |
wim | 3:e5af2e131b95 | 60 | * } |
wim | 3:e5af2e131b95 | 61 | * } |
wim | 3:e5af2e131b95 | 62 | * @endcode |
wim | 3:e5af2e131b95 | 63 | */ |
wim | 3:e5af2e131b95 | 64 | |
wim | 3:e5af2e131b95 | 65 | /** An SWO interface for debugging that supports Stream |
wim | 3:e5af2e131b95 | 66 | * |
wim | 3:e5af2e131b95 | 67 | * @brief Currently works on nucleo ST-LINK using ST-Link Utility and other devices that support SWD/SWO using Segger SWO viewer |
wim | 3:e5af2e131b95 | 68 | * |
wim | 3:e5af2e131b95 | 69 | */ |
wim | 3:e5af2e131b95 | 70 | class SWO_Channel : public Stream { |
wim | 3:e5af2e131b95 | 71 | |
wim | 3:e5af2e131b95 | 72 | public: |
wim | 3:e5af2e131b95 | 73 | /** Create an SWO interface for debugging that supports Stream |
wim | 3:e5af2e131b95 | 74 | * |
wim | 3:e5af2e131b95 | 75 | */ |
wim | 3:e5af2e131b95 | 76 | SWO_Channel(); |
wim | 3:e5af2e131b95 | 77 | |
wim | 3:e5af2e131b95 | 78 | #if DOXYGEN_ONLY |
wim | 3:e5af2e131b95 | 79 | /** Write a character to the display |
wim | 3:e5af2e131b95 | 80 | * |
wim | 3:e5af2e131b95 | 81 | * @param c The character to write to the display |
wim | 3:e5af2e131b95 | 82 | */ |
wim | 3:e5af2e131b95 | 83 | int putc(int c); |
wim | 3:e5af2e131b95 | 84 | |
wim | 3:e5af2e131b95 | 85 | /** Write a formatted string to the display |
wim | 3:e5af2e131b95 | 86 | * |
wim | 3:e5af2e131b95 | 87 | * @param format A printf-style format string, followed by the |
wim | 3:e5af2e131b95 | 88 | * variables to use in formatting the string. |
wim | 3:e5af2e131b95 | 89 | */ |
wim | 3:e5af2e131b95 | 90 | int printf(const char* format, ...); |
wim | 3:e5af2e131b95 | 91 | #endif |
wim | 3:e5af2e131b95 | 92 | |
wim | 3:e5af2e131b95 | 93 | protected: |
wim | 3:e5af2e131b95 | 94 | // Stream implementation functions |
wim | 3:e5af2e131b95 | 95 | virtual int _putc(int value); |
wim | 3:e5af2e131b95 | 96 | virtual int _getc(); |
wim | 3:e5af2e131b95 | 97 | |
wim | 3:e5af2e131b95 | 98 | private: |
wim | 3:e5af2e131b95 | 99 | |
wim | 3:e5af2e131b95 | 100 | }; |
wim | 3:e5af2e131b95 | 101 | |
wim | 3:e5af2e131b95 | 102 | |
wim | 3:e5af2e131b95 | 103 | // |
wim | 3:e5af2e131b95 | 104 | //This is the classic implementation |
wim | 3:e5af2e131b95 | 105 | // |
wim | 3:e5af2e131b95 | 106 | |
wim | 1:bae4cff278f6 | 107 | /** |
wim | 1:bae4cff278f6 | 108 | * @code |
wim | 1:bae4cff278f6 | 109 | * #include "mbed.h" |
wim | 1:bae4cff278f6 | 110 | * #include "SWO.h" |
wim | 1:bae4cff278f6 | 111 | * |
wim | 1:bae4cff278f6 | 112 | * DigitalOut myled(LED1); |
wim | 1:bae4cff278f6 | 113 | * |
wim | 1:bae4cff278f6 | 114 | * Serial pc(SERIAL_TX, SERIAL_RX); |
wim | 1:bae4cff278f6 | 115 | * |
wim | 1:bae4cff278f6 | 116 | * int main() { |
wim | 1:bae4cff278f6 | 117 | * pc.printf("Hello World\n\r"); |
wim | 1:bae4cff278f6 | 118 | * |
wim | 1:bae4cff278f6 | 119 | * SWO_PrintString("\r\nHello World from SWO\r\n"); |
wim | 1:bae4cff278f6 | 120 | * char message[64]; |
wim | 1:bae4cff278f6 | 121 | * sprintf(message, "CPU SystemCoreClock is %d Hz\r\n", SystemCoreClock); |
wim | 1:bae4cff278f6 | 122 | * SWO_PrintString(message); |
wim | 1:bae4cff278f6 | 123 | * |
wim | 1:bae4cff278f6 | 124 | * while(1) { |
wim | 1:bae4cff278f6 | 125 | * myled = 1; // LED is ON |
wim | 1:bae4cff278f6 | 126 | * wait(0.2); // 200 ms |
wim | 1:bae4cff278f6 | 127 | * myled = 0; // LED is OFF |
wim | 1:bae4cff278f6 | 128 | * wait(1.0); // 1 sec |
wim | 1:bae4cff278f6 | 129 | * |
wim | 1:bae4cff278f6 | 130 | * SWO_PrintString("#"); |
wim | 1:bae4cff278f6 | 131 | * } |
wim | 1:bae4cff278f6 | 132 | * } |
wim | 1:bae4cff278f6 | 133 | * @endcode |
wim | 1:bae4cff278f6 | 134 | */ |
wim | 1:bae4cff278f6 | 135 | |
wim | 1:bae4cff278f6 | 136 | // Prototypes |
wim | 1:bae4cff278f6 | 137 | |
wim | 1:bae4cff278f6 | 138 | /** |
wim | 1:bae4cff278f6 | 139 | * @brief |
wim | 1:bae4cff278f6 | 140 | * Checks if SWO is set up. If it is not, return, |
wim | 1:bae4cff278f6 | 141 | * to avoid program hangs if no debugger is connected. |
wim | 1:bae4cff278f6 | 142 | * If it is set up, print a character to the ITM_STIM register |
wim | 1:bae4cff278f6 | 143 | * in order to provide data for SWO. |
wim | 1:bae4cff278f6 | 144 | * @param c The Character to be printed. |
wim | 1:bae4cff278f6 | 145 | * @notes Additional checks for device specific registers can be added. |
wim | 0:0fd55660fc26 | 146 | */ |
wim | 0:0fd55660fc26 | 147 | void SWO_PrintChar (char c); |
wim | 1:bae4cff278f6 | 148 | |
wim | 1:bae4cff278f6 | 149 | |
wim | 1:bae4cff278f6 | 150 | /** |
wim | 1:bae4cff278f6 | 151 | * |
wim | 1:bae4cff278f6 | 152 | * SWO_PrintString() |
wim | 1:bae4cff278f6 | 153 | * |
wim | 1:bae4cff278f6 | 154 | * @brief Print a string via SWO. |
wim | 1:bae4cff278f6 | 155 | * @param *s The string to be printed. |
wim | 1:bae4cff278f6 | 156 | */ |
wim | 0:0fd55660fc26 | 157 | void SWO_PrintString(const char *s); |
wim | 0:0fd55660fc26 | 158 | |
wim | 0:0fd55660fc26 | 159 | #endif |