SWO Output

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Patrik Bachan edited this page Oct 4, 2019 · 13 revisions

Basic SWO Output Configuration

Simple SWO ascii console, CPU running at 72MHz, SWO at 2MHz, SWO data comes from probe itself (eg. ST-LINK)

"swoConfig":{
    "enabled":true,
    "source":"probe",
    "swoFrequency": 2000000,
    "cpuFrequency":72000000,
    "decoders": [
        {
            "port": 0,
            "type": "console",
            "label": "SWO output",
            "encoding":"ascii"
        }
    ]
}

ARM basic config

This example expects CMSIS usage

Init

/* Select the SWO interface */
DBGMCU->CR &= DBGMCU_CR_TRACE_MODE_Msk;

/* Enable the TRACE interface */
DBGMCU->CR |= DBGMCU_CR_TRACE_IOEN;

Send character

ITM_SendChar(character);

Note: Don't forget to properly configure SWO pin.

Advanced Decoder Creation

Output Graphing