I can't seem to get my L452RE-P board outputting on SWO at all in an empty project. The solder bridge is closed by default, so I don't think it is that. I'm using this code here but it doesn't seem to work at all:
void swoInit (uint32_t portMask, uint32_t cpuCoreFreqHz, uint32_t baudrate)
{
uint32_t SWOPrescaler = (cpuCoreFreqHz / baudrate) - 1u ; // baudrate in Hz, note that cpuCoreFreqHz is expected to match the CPU core clock
CoreDebug->DEMCR = CoreDebug_DEMCR_TRCENA_Msk; // Debug Exception and Monitor Control Register (DEMCR): enable trace in core debug
DBGMCU->CR = 0x00000027u ; // DBGMCU_CR : TRACE_IOEN DBG_STANDBY DBG_STOP DBG_SLEEP
TPI->SPPR = 0x00000002u ; // Selected PIN Protocol Register: Select which protocol to use for trace output (2: SWO)
TPI->ACPR = SWOPrescaler ; // Async Clock Prescaler Register: Scale the baud rate of the asynchronous output
ITM->LAR = 0xC5ACCE55u ; // ITM Lock Access Register: C5ACCE55 enables more write access to Control Register 0xE00 :: 0xFFC
ITM->TCR = 0x0001000Du ; // ITM Trace Control Register
ITM->TPR = ITM_TPR_PRIVMASK_Msk ; // ITM Trace Privilege Register: All stimulus ports
ITM->TER = portMask ; // ITM Trace Enable Register: Enabled tracing on stimulus ports. One bit per stimulus port.
DWT->CTRL = 0x400003FEu ; // Data Watchpoint and Trace Register
TPI->FFCR = 0x00000100u ; // Formatter and Flush Control Register
}
Based on the datasheet, this is all I should need to get it working. I'm using the default clock of the board since I haven't gotten past setting up SWO yet. Am I missing something?
