For what it is worth I have managed to get SWV up-and-running in IAR Embedded Workbench using a SEGGER J-Link debugger. Admittedly on a proprietary board but IIRC the kit has a SWV trace line connected on a standard 10-pin Cortex SWD programming header.
The main stumbling block was to correctly configure the MCU for SWV output. Below is my present set-up, more or less, as massaged from a Cypress sample which should be floating around somewhere. Here DIVIDER divides the bus clock to yield the UART-mode trace frequency:
*(volatile uint32_t *) CYREG_CORE_DBG_EXC_MON_CTL = 0x01000000;
*(volatile uint8_t *) CYREG_MLOGIC_DEBUG = 0x0C;
*(volatile uint32_t *) CYREG_ITM_LOCK_ACCESS = 0xC5ACCE55;
*(volatile uint32_t *) CYREG_ITM_TRACE_CTRL = 0x15;
*(volatile uint32_t *) CYREG_TPIU_ASYNC_CLK_PRESCALER = DIVIDER / 2 - 1;
*(volatile uint8_t *) CYREG_TPIU_PROTOCOL = 0x02;
*(volatile uint32_t *) CYREG_ITM_TRACE_EN = 0xFFFFFFFF;
*(volatile uint16_t *) CYREG_ETM_SYNC_FREQ = 0x0100;
*(volatile uint32_t *) CYREG_TPIU_FORM_FLUSH_CTRL = 0x00000000;
...
void SWV_PutChar(char ch) {
while(!*(const volatile uint8_t *) CYDEV_ITM_BASE));
*(volatile uint8_t *) CYDEV_ITM_BASE = ch;
}
After that configuring IAR to receive SWV traces on correct channel and frequency yielded the expected results. Admittedly only at moderate frequencies up to 7 MHz or so and not for fast unintrusive manchester-encoded ones as yet. Beyond that I also had some initial issues with a damaged PSoC mostly working but hard-faulting soon after enabling SWV.
