diff options
| -rw-r--r-- | hw/bsp/board.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/hw/bsp/board.c b/hw/bsp/board.c index 0e0fa4ac6..4b8e5950f 100644 --- a/hw/bsp/board.c +++ b/hw/bsp/board.c @@ -64,13 +64,27 @@ int sys_read(int fhdl, char *buf, size_t count) { #endif #elif defined(LOGGER_SWO) + +#define ITM_BASE 0xE0000000 + +#define ITM_STIM0 (*((volatile uint8_t*)(ITM_BASE + 0))) +#define ITM_TER *((volatile uint32_t*)(ITM_BASE + 0xE00)) +#define ITM_TCR *((volatile uint32_t*)(ITM_BASE + 0xE80)) + +#define ITM_TCR_ITMENA (1 << 0) + // Logging with SWO for ARM Cortex-M int sys_write (int fhdl, const char *buf, size_t count) { (void) fhdl; uint8_t const* buf8 = (uint8_t const*) buf; - for(size_t i=0; i<count; i++) { - ITM_SendChar(buf8[i]); + if ((ITM_TCR & ITM_TCR_ITMENA) && (ITM_TER & 1ul)) { + for(size_t i=0; i < count; i++) { + while (!(ITM_STIM0 & 1ul)) { + asm("nop"); + } + ITM_STIM0 = buf8[i]; + } } return (int) count; |