Posted on March 26, 2014 at 20:06
Hello,
I cannot start SWO trace (nothing received in debug window) with STM32
W108CB. I have standard configuration of ITM, listed below. And i configured the 33 pin for SWO with line ''REG_GPIOC->CRL = 0x900;''.
Software used is uVision 4.76, jtag ULINK2.
static
int
Debug_ITMDebug = 0;
void
InitializeTrace(
void
)
{
volatile
uint *ITM_TER = (
volatile
uint *)0xE0000E00;
volatile
uint *SCB_DHCSR = (
volatile
uint *)0xE000EDF0;
*SCB_DHCSR = 0x30003;
*((
volatile
uint *)0xE000EDFC) = 0x01000000;
// ''Debug Exception and Monitor Control Register (DEMCR)''
*((
volatile
uint *)0xE0042004) = 0x00000027;
*((
volatile
uint *)0xE00400F0) = 0x00000002;
// ''Selected PIN Protocol Register'': Select which protocol to use for trace output (2: SWO)
*((
volatile
uint *)0xE0000FB0) = 0xC5ACCE55;
// ITM Lock Access Register, C5ACCE55 enables more write access to Control Register 0xE00 :: 0xFFC
*((
volatile
uint *)0xE0000E80) = 0x00010009;
// ITM Trace Control Register
*((
volatile
uint *)0xE0000E40) = 0x0000000F;
// ITM Trace Privilege Register
*((
volatile
uint *)0xE0000E00) = 0x00000001;
// ITM Trace Enable Register. Enabled tracing on stimulus ports. One bit per stimulus port.
*((
volatile
uint *)0xE0001000) = 0x400003FE;
// DWT_CTRL
*((
volatile
uint *)0xE0040304) = 0x00000100;
// Formatter and Flush Control Register
if
((*SCB_DHCSR & 1) && (*ITM_TER & 1))
// Enabled?
Debug_ITMDebug = 1;
}
void
TraceChar(
char
ch)
{
static
volatile
unsigned
int
*ITM_STIM0 = (
volatile
unsigned
int
*)0xE0000000;
// ITM Port 0
static
volatile
unsigned
int
*SCB_DEMCR = (
volatile
unsigned
int
*)0xE000EDFC;
if
(Debug_ITMDebug && (*SCB_DEMCR & 0x01000000))
{
while
(*ITM_STIM0 == 0);
*((
volatile
char
*)ITM_STIM0) = ch;
}
}
