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stm32-h103 examples: Cosmetic and coding style fixes.

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This commit is contained in:
Uwe Hermann
2011-11-03 00:57:46 +01:00
parent a3ce2924df
commit 44bf853e6e
16 changed files with 317 additions and 363 deletions
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3
examples/stm32/f1/stm32-h103/traceswo/README
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@@ -3,8 +3,7 @@ README
------------------------------------------------------------------------------
This experimental program sends some characters on the TRACESWO pin using
the Instrumentation Trace Macrocell (ITM) and Trace Port Interface
Unit (TPIU).
the Instrumentation Trace Macrocell (ITM) and Trace Port Interface Unit (TPIU).
The SWJ-DP port must be in SWD mode and not JTAG mode for the output
to be visible.

29
examples/stm32/f1/stm32-h103/traceswo/traceswo.c
View File

@@ -35,31 +35,30 @@ void clock_setup(void)
void trace_setup(void)
{
/* Enable trace subsystem (we'll use ITM and TPIU) */
/* Enable trace subsystem (we'll use ITM and TPIU). */
SCS_DEMCR |= SCS_DEMCR_TRCENA;
/* Use Manchester code for asynchronous transmission */
/* Use Manchester code for asynchronous transmission. */
TPIU_SPPR = TPIU_SPPR_ASYNC_MANCHESTER;
TPIU_ACPR = 7;
/* Data width is 1 byte */
/* Data width is 1 byte. */
TPIU_CSPSR = TPIU_CSPSR_BYTE;
/* Formatter and flush control */
/* Formatter and flush control. */
TPIU_FFCR &= ~TPIU_FFCR_ENFCONT;
/* Enable TRACESWO pin for async mode */
/* Enable TRACESWO pin for async mode. */
DBGMCU_CR = DBGMCU_CR_TRACE_IOEN | DBGMCU_CR_TRACE_MODE_ASYNC;
/* Unlock access to ITM registers */
/* Unlock access to ITM registers. */
/* FIXME: Magic numbers... Is this Cortex-M3 generic? */
*((volatile uint32_t*)0xE0000FB0) = 0xC5ACCE55;
*((volatile u32 *)0xE0000FB0) = 0xC5ACCE55;
/* Enable ITM with ID = 1 */
/* Enable ITM with ID = 1. */
ITM_TCR = (1 << 16) | ITM_TCR_ITMENA;
/* Enable stimulus port 1 */
ITM_TER[0] = 1;
/* Enable stimulus port 1. */
ITM_TER[0] = 1;
}
void gpio_setup(void)
@@ -71,7 +70,9 @@ void gpio_setup(void)
void trace_send_blocking(char c)
{
while(!(ITM_STIM[0] & ITM_STIM_FIFOREADY));
while (!(ITM_STIM[0] & ITM_STIM_FIFOREADY))
;
ITM_STIM[0] = c;
}
@@ -86,14 +87,14 @@ int main(void)
/* Blink the LED (PC12) on the board with every transmitted byte. */
while (1) {
gpio_toggle(GPIOC, GPIO12); /* LED on/off */
trace_send_blocking(c + '0');
trace_send_blocking(c + '0');
c = (c == 9) ? 0 : c + 1; /* Increment c. */
if ((j++ % 80) == 0) { /* Newline after line full. */
trace_send_blocking('\r');
trace_send_blocking('\n');
}
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("NOP");
__asm__("nop");
}
return 0;