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stm32f1: Use internal functions for early USB gpio toggle

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Avoid using the "low-level" library timing utilities.  This is in
preparation for using SysTick as part of the timer implementation.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2019-02-01 10:14:56 -05:00
parent 1096075d9b
commit eb8db46ca3
3 changed files with 24 additions and 6 deletions
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17
src/stm32f1/main.c
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@@ -5,6 +5,8 @@
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h"
#include "board/internal.h" // udelay
#include "board/misc.h" // timer_read_time
#include "command.h" // DECL_CONSTANT
#include "stm32f1xx.h"
#include "stm32f1xx_ll_system.h"
@@ -19,6 +21,7 @@
DECL_CONSTANT(MCU, "stm32f103");
/****************************************************************
* dynamic memory pool
****************************************************************/
@@ -128,6 +131,20 @@ void io_config(void)
LL_DBGMCU_SetTracePinAssignment(LL_DBGMCU_TRACE_NONE);
}
// Implement simple early-boot delay mechanism
void
udelay(uint32_t usecs)
{
if (!(CoreDebug->DEMCR & CoreDebug_DEMCR_TRCENA_Msk)) {
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
}
uint32_t end = timer_read_time() + timer_from_us(usecs);
while (timer_is_before(timer_read_time(), end))
;
}
// Main entry point
int
main(void)