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| author | Kevin O'Connor <kevin@koconnor.net> | 2019-02-01 10:14:56 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2019-02-06 22:03:09 -0500 |
| commit | eb8db46ca3dc23286da5cf5e1c23af2456080172 (patch) | |
| tree | a594111424e8a51ed3b5082254282cfb35524aef /src/stm32f1/main.c | |
| parent | 1096075d9b2d10302abd42cfdeef155f145f64e1 (diff) | |
| download | kutter-eb8db46ca3dc23286da5cf5e1c23af2456080172.tar.gz kutter-eb8db46ca3dc23286da5cf5e1c23af2456080172.tar.xz kutter-eb8db46ca3dc23286da5cf5e1c23af2456080172.zip | |
stm32f1: Use internal functions for early USB gpio toggle
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>
Diffstat (limited to 'src/stm32f1/main.c')
| -rw-r--r-- | src/stm32f1/main.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/stm32f1/main.c b/src/stm32f1/main.c index e7a0cd91..3abb03a3 100644 --- a/src/stm32f1/main.c +++ b/src/stm32f1/main.c @@ -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) |