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stm32/timing_stm32.c: Remove fixed constants and direct SCB access

This commit is contained in:
Uwe Bonnes 2020-03-27 12:26:20 +01:00 committed by UweBonnes
parent c4d7232223
commit 9ca401497c
1 changed files with 6 additions and 4 deletions
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10
src/platforms/stm32/timing_stm32.c
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@ -20,7 +20,8 @@
#include "morse.h" #include "morse.h"
#include <libopencm3/cm3/systick.h> #include <libopencm3/cm3/systick.h>
#include <libopencm3/cm3/scb.h> #include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/rcc.h>
uint8_t running_status; uint8_t running_status;
static volatile uint32_t time_ms; static volatile uint32_t time_ms;
@ -29,9 +30,10 @@ void platform_timing_init(void)
{ {
/* Setup heartbeat timer */ /* Setup heartbeat timer */
systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8); systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8);
systick_set_reload(900000); /* Interrupt us at 10 Hz */ /* Interrupt us at 10 Hz */
SCB_SHPR(11) &= ~((15 << 4) & 0xff); systick_set_reload(rcc_ahb_frequency / (8 * 10) );
SCB_SHPR(11) |= ((14 << 4) & 0xff); /* SYSTICK_IRQ with low priority */
nvic_set_priority(NVIC_SYSTICK_IRQ, 14 << 4);
systick_interrupt_enable(); systick_interrupt_enable();
systick_counter_enable(); systick_counter_enable();
} }