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/*
* Copyright 2022 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "arch.h"
extern "C" {
#include <machine/wdtcon.h>
#include <tc1796b/scu.h>
#include <tc1796b/pmi.h>
}
#ifdef __acweaving
#define __delay_cycles(x)
#endif
#define OF_BYP 29
#define OF_NDIV 16
#define OF_PDIV 13
#define OF_KDIV 8
#define OF_VCOSEL 6
#define OF_SYSFS 2
#define STM_CLC (*(volatile unsigned int*)0xf0000200)
#define STM_TIM5 (*(volatile unsigned int*)0xf0000224)
void Arch::setup(void)
{
/*
* 20 MHz Crystal -> 150 MHz clock
* PLL_CLC := (NDIV = 29; PDIV = 0; KDIV = 3; VCOSEL = 2)
*/
unlock_wdtcon();
(*(unsigned int*)0xf0000040) = (29 << OF_NDIV) | (0 << OF_PDIV) | (3 << OF_KDIV) | (2 << OF_VCOSEL);
STM_CLC = 0x00000100;
lock_wdtcon();
}
#if defined(CONFIG_loop)
extern void loop();
unsigned int old_tim5 = 0;
#endif
volatile bool sleep_done = false;
void Arch::sleep_ms(unsigned int const ms)
{
delay_ms(ms);
}
void Arch::delay_us(unsigned int const us)
{
for (unsigned int i = 0; i < us; i++) {
for (unsigned int c = 0; c < F_CPU/1000000; c++) {
asm volatile("nop");
}
}
}
void Arch::delay_ms(unsigned int const ms)
{
for (unsigned int i = 0; i < ms; i++) {
for (unsigned int c = 0; c < F_CPU/1000; c++) {
asm volatile("nop");
}
}
}
void Arch::idle_loop(void)
{
while (1) {
#if defined(CONFIG_loop)
// STM_TIM5 will overflow once every 1.9 years.
if ((STM_TIM5 - old_tim5 > 70) || (old_tim5 > STM_TIM5)) {
old_tim5 = STM_TIM5;
loop();
}
#endif
}
}
void Arch::idle(void)
{
}
Arch arch;
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