155 lines
4.3 KiB
C
155 lines
4.3 KiB
C
/*
|
||
* This file is part of the MicroPython project, http://micropython.org/
|
||
*
|
||
* The MIT License (MIT)
|
||
*
|
||
* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
|
||
* Copyright (c) 2019 Lucian Copeland for Adafruit Industries
|
||
*
|
||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
* of this software and associated documentation files (the "Software"), to deal
|
||
* in the Software without restriction, including without limitation the rights
|
||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
* copies of the Software, and to permit persons to whom the Software is
|
||
* furnished to do so, subject to the following conditions:
|
||
*
|
||
* The above copyright notice and this permission notice shall be included in
|
||
* all copies or substantial portions of the Software.
|
||
*
|
||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
* THE SOFTWARE.
|
||
*/
|
||
|
||
#include <stdint.h>
|
||
#include "supervisor/board.h"
|
||
#include "supervisor/port.h"
|
||
#include "supervisor/shared/tick.h"
|
||
#include "irq.h"
|
||
#include "csr.h"
|
||
|
||
#include "shared-bindings/microcontroller/__init__.h"
|
||
|
||
// Global millisecond tick count. 1024 per second because most RTCs are clocked with 32.768khz
|
||
// crystals.
|
||
volatile uint64_t raw_ticks = 0;
|
||
volatile int subsecond = 0;
|
||
void SysTick_Handler(void);
|
||
__attribute__((section(".ramtext")))
|
||
void SysTick_Handler(void) {
|
||
timer0_ev_pending_write(1);
|
||
raw_ticks += 1;
|
||
subsecond += 1;
|
||
// We track subsecond ticks so that we can increment raw_ticks one extra every 40 ms. We do this
|
||
// every 40 except 0 to make it 24 increments and not 25.
|
||
if (subsecond == 1000) {
|
||
subsecond = 0;
|
||
} else if (subsecond % 40 == 0) {
|
||
raw_ticks += 1;
|
||
}
|
||
supervisor_tick();
|
||
}
|
||
|
||
static void tick_init(void) {
|
||
int t;
|
||
|
||
timer0_en_write(0);
|
||
t = CONFIG_CLOCK_FREQUENCY / 1000; // 1000 kHz tick
|
||
timer0_reload_write(t);
|
||
timer0_load_write(t);
|
||
timer0_en_write(1);
|
||
timer0_ev_enable_write(1);
|
||
timer0_ev_pending_write(1);
|
||
irq_setmask(irq_getmask() | (1 << TIMER0_INTERRUPT));
|
||
}
|
||
|
||
safe_mode_t port_init(void) {
|
||
irq_setmask(0);
|
||
irq_setie(1);
|
||
tick_init();
|
||
return SAFE_MODE_NONE;
|
||
}
|
||
|
||
extern uint32_t _ebss;
|
||
extern uint32_t _heap_start;
|
||
extern uint32_t _estack;
|
||
|
||
void reset_port(void) {
|
||
// reset_all_pins();
|
||
// i2c_reset();
|
||
// spi_reset();
|
||
// uart_reset();
|
||
// pwmout_reset();
|
||
}
|
||
|
||
void reset_to_bootloader(void) {
|
||
reboot_ctrl_write(0xac);
|
||
for (;;) {}
|
||
}
|
||
|
||
void reset_cpu(void) {
|
||
// "You can reset Fomu by writing a special value to the CSR_REBOOT_CTRL
|
||
// register at 0xe0006000L. All writes to this register must start with
|
||
// 0xac, to ensure random values aren’t written. We can reboot Fomu by
|
||
// simply writing this value" --
|
||
// https://workshop.fomu.im/en/latest/riscv.html
|
||
reboot_ctrl_write(0xac);
|
||
for (;;) {}
|
||
}
|
||
|
||
bool port_has_fixed_stack(void) {
|
||
return false;
|
||
}
|
||
|
||
uint32_t *port_heap_get_bottom(void) {
|
||
return port_stack_get_limit();
|
||
}
|
||
|
||
uint32_t *port_heap_get_top(void) {
|
||
return port_stack_get_top();
|
||
}
|
||
|
||
uint32_t *port_stack_get_limit(void) {
|
||
return &_ebss;
|
||
}
|
||
|
||
uint32_t *port_stack_get_top(void) {
|
||
return &_estack;
|
||
}
|
||
|
||
// Place the word to save just after our BSS section that gets blanked.
|
||
void port_set_saved_word(uint32_t value) {
|
||
_ebss = value;
|
||
}
|
||
|
||
uint32_t port_get_saved_word(void) {
|
||
return _ebss;
|
||
}
|
||
|
||
uint64_t port_get_raw_ticks(uint8_t *subticks) {
|
||
// Reading 64 bits may take two loads, so turn of interrupts while we do it.
|
||
common_hal_mcu_disable_interrupts();
|
||
uint64_t raw_tick_snapshot = raw_ticks;
|
||
common_hal_mcu_enable_interrupts();
|
||
return raw_tick_snapshot;
|
||
}
|
||
|
||
// Enable 1/1024 second tick.
|
||
void port_enable_tick(void) {
|
||
}
|
||
|
||
// Disable 1/1024 second tick.
|
||
void port_disable_tick(void) {
|
||
}
|
||
|
||
void port_interrupt_after_ticks(uint32_t ticks) {
|
||
}
|
||
|
||
// TODO: Add sleep support if the SoC supports sleep.
|
||
void port_idle_until_interrupt(void) {
|
||
}
|