3f5dc47296
* Use polled waiting on platforms that support it Due to context switching overhead waiting a very short amount of time on a sleeping thread is often not accurate and in fact not usable for timing critical usage i.e. in a driver. Thus we use polled waiting for ranges in the us range on platforms that support it instead. The fallback is the thread sleeping mechanism. This includes: * ARM platforms with CYCCNT register (ARMv7, ARMv8) this is incremented at CPU clock frequency * GD32VF103 RISC-V port with CSR_MCYCLE register this is incremented at CPU clock frequency * RP2040 ARMv6 port which uses the integrated timer peripheral which is incremented with a fixed 1MHz frequency * Use wait_us() instead of chSysPolledDelayX ...as it is powered by busy waiting now. * Add chibios waiting methods test bench
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
// Copyright 2022 Stefan Kerkmann
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "quantum.h"
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#include "hal.h"
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#include "bootloader.h"
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#include "pico/bootrom.h"
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#if !defined(RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED)
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# define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED_MASK 0U
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#else
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# define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED_MASK (1U << RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED)
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#endif
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__attribute__((weak)) void mcu_reset(void) {
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NVIC_SystemReset();
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}
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void bootloader_jump(void) {
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reset_usb_boot(RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED_MASK, 0U);
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}
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void enter_bootloader_mode_if_requested(void) {}
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#if defined(RP2040_BOOTLOADER_DOUBLE_TAP_RESET)
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# if !defined(RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT)
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# define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 200U
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# endif
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// Needs to be located in a RAM section that is never initialized on boot to
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// preserve its value on reset
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static volatile uint32_t __attribute__((section(".ram0.bootloader_magic"))) magic_location;
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const uint32_t magic_token = 0xCAFEB0BA;
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// We can not use the __early_init / enter_bootloader_mode_if_requested hook as
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// we depend on an already initialized system with usable memory regions and
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// populated function pointer tables to the optimized math functions in the
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// bootrom. This function is called just prior to main.
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void __late_init(void) {
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// All clocks have to be enabled before jumping to the bootloader function,
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// otherwise the bootrom will be stuck infinitely.
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clocks_init();
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if (magic_location != magic_token) {
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magic_location = magic_token;
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// ChibiOS is not initialized at this point, so sleeping is only
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// possible via busy waiting.
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wait_us(RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT * 1000U);
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magic_location = 0;
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return;
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}
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magic_location = 0;
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reset_usb_boot(RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED_MASK, 0U);
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}
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#endif
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