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// Main starting point for LPC176x boards.
//
// Copyright (C) 2018-2021 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "autoconf.h" // CONFIG_CLOCK_FREQ
#include "board/armcm_boot.h" // armcm_main
#include "board/armcm_reset.h" // try_request_canboot
#include "board/irq.h" // irq_disable
#include "board/misc.h" // bootloader_request
#include "internal.h" // enable_pclock
#include "sched.h" // sched_main
/****************************************************************
* watchdog handler
****************************************************************/
void
watchdog_reset(void)
{
LPC_WDT->WDFEED = 0xaa;
LPC_WDT->WDFEED = 0x55;
}
DECL_TASK(watchdog_reset);
void
watchdog_init(void)
{
LPC_WDT->WDTC = 4000000 / 2; // 500ms timeout
LPC_WDT->WDCLKSEL = 1<<31; // Lock to internal RC
LPC_WDT->WDMOD = 0x03; // select reset and enable
watchdog_reset();
}
DECL_INIT(watchdog_init);
/****************************************************************
* misc functions
****************************************************************/
// Try to reboot into bootloader
void
bootloader_request(void)
{
if (!CONFIG_FLASH_APPLICATION_ADDRESS)
return;
try_request_canboot();
// Disable USB and pause for 5ms so host recognizes a disconnect
irq_disable();
if (CONFIG_USB)
usb_disconnect();
// The "LPC17xx-DFU-Bootloader" will enter the bootloader if the
// watchdog timeout flag is set.
LPC_WDT->WDMOD = 0x07;
NVIC_SystemReset();
}
// Check if a peripheral clock has been enabled
int
is_enabled_pclock(uint32_t pclk)
{
return !!(LPC_SC->PCONP & (1<<pclk));
}
// Enable a peripheral clock
void
enable_pclock(uint32_t pclk)
{
LPC_SC->PCONP |= 1<<pclk;
}
// Return the frequency of the given peripheral clock
uint32_t
get_pclock_frequency(uint32_t pclk)
{
return CONFIG_CLOCK_FREQ;
}
// Main entry point - called from armcm_boot.c:ResetHandler()
void
armcm_main(void)
{
SystemInit();
sched_main();
}
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