mbed-os/targets/TARGET_NUVOTON/TARGET_M480/mbed_overrides.c

134 lines
4.7 KiB
C

/*
* Copyright (c) 2015-2016, Nuvoton Technology Corporation
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "analogin_api.h"
void WDT_IRQHandler(void)
{
/* Check WDT interrupt flag */
if (WDT_GET_TIMEOUT_INT_FLAG()) {
WDT_CLEAR_TIMEOUT_INT_FLAG();
WDT_RESET_COUNTER();
}
/* Check WDT wake-up flag */
if (WDT_GET_TIMEOUT_WAKEUP_FLAG()) {
WDT_CLEAR_TIMEOUT_WAKEUP_FLAG();
}
}
void mbed_sdk_init(void)
{
// NOTE: Support singleton semantics to be called from other init functions
static int inited = 0;
if (inited) {
return;
}
inited = 1;
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Unlock protected registers */
SYS_UnlockReg();
/* Enable HIRC clock (Internal RC 22.1184MHz) */
CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
/* Enable HXT clock (external XTAL 12MHz) */
CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
/* Enable LIRC for lp_ticker */
CLK_EnableXtalRC(CLK_PWRCTL_LIRCEN_Msk);
/* Enable LXT for RTC */
CLK_EnableXtalRC(CLK_PWRCTL_LXTEN_Msk);
/* Wait for HIRC clock ready */
CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
/* Wait for HXT clock ready */
CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);
/* Wait for LIRC clock ready */
CLK_WaitClockReady(CLK_STATUS_LIRCSTB_Msk);
/* Wait for LXT clock ready */
CLK_WaitClockReady(CLK_STATUS_LXTSTB_Msk);
/* Select HCLK clock source as HIRC and HCLK clock divider as 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
/* Set core clock as 192000000 from PLL */
CLK_SetCoreClock(192000000);
/* Set PCLK0/PCLK1 to HCLK/2 */
CLK->PCLKDIV = (CLK_PCLKDIV_PCLK0DIV2 | CLK_PCLKDIV_PCLK1DIV2); // PCLK divider set 2
#if DEVICE_ANALOGIN
/* Vref connect to internal */
SYS->VREFCTL = (SYS->VREFCTL & ~SYS_VREFCTL_VREFCTL_Msk) | SYS_VREFCTL_VREF_3_0V;
#endif
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
SystemCoreClockUpdate();
/* Lock protected registers */
SYS_LockReg();
/* Get around h/w issue with reset from power-down mode
*
* When UART interrupt enabled and WDT reset from power-down mode, in the next
* cycle, UART interrupt keeps breaking in and cannot block unless via NVIC. To
* get around it, we make up a signal of WDT wake-up from power-down mode in the
* start of boot process on detecting WDT reset.
*/
if (SYS_IS_WDT_RST()) {
/* Enable IP module clock */
CLK_EnableModuleClock(WDT_MODULE);
/* Select IP clock source */
CLK_SetModuleClock(WDT_MODULE, CLK_CLKSEL1_WDTSEL_LIRC, 0);
/* The name of symbol WDT_IRQHandler() is mangled in C++ and cannot
* override that in startup file in C. Note the NVIC_SetVector call
* cannot be left out when WDT_IRQHandler() is redefined in C++ file.
*
* NVIC_SetVector(WDT_IRQn, (uint32_t) WDT_IRQHandler);
*/
NVIC_EnableIRQ(WDT_IRQn);
SYS_UnlockReg();
/* Configure/Enable WDT */
WDT->CTL = WDT_TIMEOUT_2POW4 | // Timeout interval of 2^4 LIRC clocks
WDT_CTL_WDTEN_Msk | // Enable watchdog timer
WDT_CTL_INTEN_Msk | // Enable interrupt
WDT_CTL_WKF_Msk | // Clear wake-up flag
WDT_CTL_WKEN_Msk | // Enable wake-up on timeout
WDT_CTL_IF_Msk | // Clear interrupt flag
WDT_CTL_RSTF_Msk | // Clear reset flag
!WDT_CTL_RSTEN_Msk | // Disable reset
WDT_CTL_RSTCNT_Msk; // Reset up counter
CLK_PowerDown();
/* Clear all flags & Disable WDT/INT/WK/RST */
WDT->CTL = (WDT_CTL_WKF_Msk | WDT_CTL_IF_Msk | WDT_CTL_RSTF_Msk | WDT_CTL_RSTCNT_Msk);
NVIC_DisableIRQ(WDT_IRQn);
SYS_LockReg();
}
}