mac-rom-simm-programmer/hal/m258ke/board.c

84 lines
2.3 KiB
C
Raw Permalink Normal View History

2023-08-07 03:35:29 +00:00
/*
* board.c
*
* Created on: Jun 19, 2023
* Author: Doug
*
* Copyright (C) 2011-2023 Doug Brown
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#include "board_hw.h"
/** Initializes any board hardware-specific stuff
*
*/
void Board_Init(void)
{
// Unlock protected registers so we can configure clocks, flash, WDT, etc.
do
{
SYS->REGLCTL = 0x59UL;
SYS->REGLCTL = 0x16UL;
SYS->REGLCTL = 0x88UL;
} while (SYS->REGLCTL == 0UL);
// Enable 48 MHz internal high-speed RC oscillator
CLK->PWRCTL |= CLK_PWRCTL_HIRCEN_Msk;
// Wait until it's ready
while (!(CLK->STATUS & CLK_STATUS_HIRCSTB_Msk));
// Clock HCLK and USB from 48 MHz HIRC
CLK->CLKSEL0 = (CLK->CLKSEL0 & (~(CLK_CLKSEL0_HCLKSEL_Msk | CLK_CLKSEL0_USBDSEL_Msk))) |
(7 << CLK_CLKSEL0_HCLKSEL_Pos) | (0 << CLK_CLKSEL0_USBDSEL_Pos);
// SystemCoreClock, CyclesPerUs, CyclesPerUs default to correct values already
// Enable USB device controller
CLK->APBCLK0 |= CLK_APBCLK0_USBDCKEN_Msk;
2023-08-07 03:35:29 +00:00
// Enable timer 0
CLK->APBCLK0 |= CLK_APBCLK0_TMR0CKEN_Msk;
// Timer 0 clock source = 48 MHz HIRC
CLK->CLKSEL1 = (CLK->CLKSEL1 & (~(CLK_CLKSEL1_TMR0SEL_Msk))) | (7UL << CLK_CLKSEL1_TMR0SEL_Pos);
2023-08-07 03:35:29 +00:00
// Enable all GPIO
CLK->AHBCLK |=
CLK_AHBCLK_GPACKEN_Msk |
CLK_AHBCLK_GPBCKEN_Msk |
CLK_AHBCLK_GPCCKEN_Msk |
CLK_AHBCLK_GPDCKEN_Msk |
CLK_AHBCLK_GPECKEN_Msk |
CLK_AHBCLK_GPFCKEN_Msk;
2023-08-07 03:35:29 +00:00
// Start the timer, prescaler = 48, so 1 MHz
TIMER0->CTL = TIMER_CTL_CNTEN_Msk | (3UL << TIMER_CTL_OPMODE_Pos) | 47;
// Disable WDT now; the main firmware is booted.
WDT->CTL = (6 << WDT_CTL_TOUTSEL_Pos);
2023-08-07 03:35:29 +00:00
}
/** Determines if a brownout was detected at startup
*
* @return True if a brownout was detected
*/
bool Board_BrownoutDetected(void)
{
return false;
}