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/*
* clk_gpio_init-mkl27z.c - Clock and GPIO initialization for Kinetis L.
*
* Copyright (C) 2016 Flying Stone Technology
* Author: NIIBE Yutaka <gniibe@fsij.org>
*
* This file is a part of Chopstx, a thread library for embedded.
*
* Chopstx 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.
*
* Chopstx 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 <http://www.gnu.org/licenses/>.
*
* As additional permission under GNU GPL version 3 section 7, you may
* distribute non-source form of the Program without the copy of the
* GNU GPL normally required by section 4, provided you inform the
* receipents of GNU GPL by a written offer.
*
*/
#include <mcu/mkl27z.h>
struct MCG {
volatile uint8_t C1; /* MCG Control Register 1 */
volatile uint8_t C2; /* MCG Control Register 2 */
uint8_t reserved0[4]; /* */
volatile uint8_t S; /* MCG Status Register */
uint8_t reserved1[1]; /* */
volatile uint8_t SC; /* MCG Status and Control Register */
uint8_t reserved2[15]; /* */
volatile uint8_t MC; /* MCG Miscellaneous Control Register */
};
static struct MCG *const MCG = (struct MCG *)0x40064000;
struct USB_CLK_RECOVER {
volatile uint8_t CTRL; /* USB Clock */
uint8_t rsvd38[3]; /* recovery control */
volatile uint8_t IRC_EN; /* IRC48M oscillator */
uint8_t rsvd39[3]; /* enable register */
volatile uint8_t INT_EN; /* Clock recovery */
uint8_t rsvd40[3]; /* interrupt enable */
volatile uint8_t INT_STATUS; /* Clock recovery */
/* interrupt status */
};
static struct USB_CLK_RECOVER *const USB_CLK_RECOVER =
(struct USB_CLK_RECOVER *)0x40072140;
static void __attribute__((used))
clock_init (void)
{
SIM->CLKDIV1 = (SIM->CLKDIV1 & 0xF0070000)
| (1 << 16) /* OUTDIV4 = 001: Divide-by-2 */
;
MCG->MC = 0x80; /* HIRC Enable, LIRC_DIV2=000: Division factor=1 */
MCG->C1 = 0x00; /* Select HIRC clock, LIRC disabled. */
/* Make sure HIRC clock is selected. */
while ((MCG->S & 0x0c) != 0)
;
/* TPMSRC=IRC48M, USBSRC=IRC48M, CLOKOUTSEL=LPO, RTC-clock */
SIM->SOPT2 = 0x01040060;
SIM->SCGC4 = (1 << 18); /* Enable USB FS clock */
SIM->SCGC5 = (1 << 10); /* Enable Port B clock */
SIM->SCGC6 = (1 << 25)|1; /* Enable TPM1 clock */
SIM->COPC = 0; /* COP disabled */
/* Crystal-less USB setup. */
USB_CLK_RECOVER->IRC_EN = 0x02;
USB_CLK_RECOVER->CTRL = 0x80;
}
static void __attribute__((used))
gpio_init (void)
{
PORTB->PCR0 = (1<<8) /* GPIO */
| (0<<6) /* DriveStrengthEnable=0 */
| (0<<4) /* PassiveFilterEnable=0 */
| (1<<2) /* SlewRateEnable = slow */
| (0<<1) /* pull enable = 0 */
| (0<<0) /* pull up select= 0 */
;
PORTB->PCR1 = (1<<8) /* GPIO */
| (0<<6) /* DriveStrengthEnable=0 */
| (0<<4) /* PassiveFilterEnable=0 */
| (1<<2) /* SlewRateEnable = slow */
| (0<<1) /* pull enable = 0 */
| (0<<0) /* pull up select= 0 */
;
GPIOB->PDDR = (1 << 1) | (1 << 0); /* PTB0, PTB1 : Output */
GPIOB->PSOR = (1 << 0); /* PTB0: Set : Light off */
GPIOB->PCOR = (1 << 1); /* PTB1: Clear: Output 0 */
}
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