82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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* File : rt_low_level_init.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2017, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2018-02-08 RT-Thread the first version
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*/
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void rt_low_level_init(void)
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{
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volatile unsigned int *addr;
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volatile unsigned int time;
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int i;
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//change cpu clk source to 24M
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addr = (unsigned int *)(0x01c20000 + 0x050);
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*addr = 0x10000;
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//init cpu pll clk 408M
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addr = (unsigned int *)(0x01c20000 + 0x000);
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*addr = 0x80001000;
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time = 0xffff;
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while ((!(*addr & (0x1 << 28))) && (time--));
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//change cpu clk source to pll
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if (time > 0)
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{
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addr = (unsigned int *)(0x01c20000 + 0x050);
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*addr = 0x20000;
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}
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//init periph pll clk:600M
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//init ahb pll clk:200M
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//init apb pll clk:100M
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addr = (unsigned int *)(0x01c20000 + 0x028);
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if (*addr & (0x1 << 31))
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return;
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addr = (unsigned int *)(0x01c20000 + 0x200);
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*addr = 0x1ff;
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addr = (unsigned int *)(0x01c20000 + 0x204);
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*addr = 0x1ff;
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addr = (unsigned int *)(0x01c20000 + 0x028);
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*addr |= (0x1 << 31);
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while (!(*addr & (0x1 << 28)));
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addr = (unsigned int *)(0x01c20000 + 0x054);
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*addr = (0x0 << 16) | (0x3 << 12) | (0x0 << 8) | (0x2 << 6) | (0x0 << 4);
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//init gpio config
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for (i = 0; i < 6; i++)
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{
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if (i == 1)
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continue;// not config gpio B
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addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x00);
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*addr = 0x77777777;
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addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x04);
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*addr = 0x77777777;
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addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x08);
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*addr = 0x77777777;
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addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x0C);
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*addr = 0x77777777;
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}
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}
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