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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018-02-08 RT-Thread the first version
*/
void rt_low_level_init(void)
{
volatile unsigned int *addr;
volatile unsigned int time;
int i;
//change cpu clk source to 24M
addr = (unsigned int *)(0x01c20000 + 0x050);
*addr = 0x10000;
//init cpu pll clk 408M
addr = (unsigned int *)(0x01c20000 + 0x000);
*addr = 0x80001000;
time = 0xffff;
while ((!(*addr & (0x1 << 28))) && (time--));
//change cpu clk source to pll
if (time > 0)
{
addr = (unsigned int *)(0x01c20000 + 0x050);
*addr = 0x20000;
}
//init periph pll clk:600M
//init ahb pll clk:200M
//init apb pll clk:100M
addr = (unsigned int *)(0x01c20000 + 0x028);
if (*addr & (0x1 << 31))
return;
addr = (unsigned int *)(0x01c20000 + 0x200);
*addr = 0x1ff;
addr = (unsigned int *)(0x01c20000 + 0x204);
*addr = 0x1ff;
addr = (unsigned int *)(0x01c20000 + 0x028);
*addr |= (0x1 << 31);
while (!(*addr & (0x1 << 28)));
addr = (unsigned int *)(0x01c20000 + 0x054);
*addr = (0x0 << 16) | (0x3 << 12) | (0x0 << 8) | (0x2 << 6) | (0x0 << 4);
//init gpio config
for (i = 0; i < 6; i++)
{
if (i == 1)
continue;// not config gpio B
addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x00);
*addr = 0x77777777;
addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x04);
*addr = 0x77777777;
addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x08);
*addr = 0x77777777;
addr = (unsigned int *)(0x01c20800 + i * 0x24 + 0x0C);
*addr = 0x77777777;
}
}
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