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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2017-09-06 ���� first version
*/
// һЩ���õġ����õĽӿ�
/*
* ��ָ���Ĵ�����ָ��λ��1
* @reg �Ĵ�����ַ
* @bit ��Ҫ��1����һbit
*/
void reg_set_one_bit(volatile unsigned int *reg, unsigned int bit)
{
unsigned int temp, mask;
mask = 1 << bit;
temp = *reg;
temp |= mask;
*reg = temp;
return ;
}
/*
* ��ָ���Ĵ�����ָ��λ����
* @reg �Ĵ�����ַ
* @bit ��Ҫ�������һbit
*/
void reg_clr_one_bit(volatile unsigned int *reg, unsigned int bit)
{
unsigned int temp, mask;
mask = 1 << bit;
temp = *reg;
temp &= ~mask;
*reg = temp;
return ;
}
/*
* ��ȡָ���Ĵ�����ָ��λ��ֵ
* @reg �Ĵ�����ַ
* @bit ��Ҫ��ȡֵ����һbit
* @ret ָ��λ��ֵ
*/
unsigned int reg_get_bit(volatile unsigned int *reg, unsigned int bit)
{
unsigned int temp;
temp = *reg;
temp = (temp >> bit) & 1;
return temp;
}
/*
* ��Ĵ�����д��8bit(һ���ֽ�)����
* @data ��������
* @addr �Ĵ�����ַ
*/
void reg_write_8(unsigned char data, volatile unsigned char *addr)
{
*addr = data;
}
/*
* �ӼĴ�������8bit(һ���ֽ�)����
* @addr �Ĵ�����ַ
* @ret ����������
*/
unsigned char reg_read_8(volatile unsigned char *addr)
{
return (*addr);
}
/*
* ��Ĵ�����дһ��32bit������
* @data ��������
* @addr �Ĵ�����ַ
*/
void reg_write_32(unsigned int data, volatile unsigned int *addr)
{
*addr = data;
}
/*
* �ӼĴ�������һ��32bit����
* @addr �Ĵ�����ַ
* @ret ����������
*/
unsigned int reg_read_32(volatile unsigned int *addr)
{
return (*addr);
}
/**
* ffs - find first bit set
* @x: the word to search
*
* This is defined the same way as
* the libc and compiler builtin ffs routines, therefore
* differs in spirit from the above ffz (man ffs).
*/
int ls1c_ffs(int x)
{
int r = 1;
if (!x)
return 0;
if (!(x & 0xffff)) {
x >>= 16;
r += 16;
}
if (!(x & 0xff)) {
x >>= 8;
r += 8;
}
if (!(x & 0xf)) {
x >>= 4;
r += 4;
}
if (!(x & 3)) {
x >>= 2;
r += 2;
}
if (!(x & 1)) {
x >>= 1;
r += 1;
}
return r;
}
/*
* fls - find last (most-significant) bit set
* @x: the word to search
*
* This is defined the same way as ffs.
* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
*/
int ls1c_fls(int x)
{
int r = 32;
if (!x)
return 0;
if (!(x & 0xffff0000u))
{
x <<= 16;
r -= 16;
}
if (!(x & 0xff000000u))
{
x <<= 8;
r -= 8;
}
if (!(x & 0xf0000000u))
{
x <<= 4;
r -= 4;
}
if (!(x & 0xc0000000u))
{
x <<= 2;
r -= 2;
}
if (!(x & 0x80000000u))
{
x <<= 1;
r -= 1;
}
return r;
}
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