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rcc: Add a few functions to set prescalers.

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Thanks Thomas Otto <tommi@viadmin.org> for the patch!
This commit is contained in:
Uwe Hermann 2010-01-19 19:57:38 +01:00
parent 92dc4c361e
commit 3e29876d98
2 changed files with 49 additions and 0 deletions
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5
include/libopenstm32/rcc.h
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@ -386,5 +386,10 @@ void rcc_set_sysclk_source(u32 clk);
void rcc_set_pll_multiplication_factor(u32 mul);
void rcc_set_pll_source(u32 pllsrc);
void rcc_set_pllxtpre(u32 pllxtpre);
void rcc_set_adcpre(u32 adcpre);
void rcc_set_ppre2(u32 ppre2);
void rcc_set_ppre1(u32 ppre1);
void rcc_set_hpre(u32 hpre);
u32 rcc_get_system_clock_source(int i);
#endif

44
lib/rcc.c
View File

@ -3,6 +3,8 @@
*
* Copyright (C) 2009 Federico Ruiz-Ugalde <memeruiz at gmail dot com>
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
*
*
* 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
@ -279,3 +281,45 @@ void rcc_set_pllxtpre(u32 pllxtpre)
reg32 &= ~(1 << 17);
RCC_CFGR = (reg32 | (pllxtpre << 17));
}
void rcc_set_adcpre(u32 adcpre)
{
u32 reg32;
reg32 = RCC_CFGR;
reg32 &= ((1 << 14) | (1 << 15));
RCC_CFGR = (reg32 | (adcpre << 14));
}
void rcc_set_ppre2(u32 ppre2)
{
u32 reg32;
reg32 = RCC_CFGR;
reg32 &= ((1 << 11) | (1 << 12) | (1 << 13));
RCC_CFGR = (reg32 | (ppre2 << 11));
}
void rcc_set_ppre1(u32 ppre1)
{
u32 reg32;
reg32 = RCC_CFGR;
reg32 &= ((1 << 8) | (1 << 9) | (1 << 10));
RCC_CFGR = (reg32 | (ppre1 << 8));
}
void rcc_set_hpre(u32 hpre)
{
u32 reg32;
reg32 = RCC_CFGR;
reg32 &= ((1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
RCC_CFGR = (reg32 | (hpre << 4));
}
u32 rcc_system_clock_source(void)
{
/* Return the clock source which is used as system clock. */
return ((RCC_CFGR & 0x000c) >> 2);
}