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cc2538: Allow for configuration of processor speed

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This commit is contained in:
Ulf Knoblich 2015-05-12 14:06:40 +02:00
parent 730bda2001
commit d8efa8428c
7 changed files with 107 additions and 38 deletions
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26
cpu/cc2538/dev/sys-ctrl.c
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@ -70,17 +70,18 @@ sys_ctrl_init()
* 32KHz source: RC or crystal, according to SYS_CTRL_OSC32K_USE_XTAL
* System Clock: 32 MHz
* Power Down Unused
* I/O Div: 16MHz
* Sys Div: 16MHz
* I/O Div: according to SYS_CTRL_IO_DIV
* Sys Div: according to SYS_CTRL_SYS_DIV
* Rest: Don't care
*/
val = SYS_CTRL_OSCS | SYS_CTRL_CLOCK_CTRL_OSC_PD
| SYS_CTRL_CLOCK_CTRL_IO_DIV_16MHZ | SYS_CTRL_CLOCK_CTRL_SYS_DIV_16MHZ;
| SYS_CTRL_IO_DIV | SYS_CTRL_SYS_DIV;
REG(SYS_CTRL_CLOCK_CTRL) = val;
while((REG(SYS_CTRL_CLOCK_STA) & (SYS_CTRL_CLOCK_STA_OSC32K |
SYS_CTRL_CLOCK_STA_OSC)) != SYS_CTRL_OSCS);
while((REG(SYS_CTRL_CLOCK_STA)
& (SYS_CTRL_CLOCK_STA_OSC32K | SYS_CTRL_CLOCK_STA_OSC))
!= SYS_CTRL_OSCS);
#if SYS_CTRL_OSC32K_USE_XTAL
/* Wait for the 32-kHz crystal oscillator to stabilize */
@ -94,7 +95,20 @@ sys_ctrl_reset()
{
REG(SYS_CTRL_PWRDBG) = SYS_CTRL_PWRDBG_FORCE_WARM_RESET;
}
/*---------------------------------------------------------------------------*/
uint32_t
sys_ctrl_get_sys_clock(void)
{
return SYS_CTRL_32MHZ >> (REG(SYS_CTRL_CLOCK_STA) &
SYS_CTRL_CLOCK_STA_SYS_DIV);
}
/*---------------------------------------------------------------------------*/
uint32_t
sys_ctrl_get_io_clock(void)
{
return SYS_CTRL_32MHZ >> ((REG(SYS_CTRL_CLOCK_STA) &
SYS_CTRL_CLOCK_STA_IO_DIV) >> 8);
}
/**
* @}
* @}