Jonne Valola / PokittoLib Featured

PokittoLib is the library needed for programming the Pokitto DIY game console (www.pokitto.com)

Dependents:   YATTT sd_map_test cPong SnowDemo ... more

PokittoLib

Library for programming Pokitto hardware

How to Use

  1. Import this library to online compiler (see button "import" on the right hand side
  2. DO NOT import mbed-src anymore, a better version is now included inside PokittoLib
  3. Change My_settings.h according to your project
  4. Start coding!

POKITTO_HW/clock_11u6x.c

Committer:
Pokitto
Date:
2019-12-25
Revision:
71:531419862202
Parent:
30:796f9611d2ac

File content as of revision 71:531419862202:

#include "clock_11u6x.h"


/* Inprecise clock rates for the watchdog oscillator */
STATIC const uint32_t wdtOSCRate[WDTLFO_OSC_4_60 + 1] = {
	0,					/* WDT_OSC_ILLEGAL */
	600000,				/* WDT_OSC_0_60 */
	1050000,			/* WDT_OSC_1_05 */
	1400000,			/* WDT_OSC_1_40 */
	1750000,			/* WDT_OSC_1_75 */
	2100000,			/* WDT_OSC_2_10 */
	2400000,			/* WDT_OSC_2_40 */
	2700000,			/* WDT_OSC_2_70 */
	3000000,			/* WDT_OSC_3_00 */
	3250000,			/* WDT_OSC_3_25 */
	3500000,			/* WDT_OSC_3_50 */
	3750000,			/* WDT_OSC_3_75 */
	4000000,			/* WDT_OSC_4_00 */
	4200000,			/* WDT_OSC_4_20 */
	4400000,			/* WDT_OSC_4_40 */
	4600000				/* WDT_OSC_4_60 */
};

/* Compute a PLL frequency */
STATIC uint32_t Chip_Clock_GetPLLFreq(uint32_t PLLReg, uint32_t inputRate)
{
	uint32_t msel = ((PLLReg & 0x1F) + 1);

	return inputRate * msel;
}

/* Return System PLL output clock rate */
uint32_t Chip_Clock_GetSystemPLLOutClockRate(void)
{
	return Chip_Clock_GetPLLFreq(LPC_SYSCTL->SYSPLLCTRL,
								 Chip_Clock_GetSystemPLLInClockRate());
}


/* Compute a WDT rate */
STATIC uint32_t Chip_Clock_GetWDTRate(uint32_t reg)
{
	uint32_t div;
	CHIP_WDTLFO_OSC_T clk;

	/* Get WDT oscillator settings */
	clk = (CHIP_WDTLFO_OSC_T) ((reg >> 5) & 0xF);
	div = reg & 0x1F;

	/* Compute clock rate and divided by divde value */
	return wdtOSCRate[clk] / ((div + 1) << 1);
}

/* Return estimated watchdog oscillator rate */
uint32_t Chip_Clock_GetWDTOSCRate(void)
{
	return Chip_Clock_GetWDTRate(LPC_SYSCTL->WDTOSCCTRL);
}


/* Return System PLL input clock rate */
uint32_t Chip_Clock_GetSystemPLLInClockRate(void)
{
	uint32_t clkRate;

	switch ((CHIP_SYSCTL_PLLCLKSRC_T) (LPC_SYSCTL->SYSPLLCLKSEL & 0x3)) {
	case SYSCTL_PLLCLKSRC_IRC:
		clkRate = Chip_Clock_GetIntOscRate();
		break;

	case SYSCTL_PLLCLKSRC_MAINOSC:
		clkRate = Chip_Clock_GetMainOscRate();
		break;

	case SYSCTL_PLLCLKSRC_RTC32K:
		clkRate = Chip_Clock_GetRTCOscRate();
		break;

	default:
		clkRate = 0;
	}

	return clkRate;
}


/* Return main clock rate */
uint32_t Chip_Clock_GetMainClockRate(void)
{
	uint32_t clkRate = 0;

	switch ((CHIP_SYSCTL_MAINCLKSRC_T) (LPC_SYSCTL->MAINCLKSEL & 0x3)) {
	case SYSCTL_MAINCLKSRC_IRC:
		clkRate = Chip_Clock_GetIntOscRate();
		break;

	case SYSCTL_MAINCLKSRC_PLLIN:
		clkRate = Chip_Clock_GetSystemPLLInClockRate();
		break;

	case SYSCTL_MAINCLKSRC_WDTOSC:
		clkRate = Chip_Clock_GetWDTOSCRate();
		break;

	case SYSCTL_MAINCLKSRC_PLLOUT:
		clkRate = Chip_Clock_GetSystemPLLOutClockRate();
		break;
	}

	return clkRate;
}

/* Return system clock rate */
uint32_t Chip_Clock_GetSystemClockRate(void)
{
	/* No point in checking for divide by 0 */
	return Chip_Clock_GetMainClockRate() / LPC_SYSCTL->SYSAHBCLKDIV;
}