spinal cord / PokittoLib_

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

POKITTO_HW/clock_11u6x.c@64:6e6c6c2b664e, 2018-11-18 (annotated)

Committer:
spinal
Date:
Sun Nov 18 15:47:54 2018 +0000
Revision:
64:6e6c6c2b664e
Parent:
30:796f9611d2ac 
added fix for directrectangle()

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Pokitto 30:796f9611d2ac 1 #include "clock_11u6x.h"
Pokitto 30:796f9611d2ac 2
Pokitto 30:796f9611d2ac 3
Pokitto 30:796f9611d2ac 4 /* Inprecise clock rates for the watchdog oscillator */
Pokitto 30:796f9611d2ac 5 STATIC const uint32_t wdtOSCRate[WDTLFO_OSC_4_60 + 1] = {
Pokitto 30:796f9611d2ac 6 0, /* WDT_OSC_ILLEGAL */
Pokitto 30:796f9611d2ac 7 600000, /* WDT_OSC_0_60 */
Pokitto 30:796f9611d2ac 8 1050000, /* WDT_OSC_1_05 */
Pokitto 30:796f9611d2ac 9 1400000, /* WDT_OSC_1_40 */
Pokitto 30:796f9611d2ac 10 1750000, /* WDT_OSC_1_75 */
Pokitto 30:796f9611d2ac 11 2100000, /* WDT_OSC_2_10 */
Pokitto 30:796f9611d2ac 12 2400000, /* WDT_OSC_2_40 */
Pokitto 30:796f9611d2ac 13 2700000, /* WDT_OSC_2_70 */
Pokitto 30:796f9611d2ac 14 3000000, /* WDT_OSC_3_00 */
Pokitto 30:796f9611d2ac 15 3250000, /* WDT_OSC_3_25 */
Pokitto 30:796f9611d2ac 16 3500000, /* WDT_OSC_3_50 */
Pokitto 30:796f9611d2ac 17 3750000, /* WDT_OSC_3_75 */
Pokitto 30:796f9611d2ac 18 4000000, /* WDT_OSC_4_00 */
Pokitto 30:796f9611d2ac 19 4200000, /* WDT_OSC_4_20 */
Pokitto 30:796f9611d2ac 20 4400000, /* WDT_OSC_4_40 */
Pokitto 30:796f9611d2ac 21 4600000 /* WDT_OSC_4_60 */
Pokitto 30:796f9611d2ac 22 };
Pokitto 30:796f9611d2ac 23
Pokitto 30:796f9611d2ac 24 /* Compute a PLL frequency */
Pokitto 30:796f9611d2ac 25 STATIC uint32_t Chip_Clock_GetPLLFreq(uint32_t PLLReg, uint32_t inputRate)
Pokitto 30:796f9611d2ac 26 {
Pokitto 30:796f9611d2ac 27 uint32_t msel = ((PLLReg & 0x1F) + 1);
Pokitto 30:796f9611d2ac 28
Pokitto 30:796f9611d2ac 29 return inputRate * msel;
Pokitto 30:796f9611d2ac 30 }
Pokitto 30:796f9611d2ac 31
Pokitto 30:796f9611d2ac 32 /* Return System PLL output clock rate */
Pokitto 30:796f9611d2ac 33 uint32_t Chip_Clock_GetSystemPLLOutClockRate(void)
Pokitto 30:796f9611d2ac 34 {
Pokitto 30:796f9611d2ac 35 return Chip_Clock_GetPLLFreq(LPC_SYSCTL->SYSPLLCTRL,
Pokitto 30:796f9611d2ac 36 Chip_Clock_GetSystemPLLInClockRate());
Pokitto 30:796f9611d2ac 37 }
Pokitto 30:796f9611d2ac 38
Pokitto 30:796f9611d2ac 39
Pokitto 30:796f9611d2ac 40 /* Compute a WDT rate */
Pokitto 30:796f9611d2ac 41 STATIC uint32_t Chip_Clock_GetWDTRate(uint32_t reg)
Pokitto 30:796f9611d2ac 42 {
Pokitto 30:796f9611d2ac 43 uint32_t div;
Pokitto 30:796f9611d2ac 44 CHIP_WDTLFO_OSC_T clk;
Pokitto 30:796f9611d2ac 45
Pokitto 30:796f9611d2ac 46 /* Get WDT oscillator settings */
Pokitto 30:796f9611d2ac 47 clk = (CHIP_WDTLFO_OSC_T) ((reg >> 5) & 0xF);
Pokitto 30:796f9611d2ac 48 div = reg & 0x1F;
Pokitto 30:796f9611d2ac 49
Pokitto 30:796f9611d2ac 50 /* Compute clock rate and divided by divde value */
Pokitto 30:796f9611d2ac 51 return wdtOSCRate[clk] / ((div + 1) << 1);
Pokitto 30:796f9611d2ac 52 }
Pokitto 30:796f9611d2ac 53
Pokitto 30:796f9611d2ac 54 /* Return estimated watchdog oscillator rate */
Pokitto 30:796f9611d2ac 55 uint32_t Chip_Clock_GetWDTOSCRate(void)
Pokitto 30:796f9611d2ac 56 {
Pokitto 30:796f9611d2ac 57 return Chip_Clock_GetWDTRate(LPC_SYSCTL->WDTOSCCTRL);
Pokitto 30:796f9611d2ac 58 }
Pokitto 30:796f9611d2ac 59
Pokitto 30:796f9611d2ac 60
Pokitto 30:796f9611d2ac 61 /* Return System PLL input clock rate */
Pokitto 30:796f9611d2ac 62 uint32_t Chip_Clock_GetSystemPLLInClockRate(void)
Pokitto 30:796f9611d2ac 63 {
Pokitto 30:796f9611d2ac 64 uint32_t clkRate;
Pokitto 30:796f9611d2ac 65
Pokitto 30:796f9611d2ac 66 switch ((CHIP_SYSCTL_PLLCLKSRC_T) (LPC_SYSCTL->SYSPLLCLKSEL & 0x3)) {
Pokitto 30:796f9611d2ac 67 case SYSCTL_PLLCLKSRC_IRC:
Pokitto 30:796f9611d2ac 68 clkRate = Chip_Clock_GetIntOscRate();
Pokitto 30:796f9611d2ac 69 break;
Pokitto 30:796f9611d2ac 70
Pokitto 30:796f9611d2ac 71 case SYSCTL_PLLCLKSRC_MAINOSC:
Pokitto 30:796f9611d2ac 72 clkRate = Chip_Clock_GetMainOscRate();
Pokitto 30:796f9611d2ac 73 break;
Pokitto 30:796f9611d2ac 74
Pokitto 30:796f9611d2ac 75 case SYSCTL_PLLCLKSRC_RTC32K:
Pokitto 30:796f9611d2ac 76 clkRate = Chip_Clock_GetRTCOscRate();
Pokitto 30:796f9611d2ac 77 break;
Pokitto 30:796f9611d2ac 78
Pokitto 30:796f9611d2ac 79 default:
Pokitto 30:796f9611d2ac 80 clkRate = 0;
Pokitto 30:796f9611d2ac 81 }
Pokitto 30:796f9611d2ac 82
Pokitto 30:796f9611d2ac 83 return clkRate;
Pokitto 30:796f9611d2ac 84 }
Pokitto 30:796f9611d2ac 85
Pokitto 30:796f9611d2ac 86
Pokitto 30:796f9611d2ac 87 /* Return main clock rate */
Pokitto 30:796f9611d2ac 88 uint32_t Chip_Clock_GetMainClockRate(void)
Pokitto 30:796f9611d2ac 89 {
Pokitto 30:796f9611d2ac 90 uint32_t clkRate = 0;
Pokitto 30:796f9611d2ac 91
Pokitto 30:796f9611d2ac 92 switch ((CHIP_SYSCTL_MAINCLKSRC_T) (LPC_SYSCTL->MAINCLKSEL & 0x3)) {
Pokitto 30:796f9611d2ac 93 case SYSCTL_MAINCLKSRC_IRC:
Pokitto 30:796f9611d2ac 94 clkRate = Chip_Clock_GetIntOscRate();
Pokitto 30:796f9611d2ac 95 break;
Pokitto 30:796f9611d2ac 96
Pokitto 30:796f9611d2ac 97 case SYSCTL_MAINCLKSRC_PLLIN:
Pokitto 30:796f9611d2ac 98 clkRate = Chip_Clock_GetSystemPLLInClockRate();
Pokitto 30:796f9611d2ac 99 break;
Pokitto 30:796f9611d2ac 100
Pokitto 30:796f9611d2ac 101 case SYSCTL_MAINCLKSRC_WDTOSC:
Pokitto 30:796f9611d2ac 102 clkRate = Chip_Clock_GetWDTOSCRate();
Pokitto 30:796f9611d2ac 103 break;
Pokitto 30:796f9611d2ac 104
Pokitto 30:796f9611d2ac 105 case SYSCTL_MAINCLKSRC_PLLOUT:
Pokitto 30:796f9611d2ac 106 clkRate = Chip_Clock_GetSystemPLLOutClockRate();
Pokitto 30:796f9611d2ac 107 break;
Pokitto 30:796f9611d2ac 108 }
Pokitto 30:796f9611d2ac 109
Pokitto 30:796f9611d2ac 110 return clkRate;
Pokitto 30:796f9611d2ac 111 }
Pokitto 30:796f9611d2ac 112
Pokitto 30:796f9611d2ac 113 /* Return system clock rate */
Pokitto 30:796f9611d2ac 114 uint32_t Chip_Clock_GetSystemClockRate(void)
Pokitto 30:796f9611d2ac 115 {
Pokitto 30:796f9611d2ac 116 /* No point in checking for divide by 0 */
Pokitto 30:796f9611d2ac 117 return Chip_Clock_GetMainClockRate() / LPC_SYSCTL->SYSAHBCLKDIV;
Pokitto 30:796f9611d2ac 118 }
Pokitto 30:796f9611d2ac 119
Pokitto 30:796f9611d2ac 120