Embedded/tinyusb
1
0
Fork 0
mirror of https://github.com/hathach/tinyusb.git synced 2025-02-07 05:54:11 +08:00
Code Issues Packages Projects Releases Wiki Activity

LPC55 : Use PLL clock for better precision, allows easier UAC testing.

Browse Source
This commit is contained in:
HiFiPhile 2023-11-19 23:45:02 +01:00
parent 0a70a66b07
commit a7762ff82e
1 changed files with 52 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

75
hw/bsp/lpc55/family.c
View File

@ -81,44 +81,73 @@ void USB1_IRQHandler(void) {
}
/****************************************************************
name: BOARD_BootClockFROHF96M
name: BOARD_BootClockPLL100M
outputs:
- {id: SYSTICK_clock.outFreq, value: 96 MHz}
- {id: System_clock.outFreq, value: 96 MHz}
- {id: System_clock.outFreq, value: 100 MHz}
settings:
- {id: SYSCON.MAINCLKSELA.sel, value: SYSCON.fro_hf}
- {id: PLL0_Mode, value: Normal}
- {id: ANALOG_CONTROL_FRO192M_CTRL_ENDI_FRO_96M_CFG, value: Enable}
- {id: ENABLE_CLKIN_ENA, value: Enabled}
- {id: ENABLE_SYSTEM_CLK_OUT, value: Enabled}
- {id: SYSCON.MAINCLKSELB.sel, value: SYSCON.PLL0_BYPASS}
- {id: SYSCON.PLL0CLKSEL.sel, value: SYSCON.CLK_IN_EN}
- {id: SYSCON.PLL0M_MULT.scale, value: '100', locked: true}
- {id: SYSCON.PLL0N_DIV.scale, value: '4', locked: true}
- {id: SYSCON.PLL0_PDEC.scale, value: '4', locked: true}
sources:
- {id: SYSCON.fro_hf.outFreq, value: 96 MHz}
- {id: ANACTRL.fro_hf.outFreq, value: 96 MHz}
- {id: SYSCON.XTAL32M.outFreq, value: 16 MHz, enabled: true}
******************************************************************/
void BootClockFROHF96M(void) {
/*!< Set up the clock sources */
/*!< Set up FRO */
POWER_DisablePD(kPDRUNCFG_PD_FRO192M); /*!< Ensure FRO is on */
CLOCK_SetupFROClocking(12000000U); /*!< Set up FRO to the 12 MHz, just for sure */
CLOCK_AttachClk(kFRO12M_to_MAIN_CLK); /*!< Switch to FRO 12MHz first to ensure we can change voltage without
accidentally being below the voltage for current speed */
void BOARD_BootClockPLL100M(void)
{
/*!< Set up the clock sources */
/*!< Configure FRO192M */
POWER_DisablePD(kPDRUNCFG_PD_FRO192M); /*!< Ensure FRO is on */
CLOCK_SetupFROClocking(12000000U); /*!< Set up FRO to the 12 MHz, just for sure */
CLOCK_AttachClk(kFRO12M_to_MAIN_CLK); /*!< Switch to FRO 12MHz first to ensure we can change the clock setting */
CLOCK_SetupFROClocking(96000000U); /*!< Set up high frequency FRO output to selected frequency */
CLOCK_SetupFROClocking(96000000U); /* Enable FRO HF(96MHz) output */
POWER_SetVoltageForFreq(96000000U); /*!< Set voltage for the one of the fastest clock outputs: System clock output */
CLOCK_SetFLASHAccessCyclesForFreq(96000000U); /*!< Set FLASH wait states for core */
/*!< Configure XTAL32M */
POWER_DisablePD(kPDRUNCFG_PD_XTAL32M); /* Ensure XTAL32M is powered */
POWER_DisablePD(kPDRUNCFG_PD_LDOXO32M); /* Ensure XTAL32M is powered */
CLOCK_SetupExtClocking(16000000U); /* Enable clk_in clock */
SYSCON->CLOCK_CTRL |= SYSCON_CLOCK_CTRL_CLKIN_ENA_MASK; /* Enable clk_in from XTAL32M clock */
ANACTRL->XO32M_CTRL |= ANACTRL_XO32M_CTRL_ENABLE_SYSTEM_CLK_OUT_MASK; /* Enable clk_in to system */
/*!< Set up dividers */
CLOCK_SetClkDiv(kCLOCK_DivAhbClk, 1U, false); /*!< Set AHBCLKDIV divider to value 1 */
POWER_SetVoltageForFreq(100000000U); /*!< Set voltage for the one of the fastest clock outputs: System clock output */
CLOCK_SetFLASHAccessCyclesForFreq(100000000U); /*!< Set FLASH wait states for core */
/*!< Set up clock selectors - Attach clocks to the peripheries */
CLOCK_AttachClk(kFRO_HF_to_MAIN_CLK); /*!< Switch MAIN_CLK to FRO_HF */
/*!< Set up PLL */
CLOCK_AttachClk(kEXT_CLK_to_PLL0); /*!< Switch PLL0CLKSEL to EXT_CLK */
POWER_DisablePD(kPDRUNCFG_PD_PLL0); /* Ensure PLL is on */
POWER_DisablePD(kPDRUNCFG_PD_PLL0_SSCG);
const pll_setup_t pll0Setup = {
.pllctrl = SYSCON_PLL0CTRL_CLKEN_MASK | SYSCON_PLL0CTRL_SELI(53U) | SYSCON_PLL0CTRL_SELP(26U),
.pllndec = SYSCON_PLL0NDEC_NDIV(4U),
.pllpdec = SYSCON_PLL0PDEC_PDIV(2U),
.pllsscg = {0x0U,(SYSCON_PLL0SSCG1_MDIV_EXT(100U) | SYSCON_PLL0SSCG1_SEL_EXT_MASK)},
.pllRate = 100000000U,
.flags = PLL_SETUPFLAG_WAITLOCK
};
CLOCK_SetPLL0Freq(&pll0Setup); /*!< Configure PLL0 to the desired values */
/*!< Set SystemCoreClock variable. */
SystemCoreClock = 96000000U;
/*!< Set up dividers */
CLOCK_SetClkDiv(kCLOCK_DivAhbClk, 1U, false); /*!< Set AHBCLKDIV divider to value 1 */
/*!< Set up clock selectors - Attach clocks to the peripheries */
CLOCK_AttachClk(kPLL0_to_MAIN_CLK); /*!< Switch MAIN_CLK to PLL0 */
/*< Set SystemCoreClock variable. */
SystemCoreClock = 100000000U;
}
void board_init(void) {
// Enable IOCON clock
CLOCK_EnableClock(kCLOCK_Iocon);
// Init 96 MHz clock
BootClockFROHF96M();
// Init 100 MHz clock
BOARD_BootClockPLL100M();
// 1ms tick timer
SysTick_Config(SystemCoreClock / 1000);