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XMC4xxx: Misc clock clean-up; PBDIV should be controllable from board.h

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This commit is contained in:
Gregory Nutt 2017-03-21 15:05:17 -06:00
parent 6893843cc5
commit 343f7ceab2
3 changed files with 22 additions and 12 deletions
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9
arch/arm/src/xmc4/xmc4_clockconfig.c
View File

@ -105,13 +105,18 @@
#define CLKSET_VALUE (0x00000000)
#define SYSCLKCR_VALUE (0x00010001)
#define CPUCLKCR_VALUE (0x00000000)
#define PBCLKCR_VALUE (0x00000000)
#define CCUCLKCR_VALUE (0x00000000)
#define WDTCLKCR_VALUE (0x00000000)
#define EBUCLKCR_VALUE (0x00000003)
#define USBCLKCR_VALUE (0x00010000)
#define EXTCLKCR_VALUE (0x01200003)
#if BOARD_PBDIV == 1
# define PBCLKCR_VALUE SCU_PBCLKCR_PBDIV_FCPU
#else /* BOARD_PBDIV == 2 */
# define PBCLKCR_VALUE SCU_PBCLKCR_PBDIV_DIV2
#endif
#if ((USBCLKCR_VALUE & SCU_USBCLKCR_USBSEL) == SCU_USBCLKCR_USBSEL_USBPLL)
# define USB_DIV 3
#else
@ -387,7 +392,7 @@ void xmc4_clock_configure(void)
/* Before scaling to final frequency we need to setup the clock dividers */
putreg32(SYSCLKCR_VALUE, XMC4_SCU_SYSCLKCR);
putreg32(PBCLKCR_VALUE, XMC4_SCU_PBCLKCR);
putreg32(PBCLKCR_VALUE, XMC4_SCU_PBCLKCR);
putreg32(CPUCLKCR_VALUE, XMC4_SCU_CPUCLKCR);
putreg32(CCUCLKCR_VALUE, XMC4_SCU_CCUCLKCR);
putreg32(WDTCLKCR_VALUE, XMC4_SCU_WDTCLKCR);

4
arch/arm/src/xmc4/xmc4_usic.c
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@ -448,14 +448,14 @@ int xmc4_usic_baudrate(enum usic_channel_e channel, uint32_t baud,
/* Select and setup the fractional divider */
regval = USIC_FDR_DM_FRACTIONAL | (clkdiv_min << USIC_FDR_STEP_SHIFT);
regval = USIC_FDR_DM_FRACTIONAL | USIC_FDR_STEP(clkdiv_min);
putreg32(regval, base + XMC4_USIC_FDR_OFFSET);
/* Setup and enable the baud rate generator */
regval = getreg32(base + XMC4_USIC_BRG_OFFSET);
regval &= ~(USIC_BRG_DCTQ_MASK | USIC_BRG_PDIV_MASK | USIC_BRG_PCTQ_MASK | USIC_BRG_PPPEN);
regval |= (USIC_BRG_DCTQ(oversampling - 1) | USIC_BRG_PDIV(pdiv_int_min - 1));
regval |= (USIC_BRG_DCTQ(oversampling - 1) | USIC_BRG_PDIV(pdiv_int_min - 1));
putreg32(regval, base + XMC4_USIC_BRG_OFFSET);
ret = OK;

21
configs/xmc4500-relax/include/board.h
View File

@ -53,10 +53,10 @@
/* Clocking *************************************************************************/
/* Default clock initialization
* fPLL = 288MHz => fSYS = 288MHz => fCPU = 144MHz
* => fPB = 144MHz
* => fCCU = 144MHz
* => fETH = 72MHz
* fPLL = 288MHz => fSYS = 288MHz => fCPU = 144MHz
* => fPERIPH = 144MHz
* => fCCU = 144MHz
* => fETH = 72MHz
* => fUSB = 48MHz
* => fEBU = 72MHz
*
@ -79,7 +79,7 @@
/* Select the external crystal as the PLL clock source */
#define BOARD_PLL_CLOCKSRC_XTAL 1 /* PLL Clock source == extnernal crystal */
#undef BOARD_PLL_CLOCKSRC_OFI /* PLL Clock source != internal fast oscillator */
#undef BOARD_PLL_CLOCKSRC_OFI /* PLL Clock source != internal fast oscillator */
/* PLL Configuration:
*
@ -95,16 +95,21 @@
#define BOARD_PLL_K2DIV 1
#define BOARD_PLL_FREQUENCY 288000000
/* System frequency is divided down from PLL output */
/* System frequency, fSYS, is divided down from PLL output */
#define BOARD_SYSDIV 1 /* PLL Output divider to get fSYS */
#define BOARD_SYS_FREQUENCY 288000000
/* CPU frequency may be divided down from system frequency */
/* CPU frequency, fCPU, may be divided down from system frequency */
#define BOARD_CPUDIV_ENABLE 1 /* Enable PLL dive by 2 for fCPU */
#define BOARD_CPU_FREQUENCY 144000000
/* The peripheral clock, fPERIPH, derives from fCPU with no division */
#define BOARD_PBDIV 1 /* No division */
#define BOARD_PERIPH_FREQUENCY 144000000
/* Standby clock source selection
*
* BOARD_STDBY_CLOCKSRC_OSI - Internal 32.768KHz slow oscillator
@ -112,7 +117,7 @@
*/
#define BOARD_STDBY_CLOCKSRC_OSI 1
#undef BOARD_STDBY_CLOCKSRC_OSCULP
#undef BOARD_STDBY_CLOCKSRC_OSCULP
#define BOARD_STDBY_FREQUENCY 32768
/* USB PLL settings.