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board_lowlevel: More comments about clock initialization

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This commit is contained in:
Harald Welte
2016-02-29 19:45:59 +01:00
parent ebbb645f4b
commit 4678388c3c
1 changed files with 9 additions and 1 deletions
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10
firmware/src_board/board_lowlevel.c
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@@ -103,20 +103,28 @@ extern WEAK void LowLevelInit( void )
/* Switch to 3-20MHz Xtal oscillator */ /* Switch to 3-20MHz Xtal oscillator */
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCSEL; PMC->CKGR_MOR = CKGR_MOR_KEY(0x37) | BOARD_OSCOUNT | CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCSEL;
/* wait for Main XTAL oscillator stabilization */
timeout = 0; timeout = 0;
while (!(PMC->PMC_SR & PMC_SR_MOSCSELS) && (timeout++ < CLOCK_TIMEOUT)); while (!(PMC->PMC_SR & PMC_SR_MOSCSELS) && (timeout++ < CLOCK_TIMEOUT));
/* "switch" to main clock as master clock source (should already be the case */
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~(uint32_t)PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK; PMC->PMC_MCKR = (PMC->PMC_MCKR & ~(uint32_t)PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
/* wait for master clock to be ready */
for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; ); for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; );
/* Initialize PLLA */ /* Initialize PLLA */
PMC->CKGR_PLLAR = BOARD_PLLAR; PMC->CKGR_PLLAR = BOARD_PLLAR;
/* Wait for PLLA to lock */
timeout = 0; timeout = 0;
while (!(PMC->PMC_SR & PMC_SR_LOCKA) && (timeout++ < CLOCK_TIMEOUT)); while (!(PMC->PMC_SR & PMC_SR_LOCKA) && (timeout++ < CLOCK_TIMEOUT));
/* Switch to main clock */ /* Switch to main clock (again ?!?) */
PMC->PMC_MCKR = (BOARD_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK; PMC->PMC_MCKR = (BOARD_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
/* wait for master clock to be ready */
for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; ); for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; );
/* switch to PLLA as master clock source */
PMC->PMC_MCKR = BOARD_MCKR ; PMC->PMC_MCKR = BOARD_MCKR ;
/* wait for master clock to be ready */
for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; ); for ( timeout = 0; !(PMC->PMC_SR & PMC_SR_MCKRDY) && (timeout++ < CLOCK_TIMEOUT) ; );
} }