Improved clock tree configuration for SAMA5

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@10589 35acf78f-673a-0410-8e92-d51de3d6d3f4
2017-09-16 12:23:43 +00:00 · 2017-09-16 12:23:43 +00:00 · b3588b34c0
parent 43fb2b1779
commit b3588b34c0
1 changed files with 5 additions and 1 deletions
--- a/os/hal/ports/SAMA/SAMA5D2x/hal_lld.c
+++ b/os/hal/ports/SAMA/SAMA5D2x/hal_lld.c
@ -178,7 +178,11 @@ void sama_clock_init(void) {
    ;                                       /* Waits until MCK is stable.   */

  mckr &= ~(PMC_MCKR_PRES_Msk | PMC_MCKR_MDIV_Msk | PMC_MCKR_H32MXDIV);
-  mckr |= (SAMA_MCK_PRES | SAMA_MCK_MDIV | SAMA_H64MX_H32MX_DIV);
+  
+  /* Note that prescaler and divider must be changed with separate accesses.*/
+  mckr |= SAMA_MCK_PRES;
+  mckr |= SAMA_MCK_MDIV;
+  mckr |= SAMA_H64MX_H32MX_DIV;
 #if SAMA_PLLADIV2_EN
  mckr |= PMC_MCKR_PLLADIV2;
 #else