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SAMA5D-EK: Correct system timer frequency. Input clock is MCK/2, not MCK

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This commit is contained in:
Gregory Nutt 2014-07-29 07:12:36 -06:00
parent 29ea8ab0e4
commit e053158f95
1 changed files with 8 additions and 3 deletions
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11
arch/arm/src/sama5/sam_timerisr.c
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@ -52,11 +52,16 @@
#include "chip/sam_pit.h"
/****************************************************************************
* Definitions
* Pre-processor Definitions
****************************************************************************/
/* The PIT counter runs at a rate of the main clock (MCK) divided by 16 */
/* The PIT counter runs at a rate of the main clock (MCK) divided by 16.
*
* On the SAMA5D4, the clocking to the PIC may be divided down from MCK.
* Perhaps because of H32MXDIV? We will let the board.h tell us the correct
* PIT include clock by defining BOARD_PIT_FREQUENCY.
*/
#define PIT_CLOCK (BOARD_MCK_FREQUENCY >> 4)
#define PIT_CLOCK (BOARD_PIT_FREQUENCY >> 4)
/* The desired timer interrupt frequency is provided by the definition
* CLK_TCK (see include/time.h). CLK_TCK defines the desired number of