diff options
| author | Lorenz Meier <lm@inf.ethz.ch> | 2013-06-13 09:14:40 +0200 |
|---|---|---|
| committer | Lorenz Meier <lm@inf.ethz.ch> | 2013-06-13 09:14:40 +0200 |
| commit | c255df1df9c1cd51e6d0e71ee5f2e92a22eac5cf (patch) | |
| tree | 2254ceb7c66ba63b6cb6738af92c839f3868c748 /nuttx/arch/arm/src/sam34/sam_timerisr.c | |
| parent | bc5c15a4909386a1efd556f4648385440379b164 (diff) | |
| download | px4-nuttx-c255df1df9c1cd51e6d0e71ee5f2e92a22eac5cf.tar.gz px4-nuttx-c255df1df9c1cd51e6d0e71ee5f2e92a22eac5cf.tar.bz2 px4-nuttx-c255df1df9c1cd51e6d0e71ee5f2e92a22eac5cf.zip | |
Merged in upstream, took upstream UART driver without changes, needs re-evaluation (minor diffs to local version)
Diffstat (limited to 'nuttx/arch/arm/src/sam34/sam_timerisr.c')
| -rw-r--r-- | nuttx/arch/arm/src/sam34/sam_timerisr.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/nuttx/arch/arm/src/sam34/sam_timerisr.c b/nuttx/arch/arm/src/sam34/sam_timerisr.c index e1879d5cc..572b04626 100644 --- a/nuttx/arch/arm/src/sam34/sam_timerisr.c +++ b/nuttx/arch/arm/src/sam34/sam_timerisr.c @@ -55,6 +55,20 @@ /**************************************************************************** * Definitions ****************************************************************************/ +/* Select MCU-specific settings + * + * For the SAM3U, Systick is driven by the main clock. + * For the SAM4L, Systick is driven by the CPU clock which is just the main + * clock divided down. + */ + +#if defined(CONFIG_ARCH_CHIP_SAM3U) +# define SAM_SYSTICK_CLOCK BOARD_MCK_FREQUENCY /* Frequency of the main clock */ +#elif defined(CONFIG_ARCH_CHIP_SAM4L) || defined(CONFIG_ARCH_CHIP_SAM4S) +# define SAM_SYSTICK_CLOCK BOARD_CPU_FREQUENCY /* CPU frequency */ +#else +# error Unrecognized SAM architecture +#endif /* The desired timer interrupt frequency is provided by the definition * CLK_TCK (see include/time.h). CLK_TCK defines the desired number of @@ -69,9 +83,9 @@ #undef CONFIG_SAM34_SYSTICK_HCLKd8 /* Power up default is MCK, not MCK/8 */ #if CONFIG_SAM34_SYSTICK_HCLKd8 -# define SYSTICK_RELOAD ((SAM_MCK_FREQUENCY / 8 / CLK_TCK) - 1) +# define SYSTICK_RELOAD ((SAM_SYSTICK_CLOCK / 8 / CLK_TCK) - 1) #else -# define SYSTICK_RELOAD ((SAM_MCK_FREQUENCY / CLK_TCK) - 1) +# define SYSTICK_RELOAD ((SAM_SYSTICK_CLOCK / CLK_TCK) - 1) #endif /* The size of the reload field is 24 bits. Verify that the reload value |