diff options
Diffstat (limited to 'nuttx/configs/sama5d3x-ek/include/board_396mhz.h')
| -rw-r--r-- | nuttx/configs/sama5d3x-ek/include/board_396mhz.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/nuttx/configs/sama5d3x-ek/include/board_396mhz.h b/nuttx/configs/sama5d3x-ek/include/board_396mhz.h index 16dfb2e10..9d3f45759 100644 --- a/nuttx/configs/sama5d3x-ek/include/board_396mhz.h +++ b/nuttx/configs/sama5d3x-ek/include/board_396mhz.h @@ -99,12 +99,28 @@ #define BOARD_PMC_MCKR_PLLADIV PMC_MCKR_PLLADIV2 #define BOARD_PMC_MCKR_MDIV PMC_MCKR_MDIV_PCKDIV3 +/* ADC Configuration + * + * ADCClock = MCK / ((PRESCAL+1) * 2) + * + * Given: + * MCK = 132MHz + * ADCClock = 8MHz + * Then: + * PRESCAL = 7.25 + * + * PRESCAL=7 and MCK=132MHz yields ADC clock of 8.25MHz + */ + +#define BOARD_ADC_PRESCAL (7) + /* Resulting frequencies */ #define BOARD_MAINOSC_FREQUENCY (12000000) /* MAINOSC: 12MHz crystal on-board */ #define BOARD_PLLA_FREQUENCY (792000000) /* PLLACK: 66 * 12Mhz / 1 */ #define BOARD_PCK_FREQUENCY (396000000) /* CPU: PLLACK / 2 / 1 */ #define BOARD_MCK_FREQUENCY (132000000) /* MCK: PLLACK / 2 / 1 / 3 */ +#define BOARD_ADCCLK_FREQUENCY (8250000) /* ADCCLK: MCK / ((7+1)*2) */ #if defined(CONFIG_SAMA5_EHCI) || defined(CONFIG_SAMA5_OHCI) || \ defined(CONFIG_SAMA5_UDPHS) |