diff options
Diffstat (limited to 'nuttx/configs/lpc4330-xplorer/include/board.h')
| -rw-r--r-- | nuttx/configs/lpc4330-xplorer/include/board.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/nuttx/configs/lpc4330-xplorer/include/board.h b/nuttx/configs/lpc4330-xplorer/include/board.h index 6901b8d16..052c1a97f 100644 --- a/nuttx/configs/lpc4330-xplorer/include/board.h +++ b/nuttx/configs/lpc4330-xplorer/include/board.h @@ -151,6 +151,36 @@ #define LPC43_CCLK BOARD_FCLKOUT_FREQUENCY +/* SPIFI clocking **********************************************************/ +/* The SPIFI will receive clocking from a divider per the settings provided + * in this file. The NuttX code will configure PLL1 as the input clock + * for the selected divider + */ + +#if BOARD_FCLKOUT_FREQUENCY < 120000000 +# define BOARD_SPIFI_PLL1 1 /* Use PLL1 directly */ +# undef BOARD_SPIFI_DIVA +#else +# undef BOARD_SPIFI_PLL1 +# define BOARD_SPIFI_DIVA 1 /* Use IDIVA */ +#endif + +#undef BOARD_SPIFI_DIVB +#undef BOARD_SPIFI_DIVC +#undef BOARD_SPIFI_DIVD +#undef BOARD_SPIFI_DIVE + +/* We need to configure the divider so that its output is as close to 120MHz + * without exceeding that value. + */ + +#if BOARD_FCLKOUT_FREQUENCY < 120000000 +# define BOARD_SPIFI_FREQUENCY BOARD_FCLKOUT_FREQUENCY /* 72Mhz? */ +#else +# define BOARD_SPIFI_DIVIDER (2) /* 204MHz / 2 = 102MHz */ +# define BOARD_SPIFI_FREQUENCY (102000000) /* 204MHz / 2 = 102MHz */ +#endif + /* UART clocking ***********************************************************/ /* Configure all U[S]ARTs to use the XTAL input frequency */ |