diff options
Diffstat (limited to 'nuttx/configs/dk-tm4c129x/include/board.h')
| -rw-r--r-- | nuttx/configs/dk-tm4c129x/include/board.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/nuttx/configs/dk-tm4c129x/include/board.h b/nuttx/configs/dk-tm4c129x/include/board.h index 5efb3cc9a..2e9c4549a 100644 --- a/nuttx/configs/dk-tm4c129x/include/board.h +++ b/nuttx/configs/dk-tm4c129x/include/board.h @@ -60,6 +60,12 @@ #define SYSCON_RCC_XTAL SYSCON_RCC_XTAL16000KHZ /* On-board crystal is 25 MHz */ #define XTAL_FREQUENCY 25000000 +/* Frequencies of other clock sources */ + +#define PIOSC_FREQUENCY 16000000 /* Precision internal oscillator */ +#define RTCOSC_FREQUENCY 32768 /* Hibernation Module RTC Oscillator */ +#define LFIOSC_FREQUENCY 33000 /* Low frequency internal oscillator */ + /* The PLL generates Fvco according to the following formulae. The input clock to * the PLL may be either the external crystal (Fxtal) or PIOSC (Fpiosc). This * logic supports only the external crystal as the PLL source clock. @@ -94,6 +100,18 @@ #define BOARD_PLL_SYSDIV 4 /* Sysclk = Fvco / 4 = 120MHz */ #define SYSCLK_FREQUENCY 120000000 /* Resulting SysClk frequency */ +/* Alternate Clock (ALTCLK) + * + * The ALTCLK provides a clock source of numerous frequencies to the general-purpose + * timer, SSI, and UART modules. The default source for the ALTCLK is the Precision + * Internal Oscillator (PIOSC). The Hibernation Real-time Clock (RTCOSC) and Low + * Frequency Internal Oscillator (LFIOSC) are alternatives. If the RTCOSC Output is + * selected, the clock source must also be enabled in the Hibernation module. + */ + +#define BOARD_ALTCLKCFG SYSCON_ALTCLKCFG_ALTCLK_PIOSC +#define ALTCLK_FREQUENCY PIOSC_FREQUENCY + /* LED definitions ******************************************************************/ /* The DK-TM4C129X has a single RGB LED. There is only one visible LED which * will vary in color. But, from the standpoint of the firmware, this appears as |