diff options
| author | Kévin Redon <kredon@sysmocom.de> | 2018-08-28 19:13:06 +0200 |
|---|---|---|
| committer | Kévin Redon <kredon@sysmocom.de> | 2018-08-28 19:13:13 +0200 |
| commit | e2b0f971e52f0e6baf74bd28b567e9d72286ad78 (patch) | |
| tree | c5fa03694df63e114de4bd58fd5ada49d6e8f4a5 /firmware/libboard/owhw/include/board.h | |
| parent | e07640c35a956183fdb1c39fd337f3ba71b2937f (diff) | |
set main clock for using UART at 921600 bps
UART baud rate is main clock (MCK) divided by CR*16.
The MCK values are chosen >= 48 MHz and <= 64 MHz to have a near
integer value CR for a baud rate of 921600 bps.
The end MCK frequency between simtrace and qmod differ slightly
but are close to 58 MHz.
Change-Id: Iaa4a97fc68494c93b9d128503515d88049de506c
Diffstat (limited to 'firmware/libboard/owhw/include/board.h')
| -rw-r--r-- | firmware/libboard/owhw/include/board.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/firmware/libboard/owhw/include/board.h b/firmware/libboard/owhw/include/board.h index be6bb17..401fb73 100644 --- a/firmware/libboard/owhw/include/board.h +++ b/firmware/libboard/owhw/include/board.h @@ -25,7 +25,10 @@ /** Board definition */ #define owhw +/** oscillator used as main clock source (in Hz) */ #define BOARD_MAINOSC 18432000 +/** desired main clock frequency (in Hz, based on BOARD_MAINOSC) */ +#define BOARD_MCK 58982400 // 18.432 * 16 / 5 /* USIM 2 interface (USART) */ #define PIN_USIM2_CLK {PIO_PA2, PIOA, ID_PIOA, PIO_PERIPH_B, PIO_DEFAULT} |