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
diff --git a/firmware/libboard/qmod/include/board.h b/firmware/libboard/qmod/include/board.h
index c23ad50..a738daa 100644
--- a/firmware/libboard/qmod/include/board.h
+++ b/firmware/libboard/qmod/include/board.h
@@ -28,7 +28,10 @@
/** Board definition */
#define qmod
+/** oscillator used as main clock source (in Hz) */
#define BOARD_MAINOSC 12000000
+/** desired main clock frequency (in Hz, based on BOARD_MAINOSC) */
+#define BOARD_MCK 58000000 // 18.432 * 29 / 6
/* USIM 2 interface (USART) */
#define PIN_USIM2_CLK {PIO_PA2, PIOA, ID_PIOA, PIO_PERIPH_B, PIO_DEFAULT}