allow override of XOSC_MHZ (#644)
* And increased assertion limit to 50 as 15 was the limit for the oscillator but not for XIN
diff --git a/src/rp2040/hardware_regs/include/hardware/platform_defs.h b/src/rp2040/hardware_regs/include/hardware/platform_defs.h
index f3193da..08c7159 100644
--- a/src/rp2040/hardware_regs/include/hardware/platform_defs.h
+++ b/src/rp2040/hardware_regs/include/hardware/platform_defs.h
@@ -36,7 +36,10 @@
#define PIO_INSTRUCTION_COUNT _u(32)
+// PICO_CONFIG: XOSC_MHZ, The crystal oscillator frequency in Mhz, type=int, default=12, advanced=true, group=hardware_base
+#ifndef XOSC_MHZ
#define XOSC_MHZ _u(12)
+#endif
#endif
diff --git a/src/rp2_common/hardware_xosc/xosc.c b/src/rp2_common/hardware_xosc/xosc.c
index 9a95e37..7a7055c 100644
--- a/src/rp2_common/hardware_xosc/xosc.c
+++ b/src/rp2_common/hardware_xosc/xosc.c
@@ -13,8 +13,8 @@
#include "hardware/regs/xosc.h"
#include "hardware/xosc.h"
-#if XOSC_MHZ < 1 || XOSC_MHZ > 15
-#error XOSC_MHZ must be in the range 1-15
+#if XOSC_MHZ < 1 || XOSC_MHZ > 50
+#error XOSC_MHZ must be in the range 1-50
#endif
#define STARTUP_DELAY (((((XOSC_MHZ * MHZ) / 1000) + 128) / 256) * PICO_XOSC_STARTUP_DELAY_MULTIPLIER)
