diff --git a/fsw_params.h b/fsw_params.h
--- a/fsw_params.h
+++ b/fsw_params.h
@@ -120,6 +120,7 @@ typedef struct ring_node
 #define REGS_ADDR_APBUART           0x80000100
 #define REGS_ADDR_GPTIMER           0x80000300
 #define REGS_ADDR_GRSPW             0x80000500
+#define APB_OFFSET_GRSPW_TIME_REGISTER 0x14
 #define REGS_ADDR_TIME_MANAGEMENT   0x80000600
 #define REGS_ADDR_GRGPIO            0x80000b00