Zach Welch <zw@superlucidity.net> add TAP_SCAN_BYTES macro (1 of 2)

[openocd.git] / src / jtag / jtag.h

diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h
index 2a7d85615e863bc9dbb3bf9e221e0994a061dc5d..a14edb481bd331bba8eaa832a8925704ba716bfb 100644 (file)
--- a/src/jtag/jtag.h
+++ b/src/jtag/jtag.h
@@ -217,6 +217,9 @@ typedef void* error_handler_t;  /* Later on we can delete error_handler_t, but k
 struct scan_field_s;
 typedef int (*in_handler_t)(u8* in_value, void* priv, struct scan_field_s* field);
 
+/// @brief calculates number of bytes required to hold @a n TAP scan bits
+#define TAP_SCAN_BYTES(n)              (((n) / 8) + !!((n) % 8))
+
 typedef struct scan_field_s
 {
        jtag_tap_t* tap;                /* tap pointer this instruction refers to */