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//***************************************************************************** // // Macro to call SysCtl_delay() to achieve a delay in microseconds. The macro // will convert the desired delay in microseconds to the count value expected // by the function. \b x is the number of microseconds to delay. // The SysCtl_delay() function takes around 3 cycles per iteration plus 9 // cycles of overhead which needs to be accounted for when converting the // microseconds delay into the number of delay loop iterations passed to the // SysCtl_delay() function. // // Note that 3 cycles per iteration is valid if SysCtl_delay function resides // in CxRAM. SxRAM is 2x slower than CxRAM and hence will consume 6 cycles per // iteration. // //***************************************************************************** #define DEVICE_DELAY_US(x) SysCtl_delay(((((long double)(x)) / (1000000.0L / \ (long double)CM_CLK_FREQ)) - 9.0L) / 3.0L)
