6.1.2.3 DIAG_SRAM_MARCH_ALT_CLK_FRQ

#define DIAG_SRAM_MARCH_ALT_CLK_FRQ

Decides the main clock frequency used when calling DIAG_SRAM_MarchStartup() if DIAG_SRAM_MARCH_ALT_CLK_FRQ_ENABLED is not zero. The main clock frequency will be set back to default upon completing the start-up test. If DIAG_SRAM_MARCH_ALT_CLK_FRQ_ENABLED is set to zero, this macro has no effect and the default main clock frequency will be used during the start-up test. Using a higher main clock frequency than the default value will reduce the Worst-Case Execution Time (WCET) of DIAG_SRAM_MarchStartup().

Depending on the device, set the frequency by defining the macro value as any CLKCTRL_FRQSEL_t group configuration (e.g., CLKCTRL_FRQSEL_24M_gc) or CLKCTRL_PDIV_t group configuration (e.g., CLKCTRL_PDIV_2X_gc). The former option, if available for the device in use (such as the AVR DA family of devices), can set the frequency directly regardless of the supply voltage to the device. The latter option divides the main clock source frequency (which can depend on FUSE settings), if the PEN bit is also set, with the specified value. Thus, when configuring with the latter option, ensure that CLKCTRL_PEN_bm is bitwise ORed with the CLKCTRL_PDIV_t group configuration, e.g: #define DIAG_SRAM_MARCH_CLK_FRQ (CLKCTRL_PDIV_2X_gc | CLKCTRL_PEN_bm)