Function cmd6_sd_access_mode 

pub fn cmd6_sd_access_mode(switch: bool, function: u8) -> Command

CMD6 helper: select SD access mode function in group 1.

Function numbers follow the SD Physical Layer access-mode group: 0 = default/SDR12, 1 = high-speed/SDR25, 2 = SDR50, 3 = SDR104, 4 = DDR50. Groups 6..2 are set to “no change”.