28 thoughts on “ The In-Circuit SD Card Switch ” swirlycurly says: June 8, 2014 at 7:06 pm Totally did this the exact same way. Same USB-SD converter too. Report comment. Reply ...

Thus, we’ve sent a 1 to the card and read in a bit. An access to chip select 1’s offset 0x20000 will set MOSI high while keeping nCS low. This is how a zero is sent to the card.