On Tue, May 19, 2020 at 12:17:27AM +0300, Serge Semin wrote: > Here is what we need to do to perform the EEPROM-read operation: > 1) Enable EEPROM-read mode. > 2) Initialize a corresponding registers with a number of SPI transfer words > (with bits-per-word taken into account) to read. > 3) Push opcode + address + dummy bytes into the Tx FIFO. When it's done and > the Tx FIFO is empty, the controller will proceed with read operations by > pushing zeros (or ones, don't remember what level it's by default) to MOSI > and pulling data from MISO into the RX FIFO. > 4) Keep up with getting data from the Rx FIFO so one wouldn't get overflown. > Regarding programming write each time. Well, it's up to the driver implementation. > If opcode, address, dummy bytes and number of words to read are the same as before, > then re-programming isn't required. Ah, nice. This should be useful for far more than just flash - most register reads will also be able to take advantage of this, they follow a similar write then read pattern.
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