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SPI host doc updated with chip select #353

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Nov 18, 2024
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SPI host doc updated with chip select #353

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21 changes: 12 additions & 9 deletions doc/ip/spi.md
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Expand Up @@ -12,15 +12,18 @@ In Sonata, there are multiple uses for SPI:
- Arduino shield
- mikroBUS click

The offset for each of the blocks is shown below, with each additional block having a `0x1000` offset from the previous.

| SPI Instance | Offset (from SPI base) |
|-----------------------|------------------------|
| LCD Screen | 0x0000 |
| Ethernet MAC | 0x1000 |
| SPI0 | 0x2000 |
| SPI1 | 0x3000 |
| SPI2 | 0x4000 |
The offset for each of the blocks is shown below, with each additional block having a 0x1000 offset from the previous.
The offsets in the table below are from the SPI base address, which is 0x8030_0000.
The table also shows the connections of the chip select (CS) wires.
CS1 for LCD and Ethernet and CS2 for LCD are *not* used as chip selects but rather for block specific functions like reset and data/control signals.

| Name | Offset | Blocks | CS0 | CS1 | CS2 | CS3 |
|--------------|--------|---------------------------|--------------|--------------|--------------|----------|
| LCD Screen | 0x0000 | *Only* LCD | CS | Data/control | Reset | |
| Ethernet MAC | 0x1000 | *Only* Ethernet | CS | Reset | | |
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| SPI0 | 0x2000 | Flash or MicroSD | Flash | MicroSD | | |
| SPI1 | 0x3000 | HAT SPI0, Shield, Pmod0 | HAT or Pmod0 | HAT or Pmod0 | Pmod0 | Shield |
| SPI2 | 0x4000 | HAT SPI1, mikroBUS, Pmod1 | HAT or Pmod1 | HAT or Pmod1 | HAT or Pmod1 | mikroBUS |

Please refer to the [pin multiplexer](pinmux/pin-mappings.md) on how to connect SPI 0, 1 and 2.
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