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Fix middlewware spec #331

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merged 2 commits into from
Oct 11, 2023
Merged

Fix middlewware spec #331

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f2bd5af
fix(MiddlewareSpec): transmit high byte first instead of low
Oct 10, 2023
1860657
fix(MiddlewareSpec): correct counter in example code
Oct 10, 2023
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4 changes: 2 additions & 2 deletions elasticai/creator/vhdl/system_integrations/README.md
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Expand Up @@ -68,7 +68,7 @@ MWMCU --> MWFPGA
## Middleware Memory Mapped IO via SPI

We transmit data via SPI in the following format to interact with the FPGA. The FPGA :
- First two byte determines the message type, transmitted low byte first.
- First two byte determines the message type, transmitted high byte first.
- the rest of the transferred data is the payload
- c code example of read/write:
- `uint16_t write_command = command | 0x8000;`
Expand All @@ -84,7 +84,7 @@ We transmit data via SPI in the following format to interact with the FPGA. The
- LED: 0x03 (1 byte)
- each of the lowest four bits control one of the LEDs
- 0=off, 1=on
- eg., command to turn on first led: `char command[] = {0x80, 0x03, 0x01}; for (i=0; i < 2; i++) {send_byte(command[i]);}`
- eg., command to turn on first led: `char command[] = {0x80, 0x03, 0x01}; for (i=0; i < 3; i++) {send_byte(command[i]);}`
- USERLOGIC_CONTROL: 0x04 (1 byte)
- sets the reset pin of the skeleton
- Multiboot: 0x05-0x07 (3 bytes)
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