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[SC64][DOCS] Documented USB interface asynchronous packets
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Mateusz Faderewski
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@ -44,6 +44,20 @@
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- [`arg1` (length)](#arg1-length-2)
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- [`data` (data)](#data-data-1)
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- [Asynchronous packets](#asynchronous-packets)
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- [`B`: **BUTTON**](#b-button)
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- [`U`: **DATA**](#u-data)
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- [`data` (data)](#data-data-2)
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- [`G`: **DATA\_FLUSHED**](#g-data_flushed)
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- [`D`: **DISK\_REQUEST**](#d-disk_request)
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- [`data` (disk\_info/block\_data)](#data-disk_infoblock_data)
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- [Fields details](#fields-details)
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- [`I`: **IS\_VIEWER\_64**](#i-is_viewer_64)
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- [`data` (text)](#data-text)
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- [`S`: **SAVE\_WRITEBACK**](#s-save_writeback)
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- [`data` (save\_contents)](#data-save_contents)
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- [`F`: **UPDATE\_STATUS**](#f-update_status)
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- [`data` (progress)](#data-progress)
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- [Fields details](#fields-details-1)
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---
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@ -109,7 +123,7 @@ General structure of packet:
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| ------ | -------------------- | ---------------------- |
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| `0` | char[3] | `RSP`/`ERR` identifier |
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| `3` | char[1] | Command ID |
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| `4` | uint32_t | Data length |
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| `4` | uint32_t | Response data length |
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| `8` | uint8_t[data_length] | Response data (if any) |
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`RSP`/`ERR` packet is sent as a response to the command sent by the PC.
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@ -122,7 +136,7 @@ General structure of packet:
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| ------ | -------------------- | -------------------- |
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| `0` | char[3] | `PKT` identifier |
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| `3` | char[1] | Packet ID |
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| `4` | uint32_t | Data length |
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| `4` | uint32_t | Packet data length |
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| `8` | uint8_t[data_length] | Packet data (if any) |
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Available packet IDs are listed in the [asynchronous packets](#asynchronous-packets) section.
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@ -417,22 +431,147 @@ Writes bytes to the specified memory address. Please refer to the [internal memo
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| `0` | uint8_t[length] | Arbitrary data |
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_This command does not send response data._
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_This command does not send `RSP`/`ERR` packet response!_
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This command notifies N64 that data is waiting to be acknowledged.
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If N64 side doesn't acknowledge data via [`m` **USB_READ**](./02_n64_commands.md) N64 command within 1 second then data is flushed and [`G` **DATA_FLUSHED**](#asynchronous-packets) asynchronous packet is sent to the PC.
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If N64 side doesn't acknowledge data via [`m` **USB_READ**](./02_n64_commands.md#m-usb_read) N64 command within 1 second then data is flushed and [`G` **DATA_FLUSHED**](#asynchronous-packets) asynchronous packet is sent to the PC.
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If N64 acknowledge the request, then data is written to the flashcart memory to address specified in [`m` **USB_READ**](./02_n64_commands.md) N64 command.
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---
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## Asynchronous packets
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| id | name | data | description |
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| --- | ---------------------- | -------------------- | ------------------------------------------- |
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| `B` | [**BUTTON**]() | --- | Button on the back of the SC64 was pressed |
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| `G` | [**DATA_FLUSHED**]() | --- | Data from `USB_WRITE` command was discarded |
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| `U` | [**DEBUG_DATA**]() | debug_data | Data sent from the N64 |
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| `D` | [**DISK_REQUEST**]() | disk_info/block_data | 64DD disk block R/W request |
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| `I` | [**IS_VIEWER_64**]() | text | IS-Viewer 64 `printf` text |
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| `S` | [**SAVE_WRITEBACK**]() | save_contents | Flushed save data |
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| `F` | [**UPDATE_STATUS**]() | progress | Firmware update progress |
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| id | name | data | description |
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| --- | --------------------------------------- | -------------------- | --------------------------------------------------------------------- |
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| `B` | [**BUTTON**](#b-button) | --- | Button on the back of the SC64 was pressed |
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| `U` | [**DATA**](#u-data) | data | Data sent from the N64 |
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| `G` | [**DATA_FLUSHED**](#g-data_flushed) | --- | Data from [`U` **USB_WRITE**](#u-usb_write) USB command was discarded |
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| `D` | [**DISK_REQUEST**](#d-disk_request) | disk_info/block_data | 64DD disk block R/W request |
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| `I` | [**IS_VIEWER_64**](#i-is_viewer_64) | text | IS-Viewer 64 `printf` text |
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| `S` | [**SAVE_WRITEBACK**](#s-save_writeback) | save_contents | Flushed save data |
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| `F` | [**UPDATE_STATUS**](#f-update_status) | progress | Firmware update progress |
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---
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### `B`: **BUTTON**
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**Button on the back of the SC64 was pressed**
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This packet is sent only when [**BUTTON_MODE**](./04_config_options.md#13-button_mode) config option is set to value "`2` - Button press sends USB packet".
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_This packet does not send additional data._
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---
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### `U`: **DATA**
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**Data sent from the N64**
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This packet is sent when N64 command [**USB_WRITE**](./02_n64_commands.md#m-usb-write) is executed.
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#### `data` (data)
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| offset | type | description |
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| ------ | -------------------- | ----------- |
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| `0` | uint8_t | Datatype |
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| `1` | uint24_t | Data length |
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| `4` | uint8_t[data_length] | Packet data |
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---
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### `G`: **DATA_FLUSHED**
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**Data from [`U` **USB_WRITE**](#u-usb_write) USB command was discarded**
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This packet is sent only when data sent with USB command [`U` **USB_WRITE**](#u-usb_write) was not acknowledged by the N64 side with [`m` **USB_READ**](./02_n64_commands.md#m-usb_read) within 1 second time limit.
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_This packet does not send additional data._
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---
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### `D`: **DISK_REQUEST**
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**64DD disk block R/W request**
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This packet is sent when 64DD mode is set to pass R/W requests to the USB interface with [**DD_SD_ENABLE**](./04_config_options.md#9-dd_sd_enable) config option.
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Every disk request packet must be acknowledged by the PC side with [`D` **DD_SET_BLOCK_READY**](#d-dd_set_block_ready) USB command.
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#### `data` (disk_info/block_data)
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| offset | type | description |
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| ------ | --------------------------- | ---------------------------------------------------- |
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| `0` | uint32_t | Disk command |
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| `4` | uint32_t | Memory address |
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| `8` | uint32_t | Disk track/head/block |
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| `12` | uint8_t[packet_length - 12] | Data to be written to the 64DD disk block (optional) |
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#### Fields details
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**Disk command**:
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| value | description |
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| ----- | ------------------------------ |
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| `1` | Read data from 64DD disk block |
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| `2` | Write data to 64DD disk block |
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**Memory address**:
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Internal SC64 address where data is expected to be written for read command
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**Disk track/head/block**:
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| bits | description |
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| --------- | ----------- |
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| `[31:13]` | _Unused_ |
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| `[12:2]` | Track |
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| `[1]` | Head |
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| `[0]` | Block |
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---
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### `I`: **IS_VIEWER_64**
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**IS-Viewer 64 `printf` text**
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This packet is sent when IS-Viewer 64 module is enabled in the SC64 with [**ISV_ADDRESS**](./04_config_options.md#4-isv_address) config option, and data is written to the IS-Viewer 64 buffer.
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#### `data` (text)
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| offset | type | description |
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| ------ | ---------------------- | ----------- |
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| `0` | uint8_t[packet_length] | Text |
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---
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### `S`: **SAVE_WRITEBACK**
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**Flushed save data**
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This packet is sent when save writeback module is enabled and set to send data to the USB interface with [`W` **WRITEBACK_ENABLE**](#w-writeback_enable) USB command.
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Save data is flushed after 1 second delay from the last write to the save region by the app/game running on the N64.
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#### `data` (save_contents)
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| offset | type | description |
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| ------ | -------------------------- | ---------------------------------------------------------------------------------------- |
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| `0` | uint32_t | Save type (same as in [**SAVE_TYPE**](./04_config_options.md#6-save_type) config option) |
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| `4` | uint8_t[packet_length - 4] | Save data |
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---
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### `F`: **UPDATE_STATUS**
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**Firmware update progress**
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This packet is sent during firmware update process to indicate progress and errors.
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#### `data` (progress)
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| offset | type | description |
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| ------ | -------- | ----------- |
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| `0` | uint32_t | Progress |
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#### Fields details
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**Progress**:
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| value | description |
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| ------ | ------------------------------------------------------- |
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| `1` | Update process has started flashing MCU software |
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| `2` | Update process has started flashing FPGA firmware |
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| `3` | Update process has started flashing bootloader software |
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| `0x80` | Firmware update process was successful |
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| `0xFF` | Error encountered during firmware update process |
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