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209f3a3aef
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47 lines
1.6 KiB
JavaScript
47 lines
1.6 KiB
JavaScript
import { DataDirection, SetupRecipient, SetupRequest, SetupType, } from './interfaces.js';
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export function createSetupPacket(params) {
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const setupPacket = new Uint8Array(8);
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setupPacket[0] = (params.dataDirection << 7) | (params.type << 5) | params.recipient;
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setupPacket[1] = params.bRequest;
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setupPacket[2] = params.wValue & 0xff;
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setupPacket[3] = (params.wValue >> 8) & 0xff;
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setupPacket[4] = params.wIndex & 0xff;
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setupPacket[5] = (params.wIndex >> 8) & 0xff;
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setupPacket[6] = params.wLength & 0xff;
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setupPacket[7] = (params.wLength >> 8) & 0xff;
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return setupPacket;
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}
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export function setDeviceAddressPacket(address) {
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return createSetupPacket({
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dataDirection: DataDirection.HostToDevice,
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type: SetupType.Standard,
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recipient: SetupRecipient.Device,
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bRequest: SetupRequest.SetAddress,
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wValue: address,
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wIndex: 0,
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wLength: 0,
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});
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}
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export function getDescriptorPacket(type, length, index = 0) {
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return createSetupPacket({
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dataDirection: DataDirection.DeviceToHost,
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type: SetupType.Standard,
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recipient: SetupRecipient.Device,
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bRequest: SetupRequest.GetDescriptor,
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wValue: type << 8,
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wIndex: index,
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wLength: length,
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});
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}
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export function setDeviceConfigurationPacket(configurationNumber) {
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return createSetupPacket({
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dataDirection: DataDirection.HostToDevice,
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type: SetupType.Standard,
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recipient: SetupRecipient.Device,
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bRequest: SetupRequest.SetDeviceConfiguration,
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wValue: configurationNumber,
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wIndex: 0,
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wLength: 0,
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});
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}
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