我在 CX3 中实现了亮度、对比度、伽玛等属性控制代码，但在 AMCAP 中更改每个项目并按确定关闭 AMCAP 后，当我再次查看 AMCAP 中的属性值时，设置却没有更新。
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CyU3PReturnStatus_t HandlegammaControlReq(uint8_t bRequest) //
{
CyU3PReturnStatus_t status=CY_U3P_SUCCESS;
uint16_t readCount;
static uint16_t gammaVal;
switch(bRequest)
{
case CX3_USB_UVC_GET_LEN_REQ：// gammaVal 数据的长度 = 2 个字节。
glGammaEp0Buffer[0] = 2;
CyU3PUsbSendEP0Data (2, (uint8_t *)glGammaEp0Buffer);
break;
case CX3_USB_UVC_GET_CUR_REQ: // 当前 gammaVal 值。
CyU3PUsbSendEP0Data (2, (uint8_t *)glGammaEp0Buffer);
break;
case CX3_USB_UVC_GET_MIN_REQ: // Minimum gammaVal = 26.
glGammaEp0Buffer[0] = 26;
CyU3PUsbSendEP0Data (2, (uint8_t *)glGammaEp0Buffer);
break;
case CX3_USB_UVC_GET_MAX_REQ: // Maximum gammaVal = 70.
glGammaEp0Buffer[0] = 70;
CyU3PUsbSendEP0Data (2, (uint8_t *)glGammaEp0Buffer);
break;
case CX3_USB_UVC_GET_RES_REQ: // Resolution = 1.
glGammaEp0Buffer[0] = 1;
CyU3PUsbSendEP0Data (2, (uint8_t *)glGammaEp0Buffer);
break;
case CX3_USB_UVC_GET_INFO_REQ：// 支持 GET 和 SET 请求，不支持自动模式
glGammaEp0Buffer[0] = 3;
CyU3PUsbSendEP0Data (2, (uint8_t *)glGammaEp0Buffer);
break;
case CX3_USB_UVC_GET_DEF_REQ: // 默认 gammaVal 值 = 0。
glGammaEp0Buffer[0] = 40;
CyU3PUsbSendEP0Data (2, (uint8_t *)glGammaEp0Buffer);
break;
case CX3_USB_UVC_SET_CUR_REQ: // Update gammaVal value.
status = CyU3PUsbGetEP0Data (CX3_UVC_MAX_PROBE_SETTING_ALIGNED, glGammaEp0Buffer, readCount);
if (status == CY_U3P_SUCCESS)
{
// 仅当值在范围内时更新伽玛值
gammaVal = glGammaEp0Buffer[0]; //原值
I2C_SensorWrite(0x700A,2,glGammaEp0Buffer);
glGammaEp0Buffer[0] = gammaVal;
}
break;
默认：
CyU3PUsbStall (0, CyTrue, CyFalse);
break;
}
return status;
}