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/**
******************************************************************************
* @file usbh_hid_parser.c
* @author MCD Application Team
* @version V3.0.0
* @date 18-February-2014
* @brief This file is the HID Layer Handlers for USB Host HID class.
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "usbh_hid_parser.h"
/** @addtogroup USBH_LIB
* @{
*/
/** @addtogroup USBH_CLASS
* @{
*/
/** @addtogroup USBH_HID_CLASS
* @{
*/
/** @defgroup USBH_HID_PARSER
* @brief This file includes HID parsers for USB Host HID class.
* @{
*/
/** @defgroup USBH_HID_PARSER_Private_TypesDefinitions
* @{
*/
/**
* @}
*/
/** @defgroup USBH_HID_PARSER_Private_Defines
* @{
*/
/**
* @}
*/
/** @defgroup USBH_HID_PARSER_Private_Macros
* @{
*/
/**
* @}
*/
/** @defgroup USBH_HID_PARSER_Private_FunctionPrototypes
* @{
*/
/**
* @}
*/
/** @defgroup USBH_HID_PARSER_Private_Variables
* @{
*/
/**
* @}
*/
/** @defgroup USBH_HID_PARSER_Private_Functions
* @{
*/
/**
* @brief HID_ReadItem
* The function read a report item.
* @param ri: report item
* @param ndx: report index
* @retval status (0 : fail / otherwise: item value)
*/
uint32_t HID_ReadItem(HID_Report_ItemTypedef *ri, uint8_t ndx)
{
uint32_t val=0;
uint32_t x=0;
uint32_t bofs;
uint8_t *data=ri->data;
uint8_t shift=ri->shift;
/* get the logical value of the item */
/* if this is an array, wee may need to offset ri->data.*/
if (ri->count > 0)
{
/* If app tries to read outside of the array. */
if (ri->count <= ndx)
{
return(0);
}
/* calculate bit offset */
bofs = ndx*ri->size;
bofs += shift;
/* calculate byte offset + shift pair from bit offset. */
data+=bofs/8;
shift=(uint8_t)(bofs%8);
}
/* read data bytes in little endian order */
for(x=0; x < ((ri->size & 0x7) ? (ri->size/8)+1 : (ri->size/8)); x++)
{
val=(uint32_t)(*data << (x*8));
}
val=(val >> shift) & ((1<<ri->size)-1);
if (val < ri->logical_min || val > ri->logical_max)
{
return(0);
}
/* convert logical value to physical value */
/* See if the number is negative or not. */
if ((ri->sign) && (val & (1<<(ri->size-1))))
{
/* yes, so sign extend value to 32 bits. */
int vs=(int)((-1 & ~((1<<(ri->size))-1)) | val);
if(ri->resolution == 1)
{
return((uint32_t)vs);
}
return((uint32_t)(vs*ri->resolution));
}
else
{
if(ri->resolution == 1)
{
return(val);
}
return(val*ri->resolution);
}
}
/**
* @brief HID_WriteItem
* The function write a report item.
* @param ri: report item
* @param ndx: report index
* @retval status (1: fail/ 0 : Ok)
*/
uint32_t HID_WriteItem(HID_Report_ItemTypedef *ri, uint32_t value, uint8_t ndx)
{
uint32_t x;
uint32_t mask;
uint32_t bofs;
uint8_t *data=ri->data;
uint8_t shift=ri->shift;
if (value < ri->physical_min || value > ri->physical_max)
{
return(1);
}
/* if this is an array, wee may need to offset ri->data.*/
if (ri->count > 0)
{
/* If app tries to read outside of the array. */
if (ri->count >= ndx)
{
return(0);
}
/* calculate bit offset */
bofs = ndx*ri->size;
bofs += shift;
/* calculate byte offset + shift pair from bit offset. */
data+=bofs/8;
shift=(uint8_t)(bofs%8);
}
/* Convert physical value to logical value. */
if (ri->resolution != 1)
{
value=value/ri->resolution;
}
/* Write logical value to report in little endian order. */
mask=(uint32_t)((1<<ri->size)-1);
value = (value & mask) << shift;
for(x=0; x < ((ri->size & 0x7) ? (ri->size/8)+1 : (ri->size/8)); x++)
{
*(ri->data+x)=(uint8_t)((*(ri->data+x) & ~(mask>>(x*8))) | ((value>>(x*8)) & (mask>>(x*8))));
}
return(0);
}
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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