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Embedded C project:18/12/2014
Dependencies: DS1307 TextLCD mbed
Diff: NetServices/drv/usb/usb_mem.c
- Revision:
- 0:8d87bc453349
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/NetServices/drv/usb/usb_mem.c Thu Dec 18 09:35:49 2014 +0000 @@ -0,0 +1,108 @@ + +/* +Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com) + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. +*/ + +#include "usb_mem.h" + +#include "string.h" //For memcpy, memmove, memset + +#include "netCfg.h" +#if NET_USB + +#define EDS_COUNT 4 +#define TDS_COUNT 8 + +#define HCCA_SIZE 0x100 +#define ED_SIZE 0x10 +#define TD_SIZE 0x10 + +#define TOTAL_SIZE (HCCA_SIZE + (EDS_COUNT*ED_SIZE) + (TDS_COUNT*TD_SIZE)) + + +static volatile __align(256) byte usb_buf[TOTAL_SIZE] __attribute((section("AHBSRAM1"),aligned)); //256 bytes aligned! + +static volatile byte* usb_hcca; //256 bytes aligned! + +static volatile byte* usb_edBuf; //4 bytes aligned! +static volatile byte* usb_tdBuf; //4 bytes aligned! + +static byte usb_edBufAlloc[EDS_COUNT] __attribute((section("AHBSRAM1"),aligned)); +static byte usb_tdBufAlloc[TDS_COUNT] __attribute((section("AHBSRAM1"),aligned)); + +void usb_mem_init() +{ + usb_hcca = usb_buf; + usb_edBuf = usb_buf + HCCA_SIZE; + usb_tdBuf = usb_buf + HCCA_SIZE + (EDS_COUNT*ED_SIZE); + memset(usb_edBufAlloc, 0, EDS_COUNT); + memset(usb_tdBufAlloc, 0, TDS_COUNT); +} + +volatile byte* usb_get_hcca() +{ + return usb_hcca; +} + +volatile byte* usb_get_ed() +{ + int i; + for(i = 0; i < EDS_COUNT; i++) + { + if( !usb_edBufAlloc[i] ) + { + usb_edBufAlloc[i] = 1; + return usb_edBuf + i*ED_SIZE; + } + } + return NULL; //Could not alloc ED +} + +volatile byte* usb_get_td() +{ + int i; + for(i = 0; i < TDS_COUNT; i++) + { + if( !usb_tdBufAlloc[i] ) + { + usb_tdBufAlloc[i] = 1; + return usb_tdBuf + i*TD_SIZE; + } + } + return NULL; //Could not alloc TD +} + +void usb_free_ed(volatile byte* ed) +{ + int i; + i = (ed - usb_edBuf) / ED_SIZE; + usb_edBufAlloc[i] = 0; +} + +void usb_free_td(volatile byte* td) +{ + int i; + i = (td - usb_tdBuf) / TD_SIZE; + usb_tdBufAlloc[i] = 0; +} + + +#endif