keybrd library is an open source library for creating custom-keyboard firmware.
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- // getFreeSRAM.h copied from
- // http://andybrown.me.uk/2011/01/01/debugging-avr-dynamic-memory-allocation/
- /*
- * memdebug.h
- *
- * Created on: 15 Dec 2010
- * Author: Andy Brown
- *
- * Use without attribution is permitted provided that this
- * header remains intact and that these terms and conditions
- * are followed:
- *
- * http://andybrown.me.uk/ws/terms-and-conditions
- */
-
- #include <inttypes.h>
-
- extern unsigned int __bss_end;
- extern unsigned int __heap_start;
- extern void *__brkval;
-
- //measure and return amount of free SRAM
- /*
- uint16_t getFreeSRAM()
- {
- uint8_t newVariable;
- // if heap is empty, use bss as start memory address
- if ((uint16_t)__brkval == 0)
- {
- return (((uint16_t)&newVariable) - ((uint16_t)&__bss_end));
- }
- // else use heap end as the start of the memory address
- else
- {
- return (((uint16_t)&newVariable) - ((uint16_t)__brkval));
- }
- };
- */
- // uint32_t for Teensy LC
- uint32_t getFreeSRAM()
- {
- uint8_t newVariable;
- // if heap is empty, use bss as start memory address
- if ((uint32_t)__brkval == 0)
- {
- return (((uint32_t)&newVariable) - ((uint32_t)&__bss_end));
- }
- // else use heap end as the start of the memory address
- else
- {
- return (((uint32_t)&newVariable) - ((uint32_t)__brkval));
- }
- };
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