Posted on September 04, 2014 at 16:02
OK, good.
To reduce the example footprint, andsince only one allocation is handled in the CDC classdriver,the toolchain dynamic allocation is replaced by a static allocationby returning the address of a pre-defined static buffer with the CDC class structure size.
You've only to define within the
usbd_conf.h file:
#define MAX_STATIC_ALLOC_SIZE 140
/*CDC Class Driver Structure size*/
#define USBD_malloc (uint32_t *)USBD_static_malloc
#define USBD_free USBD_static_free
And within the
usbd_conf.cfile:
/**
* @brief static single allocation.
* @param size: size of allocated memory
* @retval None
*/
void *USBD_static_malloc(uint32_t size)
{
static uint32_t mem[MAX_STATIC_ALLOC_SIZE];
return mem;
}
/**
* @brief Dummy memory free
* @param *p pointer to allocated memory address
* @retval None
*/
void USBD_static_free(void *p)
{
}
For more details you can refer to the STM32CubeF3 firmware package available
http://www.st.com/web/catalog/tools/FM147/CL1794/SC961/SS1743/LN1897/PF260613?icmp=pf260613_****_nb_jun2014&sc=stm32cubef3-pr#
.
Let's try it and keep us informed about your finding.
Regards.
