DMA receive memory location fixed
#define PROCESS_ON_EVENT 1
#if USART_USE_DMA
-uint8_t usart_mem[0x1000] __attribute__((at(0x20000000)));
+uint8_t usart_mem[0x1000] __attribute__((at(0x20010000)));
uint16_t old_pos;
static uint8_t is_running;
