自定义内存池直接定义到RAM上，这样可以直接被DMA访问到

bspMCU/My_print.c

@@ -30,18 +30,13 @@ volatile uint8_t g_flow_control_paused = 0;
 
 TComCtrl *g_ptUartCtrl; 
 
-__attribute__((section(".dma_buffer"), aligned(32)))
-static uint8_t uart_tx_buffer[512];
-
 int USART_Send(char *_pBuffer, uint32_t _iSize)
 {
 	HAL_GPIO_WritePin(RS485_2_DIR_GPIO_Port, RS485_2_DIR_Pin,GPIO_PIN_SET);
     TUartUserData *ptUartUserData = (TUartUserData *)g_ptUartCtrl->m_pUserData;
 //    int iRet = HAL_UART_Transmit(ptUartUserData->m_uart, (uint8_t *)_pBuffer, _iSize, 100);
 //    HAL_GPIO_WritePin(RS485_2_DIR_GPIO_Port, RS485_2_DIR_Pin,GPIO_PIN_RESET);
-    RD_MEMCPY(uart_tx_buffer, _pBuffer, _iSize);
+    int iRet = HAL_UART_Transmit_DMA(ptUartUserData->m_uart, (uint8_t *)_pBuffer, _iSize);
-    //SCB_CleanDCache_by_Addr((uint32_t*)uart_tx_buffer, _iSize);
-    int iRet = HAL_UART_Transmit_DMA(ptUartUserData->m_uart, (uint8_t *)uart_tx_buffer, _iSize);
 
     return iRet;
 }

library/common/rd_mempool.c

@@ -197,7 +197,7 @@ WEAK void Rd_MemDoInit(void)
     g_pool_start = g_heap_buf;
 #else
     // 静态数组，确保对齐
-    static uint8_t static_pool[MEM_POOL_TOTAL_SIZE] __attribute__((aligned(RD_ALIGN_SIZE)));
+    static uint8_t static_pool[MEM_POOL_TOTAL_SIZE] __attribute__((section(".dma_buffer"), aligned(RD_ALIGN_SIZE)));
     g_pool_start = static_pool;
 #endif