add uart_dma demo

lib/bsp/device/uart.cpp

@@ -177,6 +177,7 @@ public:
                 xSemaphoreTake(session_.stage_completion_event, portMAX_DELAY);
                 next_free_buffer = session_.next_free_buffer;
             }
+            configASSERT(session_.buffer_ptr + buffer.size() * sizeof(uint32_t) <= session_.buffer_size);
             uint32_t *v_recv_buf = (uint32_t *)(session_.buffer + session_.buffer_size * next_free_buffer + session_.buffer_ptr);
             for(uint32_t i = 0; i < buffer.size(); i++)
             {

src/uart_dma/README.md

@@ -0,0 +1,5 @@
+UART use dma
+=====
+"project_cfg.h" is the hardware related configuration files. Include pin config ...
+
+1.Serial write and display.

src/uart_dma/main.c

@@ -0,0 +1,42 @@
+/* Copyright 2018 Canaan Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <devices.h>
+#include <stdio.h>
+#include <string.h>
+#include "project_cfg.h"
+
+handle_t uart1;
+
+int main()
+{
+    uint8_t recv[12] = {0};
+    uart1 = io_open("/dev/uart1");
+
+    uart_config(uart1, 115200, 8, UART_STOP_1, UART_PARITY_NONE);
+    uart_set_read_timeout(uart1, 10*1000);
+	
+    char *hel = {"hello uart!\n"};
+    io_write(uart1, (uint8_t *)hel, strlen(hel));
+	uart_config_use_dma(uart1, 10, UART_USE_DMA);
+    while (1)
+    {
+		
+        if(io_read(uart1, recv, 10) < 0)
+            printf("time out \n");
+        io_write(uart1, recv, 10);
+
+
+    }
+}

src/uart_dma/project_cfg.h

@@ -0,0 +1,30 @@
+/* Copyright 2018 Canaan Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef _PROJECT_CFG_H_
+#define _PROJECT_CFG_H_
+#include <pin_cfg.h>
+
+const fpioa_cfg_t g_fpioa_cfg =
+{
+    .version = PIN_CFG_VERSION,
+    .functions_count = 2,
+    .functions =
+    {
+        {30, FUNC_UART1_RX},
+        {31, FUNC_UART1_TX}
+    }
+};
+
+#endif