[rtt] Re-enable Arduino "loop()" function

- Increase default RTT heap size from 12KB to 20KB
- Add a default thread named "Arduino" (4KB stack size by default) which initialize higher level devices and runs Arduino "loop()" function
- Increase default FinSH stack size from 2KB to 4KB
- Rename user defined RTT setup function from "rt_application_init()" to "rt_setup()"

[drv] Add SPI and SD device drivers

- SPI device driver requires Arduino SPI library
- Enable SD device driver (using SPI1 and ChaN's FatFs) by default for MKR Zero board (SAMD)
- Add FatFs related FinSH commands
- exFAT support may be enabled by macro "RT_DFS_ELM_USE_EXFAT"

Author: onelife

examples/Blink/Blink.ino

@@ -17,7 +17,7 @@ void blink_thread_entry(void* parameter) {
 }
 
 // RT-Thread function called by "RT_T.begin()"
-void rt_application_init(void) {
+void rt_setup(void) {
   // statically initialize user thread
   if (RT_EOK != rt_thread_init(
       &blink_thread,              // [in/out] thread descriptor
@@ -40,7 +40,7 @@ void setup() {
   RT_T.begin();
 }
 
-// this function is not called
+// this function will be called by "Arduino" thread
 void loop() {
-  // no code should be here
+  // may put some code here that will be run repeatedly
 }

examples/FinSH/FinSH.ino

@@ -7,7 +7,7 @@
 // ADD_SHELL_VAR(id, LED ID, led_id, finsh_type_uint)
 // ADD_SHELL_VAR(state, LED state, led_state, finsh_type_uchar)
 
-// After upload, send the following command through "Serial Monitor" to see the result.
+// After upload, send the following command through "Serial Monitor" and check the result.
 // led(0, 1)
 // led(0, 0)
 // led(id, state)
@@ -40,7 +40,7 @@ void setup() {
   RT_T.begin();
 }
 
-// this function is not called
+// this function will be called by "Arduino" thread
 void loop() {
-  // no code should be here
+  // may put some code here that will be run repeatedly
 }

library.properties

@@ -1,6 +1,6 @@
 name=RT-Thread
-version=0.2.2
-author=Bernard Xiong <[email protected]>
+version=0.3.0
+author=Bernard Xiong <[email protected]>, onelife <[email protected]>
 maintainer=onelife <[email protected]>
 sentence=Real Time Operating System porting for Arduino SAM and SAMD boards
 paragraph=RT-Thread is an open source IoT operating system from China, which has strong scalability: from a tiny kernel running on a tiny core, for example ARM Cortex-M0, or Cortex-M3/4/7, to a rich feature system running on MIPS32, ARM Cortex-A8, ARM Cortex-A9 DualCore etc.

src/components/arduino/drv_common.h

@@ -0,0 +1,17 @@
+/***************************************************************************//**
+ * @file    drv_common.h
+ * @brief   Arduino RT-Thread library device driver common header
+ * @author  onelife <onelife.real[at]gmail.com>
+ ******************************************************************************/
+#ifndef __DRV_COMMON_H__
+#define __DRV_COMMON_H__
+
+/* Includes ------------------------------------------------------------------*/
+/* Exported defines ----------------------------------------------------------*/
+#define RT_DEVICE_CTRL_SPI_SPEED                (0xF1)
+
+/* Exported types ------------------------------------------------------------*/
+/* Exported constants --------------------------------------------------------*/
+/* Exported functions ------------------------------------------------------- */
+
+#endif /* __DRV_COMMON_H__ */