add examples

RTL00_SDKV35a/example_sources/spi_twoboard/readme.txt

@@ -0,0 +1,24 @@
+Example Description
+
+This example describes how to use SPI read/write by mbed api.
+
+
+The SPI Interface provides a "Serial Peripheral Interface" Master.
+
+This interface can be used for communication with SPI slave devices,
+such as FLASH memory, LCD screens and other modules or integrated circuits.
+
+
+In this example, we use config SPI_IS_AS_MASTER to decide if device is master or slave.
+    If SPI_IS_AS_MASTER is 1, then device is master.
+    If SPI_IS_AS_MASTER is 0, then device is slave.
+
+We connect wires as below:
+    master's MOSI (PC_2) connect to slave's MOSI (PC_2)
+    master's MISO (PC_3) connect to slave's MISO (PC_3)
+    master's SCLK (PC_1) connect to slave's SCLK (PC_1)
+    master's CS   (PC_0) connect to slave's CS   (PC_0)
+
+This example shows master sends data to slave.
+We bootup slave first, and then bootup master.
+Then log will presents that master sending data to slave.

RTL00_SDKV35a/example_sources/spi_twoboard/src/main.c

@@ -0,0 +1,64 @@
+/*
+ *  Routines to access hardware
+ *
+ *  Copyright (c) 2014 Realtek Semiconductor Corp.
+ *
+ *  This module is a confidential and proprietary property of RealTek and
+ *  possession or use of this module requires written permission of RealTek.
+ */
+
+#include "device.h"
+#include "main.h"
+#include "spi_api.h"
+
+#define SPI_IS_AS_MASTER 1
+
+// SPI0
+#define SPI0_MOSI  PC_2
+#define SPI0_MISO  PC_3
+#define SPI0_SCLK  PC_1
+#define SPI0_CS    PC_0
+
+/**
+  * @brief  Main program.
+  * @param  None
+  * @retval None
+  */
+void main(void)
+{
+    int TestingTimes = 10;
+    int Counter      = 0;
+    int TestData     = 0;
+
+#if SPI_IS_AS_MASTER
+    spi_t spi_master;
+
+    SPI0_IS_AS_SLAVE = 0;
+    spi_init(&spi_master, SPI0_MOSI, SPI0_MISO, SPI0_SCLK, SPI0_CS);
+
+    DBG_SSI_INFO("--------------------------------------------------------\n");
+    for(Counter = 0, TestData=0xFF; Counter < TestingTimes; Counter++) {
+        spi_master_write(&spi_master, TestData);
+        DBG_SSI_INFO("Master write: %02X\n", TestData);
+        TestData--;
+    }
+    spi_free(&spi_master);
+
+#else
+    spi_t spi_slave;
+
+    SPI0_IS_AS_SLAVE = 1;
+    spi_init(&spi_slave,  SPI0_MOSI, SPI0_MISO, SPI0_SCLK, SPI0_CS);
+
+    DBG_SSI_INFO("--------------------------------------------------------\n");
+    for(Counter = 0, TestData=0xFF; Counter < TestingTimes; Counter++) {
+        DBG_SSI_INFO(ANSI_COLOR_CYAN"Slave  read : %02X\n"ANSI_COLOR_RESET,
+                spi_slave_read(&spi_slave));
+        TestData--;
+    }
+    spi_free(&spi_slave);
+#endif
+
+    DBG_SSI_INFO("SPI Demo finished.\n");
+    for(;;);
+}