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project/realtek_ameba1_va0_example/example_sources/spi/readme.txt

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+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, it use 2 sets of SPI. One is master, the other is slave.
+By default it use SPI0 as slave, and use SPI2 as master.
+So we connect them as below:
+    Connect SPI0_MOSI (PC_2) to SPI2_MOSI (PA_1)
+    Connect SPI0_MISO (PC_3) to SPI2_MISO (PA_0)
+    Connect SPI0_SCLK (PC_1) to SPI2_SCLK (PA_2)
+    Connect SPI0_CS   (PC_0) to SPI2_CS   (PA_4)
+
+Because some GPIOA are used as SDIO purpose which has higher priority.
+So we need pull high PA_7 when device boot up.
+    Connect PA_7 to 3V3
+
+After boot up, the master will send data to slave and shows result on LOG_OUT.

project/realtek_ameba1_va0_example/example_sources/spi/src/main.c

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+/*
+ *  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 "diag.h"
+#include "main.h"
+#include "spi_api.h"
+
+#define FakeMbedAPI  1
+
+// SPI0 (S0)
+#define SPI0_MOSI  PC_2
+#define SPI0_MISO  PC_3
+#define SPI0_SCLK  PC_1
+#define SPI0_CS    PC_0
+
+// SPI1 (S1)
+#define SPI1_MOSI  PB_6
+#define SPI1_MISO  PB_7
+#define SPI1_SCLK  PB_5
+#define SPI1_CS    PB_4
+
+#if 1
+// SPI2 (S2) for DEV 3V0
+// Please note that PA_7 need pull high before using GPIOA group
+#define SPI2_MOSI  PA_1
+#define SPI2_MISO  PA_0
+#define SPI2_SCLK  PA_2
+#define SPI2_CS    PA_4
+#else
+// SPI2 (S2)
+#define SPI2_MOSI  PD_2
+#define SPI2_MISO  PD_3
+#define SPI2_SCLK  PD_1
+#define SPI2_CS    PD_0
+#endif
+
+/**
+  * @brief  Main program.
+  * @param  None
+  * @retval None
+  */
+spi_t spi_master;
+spi_t spi_slave;
+
+void main(void)
+{
+#if FakeMbedAPI
+
+    /* SPI0 is as Slave */
+    //SPI0_IS_AS_SLAVE = 1;
+
+    spi_init(&spi_master, SPI2_MOSI, SPI2_MISO, SPI2_SCLK, SPI2_CS);
+	spi_format(&spi_master, 8, 0, 0);
+	spi_frequency(&spi_master, 200000);
+    spi_init(&spi_slave,  SPI0_MOSI, SPI0_MISO, SPI0_SCLK, SPI0_CS);
+	spi_format(&spi_slave, 8, 0, 1);
+
+    int TestingTimes = 10;
+    int Counter      = 0;
+    int TestData     = 0;
+    int ReadData     = 0;
+
+    int result = 1;
+
+    /**
+     * Master read/write, Slave read/write
+     */
+    DBG_SSI_INFO("--------------------------------------------------------\n");
+    for(Counter = 0, TestData=0x01; Counter < TestingTimes; Counter++)
+    {
+        ReadData = spi_master_write(&spi_master, TestData);
+        DBG_SSI_INFO("Master write: %02X, read: %02X\n", TestData, ReadData);
+        if (TestData - 1 != ReadData) {
+            result = 0;
+        }
+
+        TestData++;
+
+        spi_slave_write(&spi_slave, TestData);
+        ReadData = spi_slave_read(&spi_slave);
+        DBG_SSI_INFO(ANSI_COLOR_CYAN"Slave  write: %02X, read: %02X\n"ANSI_COLOR_RESET, TestData, ReadData);
+        if (TestData - 1 != ReadData) {
+            result = 0;
+        }
+
+        TestData++;
+    }
+
+    /**
+     * Master write, Slave read
+     */
+    DBG_SSI_INFO("--------------------------------------------------------\n");
+    for(Counter = 0, TestData=0xFF; Counter < TestingTimes; Counter++)
+    {
+        spi_master_write(&spi_master, TestData);
+        ReadData = spi_slave_read(&spi_slave);
+        DBG_SSI_INFO("Master write: %02X\n", TestData);
+        DBG_SSI_INFO(ANSI_COLOR_CYAN"Slave  read : %02X\n"ANSI_COLOR_RESET, ReadData);
+        if (TestData != ReadData) {
+            result = 0;
+        }
+
+        TestData--;
+    }
+
+    spi_free(&spi_master);
+    spi_free(&spi_slave);
+
+    DBG_SSI_INFO("SPI Demo finished.\n");
+
+    printf("\r\nResult is %s\r\n", (result) ? "success" : "fail");
+
+    for(;;);
+
+#else  // mbed SPI API emulation
+
+#endif
+
+}
+