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--- en:xu4_hardware_hsi2c [2015/08/20 16:12]
charles.park
+++ en:xu4_hardware_hsi2c [2017/04/26 14:57] (current)
charles.park
@@ Line 1: / Line 1: @@
+====== HS-I2C (HighSpeed) ======
+This page introduces how you can I2C interface using Expansion Board.
+The Expansion Board have two I2C devices.\\
+You can use the devices via H/W I2C(I2C-A : HS-I2C).
+{{:en:xu4:xu4_hsi2c_with_expansion.png?700|}}
+**H/W I2C(I2C-A : HS-I2C)**
+^  Kernel 3.10.y\\ (node name)  ^  Kernel 4.9.y\\ (node name)  ^  Pin Number\\ (XU4-CON11)  ^  Net Name            ^  Export Number  ^  Description  ^
+|  /dev/i2c-1                   |  /dev/i2c-5                  |  4                         |  GPA2[2](I2C_5.SDA)  |  187            |  SDA          |
+|  :::                          |  :::                         |  6                         |  GPA2[3](I2C_5.SCL)  |  188            |  SCL          |
+<note warning>I2C-A(HS-I2C) doesn't work with i2cdetect command on Kenrnel 3.10.y</note>
+  * Using the H/W I2C(I2C-A : HS-I2C) with Expansion Board. I2C Physical Address : 0x12CB0000
+**HW-HSI2C Test Code**
+<file c xu4_hsi2c.c>
+//------------------------------------------------------------------------------------------------------------
+//
+// ODROID-XU4 with Shifter Shield I2C Test Application.
+// I2C Node : /dev/i2c-3
+//
+// Compile : gcc -o <create excute file name> <source file name>
+// Run : sudo ./<created excute file name>
+//
+//------------------------------------------------------------------------------------------------------------
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+//------------------------------------------------------------------------------------------------------------
+//
+// Global handle Define
+//
+//------------------------------------------------------------------------------------------------------------
+// I2C definitions
+#define I2C_SLAVE	0x0703
+#define I2C_SMBUS	0x0720	/* SMBus-level access */
+#define I2C_SMBUS_READ	1
+#define I2C_SMBUS_WRITE	0
+// SMBus transaction types
+#define I2C_SMBUS_QUICK		    0
+#define I2C_SMBUS_BYTE		    1
+#define I2C_SMBUS_BYTE_DATA	    2
+#define I2C_SMBUS_WORD_DATA	    3
+#define I2C_SMBUS_PROC_CALL	    4
+#define I2C_SMBUS_BLOCK_DATA	    5
+#define I2C_SMBUS_I2C_BLOCK_BROKEN  6
+#define I2C_SMBUS_BLOCK_PROC_CALL   7		/* SMBus 2.0 */
+#define I2C_SMBUS_I2C_BLOCK_DATA    8
+// SMBus messages
+#define I2C_SMBUS_BLOCK_MAX	    32	/* As specified in SMBus standard */
+#define I2C_SMBUS_I2C_BLOCK_MAX	32	/* Not specified but we use same structure */
+// Structures used in the ioctl() calls
+union i2c_smbus_data
+{
+  uint8_t   byte;
+  uint16_t  word;
+  uint8_t   block [I2C_SMBUS_BLOCK_MAX + 2] ;	// block [0] is used for length + one more for PEC
+};
+struct i2c_smbus_ioctl_data
+{
+  char                  read_write;
+  uint8_t               command ;
+  int                   size;
+  union i2c_smbus_data  *data;
+};
+static inline int i2c_smbus_access (int fd, char rw, uint8_t command, int size, union i2c_smbus_data *data)
+{
+  struct i2c_smbus_ioctl_data args ;
+  args.read_write = rw ;
+  args.command    = command ;
+  args.size       = size ;
+  args.data       = data ;
+  return ioctl (fd, I2C_SMBUS, &args) ;
+}
+int i2c_smbus_read_byte_data(int fd, int reg)
+{
+  union i2c_smbus_data data;
+  if (i2c_smbus_access (fd, I2C_SMBUS_READ, reg, I2C_SMBUS_BYTE_DATA, &data))
+    return -1 ;
+  else
+    return data.byte & 0xFF ;
+}
+//------------------------------------------------------------------------------------------------------------
+//
+// I2C:
+//
+//------------------------------------------------------------------------------------------------------------
+// kernel 4.9.y device node
+// const char *i2cHandleNode = "/dev/i2c-5";
+// kernel 3.10.y device node
+const char *i2cHandleNode = "/dev/i2c-1";
+static  int i2c_fd = -1;
+//------------------------------------------------------------------------------------------------------------
+//------------------------------------------------------------------------------------------------------------
+//
+// LCD Update Function:
+//
+//------------------------------------------------------------------------------------------------------------
+static void data_update (void)
+{
+    int val1, val2;
+    static  unsigned long   count = 0;
+    if(i2c_fd == -1)    return;
+    // set BH1780 Sensor I2C Address
+    if(ioctl(i2c_fd, I2C_SLAVE, 0x29) < 0)  {
+        fprintf(stdout, "%s : ioctl BH1780 I2C_SLAVE Setup Error!\n", __func__);
+        return;
+    }
+    // BH1780 Part ID Read
+    val1 = i2c_smbus_read_byte_data(i2c_fd, 0x0A);
+    // set Pressure Sensor I2C Address
+    if(ioctl(i2c_fd, I2C_SLAVE, 0x77) < 0)  {
+        fprintf(stdout, "%s : ioctl PRESSURE I2C_SLAVE Setup Error!\n", __func__);
+        return;
+    }
+    // Pressure Sensor CHIP ID Read
+    val2 = i2c_smbus_read_byte_data(i2c_fd, 0xD0);
+    fprintf(stdout, "%s : count = %ld BH1780 ID = 0x%02X, PRESSURE ID = 0x%02X\n", __func__, count++, val1, val2);
+}
+//------------------------------------------------------------------------------------------------------------
+//
+// system init
+//
+//------------------------------------------------------------------------------------------------------------
+int system_init(void)
+{
+    if((i2c_fd = open(i2cHandleNode, O_RDWR)) < 0)  {
+        fprintf(stdout, "%s : %s Open Error!\n", __func__, i2cHandleNode);
+        return  -1;
+    }
+    return  0;
+ }
+//------------------------------------------------------------------------------------------------------------
+//
+// Start Program
+//
+//------------------------------------------------------------------------------------------------------------
+int main (int argc, char *argv[])
+{
+    if (system_init() < 0)
+    {
+        fprintf (stderr, "%s: System Init failed\n", __func__); fflush(stdout);
+        return -1;
+    }
+    for(;;)    {
+        usleep(100000);
+        data_update();  fflush(stdout);
+    }
+    return 0 ;
+}
+//------------------------------------------------------------------------------------------------------------
+//------------------------------------------------------------------------------------------------------------
+</file>