Diff: SourceFiles/RSEDP_AM_ADC5263_Digital_Pot.cpp

Revision:

0:5b7639d1f2c4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SourceFiles/RSEDP_AM_ADC5263_Digital_Pot.cpp	Fri Nov 19 09:49:16 2010 +0000
@@ -0,0 +1,79 @@
+/* Source Driver File for the AD5263 Digital Potentiometer */
+/* ******************************************************* */
+
+/* Version 1.00 */
+/* Last Ammend Date: 23/6/09 */
+
+
+#define _AD5263_
+
+
+
+/* Include Files Here */
+#include "mbed.h"                                /* mbed header file */
+#include "misra_types.h"                         /* MISRA Types header file */
+#include "defines.h"
+#include "RSEDP_Slave_Address_Defines.h"        /* Slave address of I2C Peripherals */
+
+#include "RSEDP_CNTRL_I2C.h"                    /* Control I2C Driver */
+
+
+
+
+
+
+
+/* Function Prototypes */
+sint32_t RSEDP_AM_Init_AD5263(uint8_t I2C_addr) ;
+sint32_t RSEDP_AM_Set_AD5263_resistance(uint8_t I2C_addr, uint8_t uiChannel, uint16_t uiResistance_Ohms) ;
+
+
+/* Global Variables */
+uint16_t AD5263_default_resistances[AD5263_No_Of_Channels] = { AD5263_RDAC1_Default_Resistance, AD5263_RDAC2_Default_Resistance, AD5263_RDAC3_Default_Resistance, AD5263_RDAC4_Default_Resistance } ;
+
+
+
+
+
+
+/* Reset and initialise AD5623 RDAC */
+sint32_t RSEDP_AM_Init_AD5263(uint8_t I2C_addr)
+    {
+        sint8_t uiSetup_byte = 0;
+        uint8_t uiChannel_no = 0;
+        sint32_t Ack_Status = 0;
+
+        for(uiChannel_no = 0; uiChannel_no < AD5263_No_Of_Channels ; uiChannel_no++)
+            {
+                /* Create Setup Byte */
+                /* Set channel 0 to midscale */
+                   uiSetup_byte = AD5263_RDAC_Midscale_Reset | (uiChannel_no << 5) ;
+
+                /* Send Command */
+                Ack_Status = CNTRL_I2C_Master_Mode_Transmit(I2C_addr, &uiSetup_byte, 1) ;
+               }
+        return Ack_Status; 
+    }
+
+
+
+/* Convert a raw value in Ohms to a resistance */
+sint32_t RSEDP_AM_Set_AD5263_resistance(uint8_t I2C_addr, uint8_t uiChannel, uint16_t uiResistance_Ohms)
+    {
+        sint32_t Ack_Status = 0;
+        uint16_t uiScaled_resistance = 0;
+        sint8_t uiMessage[3] = {0,0,0};
+
+        /* Set channel */
+          uiMessage[0] = ((uiChannel-1) << 5) ;
+
+        /* Convert resistance in Ohms to a number of steps */
+        uiScaled_resistance = ((uint32_t)uiResistance_Ohms * AD5263_Resolution)/AD5263_Max_Resistance ;
+          uiMessage[1] = uiScaled_resistance ;
+    
+        /* Send command */
+        Ack_Status = CNTRL_I2C_Master_Mode_Transmit(I2C_addr, uiMessage, 2) ;
+        return Ack_Status;
+    }
+
+