Diff: SourceFiles/RSEDP_BB_PCA9675_Serial_Input_Latch.cpp

Revision:

0:5b7639d1f2c4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SourceFiles/RSEDP_BB_PCA9675_Serial_Input_Latch.cpp	Fri Nov 19 09:49:16 2010 +0000
@@ -0,0 +1,187 @@
+/* Software Driver for Serial Input Latch PCA9675 on the RS-EDP Base Board */
+/* *********************************************************************** */
+
+
+
+/* Version 1.00 */
+
+
+
+/* Include Files */
+/* 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 "mbed_Port_Structure.h"                /* Port structure for MBED Module */
+#include "RSEDP_CNTRL_I2C.h"                    /* Control I2C Driver */
+
+
+
+/* Function Prototypes Defines Here */
+sint32_t RSEDP_BB_setup_PCA9675(uint8_t Slave_Address);                                                          /* Setup and configure the I/O latch */
+sint32_t RSEDP_BB_PCA9675_reset(uint8_t Slave_Address);                                                          /* Reset the device using a general call */
+sint32_t RSEDP_BB_PCA9675_write_data(uint8_t Slave_Address, uint8_t port0_payload,uint8_t port1_payload);        /* Write two bytes of data to the device */
+sint32_t RSEDP_BB_PCA9675_read_data(uint8_t Slave_Address, uint8_t *read_port0, uint8_t *read_port1);            /* Read two bytes from the device */
+sint32_t RS_EDP_BB_Read_DIP_Switch(uint8_t Switch_Number);                                                       /* Read the switch position - either on or off */
+
+
+
+
+
+/* Configure the Serial I/O Expander IC */
+sint32_t RSEDP_BB_setup_PCA9675(uint8_t Slave_Address)
+    {
+       sint32_t Ack_Status = 0;
+        /* Assume the I2C peripheral and MCU I/O is already configured */
+
+        Ack_Status = RSEDP_BB_PCA9675_reset(Slave_Address);                                              /* Reset the device */
+        if (Ack_Status == ACK)
+            {
+                Ack_Status = RSEDP_BB_PCA9675_write_data(Slave_Address, 0xff,0xff);                                /* This configures all I/O as input */
+            }
+        return Ack_Status;
+    }    
+    
+    
+
+/* Reset the device */                
+sint32_t RSEDP_BB_PCA9675_reset(uint8_t Slave_Address)
+    {
+        sint32_t Ack_Status = 0;
+        sint8_t reset_command = 0x06;                                                   /* Reset command following a general call, address 0 will reset the device */
+
+        Ack_Status = CNTRL_I2C_Master_Mode_Transmit(0x0, &reset_command, 2);            /* Send a general call command, (Slave address 0), plus one byte of value 0x06 */
+                                                                                        /* The PCA9675 does not generate an ACK on a general call */
+        return Ack_Status;                                                                                        
+    }                                    
+
+
+/* Write two byte of data to the device */
+sint32_t RSEDP_BB_PCA9675_write_data(uint8_t Slave_Address, uint8_t port0_payload, uint8_t port1_payload)
+    {
+        sint32_t Ack_Status = 0;
+        sint8_t tx_array[2];                                                        /* Local array of data to be transmitted */
+        
+        tx_array[0] = port0_payload;                                                /* First is for Port 0 */
+        tx_array[1] = port1_payload;                                                /* Second is for Port 1 */
+        
+        Ack_Status = CNTRL_I2C_Master_Mode_Transmit(Slave_Address, tx_array, 2);    /* Send two bytes plus the slave address to the slave */
+        return Ack_Status;
+    }
+
+
+/* Read two bytes from the device */
+sint32_t RSEDP_BB_PCA9675_read_data(uint8_t Slave_Address, uint8_t *read_port0, uint8_t *read_port1)
+    {
+        sint32_t Ack_Status = 0;
+        sint8_t rx_array[2];                                                      /* Local reception array */
+
+        Ack_Status = CNTRL_I2C_Master_Mode_Receive(Slave_Address, rx_array, 2);   /* Receive two bytes */
+        *read_port0=rx_array[0];                                                  /* transfer data back to pointer */
+        *read_port1=rx_array[1];                                                  /* transfer data back to pointer */
+        return Ack_Status;
+    }        
+
+
+/* Read the switch position - either on or off */
+sint32_t RS_EDP_BB_Read_DIP_Switch(uint8_t Switch_Number, uint8_t *Switch_Status)
+    {
+        sint32_t Ack_Status = 0;
+        uint8_t port0 = 0;                                                        
+        uint8_t port1 = 0;
+        
+        Ack_Status = RSEDP_BB_PCA9675_read_data(PCA9675_BASE_BOARD, &port0, &port1);
+        
+        switch (Switch_Number)
+            {
+        
+            case 1:
+                if ((port0 & 0x01) == SWITCH_ON) 
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+
+            case 2:
+                if ((port0 & 0x02) == SWITCH_ON)
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+                                
+            case 3:
+                if ((port0 & 0x04) == SWITCH_ON)
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+                        
+            case 4:
+                if ((port0 & 0x08) == SWITCH_ON)
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+                
+            case 5:
+                if ((port0 & 0x10) == SWITCH_ON)
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+                
+            case 6:
+                if ((port0 & 0x20) == SWITCH_ON)
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+                
+            case 7:
+                if ((port0 & 0x40) == SWITCH_ON) 
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+                
+            case 8:
+                if ((port0 & 0x80) == SWITCH_ON) 
+                    {
+                        *Switch_Status = DIP_SWITCH_CLOSED;
+                    }
+                else{
+                        *Switch_Status = DIP_SWITCH_OPEN;
+                    }
+                break;
+                
+            default:
+                    {
+                        *Switch_Status = port0;
+                    }
+            }        
+        return Ack_Status;
+     }
+    
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