Diff: main.cpp

Revision:

28:f86ec29d719c

Parent:

27:6e67717398b6

--- a/main.cpp	Fri Aug 14 04:08:46 2020 +0000
+++ b/main.cpp	Wed Dec 29 07:01:43 2021 +0000
@@ -1,3 +1,9 @@
+// This program is for interacting with the MAX20361 (AO31)
+// The PMIC registers: I2C address 0x50/0x51
+// The Haptic driver registers: I2C address 0xA0/0xA1
+// The MAX17260 m5 Fuel Gauge: I2C address 0x6C/0x6D. The register's length is 16 bits.
+
+
 #include "mbed.h"
 #include "USBSerial.h"
 
@@ -83,7 +89,7 @@
 }
 
 // *****************************************************************************
-//   I2C_read_register(char, char, char *, int)  writes single byte to OT07
+//   I2C_read_register(char, char, char *, int)  reads byte(s) from OT07
 //                       char   I2C address
 //                       char   OT07 register address
 //                       char * data vector for read bytes to be stored in 
@@ -102,8 +108,6 @@
 
 int I2C_read(char I2C_add, char *bytes, int n) {
     int error;
-    
-//    error = i2c.write(I2C_add, 0, 0, 1);
 
     i2c.start();            // create a start bit
     error = i2c.write(I2C_add);
@@ -127,39 +131,33 @@
 // *****************************************************************************
 void process_command(char rx_buff[128])
 {
-    char data[130];
+    char data[130];         // for storing read results
+    char wdata[10];         // for storing write bytes
     int i;
     int num_bytes;
     char c;
     int arg1 = 0;
     int arg2 = 0;
     int arg3 = 0;
-    int n = sscanf(rx_buff, " %c %x %x %x", &c, &arg1, &arg2, &arg3);
+    int arg4 = 0;
+//    int n = sscanf(rx_buff, " %c %x %x %x", &c, &arg1, &arg2, &arg3);
+    int n = sscanf(rx_buff, " %c %x %x %x %x", &c, &arg1, &arg2, &arg3, &arg4);
     //process input
     if (n > 0) {//got input so process it
         switch (c) 
         {
             case 'r':
             case 'R':
-                  //read register "r slave.add radd.start radd.end"                                      
-                if (n == 2) {   //read device 
+                  //read register "r slave.add"                                      
+                if (n == 2) {    
                     int error = I2C_read(arg1, data, 2);
                     if (error)
                         pc.printf("nack\r\n");
                     else
                         pc.printf("%02X %02X\r\n", data[0], data[1]);
-                   
-                   // use PICO AIN0 to cross check
-                   //nalogIn   ain(AIN_0);
-//                   int samples[5];
-//                   for (int i = 0; i < 5; i++) {
-//                        samples[i] = ain.read_u16(); 
-//                        pc.printf("Attempt %d is: %d \r\n", i, samples[i]);     
-//                    }
-//                    pc.printf("Average is: %d \r\n", (samples[0] + samples[1] + samples[2] + samples[3] + samples[4]) / 5);
                 }
                 
-                //read register "r slave.add radd.start radd.end"                                      
+                //read register "r slave.add radd"                                      
                 if (n == 3) {   //read single register from selected device
                     int error = I2C_read_register(arg1, arg2, data, 1);
                     if (error)
@@ -167,7 +165,9 @@
                     else
                         pc.printf("%02X\r\n", data[0]);
                 }
-                if (n == 4) {   //read a range of regesters from selected device 
+                
+                //read register "r slave.add radd.start radd.end"  
+                if (n == 4) {   //read a range of registers from selected device 
                     num_bytes = arg3 - arg2 + 1;// calculate number of bytes to read
                     if (num_bytes < 1) num_bytes = 1;// if arg2 <= arg 1 just read arg1 address.                                      
                     I2C_read_register(arg1, arg2, data, num_bytes);
@@ -175,14 +175,39 @@
                         pc.printf("%02X\r\n", data[i]);
                     }
                 }
+                
+                //read m5 fuel gauge register "r slave.add radd 2 5" 
+                if (n == 5) {
+                    I2C_read_register(arg1, arg2, data, 2);
+//                    pc.printf("m5\r\n");
+                    pc.printf("%02X%02X\r\n", data[1], data[0]);
+                }
+                
                 break;
             case 'w':
-            case 'W':   //write register "w device w.addr data"
-                int error = I2C_write_register(arg1, arg2, arg3);
-                if (error)
-                    pc.printf("nack\r\n");
-                else
-                    pc.printf("ack\r\n");
+            case 'W':   
+            
+                //write register "w device w.addr data"
+                if (n == 4) {
+                    int error = I2C_write_register(arg1, arg2, arg3); //int I2C_write_register(char I2C_add, char reg_add, char byte)
+                    if (error)
+                        pc.printf("nack\r\n");
+                    else
+                        pc.printf("ack\r\n");
+                }
+                
+                //write m5 fuel gauge register "w device w.addr data.upperbyte data.lowerbyte"
+                if (n == 5) {
+                    wdata[0] = arg4;
+                    wdata[1] = arg3;
+//                     pc.printf("%02X%02X\r\n", wdata[1], wdata[0]);
+                    int error = I2C_write_register(arg1, arg2, wdata, 2); // I2C_write_register(char I2C_add, char reg_add, char *bytes, int n)
+                    if (error)
+                        pc.printf("nack\r\n");
+                    else
+                        pc.printf("ack\r\n");
+                }
+                
                 break;
         }//end switch(c)
     }