wayne roberts / Mbed OS i2c_slave_block_example

example of i2c slave device supporting block transfers

Dependencies:   lib_i2c_slave_block

Tested on nucleo board as slave. Use with i2c_master_block_example on raspberry pi as master.

Master I2C write will print on serial terminal 115200. User button will raise an irq; the RPi test program will service the interrupt.

See lib_i2c_slave_block for explanation of code.

Diff: main.cpp

Revision:
2:d7e05c75f240
Parent:
0:3ccfaf358115
Child:
3:0288d257446a
--- a/main.cpp	Fri Jan 18 16:01:28 2019 -0800
+++ b/main.cpp	Mon Jan 21 18:09:05 2019 -0800
@@ -14,6 +14,7 @@
 
 DigitalIn button(USER_BUTTON);
 
+uint8_t test_buf[32];
 
 void fill_tx_buf(uint8_t cmd)
 {
@@ -30,6 +31,9 @@
                 i2c.tx_buf[i] = i + cnt;
             cnt++;
             break;
+        case CMD_BUFFER:
+            memcpy(i2c.tx_buf, test_buf, sizeof(test_buf));
+            break;
         case CMD_IRQ:
             for (i = 0; i < cmd_to_length[CMD_IRQ]; i++)
                 i2c.tx_buf[i] = irq.buf[i];
@@ -43,6 +47,12 @@
     }
 }
 
+bool cmd_allowed(uint8_t)
+{
+    /* return false if slave cannot take this cmd now */
+    return true;
+}
+
 void service_i2c_write(uint8_t cmd, uint8_t len, const uint8_t* req)
 {
     uint8_t s8;
@@ -57,8 +67,11 @@
                 pc.printf("%02x ", req[s8]);
             pc.printf("\r\n");
             break;
+        case CMD_BUFFER:
+            memcpy(test_buf, req, sizeof(test_buf));
+            break;
         default:
-            pc.printf("??%02x??|\r\n", cmd);
+            pc.printf("??%02x??\r\n", cmd);
             break;
     } // ..switch (cmd)
 }