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lib_i2c/examples/app_simple_slave/src/simple_slave.xc

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+// Copyright 2018-2021 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+
+/* A simple application example used for code snippets in the library
+ * documentation.
+ */
+
+#include <xs1.h>
+#include <stdio.h>
+#include "i2c.h"
+
+void my_application(server i2c_slave_callback_if i2c);
+
+// I2C interface ports
+port p_scl = XS1_PORT_1E;
+port p_sda = XS1_PORT_1F;
+
+int main(void) {
+  static const uint8_t device_addr = 0x3c;
+  i2c_slave_callback_if i2c;
+
+  par {
+    i2c_slave(i2c, p_scl, p_sda, device_addr);
+    my_application(i2c);
+  }
+
+  return 0;
+}
+
+void my_application(server i2c_slave_callback_if i2c) {
+  while (1) {
+    select {
+    case i2c.ack_read_request() -> i2c_slave_ack_t response:
+      response = I2C_SLAVE_ACK;
+      break;
+    case i2c.ack_write_request() -> i2c_slave_ack_t response:
+      response = I2C_SLAVE_ACK;
+      break;
+    case i2c.master_sent_data(uint8_t data) -> i2c_slave_ack_t response:
+      // handle write to device here, set response to NACK for the
+      // last byte of data in the transaction.
+      break;
+    case i2c.master_requires_data() -> uint8_t data:
+      // handle read from device here
+      break;
+    case i2c.stop_bit():
+      break;
+    }
+  }
+}
+
+// end