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lib_i2c/examples/app_simple_asynchronous_master/src/simple_asynchronous_master.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(client i2c_master_async_if i2c, uint8_t target_device_addr);
+void my_application_handle_bus_error(i2c_res_t result);
+void my_application_fill_buffer(uint8_t buffer[]);
+
+// I2C interface ports
+port p_scl = XS1_PORT_1E;
+port p_sda = XS1_PORT_1F;
+
+#define BUFFER_BYTES 100
+
+int main(void) {
+  i2c_master_async_if i2c[1];
+  static const uint8_t target_device_addr = 0x3c;
+
+  par {
+    i2c_master_async(i2c, 1, p_scl, p_sda, 100, BUFFER_BYTES);
+    my_application(i2c[0], target_device_addr);
+  }
+  return 0;
+}
+
+void my_application(client i2c_master_async_if i2c, uint8_t target_device_addr) {
+  uint8_t buffer[BUFFER_BYTES];
+
+  // Create and send initial block of data
+  my_application_fill_buffer(buffer);
+  i2c.write(target_device_addr, buffer, BUFFER_BYTES, 1);
+
+  // Start computing the next block of data
+  my_application_fill_buffer(buffer);
+
+  while (1) {
+    select {
+      case i2c.operation_complete():
+        size_t num_bytes_sent;
+        i2c_res_t result = i2c.get_write_result(num_bytes_sent);
+        if (num_bytes_sent != BUFFER_BYTES) {
+           my_application_handle_bus_error(result);
+        }
+
+        // Offload the next data bytes to be sent
+        i2c.write(target_device_addr, buffer, BUFFER_BYTES, 1);
+
+        // Compute the next block of data
+        my_application_fill_buffer(buffer);
+
+        break;
+    }
+  }
+}
+
+void my_application_handle_bus_error(i2c_res_t result) {
+  // Ignore for now
+}
+
+void my_application_fill_buffer(uint8_t buffer[]) {
+  static int offset = 0;
+  for (int i = 0; i < BUFFER_BYTES; ++i) {
+    buffer[i] = i + offset;
+  }
+  offset += 1;
+}
+
+// end