data_logger: add data_logger_flush

include/infuse/data_logger/logger.h

@@ -146,6 +146,21 @@ int data_logger_block_read(const struct device *dev, uint32_t block_idx, uint16_
 int data_logger_erase(const struct device *dev, bool erase_all,
 		      void (*erase_progress)(uint32_t blocks_erased));
 
+/**
+ * @brief Flush any data pending in a RAM buffer to the backend
+ *
+ * This function only performs useful work on data loggers with an attached
+ * RAM buffer.
+ *
+ * @param dev Data logger to flush
+ *
+ * @retval 0 on success
+ * @retval -ENOTCONN data logger is currently disconnected
+ * @retval -ENOMEM data logger is full
+ * @retval -errno on error
+ */
+int data_logger_flush(const struct device *dev);
+
 #ifdef CONFIG_ZTEST
 
 /**

subsys/data_logger/backends/shim.c

@@ -83,12 +83,13 @@ int logger_shim_init(const struct device *dev)
 {
 	const struct dl_shim_config *config = dev->config;
 	struct dl_shim_data *data = dev->data;
+	int rc;
 
 	/* Setup common data structure */
 	data->common.physical_blocks = config->physical_blocks;
 	data->common.logical_blocks = config->physical_blocks * 2;
 	data->common.block_size = 512;
-	data->common.erase_size = 512;
+	data->common.erase_size = 1024;
 	data->common.erase_val = 0xFF;
 
 	/* Reset state */
@@ -104,7 +105,11 @@ int logger_shim_init(const struct device *dev)
 	data->func.reset.block_until = NULL;
 
 	/* Common init function */
-	return data_logger_common_init(dev);
+	rc = data_logger_common_init(dev);
+
+	/* Common init does a number of read calls */
+	data->func.read.num_calls = 0;
+	return rc;
 }
 
 struct data_logger_shim_function_data *