Some more fixes to longer lf recordings. Now also supports longer snoops, and an additional command 'lf config' has been defined, instead of having to specify all params for every call

armsrc/lfsampling.h

@@ -0,0 +1,59 @@
+#ifndef LFSAMPLING_H
+#define LFSAMPLING_H
+
+/**
+* Initializes the FPGA for reader-mode (field on), and acquires the samples.
+* @return number of bits sampled
+**/
+uint32_t SampleLF();
+
+/**
+* Initializes the FPGA for snoop-mode (field off), and acquires the samples.
+* @return number of bits sampled
+**/
+
+uint32_t SnoopLF();
+
+/**
+ * @brief Does sample acquisition, ignoring the config values set in the sample_config.
+ * This method is typically used by tag-specific readers who just wants to read the samples
+ * the normal way
+ * @param trigger_threshold
+ * @param silent
+ * @return number of bits sampled
+ */
+uint32_t DoAcquisition_default(int trigger_threshold, bool silent);
+/**
+ * @brief Does sample acquisition, using the config values set in the sample_config.
+ * @param trigger_threshold
+ * @param silent
+ * @return number of bits sampled
+ */
+
+uint32_t DoAcquisition_config( bool silent);
+
+/**
+* Setup the FPGA to listen for samples. This method downloads the FPGA bitstream
+* if not already loaded, sets divisor and starts up the antenna.
+* @param divisor : 1, 88> 255 or negative ==> 134.8 KHz
+* 				   0 or 95 ==> 125 KHz
+*
+**/
+void LFSetupFPGAForADC(int divisor, bool lf_field);
+
+
+/**
+ * Called from the USB-handler to set the sampling configuration
+ * The sampling config is used for std reading and snooping.
+ *
+ * Other functions may read samples and ignore the sampling config,
+ * such as functions to read the UID from a prox tag or similar.
+ *
+ * Values set to '0' implies no change (except for averaging)
+ * @brief setSamplingConfig
+ * @param sc
+ */
+void setSamplingConfig(sample_config *sc);
+
+sample_config * getSamplingConfig();
+#endif // LFSAMPLING_H