zpu: Add functions to read/write TCXO DAC calibration from EEPROM.

zpu/lib/eeprom.c

@@ -1,5 +1,6 @@
 /*
  * Copyright 2007 Free Software Foundation, Inc.
+ * Copyright 2017 Alexander Chemeris <Alexander.Chemeris@fairwaves.co>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -22,6 +23,8 @@
 
 static const int EEPROM_PAGESIZE = 16;
 
+#define EEPROM_TCXO_DAC_OFFSET (0xFF-3)
+
 bool find_safe_booted_flag(void) {
 #ifdef NO_EEPROM
 	return 0;
@@ -91,3 +94,18 @@ eeprom_read (int i2c_addr, int eeprom_offset, void *buf, int len)
   return true;
 }
 #endif
+
+uint16_t
+eeprom_read_tcxo_dac()
+{
+  uint16_t val;
+  eeprom_read(USRP2_I2C_ADDR_MBOARD, EEPROM_TCXO_DAC_OFFSET, &val, 2);
+  return (val>>8)+(val<<8);
+}
+
+bool
+eeprom_write_tcxo_dac(uint16_t tcxo_dac)
+{
+  uint16_t val = (tcxo_dac>>8)+(tcxo_dac<<8);
+  return eeprom_write(USRP2_I2C_ADDR_MBOARD, EEPROM_TCXO_DAC_OFFSET, &val, 2);
+}

zpu/lib/eeprom.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 Alexander Chemeris <Alexander.Chemeris@fairwaves.co>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef INCLUDED_EEPROM_H
+#define INCLUDED_EEPROM_H
+
+/* Safe booted or not? (read from EEPROM) */
+bool find_safe_booted_flag(void);
+
+/* Store safe booted flag to EEPROM */
+void set_safe_booted_flag(bool flag);
+
+/* Write to EEPROM */
+bool eeprom_write(int i2c_addr, int eeprom_offset, const void *buf, int len);
+
+/* Read from EEPROM */
+bool eeprom_read(int i2c_addr, int eeprom_offset, void *buf, int len);
+
+/* Read TCXO DAC calibrtion value from EEPROM */
+uint16_t eeprom_read_tcxo_dac();
+
+/* Write TCXO DAC calibrtion value to EEPROM */
+bool eeprom_write_tcxo_dac(uint16_t tcxo_dac);
+
+#endif /* INCLUDED_EEPROM_H */