e320: Fix front panel gpio to support 3.3V

- E320 will support only 3.3 V for the front panel GPIO
- Remove other voltage options

2 files changed, 19 insertions, 22 deletions

diff --git a/mpm/python/usrp_mpm/periph_manager/e320.py b/mpm/python/usrp_mpm/periph_manager/e320.py
index 461527f59..2ed726bc9 100644
--- a/mpm/python/usrp_mpm/periph_manager/e320.py
+++ b/mpm/python/usrp_mpm/periph_manager/e320.py
@@ -31,7 +31,7 @@ E320_DEFAULT_EXT_CLOCK_FREQ = 10e6
 E320_DEFAULT_CLOCK_SOURCE = 'internal'
 E320_DEFAULT_TIME_SOURCE = 'internal'
 E320_DEFAULT_ENABLE_GPS = True
-E320_DEFAULT_FPGPIO_VOLTAGE = 0
+E320_DEFAULT_ENABLE_FPGPIO = True
 E320_FPGA_COMPAT = (3, 0)
 E320_MONITOR_THREAD_INTERVAL = 1.0 # seconds  # TODO Verify this
 E320_DBOARD_SLOT_IDX = 0
@@ -264,9 +264,9 @@ class e320(ZynqComponents, PeriphManagerBase):
             )
         )
         self.enable_fp_gpio(
-            voltage=args.get(
-                        'fp_gpio_voltage',
-                        E320_DEFAULT_FPGPIO_VOLTAGE
+            enable=args.get(
+                        'enable_fp_gpio',
+                        E320_DEFAULT_ENABLE_FPGPIO
                     )
         )
         # Init clocking
@@ -560,19 +560,19 @@ class e320(ZynqComponents, PeriphManagerBase):
         """
         self.mboard_regs_control.enable_gps(enable)
 
-    def enable_fp_gpio(self, voltage):
+    def enable_fp_gpio(self, enable):
         """
         Turn power to the front panel GPIO off or on and set voltage
-        to (1.8, 2.5, 3.3V) and setting to 0 turns off GPIO.
+        to 3.3V.
         """
         self.log.trace("{} power to front-panel GPIO".format(
-            "Enabling" if voltage == 0 else "Disabling"
+            "Enabling" if enable else "Disabling"
         ))
-        self.mboard_regs_control.enable_fp_gpio(voltage)
+        self.mboard_regs_control.enable_fp_gpio(enable)
 
     def set_fp_gpio_voltage(self, value):
         """
-        Set Front Panel GPIO voltage (1.8, 2.5 or 3.3 Volts)
+        Set Front Panel GPIO voltage (3.3 Volts)
         """
         self.log.trace("Setting front-panel GPIO voltage to {:3.1f} V".format(value))
         self.mboard_regs_control.set_fp_gpio_voltage(value)
diff --git a/mpm/python/usrp_mpm/periph_manager/e320_periphs.py b/mpm/python/usrp_mpm/periph_manager/e320_periphs.py
index eab96a483..4a5ee236a 100644
--- a/mpm/python/usrp_mpm/periph_manager/e320_periphs.py
+++ b/mpm/python/usrp_mpm/periph_manager/e320_periphs.py
@@ -8,6 +8,7 @@ E320 peripherals
 """
 
 import datetime
+import math
 from usrp_mpm.sys_utils.sysfs_gpio import SysFSGPIO, GPIOBank
 from usrp_mpm.sys_utils.uio import UIO
 
@@ -120,16 +121,11 @@ class MboardRegsControl(object):
         major = (compat_number>>16) & 0xff
         return (major, minor)
 
-    def enable_fp_gpio(self, value):
+    def enable_fp_gpio(self, enable):
         """ Enable front panel GPIO buffers and power supply
-        and set voltage 1.8, 2.5 or 3.3 V
-        Setting value to 0 would disable gpio
+        and set voltage 3.3 V
         """
-        if value == 0:
-            enable = False
-        else:
-            enable = True
-            self.set_fp_gpio_voltage(value)
+        self.set_fp_gpio_voltage(3.3)
         mask = 0xFFFFFFFF ^ ((0b1 << self.MB_GPIO_CTRL_BUFFER_OE_N) | \
                              (0b1 << self.MB_GPIO_CTRL_EN_VAR_SUPPLY))
         with self.regs:
@@ -147,14 +143,15 @@ class MboardRegsControl(object):
          0   1  | 2.5 V
          1   0  | 3.3 V
         Arguments:
-            value : 1.8, 2.5 or 3.3
+            value : 3.3
         """
-        assert value in (1.8, 2.5, 3.3)
-        if value == 1.8:
+        assert any([math.isclose(value, nn, abs_tol=0.1) for nn in (3.3,)]),\
+            "FP GPIO currently only supports 3.3V"
+        if math.isclose(value, 1.8, abs_tol=0.1):
             voltage_reg = 0
-        elif value == 2.5:
+        elif math.isclose(value, 2.5, abs_tol=0.1):
             voltage_reg = 1
-        elif value == 3.3:
+        elif math.isclose(value, 3.3, abs_tol=0.1):
             voltage_reg = 2
         mask = 0xFFFFFFFF ^ ((0b1 << self.MB_GPIO_CTRL_EN_3V3) | \
                              (0b1 << self.MB_GPIO_CTRL_EN_2V5))