Low power variant supports Pyboard D.

Author: peterhinch

FASTPOLL.md

@@ -19,7 +19,8 @@ This version has the following features relative to official V2.0:
  whereby bidirectional devices such as UARTS can fail to handle concurrent
  input and output is fixed.
  * It is compatible with `rtc_time.py` for micro-power applications documented
- [here](./lowpower/README.md).
+ [here](./lowpower/README.md). This is a Pyboard-only extension (including
+ Pyboard D).
  * An assertion failure is produced if `create_task` or `run_until_complete`
  is called with a generator function
  [PR292](https://github.com/micropython/micropython-lib/pull/292). This traps

README.md

@@ -13,7 +13,7 @@ This comprises two parts.
  replacement for the official version providing bug fixes, additional
  functionality and, in certain respects, higher performance.
  2. An optional extension module enabling the [fast_io](./FASTPOLL.md) version
- to run with very low power draw.
+ to run with very low power draw. This is Pyboard-only including Pyboard D.
 
 ## Resources for users of all versions
 

lowpower/README.md

@@ -1,6 +1,6 @@
-# A low power usayncio adaptation
+# A low power usayncio adaptation for Pyboards
 
-Release 0.11 8th April 2019
+Release 0.11 9th April 2019
 
 API change: low power applications must now import `rtc_time_cfg` and set its
 `enabled` flag.  
@@ -15,8 +15,9 @@ Now supports Pyboard D.
    3.2.1 [Consequences of stop mode](./README.md#321-consequences-of-stop-mode)  
     3.2.1.1 [Timing Accuracy and rollover](./README.md#3211-timing-accuracy-and-rollover)  
     3.2.1.2 [USB](./README.md#3212-usb)  
-   3.2.2 [Measured results](./README.md#322-measured-results)  
-   3.2.3 [Current waveforms](./README.md#323-current-waveforms)  
+   3.2.2 [Measured results Pyboard 1](./README.md#322-measured-results-pyboard-1)  
+   3.2.3 [Current waveforms Pyboard 1](./README.md#323-current-waveforms-pyboard-1)  
+   3.2.4 [Pyboard D measurements](./README.md#324-pyboard-d-measurements)  
  4. [The rtc_time module](./README.md#4-the-rtc_time-module)  
  5. [Application design](./README.md#5-application-design)  
   5.1 [Hardware](./README.md#51-hardware)  
@@ -190,7 +191,7 @@ adaptor.
 
 ###### [Contents](./README.md#a-low-power-usayncio-adaptation)
 
-### 3.2.2 Measured results
+### 3.2.2 Measured results Pyboard 1
 
 The `lpdemo.py` script consumes a mean current of 980μA with 100ms latency, and
 730μA with 200ms latency, while awaiting a button press.
@@ -219,7 +220,7 @@ A data logging application might tolerate latencies of many seconds while
 waiting for a long delay to expire: getting close to `ib` may be practicable
 for such applications during their waiting period.
 
-### 3.2.3 Current waveforms
+### 3.2.3 Current waveforms Pyboard 1
 
 Running `lpdemo.py` while it waits for a button press with latency = 200ms.  
 It consumes 380μA except for brief peaks while polling the switch.  
@@ -233,6 +234,13 @@ Vertical 20mA/div
 Horizontal 500μs/div  
 ![Image](./current1.png)  
 
+### 3.2.4 Pyboard D measurements
+
+As of this release the two demo applications consume around 3.3mA. This is high
+because the unused pins are floating. When I discover which pins can be set to
+input with pullups as per the Pyboard 1.x implementation I hope to see figures
+comparable to Pyboard 1.x.
+
 ###### [Contents](./README.md#a-low-power-usayncio-adaptation)
 
 # 4. The rtc_time module

lowpower/lp_uart.py

@@ -13,7 +13,7 @@
 
 import uasyncio as asyncio
 try:
-    if asyncio.version != 'fast_io':
+    if asyncio.version[0] != 'fast_io':
         raise AttributeError
 except AttributeError:
     raise OSError('This requires fast_io fork of uasyncio.')

lowpower/rtc_time.py

@@ -45,6 +45,8 @@
 # Note the 4K7 I2C pullups on X9 X10 Y9 Y10.
 if d_series:
     print('Running on Pyboard D')  # Investigate which pins we can do this to TODO
+    #for pin in [p for p in dir(pyb.Pin.board) if p[0] in 'XYW']:
+        #pin_x = pyb.Pin(pin, pyb.Pin.IN, pyb.Pin.PULL_UP)
 else:
     print('Running on Pyboard 1.x')
     for pin in [p for p in dir(pyb.Pin.board) if p[0] in 'XY']: