Merge pull request #74 from jonnor/puya-py32f0-port

porting: Add log for Puya PY32F0xx

doc/porting/port_PY32F0.md

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+
+# Port TinyMaix to Puya PY32F0
+
+The tested device was a PY32F003x6.
+This is practically identical to PY32F002A, PY32F030.
+
+Note that some devices in this family has only 2kB RAM / 16 kB FLASH, which might not be sufficient.
+
+## Chip
+
+| Item  | Parameter              |
+| ----- | ---------------------- |
+| Chip  | PY32F003x6             |
+| Arch  | ARM Cortex M0          |
+| Freq  | 24M                    |
+| Flash | 32KB                   |
+| RAM   | 4KB                    |
+
+## Board
+
+"PY32F003F18P EVB" development board,
+
+Using a no-name "DAPLink" programmer.
+
+<a href="assets/PY32F003F18P-EVB.png"><img width=300 src="assets/PY32F003F18P-EVB.png"/></a>
+
+## Development Environment
+
+[IOsetting/py32f0-template](https://github.com/IOsetting/py32f0-template).
+Used `arm-none-eabi-gcc` version `13.2.0`.
+This SDK can also be used for Puya PY32F07x devices.
+
+## Step/Project
+
+Edited `tm_port.h` to have the following configuration.
+
+```
+#define TM_ARCH         TM_ARCH_CPU
+#define TM_OPT_LEVEL    TM_OPT0
+#define TM_MDL_TYPE     TM_MDL_INT8
+#define TM_FASTSCALE    (1)        
+#define TM_LOCAL_MATH   (0)         
+```
+
+Project can be found in https://github.com/jonnor/py32f0-template/tree/tinymaix-mnist
+
+`TM_OPT1` failed with undefined references to `tml_conv2d_dwconv2d` etc.
+
+## Result
+
+Used the "Arduino" MNIST model.
+Times are in milliseconds.
+
+| config | mnist | Note |
+| ------ | ----- | ---- |
+| O0 CPU | 44    |      |
+
+Memory usage:
+
+```
+Memory region         Used Size  Region Size  %age Used
+             RAM:        2104 B         4 KB     51.37%
+           FLASH:       25032 B        32 KB     76.39%
+```
+
+### **Author**
+
+Jon Nordby ([jonnor](https://github.com/jonnor)).