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Wolfgang Hottgenroth
2024-03-14 11:07:10 +01:00
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## Debugging
```
mspdebug rf2500 gdb
msp430-gdb -x firmware.gdb
```
Attention: the gdb in the TI toolchain package is broken, use the one from Debian
## Signals Working Cycler
These signals are related to code under tag `cycler_works_include_output_stage`.
First octets:
![](./docs/cycler_working_first_octets.png)
Last octets:
![](./docs/cycler_working_last_octets.png)
Schematics and legend for signals:
![](./docs/schematics.jpeg)
## Timing
Complete cycle: 2.48us
![](./docs/pulse_complete.png)
Short pulse: 550ns
![](./docs/pulse_short.png)
Long pulse: 1.18us
![](./docs/pulse_long.png)
## Load Time
During of loading data into five LEDs: 297us
![](./docs/five_leds.png)
During of loading data into six LEDs: 297us
![](./docs/six_leds.png)
| # of LEDs | Load Time measured | calculated |
| --------- | ------------------ | ---------- |
| 5 | 297us | |
| 6 | 354us | 356.4us |
| 10 | | 594us |
| 100 | | 5.9ms |
| 200 | | 11.8ms |
## Reset Circuitry
It appears that the output voltage of the power supply raises that slow, that the MCU
will not handle the reset correctly.
The following circuitry should generate a valid reset signal far enough from the raise
of the supply voltage:
![](./docs/reset-circuit.jpeg)
The circuit generates the following signals:
![](./docs/reset-signal.png)
#### Reference voltage (green):
```math
U_ref = 3.3V \frac{22k\Omega}{22k\Omega + 10k\Omega} = 2.2V
```
#### Trigger voltage (purple):
```math
U_trigg = 3.3V \frac{330k\Omega}{330k\Omega + 82k\Omega} = 2.64V
```
#### RC constant:
```math
\tau = 82k\Omega \cdot 100nF = 8.2ms
```