40-pin gpio connect
gpio22-27 Alternative Function Assignments all are ALT4.
connect following gpio pin to jlink pin.
| 管脚名字 | gpio功能ALT4 |
|---|---|
| GPIO22 | ARM_TRST |
| GPIO23 | ARM_RTCK |
| GPIO24 | ARM_TDO |
| GPIO25 | ARM_TCK |
| GPIO26 | ARM_TDI |
| GPIO27 | ARM_TMS |
| GPIO01 | Vref |
| GPIO09 | GND |
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Raspi3 Raspi4 jtag debug
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