miniterm.py `udevserial -v ID_MODEL=Arduino_Due -v SUBSYSTEM=tty` 115200 --raw
esptool32 --port `udevserial -v ID_MODEL=Arduino_Due -v SUBSYSTEM=tty` --before no_reset --after no_reset --baud 115200 write_flash 0x10000 ~/devel/ESP32/esp-idf/examples/bluetooth/gatt_server/build/gatt_server_demos.bin
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Macchina M2-B Hacking Notes
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| #include <OBD2.h> | |
| #include <DueTimer.h> | |
| #include "SamNonDuePin.h" | |
| const int XB_nRST = X4; | |
| const int XB_GPIO0 = 29; // GPIO0 is on Pin 7 of XBee header and to PD6 of micro and mapped to pin 29 | |
| const int LED_YELLOW = X0; | |
| void setup() | |
| { | |
| SerialUSB.begin(234000); | |
| Serial.begin(115200); | |
| SerialUSB.println(printf("System Reset")); | |
| SerialUSB.println("> "); | |
| pinModeNonDue(XB_nRST, OUTPUT); | |
| pinMode(XB_GPIO0, OUTPUT); | |
| digitalWriteNonDue(XB_nRST, HIGH); | |
| digitalWrite(XB_GPIO0, HIGH); | |
| pinModeNonDue(LED_YELLOW, OUTPUT); | |
| digitalWriteNonDue(LED_YELLOW, LOW); | |
| } | |
| int doDelay = 0; | |
| bool toggleBootMode = false; | |
| bool passThrough = false; | |
| void loop() | |
| { | |
| if(doDelay > 0) { | |
| SerialUSB.print("Delay: "); | |
| SerialUSB.print(doDelay); | |
| delay(doDelay); | |
| SerialUSB.print(".\n> "); | |
| doDelay = 0; | |
| } | |
| if(toggleBootMode) { | |
| digitalWriteNonDue(XB_nRST, HIGH); | |
| toggleBootMode = false; | |
| } | |
| } | |
| bool led = 0; | |
| void serialEvent() { | |
| // 'activity' light | |
| digitalWriteNonDue(LED_YELLOW, led ? HIGH : LOW); | |
| led = led ? 0 : 1; | |
| // Serial data from XB_ can just be passed straight through | |
| while(Serial.available()) { | |
| SerialUSB.write((uint8_t)Serial.read()); | |
| } | |
| } | |
| void serialEventUSB() { | |
| // 'activity' light | |
| digitalWriteNonDue(LED_YELLOW, led ? HIGH : LOW); | |
| led = led ? 0 : 1; | |
| while(SerialUSB.available()) { | |
| uint8_t c = SerialUSB.read(); | |
| // if already in flash mode just write and stop | |
| if(passThrough) { | |
| Serial.write(c); | |
| return; | |
| } | |
| // proper data coming back from ESP32 can be passed back | |
| SerialUSB.write(c); | |
| // simple command set | |
| // b: enter boot mode | |
| // r: reset | |
| // both b and r lower nRST | |
| // and toggle bootmode (back up in 500ms) | |
| if(c == 'b' || c == 'r') { | |
| SerialUSB.println("\n\nReseting ESP32"); | |
| digitalWriteNonDue(XB_nRST, LOW); | |
| toggleBootMode = true; | |
| doDelay = 500; | |
| } | |
| // b also lowers GPIO0 and enables pass-through | |
| if(c == 'b') { | |
| Serial.begin(234000); | |
| digitalWrite(XB_GPIO0, LOW); | |
| passThrough = true; | |
| } else if(c == '\n') { | |
| SerialUSB.print("> "); | |
| } | |
| } | |
| } |
Flashing the ESP32 was the first thing needing attention. I wanted to be able to flash the device without removing it from the socket.
The plan. Put the ESP32 into flashmode via nRST GPIO0 toggling. Bring
both LOW then bring nRST back up. Then esptool32 can be coerced into
flashing the chip. There is still a bit of manual intervention but I got
it working.
Using mac32.ino send b over the USB serial port to enter bootmode.
> b
Reseting ESP32
Delay: 500.
> ets Jun 8 2016 00:22:57
rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
waiting for download
If using a serial terminal disconnect, there is nothing else to be done without resetting the M2.
Now you can start flashing the ESP32 with esptool32.
The differences from normal use are the inclusion of --before no_reset
and --after no_reset. You have to reset and re-enter bootmode for
each file being flashed, this is a shortcoming in the code at the moment.
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