adafruit-mirror/arduino-pico
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Reboot using Arduino standard 1200bps/DTR=0

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Allow the IDE to cause the chip to reboot when the Serial port is active
and the baud is set to 1200 followed by a DTR toggle.  The user still
needs to hold the BOOTSEL button to enable the UF2 boot, for now.
This commit is contained in:
Earle F. Philhower, III 2021-02-26 18:31:15 -08:00
parent ded383ed42
commit e0e0d9e115
2 changed files with 25 additions and 1 deletions
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2
README.md
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@ -5,7 +5,7 @@ This is an under-development port of the RP2040 (Raspberry Pi Pico processor) to
It uses a custom toolset with GCC 10.2 and Newlib 4.0.0, not depending on system-installed prerequisites. https://github.com/earlephilhower/pico-quick-toolchain
Only delay, analogWrite, and digitalWrite are implemented now. The biggest hurdle was getting a working build system outside of the pick-sdk CMake environment.
The biggest hurdle was getting a working build system outside of the pick-sdk CMake environment.
Presently, a manually build `pico.a` file is generated using objects compiled by `cmake` in the pico-examples repo, but in the future this will be scripted and automated.
There is automated discovery of boards in bootloader mode, so they show up in the IDE, and the upload command works using the Microsoft UF2 tool (included).

24
cores/rp2040/SerialUSB.cpp
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@ -7,6 +7,7 @@ extern "C" {
#include "pico/binary_info.h"
#include "hardware/irq.h"
#include "pico/mutex.h"
#include "hardware/watchdog.h"
}
#define PICO_STDIO_USB_TASK_INTERVAL_US 1000
#define PICO_STDIO_USB_LOW_PRIORITY_IRQ 31
@ -220,3 +221,26 @@ SerialUSB::operator bool() {
return ret;
}
static bool _dtr = false;
static bool _rts = false;
static int _bps = 115200;
static void CheckSerialReset() {
if ((_bps == 1200) && (!_dtr)) {
watchdog_enable(100, 1);
while (1); // WDT will fire here
}
}
extern "C" void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {
_dtr = dtr ? true : false;
_rts = rts ? true : false;
CheckSerialReset();
}
extern "C" void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* p_line_coding) {
_bps = p_line_coding->bit_rate;
CheckSerialReset();
}