nerdralph

#include <stdint.h>

extern __flash const uint8_t digital_pin_to_bit_mask_PGM[];

uint8_t read_array(uint8_t i)
{
  return digital_pin_to_bit_mask_PGM[i];        // bug: uses ld
  // return *(digital_pin_to_bit_mask_PGM + i);    // uses lpm
}

nerdralph

sudo ./openocd -f ~/devel/dap/cmsis-dap.cfg 
xPack OpenOCD, x86_64 Open On-Chip Debugger 0.10.0+dev (2020-10-13-17:27)
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
Info : CMSIS-DAP: SWD  Supported
Info : CMSIS-DAP: FW Version = 1.0.0
Info : CMSIS-DAP: Interface Initialised (SWD)
Info : SWCLK/TCK = 1 SWDIO/TMS = 1 TDI = 0 TDO = 0 nTRST = 0 nRESET = 1
Info : CMSIS-DAP: Interface ready

nerdralph

// Ralph Doncaster 2020 public domain software
// calculate the 64-bit inverse of odd integers
#include <stdio.h>
#include <stdint.h>

#define END_RANGE 9999

int main()
{
    uint64_t neg1 = (uint64_t) -1LL;

nerdralph

// Ralph Doncaster 2020 public domain software
// generate lookup table for powers of sqrt(2)
#include <stdio.h>
#include <math.h>

int main()
{
    double sqrt2 = sqrt(2.0);
    for (double d = 2; d <= 16; d += 1) {
        printf( "1.414^%d = %lf\n", (int)d, pow(sqrt2, d) );

nerdralph

/* Fridge Door Alarm for the ATTiny13[A]
 *
 * Functionality:
 *
 * Door opens, door open chime.
 * After 60 seconds, door-open warning beep.
 * If door still open, warning beeps every 30 seconds.
 * After 5 minutes, continous alarm signal.
 * Door closes, door close chime.
 * If Silent Running pressed, no door chimes for ONE operation.

nerdralph

/*
  ATtiny13 internal oscillator tuner

  By Ralph Doncaster (2019)
  Tweaked and tuned by MCUdude
  ------------------------------------------------------------------------------

  [ See diagram: https://github.com/MCUdude/MicroCore#minimal-setup ]

  Tunes the internal oscillator using a software serial implementation

nerdralph

/* ssd1306 test for picoI2C
 * Ralph Doncaster (c) 2019
 * free software - MIT license
 */

#include <stdint.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "picoI2C.h"

nerdralph

// t13 OSCCAL tuner
// Ralph Doncaster 2019 public domain software
// repeatedly press 'x' until OSCCAL value stabilizes
// output value is timing delta in cycles followed by OSCCAL

#define BAUD_RATE 115200
#include <BBUart.h>
#include <avr/sleep.h>

#define UART_RX 1

nerdralph

// blink LED using sleep and millis() on MicroCore
// 2019 Ralph Doncaster freeware

#define LEDPIN 0

#include <avr/sleep.h>

static void sleep_ms(unsigned ms) {
  ms -= 9; // 1/2 millis minimum increment in MicroCore
  unsigned snapshot = (unsigned)millis();

nerdralph

/* 2018 Ralph Doncaster public domain software */
/* spew a char to stdout, null if none provided */

#include <unistd.h>
#include <string.h>

int main(int argc, char** argv){
    char buf[1024];
    char c = 0;
    if( argc > 1 ) c = *argv[1];