// file: pico.c
// author: KLL
/*
*
*
*/


/*
* CMakeLists.txt // _____________________________ please make this file in your 'project' directory with following content:

cmake_minimum_required(VERSION 3.12)

#include(pico_sdk_import.cmake)
include(~/pico/pico-sdk/external/pico_sdk_import.cmake)

project(project)

pico_sdk_init()

# cross compile a c++ code for the Raspberry Pi PICO RP2040 cpu
add_executable(pico pico.c)

# Pull in our pico_stdlib which pulls in commonly used features
target_link_libraries(pico pico_stdlib )

# enable usb output, disable uart output
pico_enable_stdio_usb(pico 1)
pico_enable_stdio_uart(pico 0)

# create map/bin/hex/uf2 file etc.
pico_add_extra_outputs(pico)

*/

#include <stdio.h>
#include "pico/stdlib.h"

bool DIAG = true; //false; //____________________ code testing print enable
//_______________________________________________ pre compiler text macro: replace all 'dp' with 'if(DIAG) printf'
#define dp if(DIAG) printf

// LED
const uint LED_PIN = 25;
bool LED_stat = false;

void LED_toggle() {
    LED_stat = !LED_stat; //_____________________ toggle
    if ( LED_stat ) {
        gpio_put(LED_PIN, 1);
        dp(" LED ON \n");
    } else {
        gpio_put(LED_PIN, 0);
        dp(" LED OFF\n");
    }
}

int ser0() { //__________________________________ check for operator input / not in every loop
    int c_usb = getchar_timeout_us(0); //________ OPERATION
    switch(c_usb) {
        case 'd': //_____________________________ toggle print debug info
            DIAG = !DIAG;
            if (DIAG)  printf("diag print enabled, press 'd'\n");
            if (!DIAG) printf("diag print disabled, press 'd'\n");
            break;
        default:
            ;//printf("what was that?");
    }
}

int loop=0; //___________________________________ Mloop variables
uint64_t omicros=0,nmicros=0;

int reportMloop() { //___________________________ Time for 1 Million loops
    loop++;
    if ( loop >= 1000000 ) {
        loop = 0;
        nmicros = time_us_64();
        dp("Mloop: %0.1f ms \n",(nmicros-omicros)/1000.0);
        omicros = nmicros;
        LED_toggle(); //_________________________ BLINK on board LED
        ser0(); //_______________________________ check on OPERATOR ( USB input 'd' )
    }
}

int setup() {
    stdio_init_all();
    gpio_init(LED_PIN);
    gpio_set_dir(LED_PIN, GPIO_OUT);
    dp("i am PICO"); //__________________________ never see this one
    //___________________________________________ here should be your USER SETUP
}

int main() {
    setup(); //__________________________________ SETUP

    while (1) { //_______________________________ LOOP
        reportMloop(); //________________________ prints: Mloop: 194.0 ms
        //_______________________________________ here should be your USER CODE
    }
}

// ______________________________________________ END