General • Re: [overclocking] RP2350 at 700 MHz (PIO alone at 1560 MHz) with Flash, PSRAM, ARM, RISC-V, in C and Micropython

Code:

.program blink.wrap_target    set pins, 1   ; Turn LED on    nop[4]    nop[15]    set pins, 0   ; Turn LED off    nop[19].wrap             ; Blink forever!

Code:

void configure_clock() {    // Configure PLL system to 900 MHz vco and 75MHz clk_sys    pll_hw_t *pll = pll_sys;    uint refdiv = 1;    uint vco_freq = 900;    uint fbdiv = 75;    uint postdiv1 = 6;    uint postdiv2 = 2;        printf("configure_clock_1\n");    // This reconfigure clk_sys to run from the PLL_USB    // I do this, since I had problem using pll_init() later on if clk_sys is connected to pll_sys    clock_configure(clk_sys,        CLOCKS_CLK_SYS_CTRL_SRC_VALUE_CLKSRC_CLK_SYS_AUX,        CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_CLKSRC_PLL_USB,        48 * MHZ,        48 * MHZ    );    printf("configure_clock_2\n");    // This was added while I was following the example from the sdk,     // how to change the pll for the clk_sys.    // It is just in here to be on the save side and have working connection to the chip    clock_configure(clk_peri,        0,        CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLK_SYS,        48 * MHZ,        48 * MHZ    );    printf("2.5\n");    stdio_init_all();    // Deinits the pll_sys before turning it on again with the wanted config    pll_deinit(pll_sys);    printf("configure_clock_3\n");        // The * MHZ is needed! I tried it without it in different configuration and couldn't get it to work.     // Even with the correct number calculated and used directly.     // Anyway, this works at least for me and I guess I overlooked something in my other attempts.    pll_init(        pll_sys,       // PLL to configure        refdiv,             // REFDIV        900 * MHZ,            // FBDIV        postdiv1,             // PD1        postdiv2              // PD2    );        printf("configure_clock_4\n");    // Switch clk_sys back to use pll_sys    clock_configure(        clk_sys,        CLOCKS_CLK_SYS_CTRL_SRC_VALUE_CLKSRC_CLK_SYS_AUX,        CLOCKS_CLK_SYS_CTRL_AUXSRC_VALUE_CLKSRC_PLL_SYS,        75 * MHZ,  // source freq (crystal)        75 * MHZ  // target freq     );    printf("configure_clock_5\n");}

Code:

int main(){    stdio_init_all();    // For the connection to reestablish and setup    sleep_ms(2000);    // This is the setup for the GPIO LED    int rc = pico_led_init();    hard_assert(rc == PICO_OK);    // To visually check if the programm ist stared    pico_set_led(true);    // This starts the PIO code    PIO pio = pio0;    uint offset = pio_add_program(pio, &blink_program);    printf("Loaded program at %d\n", offset);    blink_pin_forever(pio, 0, offset, CLOCK_OUTPUT_PIN);    sleep_ms(1000);    // Setting the voltage to a range, where it should have no trouble running fast    vreg_set_voltage(VREG_VOLTAGE_2_35);    printf("Done setting voltage to %i\n", VREG_VOLTAGE_2_35);    sleep_ms(1000);    printf("pre_configure_clock\n");    // This calls the function posted above    configure_clock();     // This is a blinking countdown, which increases in frequency once it gets closer to the divider change.     // Just for a visual confirmation where the program is    for(int i = 0; i < 240; i++){        pico_set_led(true);        sleep_ms(1000);        pico_set_led(false);        sleep_ms(1000);    }      for(int i = 0; i < 600; i++){        pico_set_led(true);        sleep_ms(100);        pico_set_led(false);        sleep_ms(100);    }    // This configures the dividers directly and forces clk_sys to the frequency of the pll_sys VCO    set_sys_pll_deviders( 1, 1 );    while (true) {        pico_set_led(true);        sleep_ms(1000);        printf("ping\n");        pico_set_led(false);        sleep_ms(1000);    }}