esp32c3 change cpu_clock_src

[BugSimpson]

hello @all,

i try to change the cpu clock source (by manipulating registers) and read the
( SYSTEM_SYSCLK_CONF_REG & SYSTEM_CLK_XTAL_FREQ_bm ) xtal frequency, i become everytime 40mhz.
it will be not change -.-*

i try to change like this ->

Code: Untitled.c Select all

void app_main(void)

{

    sys_set_cpu_clock_frequency(CPU_CLK_SRC_PLL_CLK_3);



    while (1)

    { 

      spi_write_dword( sys_get_xtal_clk_freq() );

      spi_write_dword( sys_get_soc_clk_sel() );

      spi_write_dword( sys_get_pll_clock_frequency() );

      spi_write_dword( sys_get_cpu_period_select() );

    } 

}

Code: Untitled.c Select all

void sys_set_cpu_clock_frequency( const cpu_clock_source_t _src )

{

    sys_set_soc_clk_sel( cpu_clock_source[ _src ][0] );

    sys_set_pll_clock_frequency( cpu_clock_source[ _src ][1] );

    sys_set_cpu_period_select( cpu_clock_source[ _src ][2] );

}

Code: Untitled.c Select all

typedef enum cpu_clock_source_e

{

    CPU_CLK_SRC_XTAL_CLK,

    CPU_CLK_SRC_PLL_CLK_1,

    CPU_CLK_SRC_PLL_CLK_2,

    CPU_CLK_SRC_PLL_CLK_3,

    CPU_CLK_SRC_PLL_CLK_4,

    CPU_CLK_SRC_RC_FAST_CLK

}cpu_clock_source_t;



const uint8_t cpu_clock_source[][3] = 

{

//SYSTEM_SOC_CLK_SEL    |   SYSTEM_PLL_FREQ_SEL   |   SYSTEM_PERIOD_SEL

{   0                   ,   0                     ,   0               }, 

{   1                   ,   1                     ,   0               }, 

{   1                   ,   1                     ,   1               }, 

{   1                   ,   0                     ,   0               }, 

{   1                   ,   0                     ,   1               }, 

{   2                   ,   0                     ,   0               }, 

};

[MicroController]

read the ( SYSTEM_SYSCLK_CONF_REG & SYSTEM_CLK_XTAL_FREQ_bm ) xtal frequency, i become everytime 40mhz.
it will be not change -.-*

->

SYSTEM_CLK_XTAL_FREQ This field is used to read XTAL frequency in MHz. (RO)

That field would make sense to not be changing - unless you could make the 40MHz external quartz crystal ("XTAL") change its frequency...

[BugSimpson]

i only read this register..