LPC4370 M4 Clock

cpchen — Sat, 09 May 2020 09:02:26 GMT

I am using LPC4370 for a project, try to figure out what is the clock M4 CPU cruns on , the code retrieve the CPU clock is show below in BOLD. however, debug output below shows CPU is running on 204MHz even before the SystemCoreClockUpdate() was performed. This does not match LPC4370 manual and many posts , which all said the M4 CPU does not power up to 204MHz, and need to raise the speed by whoever do the coding.

Did I do something or understood something wrong ? can anyone help to clarify this ? raymundovelarde ErichS

int main(void)
{
uint32_t i;
uint32_t f1;
f1 = Chip_Clock_GetRate(CLK_BASE_MX);
DEBUGOUT("Before SystemCoreClockUpdate f1 = %d \r\n",f1);
SystemCoreClockUpdate();
f1 = Chip_Clock_GetRate(CLK_BASE_MX);
DEBUGOUT("After SystemCoreClockUpdate f1 = %d \r\n",f1);
Board_Init();
TEST_START = 1;

......... continue ......

Re: LPC4370 M4 Clock

Alice_Yang — Mon, 11 May 2020 07:57:54 GMT

Hello CHEN CHUANPING ,

Please check the code before run into main(), it already configured the clock:

there is a SystemInit()->Board_SystemInit()-> Board_SetupClocking();

Have a great day,
TIC

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