Hello,
i would like to port the example mentioned in AN10917 to a LPC1788 controller.
According to the UM10470 there is no PLCC-Register in LPC1788's PLL0CON register...
This is the original code from the Application Note
void InitClock(void)
{
// 1. Init OSC
SCS_bit.OSCRANGE = 0;
SCS_bit.OSCEN = 1;
// 2. Wait for OSC ready
while(!SCS_bit.OSCSTAT);
// 3. Disconnect PLL
PLL0CON_bit.PLLC = 0;
PLL0FEED = 0xAA;
PLL0FEED = 0x55;
// 4. Disable PLL
PLL0CON_bit.PLLE = 0;
PLL0FEED = 0xAA;
PLL0FEED = 0x55;
// 5. Select source clock for PLL
CLKSRCSEL_bit.CLKSRC = 1; // Selects the main oscillator as a PLL clock source.
// 6. Set PLL settings 300 MHz
PLL0CFG_bit.MSEL = 25-1;
PLL0CFG_bit.NSEL = 2-1;
PLL0FEED = 0xAA;
PLL0FEED = 0x55;
// 7. Enable PLL
PLL0CON_bit.PLLE = 1;
PLL0FEED = 0xAA;
PLL0FEED = 0x55;
// 8. Wait for the PLL to achieve lock
while(!PLL0STAT_bit.PLOCK);
// 9. Set clk divider settings
CCLKCFG = 3-1; // 1/3 Fpll
PCLKSEL0 = PCLKSEL1 = 0; // other peripherals 100/4 = 25MHz
// 10. Connect the PLL
PLL0CON_bit.PLLC = 1;
PLL0FEED = 0xAA;
PLL0FEED = 0x55;
}
And this is my try of porting it:
void InitClock(void)
{
// 1. Init OSC
LPC_SC->SCS &= ~(1 << 4);//OSCRANGE
LPC_SC->SCS |= (1 << 5); //OSCEN
// 2. Wait for OSC ready
while(!(LPC_SC->SCS & (1 << 6))); //OSCSTAT
// 3. Disconnect PLL
LPC_SC->PLL0CON &= ~(1 << 0);
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
// 4. Disable PLL
LPC_SC->PLL0CON &= ~(1 << 0);
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
// 5. Select source clock for PLL
LPC_SC->CLKSRCSEL |= 1; // Selects the main oscillator as a PLL clock source.
// 6. Set PLL settings 300 MHz
LPC_SC->PLL0CFG = 0x38;
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
// 7. Enable PLL
LPC_SC->PLL0CON |= 1;
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
// 8. Wait for the PLL to achieve lock
while(!(LPC_SC->PLL0STAT & (1 << 10)))
// 9. Set clk divider settings
LPC_SC->CCLKSEL |= 0x02; // 1/3 Fpll
LPC_SC->PCLKSEL = 0x04; // other peripherals 100/4 = 25MHz
// 10. Connect the PLL
LPC_SC->PLL0CON |= 1;
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
}
Can you tell me what changes i need to do, in order to use the example on the LPC1778/1788 ?
Thanks,
Christian
