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Init PHY & PLL - gotta start somewhere!

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PaulStoffregen 2016-06-24 04:54:45 -07:00
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k66_usbhost.ino Normal file
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// usb host experiments....
void setup()
{
while (!Serial) ; // wait
print("USB Host Testing");
MCG_C1 |= MCG_C1_IRCLKEN; // enable MCGIRCLK 32kHz
OSC0_CR |= OSC_ERCLKEN;
SIM_SOPT2 |= SIM_SOPT2_USBREGEN; // turn on USB regulator
SIM_SOPT2 &= ~SIM_SOPT2_USBSLSRC; // use IRC for slow clock
print("power up USBHS PHY");
SIM_USBPHYCTL |= SIM_USBPHYCTL_USBDISILIM; // disable USB current limit
SIM_USBPHYCTL = SIM_USBPHYCTL_USBDISILIM | SIM_USBPHYCTL_USB3VOUTTRG(6); // pg 237
SIM_SCGC3 |= SIM_SCGC3_USBHSDCD | SIM_SCGC3_USBHSPHY | SIM_SCGC3_USBHS;
print("init USBHS PHY & PLL");
// init process: page 1681-1682
USBPHY_CTRL &= ~USBPHY_CTRL_SFTRST; // CTRL pg 1698
USBPHY_CTRL &= ~USBPHY_CTRL_CLKGATE;
USBPHY_PLL_SIC |= USBPHY_PLL_SIC_PLL_POWER;
USBPHY_PLL_SIC |= USBPHY_PLL_SIC_PLL_DIV_SEL(1); // PLL_SIC pg 1708
// wait for the PLL to lock
int count=0;
while ((USBPHY_PLL_SIC & USBPHY_PLL_SIC_PLL_LOCK) == 0) {
count++;
}
print("PLL locked, waited ", count);
// sanity check, connect 470K pullup & 100K pulldown and watch D+ voltage change
//USBPHY_ANACTRL_CLR = (1<<10); // turn off both 15K pulldowns... works! :)
SIM_SOPT2 = SIM_SOPT2 & (~SIM_SOPT2_CLKOUTSEL(7)) | SIM_SOPT2_CLKOUTSEL(3); // LPO 1kHz
SIM_SOPT2 = SIM_SOPT2 & (~SIM_SOPT2_CLKOUTSEL(7)) | SIM_SOPT2_CLKOUTSEL(2); // Flash
SIM_SOPT2 = SIM_SOPT2 & (~SIM_SOPT2_CLKOUTSEL(7)) | SIM_SOPT2_CLKOUTSEL(6); // XTAL
SIM_SOPT2 = SIM_SOPT2 & (~SIM_SOPT2_CLKOUTSEL(7)) | SIM_SOPT2_CLKOUTSEL(7); // IRC 48MHz
SIM_SOPT2 = SIM_SOPT2 & (~SIM_SOPT2_CLKOUTSEL(7)) | SIM_SOPT2_CLKOUTSEL(4); // MCGIRCLK
CORE_PIN9_CONFIG = PORT_PCR_MUX(5); // CLKOUT on PTC3 Alt5 (Arduino pin 9)
}
void loop()
{
// do nothing (yet)
}
void print(const char *s)
{
Serial.println(s);
delay(10);
}
void print(const char *s, int num)
{
Serial.print(s);
Serial.println(num);
delay(10);
}