void Chip_SetupXtalClocking(void)
{
/* Disconnect the Main PLL if it is connected already */
if (Chip_Clock_IsMainPLLConnected()) {
Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_CONNECT);
}
/* Disable the PLL if it is enabled */
if (Chip_Clock_IsMainPLLEnabled()) {
Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
}
/* Enable the crystal */
if (!Chip_Clock_IsCrystalEnabled())
Chip_Clock_EnableCrystal();
while(!Chip_Clock_IsCrystalEnabled()) {}
/* Set PLL0 Source to Crystal Oscillator */
Chip_Clock_SetCPUClockDiv(0);
Chip_Clock_SetMainPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
/* FCCO = ((15+1) * 2 * 12MHz) / (0+1) = 384MHz */
Chip_Clock_SetupPLL(SYSCTL_MAIN_PLL, 15, 0);
Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
/* 384MHz / (3+1) = 96MHz */
Chip_Clock_SetCPUClockDiv(3);
while (!Chip_Clock_IsMainPLLLocked()) {} /* Wait for the PLL to Lock */
Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_CONNECT);
}
/* Clock and PLL initialization based on the external oscillator */
void Chip_SetupXtalClocking(void)
{
/* Enable the crystal */
if (!Chip_Clock_IsCrystalEnabled())
Chip_Clock_EnableCrystal();
while(!Chip_Clock_IsCrystalEnabled()) {}
/* Clock the CPU from SYSCLK, in case if it is clocked by PLL0 */
Chip_Clock_SetCPUClockSource(SYSCTL_CCLKSRC_SYSCLK);
/* Disable the PLL if it is enabled */
if (Chip_Clock_IsMainPLLEnabled()) {
Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
}
/* It is safe to switch the PLL Source to Crystal Oscillator */
Chip_Clock_SetMainPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
/* FCCO = 12MHz * (9+1) * 2 * (0+1) = 240MHz */
/* Fout = FCCO / ((0+1) * 2) = 120MHz */
Chip_Clock_SetupPLL(SYSCTL_MAIN_PLL, 9, 0);
Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
Chip_Clock_SetCPUClockDiv(1);
while (!Chip_Clock_IsMainPLLLocked()) {} /* Wait for the PLL to Lock */
Chip_Clock_SetCPUClockSource(SYSCTL_CCLKSRC_MAINPLL);
/* Peripheral clocking will be derived from PLL0 with a divider of 2 (60MHz) */
Chip_Clock_SetPCLKDiv(2);
}
void Chip_SetupIrcClocking(void)
{
/* Disconnect the Main PLL if it is connected already */
if (Chip_Clock_IsMainPLLConnected()) {
Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_CONNECT);
}
/* Disable the PLL if it is enabled */
if (Chip_Clock_IsMainPLLEnabled()) {
Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
}
Chip_Clock_SetCPUClockDiv(0);
Chip_Clock_SetMainPLLSource(SYSCTL_PLLCLKSRC_IRC);
/* FCCO = ((44+1) * 2 * 4MHz) / (0+1) = 360MHz */
Chip_Clock_SetupPLL(SYSCTL_MAIN_PLL, 44, 0);
Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
Chip_Clock_SetCPUClockDiv(2);
while (!Chip_Clock_IsMainPLLLocked()) {} /* Wait for the PLL to Lock */
Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_CONNECT);
}
void setupClock(void) {
/* Disconnect the Main PLL if it is connected already */
if (Chip_Clock_IsMainPLLConnected()) {
Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_CONNECT);
}
/* Disable the PLL if it is enabled */
if (Chip_Clock_IsMainPLLEnabled()) {
Chip_Clock_DisablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
}
/* Enable the crystal */
if (!Chip_Clock_IsCrystalEnabled())
Chip_Clock_EnableCrystal();
while(!Chip_Clock_IsCrystalEnabled()) {}
/* Set PLL0 Source to Crystal Oscillator */
Chip_Clock_SetCPUClockDiv(0);
Chip_Clock_SetMainPLLSource(SYSCTL_PLLCLKSRC_MAINOSC);
/* FCCO = ((19+1) * 2 * 12MHz) / (0+1) = 480MHz */
Chip_Clock_SetupPLL(SYSCTL_MAIN_PLL, 19, 0);
Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_ENABLE);
/* 480MHz / (3+1) = 120MHz */
Chip_Clock_SetCPUClockDiv(3);
while (!Chip_Clock_IsMainPLLLocked()) {} /* Wait for the PLL to Lock */
Chip_Clock_EnablePLL(SYSCTL_MAIN_PLL, SYSCTL_PLL_CONNECT);
Chip_SYSCTL_SetFLASHAccess(FLASHTIM_120MHZ_CPU);
}