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Set cpu frequency based on F_CPU / board_build.f_cpu #54

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Set cpu frequency based on F_CPU / board_build.f_cpu #54

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20 changes: 11 additions & 9 deletions system/CMSIS/system/system_LPC17xx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -559,15 +559,17 @@ void SystemInit (void)

LPC_SC->CCLKCFG = 0x00000002; /* Setup CPU Clock Divider */

if(isLPC1769()) {
LPC_SC->PLL0CFG = 0x0000000E; /* configure PLL0 */
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
} else {
LPC_SC->PLL0CFG = 0x00010018; // 100MHz
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;
}
#if F_CPU == 96000000
LPC_SC->PLL0CFG = 0x0000000B; /* configure PLL0 */
#elif F_CPU == 100000000
LPC_SC->PLL0CFG = 0x00010018;
#elif F_CPU == 120000000 && MCU_LPC1769
LPC_SC->PLL0CFG = 0x0000000E;
#else
#error "The configured cpu frequency is not supported"
#endif
LPC_SC->PLL0FEED = 0xAA;
LPC_SC->PLL0FEED = 0x55;

LPC_SC->PLL0CON = 0x01; /* PLL0 Enable */
LPC_SC->PLL0FEED = 0xAA;
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