I want to run LPC1788 at 120MHz with IRC and PLL. From User Manual I read that I need to set PBOOST=3 and FLASHTIM=4 or 5. Of course, I can write:
Chip_SYSCTL_EnableBoost();
Chip_SYSCTL_SetFLASHAccess(4 or 5);
Those functions are defined as:
STATIC INLINE void Chip_SYSCTL_EnableBoost(void)
{
LPC_SYSCTL->PBOOST = 0x3;
}
STATIC INLINE void Chip_SYSCTL_SetFLASHAccess(FMC_FLASHTIM_T clks)
{
uint32_t tmp = LPC_SYSCTL->FLASHCFG & 0xFFF;
/* Don't alter lower bits */
LPC_SYSCTL->FLASHCFG = tmp | (clks << 12);
}
However LPCOpen defines FMC_FLASHTIM_T as:
typedef enum {
FLASHTIM_20MHZ_CPU = 0, /*!< Flash accesses use 1 CPU clocks. Use for up to 20 MHz CPU clock */
FLASHTIM_40MHZ_CPU = 1, /*!< Flash accesses use 2 CPU clocks. Use for up to 40 MHz CPU clock */
FLASHTIM_60MHZ_CPU = 2, /*!< Flash accesses use 3 CPU clocks. Use for up to 60 MHz CPU clock */
FLASHTIM_80MHZ_CPU = 3, /*!< Flash accesses use 4 CPU clocks. Use for up to 80 MHz CPU clock */
FLASHTIM_100MHZ_CPU = 4, /*!< Flash accesses use 5 CPU clocks. Use for up to 100 MHz CPU clock */
#if defined(CHIP_LPC177X_8X) || defined(CHIP_LPC40XX)
FLASHTIM_120MHZ_CPU = 3, /*!< Flash accesses use 4 CPU clocks. Use for up to 120 MHz CPU clock with power boot on*/
#else
FLASHTIM_120MHZ_CPU = 4, /*!< Flash accesses use 5 CPU clocks. Use for up to 120 Mhz for LPC1759 and LPC1769 only.*/
#endif
FLASHTIM_SAFE_SETTING = 5, /*!< Flash accesses use 6 CPU clocks. Safe setting for any allowed conditions */
} FMC_FLASHTIM_T;
It seems to me that definition of FLASHTIM_120MHZ_CPU is faulty, because it is defined as 3 for CHIP_LPC177X_8X and CHIP_LPC40XX, instead of 4.
What is the right value to set FLASHTIM for 120MHz and power boost?
