Has anybody successfully used 32KHz IRC as REF for SYSTEM clock (using FLL) in MQX 4.1.1 ?
I need this PATH:
Seems like the clock setting state machine (inside the function; CPU_SetClockConfigGenMode(LDD_TClockConfiguration ConfigID)) is coded in a way that this cannot happen.
Any Freescale folks want to pitch in ?
Message was edited by: Nitin Harish
Message was edited by: Nitin Harish
Thanks David
After doing some real digging, I found the root cause of my issue. This piece of code which is doing Auto-trimming strongly assumes that their is an external reference clock in-spite of the fact I am setting all registers for using 32KHz IRC as REF clock, this function is used and called in in MQX 4.1.1's "bsp_cm.c" but NOT in Processor Expert output (which seems like an issue to me with MQX 4.1.1)
Kindly read the comments in the function below. the line that is the main issue is BusClockMHz calculation.
I request you @David E Seymourand soledad to NOT go quite on this. Please respond with your views and action plan if any or at least prove that I am wrong.
/*
** ===================================================================
** Method : CPU_MCGAutoTrim (component MK64FN1M0LQ12)
*/
/*!
** @brief
** This method uses MCG auto trim feature to trim internal
** reference clock. This method can be used only in a clock
** configuration which derives its bus clock from external
** reference clock ([MCG mode] must be one of the following
** modes - FEE, FBE, BLPE, PEE, PBE) and if value of [Bus clock]
** is in the range <8; 16>MHz.
** The slow internal reference clock is trimmed to the value
** selected by [Slow internal reference clock [kHz]] property.
** The fast internal reference clock will be trimmed to value
** 4MHz.
** @param
** ClockSelect - Selects which internal
** reference clock will be trimmed.
** 0 ... slow (32kHz) internal reference clock
** will be trimmed
** > 0 ... fast (4MHz) internal reference
** clock will be trimmed
** @return
** - Error code
** ERR_OK - OK
** ERR_SPEED - The method does not work in the
** active clock configuration.
** ERR_FAILED - Autotrim process failed.
*/
/* ===================================================================*/
LDD_TError CPU_MCGAutoTrim(uint8_t ClockSelect)
{
uint16_t CompareValue; /* Autotrim compare value expected count */
uint16_t BusClockMHz = (uint16_t)((uint32_t)(CPU_ClockConfigDescriptors[ClockConfigurationID].BusClock) /1000000UL); /* Bus clock in MHz */
/* Calculate compare value */
if (((CPU_ClockConfigDescriptors[ClockConfigurationID].Mode & (CPU_CLOCK_EXTERNAL_CLOCK_MASK | CPU_CLOCK_EXTERNAL_CRYSTAL_MASK)) != 0) && (BusClockMHz >= 8U) && (BusClockMHz <= 16U)) {
if (ClockSelect == 0x00U) {
CompareValue = (uint16_t)(21000 * BusClockMHz / CPU_INT_SLOW_CLK_HZ); /* Slow internal reference clock */
} else {
CompareValue = (uint16_t)(672U * BusClockMHz); /* Fast internal reference clock */
}
} else {
return ERR_SPEED; /* MCU has to be clocked from external clock and has to have bus clock in allowed range */
}
MCG_ATCVH = (uint8_t)(CompareValue >> 8U); /* Set compare value high half */
MCG_ATCVL = (uint8_t)(CompareValue & 255U); /* Set compare value low half */
if (ClockSelect == 0x00U) {
/* MCG_SC: ATME=1,ATMS=0,LOCS0=0 */
MCG_SC = (uint8_t)((MCG_SC & (uint8_t)~(uint8_t)(
MCG_SC_ATMS_MASK |
MCG_SC_LOCS0_MASK
)) | (uint8_t)(
MCG_SC_ATME_MASK
)); /* Start trimming of the slow internal reference clock */
} else {
/* MCG_SC: ATME=1,ATMS=1,LOCS0=0 */
MCG_SC = (uint8_t)((MCG_SC & (uint8_t)~(uint8_t)(
MCG_SC_LOCS0_MASK
)) | (uint8_t)(
MCG_SC_ATME_MASK |
MCG_SC_ATMS_MASK
)); /* Start trimming of the fast internal reference clock */
}
while ((MCG_SC & MCG_SC_ATME_MASK) != 0x00U) { /* Wait until autotrim completes */
}
if ((MCG_SC & MCG_SC_ATMF_MASK) == 0x00U) {
return ERR_OK; /* Trim operation completed successfully */
} else {
return ERR_FAILED; /* Trim operation failed */
}
}
mjbcswitzerland: Some information for your consultancy too 
Has anybody successfully used 32KHz IRC as REF for SYSTEM clock (using FLL) in MQX 4.1.1 ?
I need this PATH:
Seems like the clock setting state machine (inside the function; CPU_SetClockConfigGenMode(LDD_TClockConfiguration ConfigID)) is coded in a way that this cannot happen.
Any Freescale folks want to pitch in ?
Thanks David
After doing some real digging, I found the root cause of my issue. This piece of code which is doing Auto-trimming strongly assumes that their is an external reference clock in-spite of the fact I am setting all registers for using 32KHz IRC as REF clock, this function is used and called in in MQX 4.1.1's "bsp_cm.c" but NOT in Processor Expert output (which seems like an issue to me with MQX 4.1.1)
Kindly read the comments in the function below. the line that is the main issue is BusClockMHz calculation.
I request you @David E Seymourand soledad to NOT go quite on this. Please respond with your views and action plan if any or at least prove that I am wrong.
/*
** ===================================================================
** Method : CPU_MCGAutoTrim (component MK64FN1M0LQ12)
*/
/*!
** @brief
** This method uses MCG auto trim feature to trim internal
** reference clock. This method can be used only in a clock
** configuration which derives its bus clock from external
** reference clock ([MCG mode] must be one of the following
** modes - FEE, FBE, BLPE, PEE, PBE) and if value of [Bus clock]
** is in the range <8; 16>MHz.
** The slow internal reference clock is trimmed to the value
** selected by [Slow internal reference clock [kHz]] property.
** The fast internal reference clock will be trimmed to value
** 4MHz.
** @param
** ClockSelect - Selects which internal
** reference clock will be trimmed.
** 0 ... slow (32kHz) internal reference clock
** will be trimmed
** > 0 ... fast (4MHz) internal reference
** clock will be trimmed
** @return
** - Error code
** ERR_OK - OK
** ERR_SPEED - The method does not work in the
** active clock configuration.
** ERR_FAILED - Autotrim process failed.
*/
/* ===================================================================*/
LDD_TError CPU_MCGAutoTrim(uint8_t ClockSelect)
{
uint16_t CompareValue; /* Autotrim compare value expected count */
uint16_t BusClockMHz = (uint16_t)((uint32_t)(CPU_ClockConfigDescriptors[ClockConfigurationID].BusClock) /1000000UL); /* Bus clock in MHz */
/* Calculate compare value */
if (((CPU_ClockConfigDescriptors[ClockConfigurationID].Mode & (CPU_CLOCK_EXTERNAL_CLOCK_MASK | CPU_CLOCK_EXTERNAL_CRYSTAL_MASK)) != 0) && (BusClockMHz >= 8U) && (BusClockMHz <= 16U)) {
if (ClockSelect == 0x00U) {
CompareValue = (uint16_t)(21000 * BusClockMHz / CPU_INT_SLOW_CLK_HZ); /* Slow internal reference clock */
} else {
CompareValue = (uint16_t)(672U * BusClockMHz); /* Fast internal reference clock */
}
} else {
return ERR_SPEED; /* MCU has to be clocked from external clock and has to have bus clock in allowed range */
}
MCG_ATCVH = (uint8_t)(CompareValue >> 8U); /* Set compare value high half */
MCG_ATCVL = (uint8_t)(CompareValue & 255U); /* Set compare value low half */
if (ClockSelect == 0x00U) {
/* MCG_SC: ATME=1,ATMS=0,LOCS0=0 */
MCG_SC = (uint8_t)((MCG_SC & (uint8_t)~(uint8_t)(
MCG_SC_ATMS_MASK |
MCG_SC_LOCS0_MASK
)) | (uint8_t)(
MCG_SC_ATME_MASK
)); /* Start trimming of the slow internal reference clock */
} else {
/* MCG_SC: ATME=1,ATMS=1,LOCS0=0 */
MCG_SC = (uint8_t)((MCG_SC & (uint8_t)~(uint8_t)(
MCG_SC_LOCS0_MASK
)) | (uint8_t)(
MCG_SC_ATME_MASK |
MCG_SC_ATMS_MASK
)); /* Start trimming of the fast internal reference clock */
}
while ((MCG_SC & MCG_SC_ATME_MASK) != 0x00U) { /* Wait until autotrim completes */
}
if ((MCG_SC & MCG_SC_ATMF_MASK) == 0x00U) {
return ERR_OK; /* Trim operation completed successfully */
} else {
return ERR_FAILED; /* Trim operation failed */
}
}
mjbcswitzerland: Some information for your consultancy too
