AN4124 datasheet(21/32 Pages) STMICROELECTRONICS

21 / 32 page

AN4124

Redundancy and functions

Doc ID 023294 Rev 2

21/32

A.2

General purpose function

Below are some general purpose functions, settinf and clearing registers.

A.2.1

Config state

uint32_t FCCU_CONFIG_STATE(void){

/* ----------------- CONFIG State --------------------- */

FCCU.CTRLK.R = CTRLK_OP1;

/* Key for the operation OP1 */

FCCU.CTRL.R = CTRL_OPR1;

/* Set the FCCU into the CONFIG state [OP1] */

while(FCCU.CTRL.B.OPS != CTRL_OPS3);

/* wait for the completion of the

operation */

return 1;

}

A.2.2

Normal state

uint32_t FCCU_NORMAL_STATE(void){

/* ----------------- NORMAL State --------------------- */

FCCU.CTRLK.R = CTRLK_OP2;

/* Key for the operation OP2 */

FCCU.CTRL.R = CTRL_OPR2;

/* Set the FCCU into the NORMAL state [OP2] */

while(FCCU.CTRL.B.OPS != CTRL_OPS3);

/* wait for the completion of the

operation */

return 1;

}

A.2.3

Lock FCCU

uint32_t FCCU_LOCK(void){

/* ----------------- NORMAL State --------------------- */

FCCU.CTRLK.R = CTRLK_OP16;

/* Key for the operation OP16 */

FCCU.CTRL.R = CTRL_OPR2;

/* Lock the FCCU configuration [OP16] */

while(FCCU.CTRL.B.OPS != CTRL_OPS3);

/* wait for the completion of the

operation */

return 1;

}

A.2.4

Read status register

uint32_t FCCU_CFS_Read(uint32_t CFS_number, uint32_t* CFS_Value){

uint32_t exit_value= 0;/* Returned value = ERROR */

uint32_t Reg_Selection = 0;/* Register Selection [0..3] */

if (CFS_number <= 127){

FCCU.CTRL.B.OPR = CTRL_OPR9;

/* Set the OP9 */

while(FCCU.CTRL.B.OPS != CTRL_OPS3); /* wait for the completion of the

operation */

Reg_Selection = (CFS_number/32);

/* INT(CFS_number/32)*/

switch (Reg_Selection){

case 0 : *CFS_Value = (FCCU.CFS0.R >> (CFS_number%32)) & 1;

/* Read the critical fault latched state */

break;

case 1 : *CFS_Value = (FCCU.CFS1.R >> (CFS_number%32)) & 1;

/* Read the critical fault latched state */

break;

case 2 : *CFS_Value = (FCCU.CFS2.R >> (CFS_number%32)) & 1;

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