gd32450i-eval/app/bmc/AuthChip/CM_WRCFG.c

// Write Configuration Zone
//

// CryptoMemory Library Include Files
#include "CM_LIB.h"
#include "CM_I2C.h"
#include "CM_I2C_L.h"
#include "CM_GPA.h"

// Write Configuration Zone
uint8_t cm_WriteConfigZone(uint8_t ucCryptoAddr, uint8_t* pucBuffer, uint8_t ucCount, uint8_t ucAntiTearing)
{
    uint8_t ucReturn, ucEncrypt;
	
    ucCM_InsBuff[0] = 0xb4;
    if(ucAntiTearing) ucCM_InsBuff[1] = 0x08;
    else              ucCM_InsBuff[1] = 0x00;
    ucCM_InsBuff[2] = ucCryptoAddr;
    ucCM_InsBuff[3] = ucCount;

    // Three bytes of the command must be included in the polynominals
    cm_GPAcmd2(ucCM_InsBuff);
    
    // Only password zone is ever encrypted
    ucEncrypt = ((ucCryptoAddr>= CM_PSW) && ucCM_Encrypt);

    // Include the data in the polynominals and encrypt if required
    cm_GPAencrypt(ucEncrypt, pucBuffer, ucCount); 

    // Do the write
    ucReturn = cm_WriteCommand(ucCM_InsBuff, pucBuffer,ucCount);

    // when anti-tearing, the host should send ACK should >= 20ms after write command
    if (ucAntiTearing) CM_LOW_LEVEL.WaitClock(10);

    return ucReturn;
}