[参考译文] BQ76972：使用 STM32G4 通过 I2C 启用 FET 时需要帮助

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1534998/bq76972-assistance-required-for-enabling-fets-via-i2c-using-stm32g4

工具/软件：

尊敬的 TI 团队：

我目前正在尝试访问 FET 寄存器子命令以启用 FET 进行充电。 但是、该命令在执行期间似乎失败。 您能提出任何启用 FET 的替代方法吗？

对于通信、我将使用 I2C 协议与 STM32G4 MCU。

请查找所附用于启用 FET 的代码片段。

感谢您的支持。

此致、

恶劣

#define BQ76972_I2C_ADDR_WRITE      0x10

void BQ76972_Unseal(I2C_HandleTypeDef *hi2c3)
{
	char message[64];
	uint8_t unseal_key1[] = { 0x14, 0x04 };
	uint8_t unseal_key2[] = { 0x72, 0x36 };
	HAL_GPIO_WritePin(MCU_BMS_RESET_GPIO_Port, MCU_BMS_RESET_Pin, GPIO_PIN_SET);
	HAL_Delay(100);
	HAL_GPIO_WritePin(MCU_BMS_RESET_GPIO_Port, MCU_BMS_RESET_Pin, GPIO_PIN_RESET);
	HAL_Delay(300);

	if(HAL_I2C_Mem_Write(hi2c3, BQ76972_I2C_ADDR_WRITE, 0x00, I2C_MEMADD_SIZE_8BIT, unseal_key1, 2, 100) == HAL_OK)
    {
    	snprintf(message, sizeof(message),"Unseal success\r\n");
		RS485_Transmit((uint8_t*)message, strlen(message));
    }
    else
	{
		snprintf(message, sizeof(message), "Unseal Step 1 failed\r\n");
		RS485_Transmit((uint8_t*)message, strlen(message));
	}
    HAL_Delay(5);
    HAL_I2C_Mem_Write(hi2c3, BQ76972_I2C_ADDR_WRITE, 0x74, I2C_MEMADD_SIZE_8BIT, unseal_key2, 4, 100);
    HAL_Delay(5);
}


void BQ76972_Enter_ConfigUpdate(I2C_HandleTypeDef *hi2c3)
{
	char config_msg_1[30];
    uint8_t cfgupdate_cmd[] = { 0x90, 0x00 }; // Subcommand = 0x0090
	if(HAL_I2C_Mem_Write(hi2c3, BQ76972_I2C_ADDR_WRITE, CMD_SUBCOMMAND, I2C_MEMADD_SIZE_8BIT, cfgupdate_cmd, 2, 100) == HAL_OK)
	{
		snprintf(config_msg_1, sizeof(config_msg_1),"Config. mode success\r\n");
		RS485_Transmit((uint8_t*)config_msg_1, strlen(config_msg_1));
	}
    HAL_Delay(5);
}


void BQ76972_WriteFETOptions(I2C_HandleTypeDef *hi2c3)
{
    char msg[64];
    uint8_t offset_subclass[2] = { 0x40, 0x80 }; // Offset = 0x40 (FET Options), Subclass = 0x80
    uint8_t value = 0x07; // FET_CTRL_EN=1, HOST_FET_EN=1, DCHG_EN=1
    uint8_t len = 1;

    if(HAL_I2C_Mem_Write(hi2c3, 0x10, 0x3E, I2C_MEMADD_SIZE_8BIT, offset_subclass, 2, 1000) != HAL_OK)
	{
    	snprintf(msg, sizeof(msg), "FET 0x3E Fail\r\n");
		RS485_Transmit((uint8_t*)msg, strlen(msg));
		return;
	}
    HAL_Delay(2);
    if(HAL_I2C_Mem_Write(hi2c3, 0x10, 0x40, I2C_MEMADD_SIZE_8BIT, &value, 1, 1000) != HAL_OK)
    {
    	snprintf(msg, sizeof(msg), "FET 0x40 Fail\r\n");
		RS485_Transmit((uint8_t*)msg, strlen(msg));
		return;
    }
    HAL_Delay(2);
    if(HAL_I2C_Mem_Write(hi2c3, 0x10, 0x61, I2C_MEMADD_SIZE_8BIT, &len, 1, 1000) != HAL_OK)
    {
    	snprintf(msg, sizeof(msg), "FET 0x61 Fail\r\n");
		RS485_Transmit((uint8_t*)msg, strlen(msg));
		return;
    }
    HAL_Delay(5);

    snprintf(msg, sizeof(msg), "FET Options write successfully\r\n");
    RS485_Transmit((uint8_t*)msg, strlen(msg));
}


void BQ76972_Exit_ConfigUpdate(I2C_HandleTypeDef *hi2c3)
{
	char exit_msg[30];
    uint8_t exit_cmd[] = {0x92, 0x00};
    if(HAL_I2C_Mem_Write(hi2c3, BQ76972_I2C_ADDR_WRITE, CMD_SUBCOMMAND, I2C_MEMADD_SIZE_8BIT, exit_cmd, 2, 100) == HAL_OK)
    {
    	snprintf(exit_msg, sizeof(exit_msg), "Exit config. Success\r\n");
		RS485_Transmit((uint8_t*)exit_msg, strlen(exit_msg));
    }
}


void BQ76972_Enable_AllFETs(I2C_HandleTypeDef *hi2c3)
{
    uint8_t all_fets_on_cmd[] = {0x0096, 0x00}; // Subcommand for ALL_FETS_ON
    char tx_msg[64];

    if (HAL_I2C_Mem_Write(hi2c3, 0x10, 0x00, I2C_MEMADD_SIZE_8BIT, all_fets_on_cmd, 2, 1000) == HAL_OK)
    {
        snprintf(tx_msg, sizeof(tx_msg), "ALL_FETS_ON command success\r\n");
    }
    else
    {
        snprintf(tx_msg, sizeof(tx_msg), "ALL_FETS_ON command failed\r\n");
    }

    RS485_Transmit((uint8_t*)tx_msg, strlen(tx_msg));
}