MT25QL01GBBB非易失配置寄存器异常恢复技术求助

问题现象 #

发送写入非易失配置寄存器命令后，因代码逻辑错误导致Nonvolatile Configuration Register处于不确定状态。

开发环境 #

• 主控芯片：STM32F765VGT6
• Flash芯片：MT25QL01GBBB8ESF-0SIT
• 开发工具：STM32CubeIDE，C语言+STM32 HAL库

背景信息 #

此前已验证读JEDEC ID、页编程等SPI命令均正常工作，但写入非易失配置寄存器后，所有测试代码均失效。尝试过软件复位、硬件复位引脚复位芯片，同一SPI总线上的同款芯片（未测试写非易失配置寄存器功能）其余功能正常。目前基于Flash文档实现了掉电恢复和接口恢复函数，但Flash仍无法正常工作。

测试结果 #

引发问题的函数 #

uint16_t reverse_bits(uint16_t byte)
{
    byte = (byte & 0xFF00) >> 8 | (byte & 0xFF) << 8;
    byte = (byte & 0xF0F0) >> 4 | (byte & 0xF0F) << 4;
    byte = (byte & 0xCCCC) >> 2 | (byte & 0x3333) << 2;
    byte = (byte & 0xAAAA) >> 1 | (byte & 0x555) << 1;
    return byte;
}
void MT25QL_WriteNONVOL(SPI_HandleTypeDef *hspi, MT25QL_FM_NO_t FM, uint16_t reg_val)
{
    uint8_t tData[3];
    reg_val = reverse_bits(reg_val);
    tData[0] = WRITE_NONVOL_CFG_REG_CMD;
    tData[1] = (reg_val) & 0xFF;
    tData[2] = (reg_val >> 8) & 0xFF;

    write_enable(hspi, FM);
    csLOW(FM);
    SPI_Write(hspi, tData, 3);
    csHIGH(FM);

    //write enable reset is automatic
}

主函数中执行恢复的代码 #

LedToggle();
MT25QL_PowerLossRecovery(&hspi1, MT25QL_FM1);
LedToggle();
HAL_Delay(10);
LedToggle();
MT25QL_InterfaceRescue(&hspi1, MT25QL_FM1);
LedToggle();
ID = MT25QL_ReadID(&hspi1, MT25QL_FM1);
FSR = MT25QL_ReadFSR(&hspi1, MT25QL_FM1);
LedToggle();

实现的恢复函数 #

HAL_StatusTypeDef MT25QL_InterfaceRescue(SPI_HandleTypeDef *hspi, MT25QL_FM_NO_t FM)
{
    // Step 1: Recovery sequence
    recovery_sequence(hspi, FM, 7); // Example for 7 clock cycles
    recovery_sequence(hspi, FM, 9);
    recovery_sequence(hspi, FM, 13);
    recovery_sequence(hspi, FM, 17);
    recovery_sequence(hspi, FM, 25);
    recovery_sequence(hspi, FM, 33);

    // Step 2: Interface rescue
    interface_rescue(hspi, FM);

    return HAL_OK;
}

HAL_StatusTypeDef MT25QL_PowerLossRecovery(SPI_HandleTypeDef *hspi, MT25QL_FM_NO_t FM)
{
    // Step 1: Recovery sequence
    recovery_sequence(hspi, FM, 7); // Example for 7 clock cycles
    recovery_sequence(hspi, FM, 9);
    recovery_sequence(hspi, FM, 13);
    recovery_sequence(hspi, FM, 17);
    recovery_sequence(hspi, FM, 25);
    recovery_sequence(hspi, FM, 33);

    // Step 2: Power Loss Recovery
    power_loss_recovery(hspi, FM);

    return HAL_OK;
}

辅助函数 #

static void SPI_Write(SPI_HandleTypeDef *hspi, uint8_t *data, uint8_t len)
{
    HAL_SPI_Transmit(hspi, data, len, HAL_MAX_DELAY);
}

static void SPI_Read(SPI_HandleTypeDef *hspi, uint8_t *data, uint32_t len)
{
    HAL_SPI_Receive(hspi, data, len, HAL_MAX_DELAY);
}
static void recovery_sequence(SPI_HandleTypeDef *hspi, MT25QL_FM_NO_t FM, uint8_t clock_cycles) {
    uint8_t dummy_data[34] = {DUMMY_CLOCKS}; // Max needed cycles is 34
    csLOW(FM);
    SPI_Write(hspi, dummy_data, clock_cycles);
    csHIGH(FM);
}

static void power_loss_recovery(SPI_HandleTypeDef *hspi, MT25QL_FM_NO_t FM) {
    uint8_t dummy_data[8] = {DUMMY_CLOCKS};
    csLOW(FM);
    SPI_Write(hspi, dummy_data, 8);
    csHIGH(FM);
    //HAL_Delay(1); // Ensure tSHSL2 >= 50ns
}

static void interface_rescue(SPI_HandleTypeDef *hspi, MT25QL_FM_NO_t FM) {
    uint8_t dummy_data[16] = {DUMMY_CLOCKS};
    csLOW(FM);
    SPI_Write(hspi, dummy_data, 16);
    csHIGH(FM);
    //HAL_Delay(1); // Ensure tSHSL2 >= 50ns
}

已知建议方向 #

执行掉电恢复序列，可通过将SCK、DQ0和DQ3引脚设为GPIO并运行对应恢复函数实现。

内容的提问来源于stack exchange，提问作者Waynsday