QSPI_core.c 库BUG请确认

发布于 2020-04-09 15:13:45 浏览：1214 订阅该版

平台：lpc54608+MX25L256 Flash

由于使用4线QSPI模式故Flash需开启QSPI Mode 需要写flash寄存器 （规则=命令+寄存器）

利用rt_qspi_send函数

void mx25lxx_enter_qspi_mode(struct rt_qspi_device *device)
{
 uint8_t cs = 1;
 uint8_t write_enable = 0x06;
 uint8_t read_status  = 0x05;
 uint8_t read_status1 = 0x15;
 uint8_t status;
 uint8_t Config;
 uint8_t write_status_buf[3]  = {0x01, 0x40}; 
 
 rt_qspi_send_then_recv(device, &read_status,  1, &status, 1);
 rt_qspi_send_then_recv(device, &read_status1, 1, &Config, 1);
 rt_kprintf("read status register = %x %x<br>", status,Config);
 if((status&0x40)!=0x40){
  rt_qspi_send(device, &write_enable, 1);
  rt_qspi_send(device, write_status_buf, 2);
 }
  rt_qspi_send_then_recv(device, &read_status,  1, &status, 1);
 rt_qspi_send_then_recv(device, &read_status1, 1, &Config, 1);
 qspi_mode_flag = 1;
 rt_kprintf("read status register = %x %x<br>", status,Config);
  rt_kprintf("mx25lxx_enter_qspi_mode <br>");
}
在函数rt_qspi_send中会发现函数里判断if (length > 1)如果大于1就认为是需要判断地址 并且还判断length长度是否为大于4 和5 （判断地址是3线还是4线）
当调用rt_qspi_send去写寄存器时命令加寄存器内容长度为2则会返回一个return -RT_ERROR;跳出命令和寄存器都不能发送出去
rt_err_t rt_qspi_send(struct rt_qspi_device *device, const void *send_buf, rt_size_t length)
{
    RT_ASSERT(send_buf);
    RT_ASSERT(length != 0);
    struct rt_qspi_message message;
    char *ptr = (char *)send_buf;
    rt_size_t  count = 0;
    rt_err_t result = 0;
    message.instruction.content = ptr[0];
    message.instruction.qspi_lines = 1;
    count++;
    /* get address */
    if (length > 1)
    {
        if (device->config.medium_size > 0x1000000 && length >= 5)
        {
            /* medium size greater than 16Mb, address size is 4 Byte */
            message.address.content = (ptr[1] << 24) | (ptr[2] << 16) | (ptr[3] << 8) | (ptr[4]);
            message.address.size = 32;
      message.address.qspi_lines = 1;
     
            count += 4;
        }
        else if (length >= 4)
        {
            /* address size is 3 Byte */
            message.address.content = (ptr[1] << 16) | (ptr[2] << 8) | (ptr[3]);
            message.address.size = 24;
            message.address.qspi_lines = 1;
            count += 3;
        }
        else
        {
            return -RT_ERROR; 当需要发送长度为2 3时此处跳出命令及寄存器无法发送
        }
    }
    else
    {
        /* no address stage */
        message.address.content = 0 ;
        message.address.qspi_lines = 0;
        message.address.size = 0;
    }
    message.alternate_bytes.content = 0;
    message.alternate_bytes.size = 0;
    message.alternate_bytes.qspi_lines = 0;
    message.dummy_cycles = 0;
    /* determine if there is data to send */
    if (length - count > 0)
    {
        message.qspi_data_lines = 1;
    }
    else
    {
        message.qspi_data_lines = 0;
    }
    
    /* set send buf and send size */
    message.parent.send_buf = ptr + count;
    message.parent.recv_buf = RT_NULL;
    message.parent.length = length - count;
    message.parent.cs_take = 1;
    message.parent.cs_release = 1;
    result = rt_qspi_transfer_message(device, &message);
    if (result == 0)
    {
        result = -RT_EIO;
    }
    else
    {
        result = length;
    }
    return result;
}
由此引发无法配置Flash某些命令+寄存的配置 并且在msh中 sf status 写寄存器也会无法写成功

修改方案1：if (length > 1) 改成 if (length > 3)
修改方案2：return -RT_ERROR; 地方再加上length为2 3的处理