哪个公司做网站好,优化排名软件,西安网站设计建设公司 交通,c语言网站实现系统调试信息打印接口 当系统出错时或者使用内核日志时会输出一些打印信息#xff0c;这最终都是调用到bspLib.c中的bspDebugMsg 这个接口来实现的#xff0c;所以我们在开发BSP时#xff0c;第一个要做的工作就是实现这个接口。 一般的调试信息都是通过串口来输出的这最终都是调用到bspLib.c中的bspDebugMsg 这个接口来实现的所以我们在开发BSP时第一个要做的工作就是实现这个接口。 一般的调试信息都是通过串口来输出的所以我们需要实现全志R16平台上串口发送的函数。因为U-Boot在启动时使用串口0输出信息所以我们这里只要实现串口0的发送函数即可像串口的时钟、波特率设置等等U-Boot已经帮我们做好了所以我们这里可以不用关心。另外需要说明的是在本系列教程中并不会去详细地讲解外设驱动寄存器具体如何设置我们这里关心的是BSP的框架和开发的整体流程至于寄存器怎么设置请参考厂商提供的U-Boot或者Linux下的对应代码。 由于我们现在要实现串口驱动所以可以在driver 目录下新建一个uart目录用来存放串口驱动文件 其中uart.h会被bspLib.c文件使用我们需要在uart.c中实现串口的轮询发送接口
#define __SYLIXOS_KERNEL
#include SylixOS.h
#include linux/compat.h/*********************************************************************************************************基地址定义
*********************************************************************************************************/
#define UART0_BASE (0x01c28000)
/*********************************************************************************************************寄存器偏移
*********************************************************************************************************/
#define RBR 0x0
#define THR 0x0
#define USR 0x7CVOID uartPutChar (CHAR cChar)
{// 若 FIFO 不满就填入数据否则等待while (!(readl(UART0_BASE USR) BIT(1)));writel(cChar, UART0_BASE THR);
}VOID uartPutMsg (CPCHAR cpcMsg)
{CHAR cChar;if (!cpcMsg) {return;}while ((cChar *cpcMsg) ! \0) {uartPutChar(cChar);cpcMsg;}
} 最后在bspLib.c中的bspDebugMsg 接口中调用我们实现的串口轮询发送函数即可
/*********************************************************************************************************
** 函数名称: bspDebugMsg
** 功能描述: 打印系统调试信息
** 输 入 : pcMsg 信息
** 输 出 : NONE
** 全局变量:
** 调用模块:
*********************************************************************************************************/
VOID bspDebugMsg (CPCHAR pcMsg)
{/** TODO: 通过 UART 打印系统调试信息*/uartPutMsg(pcMsg);
} 到此为止我们可以先编译出SylixOS内核镜像来启动了如果串口上有打印就说明我们最起码能通过打印来调试了。编译BSP工程(当然需要提前先编译好base工程)在Release目录下找到bsp_allwinner_r16.bin 这个文件这个就是SylixOS内核镜像将其拷贝到SD卡上将SD卡插入开发板上上电通过以下命令启动SylixOS内核 fatload mmc 0:1 40000000 bsp_allwinner_r16.bin
reading bsp_allwinner_r16.bin
3231464 bytes read in 175 ms (17.6 MiB/s)go 40000000
我们就可以在串口上看到SylixOS启动过程中的日志打印
## Starting application at 0x40000000 ...
longwing(TM) kernel initialize...
kernel low level initialize...
kernel heap build...
semaphore heap_lock has been create.
kernel heap has been create 0x40f08c18 (47149928 Bytes).
system heap build...
system heap has been create 0x0 (0 Bytes).
kernel interrupt vector initialize...
kernel high level initialize...
semaphore sigfdsel_lock has been create.
thread t_idle0 has been initialized.
thread t_idle0 has been start.
thread t_itimer has been initialized.
thread t_itimer has been start.
semaphore job_sync has been create.
thread t_isrdefer has been initialized.
thread t_isrdefer has been start.
semaphore job_sync has been create.
thread t_except has been create.
msgqueue log_msg has been create.
partition printk_pool has been create.
thread t_log has been initialized.
semaphore ios_mutex has been create.
semaphore evtfdsel_lock has been create.
semaphore bmsgsel_lock has been create.
semaphore bmsgd_lock has been create.
semaphore semfdsel_lock has been create.
semaphore semfd_lock has been create.
semaphore tmrfdsel_lock has been create.
semaphore hstmrfdsel_lock has been create.
semaphore gpiofdsel_lock has been create.
semaphore blkio_lock has been create.
semaphore autom_lock has been create.
semaphore mount_lock has been create.
semaphore bus_listlock has been create.
semaphore blk_lock has been create.
semaphore power_lock has been create.
semaphore sel_wakeup has been create.
thread t_power has been create.
semaphore job_sync has been create.
semaphore hotplug_lock has been create.
semaphore sel_wakeup has been create.
thread t_hotplug has been create.
semaphore hpsel_lock has been create.
semaphore hotplug_lock has been create.
system initialized.
semaphore cpprt_lock has been create.
semaphore cond_signal has been create.
c run time lib initialized.
kernel primary cpu usrStartup...
ARM(R) 920 none FPU pri-core initialization.
FPU initilaized.
__vmmVirtualCreate() bug: virtual switich page invalidate.
当然这时候系统是不可能完全启起来的因为我们现在只是实现了调试信息输出而已。
另外在开发的过程中可能需要带参数打印一些信息这时候就不能使用bspDebugMsg 了这个接口只能打印纯字符串我们可以使用_PrintFormat 来打印变量值等等信息用法类似于printf。
IMX6ULL相关的总结
1我们这里的打印参照的是正点原子的裸机的串口打印的程序
2load拷贝数据的时候是放在80000000的地址处按照的是芯片手册的逻辑。
