RT，当gd32h7在启用exmc驱动sdram、启用tli刷屏时，比如刷屏1024*600@rgb565，如果在启动tli之前，通过seggerRTT输出过任何内容，比如调试信息、启动信息、系统状态之类，哪怕只是无意义数据。在启动tli之后，哪怕是再也不调用任何seggerRTT相关代码，也能在seggerRTT的rtt-viewer中看到之前发送的内容被自动、重复、偶发性、周期不定、长度不定地反复发送。这个过程没有任何代码执行seggerRTT相关函数，是seggerRTT自发地。
在关掉tli后，问题消失；在出现问题后，用一个定时器比如10s后关闭tli，问题在10s后再也不出现；裸机、rtthread-nano、freeRTOS三种环境都能看到这个现象：只要启动tli开始刷屏，那么seggerRTT输出就会非常混乱。
比如，裸机代码：
“
int main(void)
{
sys_cache_enable(); /* 使能CPU cache */
SEGGER_RTT_printf(0, "RTT TEST 0000: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0001: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0002: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0003: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0004: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0005: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0006: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0007: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0008: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0009: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0010: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0011: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0012: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0013: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0014: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0015: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0016: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0017: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0018: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
SEGGER_RTT_printf(0, "RTT TEST 0019: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\r\n");
delay_init(600); /* 延时初始化 */
usart_init(115200); /* 初始化串口 */
usmart_init(300); /* 初始化USMART */
led_init(); /* 初始化LED */
mpu_memory_protection(); /* 保护相关存储区域 */
sdram_init(EXMC_SDRAM_DEVICE0); /* 初始化SDRAM */
lcd_init(); /* 初始化LCD */
key_init(); /* 初始化按键 */
tp_dev.init(); /* 触摸屏初始化 */
timerx_int_init(10 - 1, 30000 - 1); /* 300 000 000 / 30000 = 10KHz 10KHz的计数频率，计数10次为1ms */
my_mem_init(SRAMIN); /* 初始化内部SRAM内存池 */
my_mem_init(SRAMEX); /* 初始化外部SDRAM内存池 */
my_mem_init(SRAMDTCM); /* 初始化内部DTCM内存池 */
my_mem_init(SRAMITCM); /* 初始化内部ITCM内存池 */
delay_ms(1000);
lv_init(); /* lvgl系统初始化 */
lv_port_disp_init(); /* lvgl显示接口初始化,放在lv_init()的后面 */
lv_port_indev_init(); /* lvgl输入接口初始化,放在lv_init()的后面 */
lv_demo_benchmark(); /* lvgl例程 */
//
while (1)
{
// tp_dev.scan(0); /* 触摸扫描 */
lv_task_handler(); /* lvgl的事务处理 */
delay_ms(1);
}
}
”
rtt-viewer输出内容：
“
RTT TEST 0000: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0001: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0002: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0003: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0004: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0005: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0006: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0007: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0008: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0009: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0010: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0011: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0012: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0013: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0014: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0015: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0016: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0017: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0018: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0019: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0000: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0001: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0002: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0003: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0004: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0005: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0006: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0007: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0008: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0009: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0010: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0011: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0012: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0013: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0014: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0015: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0016: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0017: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0018: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0019: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
mnopqrstuvwxyz
RTT TEST 0004: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0005: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0006: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0007: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0008: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0009: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0010: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0011: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0012: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0013: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0014: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0015: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0016: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0017: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0018: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0019: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0000: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0001: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0002: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0003: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0004: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0005: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0006: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0007: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0008: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0009: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0010: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0011: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0012: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0013: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0014: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0015: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0016: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0017: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0018: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
RTT TEST 0019: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
”
这个全过程，mcu只启动了1次，且没有中途重启，因为它一直在跑lvgl的testbench，没有重新开始。但输出内容就是重复了多次。
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