when i call TFT_eSprite method drawString, system crash down and reboot, code as following:

M5.Lcd.fillScreen(TFT_BLACK);
TFT_eSprite tftSprite = TFT_eSprite(&M5.Lcd);
tftSprite.createSprite(320, 120);
while (true)
{
if(SoundWave::suspend) {
TaskHandle_t hTask = xTaskGetCurrentTaskHandle();
vTaskSuspend(hTask);
}
uint32_t ulNotificationValue = ulTaskNotifyTake(pdTRUE, xMaxBlockTime);
if (ulNotificationValue > 0)
{
tftSprite.fillSprite(TFT_BLACK);
tftSprite.drawString("hello",10,20,TFT_WHITE);
tftSprite.pushSprite(0,60);
}
}
why?

I run following code in m5stack fire board

from machine import UART
uart1 = UART(1, tx=1, rx=3)
uart1.init(115200, bits=8, parity=None, stop=1)
def UART_ISR(t):
uart1.irq(handler=UART_ISR)

bu report error message:
'UART' object has no attribut 'irq'.
does uiflow support irq?