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高通msm8953的gpio发送Break and Break Recovery,然后BQ27542无响应,不能通讯

Other Parts Discussed in Thread: BQSTUDIO

hi TI,
我这边根据BQ27542datasheet的Timing Requirements: HDQ Communication 图(a) ,将HDQ拉低延时500us,然后在拉高延时60us,通过示波器抓到的波形图来看,发现这颗IC没有响应(没有产生波形图(b))。
我这边测试的代码如下图,请帮我分析下可能是什么原因导致的?非常感谢!!!
 
代码:
 gpio_set_value(onewire_gpio,0);
 w1_delay(500);
 gpio_set_value(onewire_gpio,1);
 w1_delay(60); 
gpio_direction_input(onewire_gpio);