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lanchpad with G2553的I2C 官方示例msp430g2xx3_uscib0_i2c_09.c



下载后用示波器检测两端口波形,IAR调试状态,刚开始SDA SCL 都为高电平,运行UCB0CTL1 |= UCTR + UCTXSTT;   产生一个开始信号,SDA变低,但是后面为什么SDA就一直为低,而不发送地址呢,而且SCL上也没有时钟波形(一直为高)?

1.6连接的led 跳冒已经取下了,端口也加上拉电阻了

求各位指教