stm32f4 i2c 问题
我用f429的i2c连接外部RTC。读出来的数据前两个字节是对的,后面的都有问题。如下图,第0字节的数据会影响第4字节。当buf = 0x10,buf = 0x12;
buf = 0x18, buf = 0x1A;
有人遇到过这种情况吗?
硬件I2C 模拟I2C都这样
。data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAM4AAADCCAIAAACOv2roAAAKhElEQVR4nO2b347UNhSH87q8AU8y4pKrUvWi4gYVtVILVKKthIS6SBTKSi3a/lEXqIYty0Rl0fQCms3Yx8c+jn18kvysTyjj8Sa2881xHJvu7Ozs9PR0u93u9/uTk5P9fr/9P12/fv3KlSt9v//A1Wu3zs7+3m5fvnr1Z9d1p3+dnPz69NnjB1ev3RrKDHRdR34c5/uZzl9VZbvdkvmhOnSHKfFP0s8TOk650CzoRKr99vzp8ZOHTx790HXd4x/vHz248/D7rxamGlkN3q10M1LOs0jPeqlqRw++uf/15/duf3r39o27t2/c+eKTb7/8LKRa1Cqzqvk1aa7a3D3rRardvPfo6rVbPjfvPQp1TWi4cfrUoGp+ZZxRz2mg/9NiRlv/PKGL6ndLPQSqLYyoam3uxyKsopsG1Yzgx7+FAdWAEnHVtkhIJRKiGlACqgEloBpQorpq02dV0jMklodqytRSreC8XXSq9MILUG3fdcO/9qm7WlCmilAtQEi1fdd9oFJ+HrI10D2V/DVQcuFlvJIzLkb+ob9+GsrnyzBEVbMTLUI1WbJqFxfv3r//yMXFu4uLf3dv/+F3dpBiOcfOAfOHofKhkzDwqjH9Pv5qnDP+KpSffh6nAqL7vQTVdrvz3e58t3uz2715+/bN6+2L35//nK6a/y1jiSi/rGrRzvU9GEsWzSfPEzpOr5Vz3Xmrdn7+2tmz8Muzo4KqOckvHD3hdNWY0YoMSPyfpJ8nqhqTn6jInFQbduG+fPFH4i7c7KhGFo6esFJU491KNyPlPBM965eh2rAL96ej7xJ34RYZQPnyTAhkED2rNVdNdL+XoFr6Ltzhrqer1gtnoP1IsuKqkR6Mu374NzQaMqOtfx5eKenNVlBNGnr3XVfrvZp9bL5XKxJCZh/VFoY11QreVJtkqpY+TpnFmmqLB1sjkZQSohpQAs9qQAlENaBE46jmr0ExH8sC1ZRpHNUS3+vWaDmjmvR9ks57qbnTPqqJjgsSUs156R89T6i89DyLB1HNpZRqoTKrBVHNhVTHWbUcD4tQLZFJUY3/N+nyM1Et43jIgWcfQFRzYdQJ7dQIlY/mrwo8q7lAtUogqrmUGkAxA3UwFNX68P7HGi0XvVdjpgVkDp+/TgxFtSllMsBqgTK2olrVazlANWXaRzVmlRNroEsCWyORlBL2qwElsF8NKIGoBpRoPwMl/4Nx6NuCQDVl2s9Ax8ekWPqqZShOFq76U5kd7aNaRk4RQqpJ18RSfiGwrTcV1dJzilBKtZRqQ7UeUY2v0nA8Dl2JC7VQze0QRDXmcumbTfCsFsXQLlzRXZxOxgDKqIOoFgVRjasSVCsIntW4Kk0ZQKGa2yGIamStnOjFTAu6w8SfZ82Yi2r1ruWA1QJlzEW1vDIZQDVl2kc1ZoipOgBBNWWwNRJJKWG/GlAC+9WAEohqQIn2M1DyHRX5sSxQTZn2M1DRcUEY1TIUZybRtW/hXGgf1UTHBQmpJr10yEssFbgdYieqhfKNq5bekJVjKKqFMi2oxqyB8pWEapddgf1qzOXSx3SoFsVWVEsJcqXIGECZxy+oFsXQs5ry3YJqyhiKasZVwwA6EVtRbZxq3y3RezVmWsBUm8xfLYai2pQyGWC1QBlDUW1KmQygmjLtoxozvlQdfaCaMtgaiaSUsF8NKIH9akAJRDWgRPsZKPmOivxYFqimTPsZqOi4IIxqUsXJ8niF6/ZS86gWzVdWTXpp5V/IfDEU1UL5UG0ZmItq5EhUo+Ui1cbjoP9Ayf8t+NghiGqJl844xoPaQcda24XL37+CZAygocd/UXNWC6Ka4NJQbQqGntWUH3oUBtDaTZgXtqJaNGwURPRejZkWhKrN5K8TQ1FtSpkMsFqgjK2oll0mA6imTPuoxgwxVQcgqKYMtkYiKSXsVwNKYL8aUAJRDSjRfgYaeiPFfFsEqKZM+xkomdlwtaCXK45XuEm91DyqkTkGF6ZSmoCFKa6jrEW1xahWo7tmja2oNny0phqzBgrVEjG0X0159JFGteyqwrOP/WAnqnWHqfatyhhAycd8vqrw7LIrrD2r+fnzVQ2eHfSGnagWyjeiWpHBdM0gqtFX9wfx0LSAzBln+l+tE6NRTVomA6wWKGM0qtW4lgNUU6Z9VGPGl6qjD1RTBlsjkZQS9qsBJbBfDSiBqAaUaD8D9d9XMW+wCgLVlGk/AyWPQ2UKwqgmVZwpj/e3l13RPKpFz2lkYSqjCZDsoDcQ1TKqlFIenrkdZSqqhRYTa7RcpBrzBAnVEjEa1RTumTSqZRxXndbMDkO7cEP5RlTrhfvVEOHcjrUT1UL5UG0Z2HpW07xPCgNo7SbMC1tRzcK0gKwGMy0IVZvJXyeGotqUMhlgtUAZW1Etu0wGUE2Z9lGNGWKqDkBQTRlsjURSStivBpTAfjWgBKIaUKL9DHT84M9/LAtUU6b9DFR0XBBGtQzFycJ4hXvQG82jGn+3mPyJhFSTWs4sFdRuwrwwGtVqXMuhlGqhklDN7RBrUa35GiipCL8GSlYSqrkdYme/mjMhqH2fpFGNrxKe1aKYi2r8cUEyBlBGHUS1KFAttUo9VJsGVCtTJagWxZBq/Ty3RnaHKdqc1WJLtewyGWC1QBmoBpRorxozxFQdgKCaMtgaiaSUsF8NKAHVgBJQDSihqhr/gE++BWXeWvllRJWBaspYV43PmfKyl1TNl9vOC9jpNcloTsHmW1FteBEfLT9+TT+la0JRTWetomDXVTpP8V9aLdXGVXTkIBtQSrV0ElUzgr5qxXtDWzVSlJRj8mxTWh5VzanJUHmnFWT++KvE8tL7HRrl+dF/RarxBZhj/mwZMKox94kRcZzP3+PQedLvdygnWnLVqnVUYtqpoFr6DU4vGf0JJXbmxJqsXbXQ32aolt41Gc9qUG0K1VVjBp1ol0k7TtQvGTNQy6qtdwDtR5JNUY0cWP2rON/6V/T/VvReLVQNpnrkV9HmpN9yaZWkl+bLh87A5GNhah6IvLQJVJsNc7cNqgElsDUSSSkhqgEloBpQAqoBJTRWC0Tl1eZZUE0ZE6rpe9Zja6TWRS9PBdX4mhtRrVQ10s9T/JdWVzVyeSRUxikcWl0p1e+JqhlBX7XivVFRNdIwPjMU3hz/irQ8qppT1eHS5O+BbDLz+xG1hSxGnp/JZ04lvXQeSgNoQdVKtZxRjblPjIjjfP4eh86Tfr9DOdGSUI04CEWFUi0XRTX+6ukq5LWiYE2gWnzPT/GWZzyrQbUpNHtWI2OVkQE09NGyamsfQMmHniGHN8wfPcu2XPRejRzNmfzQV0x56S2XVkl6ab586AxMPham5oHIS5tAtdkwd9ugGlACWyORlFJcteOFpi2imrWo1lqJWgmqQTWlBNVWp9pms3EO+GKlElRbr2pTimWICNWWptpmsyliCVSbO3VV8z3bjJJjybgkU+zYE8spmZig2nJUIz3zP/LOMcWYM6ckqLYQ1cgww1uSIlNIKahmn5ZRzcmMqsaMklDNPqrPatOjWvTb9ATVFqXa8aFtRZ7V/AJkTjRBtaWp5jsxfQbqfzxOFndIUG3hqtlJUA2qKSWoBtWUElRT5j9V0nAPqDGKNgAAAABJRU5ErkJgggA=data:image/png;base64,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
用示波器看一下波形,然后分析一下数据。。。在看看资料。。。应该没啥大问题!!! 看一下读取的过程,我用F4的硬件I2C读取RTC正常。 把波形测量看看吧。
还有,这个第0,第4字节代表什么意思?看看数据手册?
你这样问问题,神也无法给你解决的。
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