# I3C

Source: [https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html](https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html)

I3C 接口旨在为连接的 I3C 目标设备提供快速、低成本、低功耗的 2 线制数字接口。I3C 接口用于改进 I2C 接口的功能，保留向后兼容性。2 线制串行接口最高支持 12.5 MHz。传统 I2C 设备可与之在同一总线上共存。I3C 总线支持带内中断和热加入。同步时序支持异步时间戳。

在写操作期间，转换位为 8 位数据奇偶校验。在读操作期间，控制器使用转换位来决定是继续处理下一个数据还是中止读操作。START 条件后面的地址为开漏式（仲裁阶段）。重复 START 条件后面的地址为推挽式。数据阶段既可以是推挽式也可以是开漏式，具体取决于目标设备是否支持 I3C（对于混合总线，I3C 控制器可以寻址 I2C 目标）。下图说明了 I3C 硬件和软件实体。

Figure : I3C 框图
            ![](data:image/png;base64,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)

I3C 架构的主要特性如下：
- I3C 控制器驱动程序软件 – 软件特权实体，可进行枚举和总线配置。
- I3C 客户端软件 – 使用 I3C 总线对设备进行读/写操作的软件实体。

### I3C 数据包帧结构

帧以 START 开头，后面依次为命令 (8)、数据 (8)、转换 (1) 和 STOP。
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m/2hTjnxAZxD2Swd3zvC+d/YIdN2vF+HOfcdP3VxzX5IvqyVtIMIV9AP2K4+c+F4erPXnWLwSARFzVYOv9492DK/1I2IJLAaCEP7Y5a6i+r/L/YEBoaY8KAsI+GH0fqLAfDJLf1nfwpeFLa+0ZMsACHgh1CsJ0j4dCHSmlx+VVO574SCOqSwlR2AeYpKZGghT2AwLbLXO2gbjN35wGoxFj85xiNWv2aUNbQOWAnfiQC6JCgRf2Aen7AM9XQYE24dA1vp0PIokU2NkcBeeFwPZnE1O9SwfN8VgvRk3fV4kdYR+Svg/ReAwIi9GmFA4HpZKwvp1PIsFGcry4205+bzHUf+ucxPs9e8/Ykz5SO6I2AyzsA5NHpiU0YX8L4MqNe+9fPAPqgeLIXT6HQofDZIuU0TOnifJcJ/Uum5siP2xhJPNDgwf6PjRhX/GIwNL3RVMllX7Y7gYqD0Y1emCXXv73ZZ1TqmaPPutbmy50R4juc1vUWFPbgxb2oen7EIX9QOFlFUfsyyjZ3332cbyI4iNfz2ZrXErHRzw51nih7yMu7Lt7JAZAtuWKyxltquBAu5UIaX5V7dnAxLHonXrps9+n/UjQvrCRTdicStJ5/Sy6eLnNF5iwD7mUsIT9AHHyuooFh/zxWXwAbdT8Wqn3O+varbKWiBYumWHst0WkxLRwyOy1b378VpWJ5x8w/Vw/vPR9OR+5BxhI+xGSsB8kaCMJU45WQBgpggKlFOtATuLBOmDsS2qtNCiaoFTJiDv1YHfrFK9dPPupkC5Ivrxomv9fwq5L+SyOn5uJ3lvm+4MNYV9Q+r5stV5wkADIbxlwKA12/qNSzYn2o12zlcDl2LnzZ+yUX5hV8/j1PK7s67KjeSkvcld2VPFG3wcl7AuwdANFKZ4gEPH9wByTjkCUcmZD2Aep78MT9sPpftPe6PvoCvuovYWUDrTp7jPMW2BOupEghX2g+j4UYT+k4rW+D17YF8dR8Ms1HTIOqXis7/eAhH3gv2Q2gXF+CCHKfeU9oqTvq4Rorhh+2poiCULYR5PiIE52Yx8Qm00gnPT9brBxGHDA+j4EYR8MceY5N2GBKT7fA6g4KqHcsSMAjIryhL86Hr2XrxqnNEzAHekesL6vcK1edVoJ/+MzY6gddQRISdGXrvd1Z8Egu/ty1LY5qF4VAyxU+68PvNWd+52H+j4wYR+2vu97YR+FtIHdHNXiH1RxCUrIDefxxP4+kd3DMmd4fFWeiOLIoLkscU5vd3p+yG4EI31fbYmSkXvpi0nfNwr7SPBxHHXDxwUBnEczF7PZo8/259FuJf0oryvfCGDbT5xK+cmqnyO9zXfvXNgXx1HwC/1SRQNz9eMBQNym1FCOnq2P9erjTjBYXMKXr4s7S329jgeg3T1gTIOKeqxn9t6WgWZLXwv7IybSgoD96HdhH9Ri5yd8993e/siqd9o1ECze7Rw9Bkbi0rm5aO6QJKnbDY55V942iL/1/dKOsA9e3wcn7Pv3ambsAj/70CMWz/SLk4uNA8J2txW3LYEPv4UWm4XexigoL+h2o3Y3D/X9Ydf5NIWmiJkxKW3a+TP7gaIOFJQ64XZ6nAlxTeLo+IbP872ezwsuXxnxuqPtbkHBG1nx2pY4OQIWk02SdrOSgmh54Qbdb9IrQLSO/Jm8plnKiKQaaNhE/syBaCzR4Htng1+e9bam247yNuuGn5fjeGyWNwUjL2sUUwV01HYYBQaQzXGsoh4bsi4iTT4NLpVZbs8C+TY67xgPzvtp+EWn0FX1f/01ELHmFwDA6S11xkB/9WzThkxO4ta32abMqJSk9W/29wARznpdFb0euLziNmGXHpvf70ftNmAslY8j2V8Ft9sXE66J3h+YOI/dDgVtHnrK0ZXHpNf1/lg/YSCo8LXgdLLNac41VOaIgztgclWikntpns8DSkFGYekm0HRAO+FJn9TGehMV+511Bzjx4dMhrg4FqcWjUI6mW8T6ew5ZzhYsvi/gACeeTu2i9+vq7w9i+00fAILDvEIWVD93LHSA4+eOiZPJxAcssvDNovd+f8AlBuD6uc9h/P8X8UO3P+gwx+GLEZ23W9SF74tF3h+CbjzHYLsbpvNOvB+zXbs4vNLHy+o8pxUpOVvt125vX3dlazDKOn0oZy/VS2FbjcnMzNLxWLgQKDEZsmBm5pysMzGwphFZMrOsaUTS8I02HixLMTNnZJ0pMzOXZB3j33g7sk4kTvrqKJ0ykHWVISPHYmMw1ahIDt3JKkOMd/LKFMuxqBH9m9kZS9ULk5X1AFajB+WXbWz3AzbK2ezpY6+c+M+J/5x8S3GckEMn+BINwQqKnIt6YBS0bWLqBV+y71sZCF/yJXdqBcZTcApcXsxhc2qAX6JDC1KKfABoE4lDfkkdOrAfnAe6yuUd1gSJQ2axhM3lhE1RHBkjpkXdDbgtzLRsY3cAeG3C6bSjYxKEZQIpF2rBTsjtlfDlqlNOCXBZxGQYesVS4rKEoG4Krwac3hbQuBRMkrAsYtOKPvfpZmj9fveI2OTfWV5elhApkO3tA27ymY7dDKg77HhRc01A39fx2rC5URy4dBkd07YS4/036toMKyaIAXbFQFlhx6++uzvKHVZnHAbajCpBSAuXGvZOsXY14p/OtgmXl0L1J9fdWfbQRUYJwUcXCZeXUv3qEtoz5IBo/zoBzBO7/f8UxzYt2Cb2tCmQfvjhe9Tcty0BwGb+dyivV+5PAMA2o2+Om7J7sgXIb2Hr4okVt+OgDexm6bJXnwEo4bdhU8h2revLbj4juzbP4g2dB4Cx/pzyav5bsbGPUUJhtGAtFxd7ZVpovOnhs9u8mZ9nWGTK6RXv+DJjop/OKBK3eDasgW9Au1U6fbERXLKx2tN18V+L8l7si9PLLuj93kh/dY//4b9SCotfspmeW/DPbGGX3Y9H4GabTfTH5KG7U2f7/4nbolp8fj5Us1+EdLwKBwDtg/FfobxG5ggAl+fbzYqaboU/GhO0Y+sGtTEu2N4SS8NyK/+Buquk6ce8houmu31nZvPhc+6R3srPP///8LMb31Lfln9lflXK5/8/WaVQJ9guLBUFN+DqrLQLC+2Wr5O9eZd27cKXdgAWztDIDPudbKFK4Us7/iWS37vmMpU29PhLRVXM+6kElOu3/rpXSj6990v58/Vnuqk/GG7A6xM7cQLSZuMaU9SIHdHf+YKlpS/NML22pXbkMdJF3d5LB39Kq98MXbZbHvgH9SN2Mb8vfCXZGr0b9j5Z17p9UQTr1WdVApuw/5+oLVkPn6+PAID99v5SvNdAxbHp02Xv4Wod6rg6qilUT4YMkN0nUXjU9ENTp3/+Wuz/pnNarjW/q8b8uRuxX/CDzlp6/PZv/JXf9ljkvMWtOS7mVw/rt9TdHxZoE/anYhpwwcoUg/0s3tTy33+BLtKArle+XfzaDMPi5cthkZd6LiHeyeKu3cNqm+nAILBppmsa1BVHejZZuJyNBm9eggHic7zdQ8aR36c9JdTvBdD6NkUBcb8eCgASWd/P1s98PPtWqE6/SahWRbGePV/PJtF/fhQArDo6e2g3MA9gbJ+/GHq5S9dvK+Ma10FxrFod57wt+3tg/8TI7ls3Z5iIj3Bjf18VBhldMftAfVjqjIYSfpvmvJDz6rfWBEQ6hcZyjIdqJnjXtAdZzXOO65ht80xkj2x9/L58bpLiLIkLAgq1xee86Cz9cLX55dOpwaYY0tTghRW3dH0v4StqU2iiRnvuCI4pmzFkwLypU9+WqEDWu/z7X0JH7U6cralZQopBH87FZ7yk+z1Fj5jmO8VVnmzRUC6LRxt7djOI4mq2S5x1F7Iln/rdGY5cnWgghSXXj8aubEgQFM/XHuz72fr8iA4A2uLY8nPJy3xPXYOlfotNon8W69FViiMDW4yIfVm+nwBGdv+1p7PseIOMX0al/H+aZC+9vWqkxhImhwRIAK3Zjt/hM/0WSvUoy5aglBKInpZuBjCKJHSJ935aP4M/88qfftXSo0fPd1q2RQ0WgA+hpclCV7cGGrqUP4BxxEENCJWcYoVmQcB2w9BCDjMtiWUCfF2OX4QsRhFvRYNpyBdKhQTUTkk3vs0Ql3cpjIo5LNsffZOj3Z1XML9H+fOv7+3tRp9iiTWtuSbY5qizwu9RxAMZHZ/AB8kzXbtZFnNp7k+U8Ddo/pjq6OnizWrbbLYjziP9WKQfvjR46bYzE7dgtVn7YNIZDcQ/LzgyHzf1FrwVGW3lXPx+P2pxuG7Bk9jDpijhj9W3wKyuke86Vw9JG5Y4Y4urkxF8otR7mpA8+X4ORV+aBL0NGjHMFbMnaNNSB8c2r2i+x2ygywtsMiI/fV/rYIurflvXdY7blIqU6OnmEr483SqnkqQlaFgKgBIa7DZbtWxegrrYrDIgZS6BRHM9S1fCX0+PKqkUaokqkYrRayVPjd+S8iIPf7NsltdCtvh7yZuZku7SzpuF4Uyb5bfzpRTpWi5bRZCJVWiPiuJY4rOYpkrIcS9b5jzv8hPD74qFra+Yj6mpUMqQLCOHJAcb0VKnbrB3Z5pYw/qM1jK+xzfcEkcsBeuJ1Q9SEBUE2/nCaEg/XLPdgyserWv06El5LMGvegN2VX1Mfl/hbCn7K/LRk/EDKOE/9dw8sv/dsrvzX2VeVk19K1afDPQ/bBgbj0mX+Jc2JDJ3F6PXm7XJ59xdyPHP52LQ3KHzGIVtMQ+4eumuGpJrx9Mt6WGRFWcz2SuME7PCTUMVR56L4e5MPd5/yXak+c792Q168fCmLbbMn21+uBK+El7PKE/bB09u6CHQL/wzUj93fOloX4htrHh/hxVbJwNIh/06dqh9M9j8lxb1yO5L1pJKPwMl/Na797jkS+NLnpN25/fnPeKFKIL9Z2DtV/jq7rTy5ysUv1fJr+NgYpt/oDbG7T0eeQTDovjI1gfSj3XuO86rbjXn0JXsngmUy6FwcAQsiDHH/GChrkHFv9YFj8AVkYRlArUsgbnRXgp9E7Zim833cToAbUYuPTcZ168DKOCY583C5U9N0f/hFZP5o6KewZN4rxa3yZzy01dSTde+Tob6DQxx4kjmNUjxqveQXlfRFMqOVSn2Y61IFvOEq0VYvs4qjgxkK7JZhB7CUxAXIyRIeqlhcgz1sYR4RUu6JzdsM3g9/VKFWAj7FTvEALsSgBjTkU0klTnSTd1w+S3PxZDd+nxjBrfOm8dmzn48YKKfUyh1LisqXusXL30JE8ecMbK+R5FwGgnaX5T/QrXA4zXJ1D+vZJPae5YRzNfVVdzZi9qmOYP90ssfANKPrdlm4BUP+X3pecTU4K3A5MqnnfHx5NCXOYRlFLS1Hxev43Tr83bfi8EbZmy9mzJcwu8tXyOZDGDLx+7pLaskQ+pirWqtWwtsMdKHCmWKSmS/ivmoD3+reniwYEjT1o0noE05fQRLnMdcfInrG/L26Ku5DtalaRBWHuCi+p/xUmjDtkn3xTpuikt1l5wcGG7B7DcDlz/1bmsT9eknvemuPh7Dkxpr5HlsW2cJR7tbTE7JnGR/9/Lnr/mYcoj31ma1IZ4yg63Z7tU7mdIBq5btHtml388xpGzhW6ul7NXjPIc+8TBUURxQADSPzD+5YYuBceSlgdUK2IOrJZc0qg2RsJ+fzf4ZS7X7kZ8uzSue3AE5HuO8ubzeLiXv5/9pV8z85vrFZ7p2/+KwFx8TyzyvFNdH4BT1nxJN3ggDCoCFG3hNQUDc9lCDrdp2Lzbn5c0n7uof9IA5YEZh6hIQ1MvuDOuGgXc4pbHC2y5/uRhaN0K25+JENb/yfdYKhjaVP7/pl4up3tsAbJe/Ng0Zwl32f6ptNj+PU1lx1BnRR9g/zcQ4t8jkvjoa+yqWbi7e5+iGtbsZy362VsKXq7Nqd1sXD2+q99DCSzcBwMobcTn82aZof0Y+XVzXPhktRbOP/0fPQ55buyxdBJxe73OoR83u83RC2tMDCHVJDcS40oUbZfWKTe3BknjfNljCfvhLCx3vNwbYFVJaze/YH1rEA823n9xszgpRH+/drZOzNBoLMFEfq1G0rt08N2ONPM4A5c+f5/mn2++A4nDx65DQYUUGvrb48bqw1Rm2u9l/rfgvWQ+X5i+ZB8aubrmVNfqAt/vOG+GoKd7fGFipzhv5GKyLcSCLt6LXyPwDOzRLUvrFsUyup+y2D4pjm90ZMufSYj/SD+/nf9vY6fNXjGXFeow9XUyHvmrjM7+UM+1gMZ1KCV+nFBqQdb038tuUz8Oj3nRRuZHV+uoaNm9bBwAT4zys6YsNNPabsydb7zEF0D5n7wTj6q+OvmqJ7DdgSOzL5tfBZ7p2M6Q33VDCl3lOHtSafVrPoEI1e/TreoF+B/P6/TnmHLOqjZzvSZb2oVDWn9GQwzbMv+ELK0+u983A9Rn7rymODDl1AQ1TKlxeVjcYwQ7wq3e1WBb7O+XrSp1qa359Q8rH4dK4FExSsCxS0wrtkMZ5jzdkrn5BDImM0m2bUpGEZTmRpljZrmTkamiccsF1y1VKsLk1C0TyuageNscvVegjfuWTkFGYLYmUhEADlACpBQN601Nfp6Alrc+Paj9E1PoVfUuwS36uE+3T3YsrQRlFJoIgAVMQd8uVjNx+/5Yz9Ifqao9f+g6OhHr/NNkaDb5boE14qQJy9Wx9DHSena/yRJtqGW3ydGmNaEm/USQu9uD3eNHZcMVRj8MZqNPeoeodn0GSOIWyRAUSGs2GNlQXFKjrn2wb4G6vb/f7fSJMrL5Yzje/sQbXpsSoX9esqFNXuzivoMyR+Ue11BUM5XVlTo+3fxq0X+Vz6FAagAZlJoXOeWFfFpalt1r/oclRzGHTuezL1qAFIfON8/ZNamHI8KlpSyChI6gI5qa98nrW+VmUD20k+i55IrDqcVnVsv0BjL2WFlK8BFhx27k0I8jdHGIYIE83SzgcBjd0ihWvhSZoJycBV2WlnbzDlpCP1kBD0LO9193i8mIJAyUKWUKbUhgKT43yF0YxE9v8OzVnC8gDeFYXwaJjBvqjdQ3Uolc/s/FRiWTtIvPdOHkNWxy7GTZ76Ee90F0J/rPR7rbFtdUTVGaPt3SVj/3jge1uK29EigxnL8GhVDkF1HC2As6NyAT6Yi/AxdT4iGDu1umqZavBMWc6Wt/jbif7Ei7VxU20uagEI0CGri3k07n4eY8IdBGtT37uxEs7J1fDmVb+wKplLkIzkl1ABw8VINiO3BXHEp9HTA1fCkz+fBY92fWQQ3rW/ALsFnGKITmeopkLkm/sprRNCdaAK2AR+LSXSYM61BLeuh6pXufvMLq4wuW+rGsuDxNxsaOxLFsUN1f10P0q/NFI4zyXKkD3V5tWTiLg8FynAxeEXnOJsocgBOlDk80dRqFsVYIF4AC0oZHLJqy4zYWyaEpRD4wvLhg+V31VEm2bBfwxJ4poqrslFx9as03inTl1K05z3kooDQe9EQH7uBmK4wS8hV4sFZdN25Zu6lAcTh+ppDw9MH7iaJ+8IfUhH3vlxH+OlwAA)
其中：
- ACK：应答（SDA 低电平）
- S：启动条件
- Sr：重复启动条件
- P：停止条件
- T：转换位（代替 ACK/NACK）

### I3C 总线初始化

I3C 总线初始化步骤如下：
1. I3C 控制器驱动程序软件初始化 I3C 控制器（固件和配置设置）。
2. I3C 控制器驱动程序软件读取 I3C 配置和设备数据库，包括：
    - I2C 静态地址设备列表。
    - I3C 静态地址设备列表。
    - 预期的 I3C 动态设备列表：厂商 ID、设备 ID、预定义的动态地址以及相关驱动程序。
    - 可选支持热加入的设备（厂商 ID、设备 ID 和预定义地址）。
3. 通过使用 I3C 控制器软件，驱动程序将枚举总线上的设备（设置本地地址）。
4. I3C 控制器驱动程序软件将所需设备和总线特性的相关信息写入 I3C 控制器：
    - 工作频率
    - 纯/传统 I2C 模式
    - SDR/HDR 启用/禁用（和类型）
    - 支持 IBI 的设备和预期的数据字节
5. I3C 客户端软件栈接收有关 I3C 配置和设备数据库的以下信息。
    - I2C 静态地址设备列表。
    - I3C 静态地址设备列表。
    - 预期的 I3C 动态设备列表：厂商 ID、设备 ID、预定义的动态地址以及相关驱动程序。
    - 可选支持热加入的设备（厂商 ID、设备 ID 和预定义地址）。

## I3C 特性

Source: [https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html](https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html)

aDSP/SDC I3C 子系统支持以下特性。
- 地址阶段的频率为 400 kHz。
- 数据阶段的频率为 12,500 kHz。
- 向后兼容传统 I2C。
- 动态寻址目标。
- 单数据速率 (SDR) 模式。
- 符合 MIPI I3C 规范的 CCC 命令。

## I3C 接口

Source: [https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html](https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html)

aDSP/SLPI 软件中的 I3C 用例支持传感器目标设备通信。 
Note: I3C 不支持 Linux 用例。

下表列出了针对目标通信的 I3C 功能的软件驱动程序和配置支持。

Table : aDSP/SLPI/SDC 目标通信

| 文件类型 | 说明 |
| --- | --- |
| QUP v3 串行引擎配置 | 有关 aDSP 子系统中用于启用 I3C 接口的 QUP v3 串行引擎配置设置，可访问以下文件路径。<ul class="ul" id="i3c-interface__ul_v4h_hjr_k1c"><br>                                <li class="li"><span class="ph filepath">/firmware/qualcomm-linux-spf-1-0_ap_standard_oem_nomodem/ADSP.HT.5.5.c8/adsp_proc/core/settings/buses/qup_common/config/&lt;chipset&gt;/adsp/ssc/qup_devcfg.c</span></li><br><br>                                <li class="li"><span class="ph filepath">/firmware/qualcomm-linux-spf-1-0_ap_standard_oem_nomodem/ADSP.HT.5.5.c8/adsp_proc/core/settings/buses/qup_fw/config/&lt;chipset&gt;/fw_devcfg.c</span></li><br><br>                                <li class="li"><span class="ph filepath">/firmware/qualcomm-linux-spf-1-0_ap_standard_oem_nomodem/ADSP.HT.5.5.c8/adsp_proc/core/settings/buses/qup_common/config/&lt;chipset&gt;/adsp/ssc/qup_devcfg.json</span></li><br><br>                            </ul> |
| 固件配置设置 | 有关在 aDSP 软件中配置 I3C 的 QUP v3 串行引擎固件设置，可参见以下文件。<ul class="ul" id="i3c-interface__ul_wpr_p5j_51c"><br>                                <li class="li"><span class="ph filepath">/firmware/qualcomm-linux-spf-1-0_ap_standard_oem_nomodem/ADSP.HT.5.5.c8/adsp_proc/core/settings/buses/qup_fw/config/&lt;chipset&gt;/fw_devcfg.c</span></li><br><br>                                <li class="li"><span class="ph filepath">/firmware/qualcomm-linux-spf-1-0_ap_standard_oem_nomodem/ADSP.HT.5.5.c8/adsp_proc/core/settings/buses/qup_fw/config/&lt;chipset&gt;/fw_devcfg.xml</span></li><br><br>                            </ul> |
| 公共 API | 有关 I3C 软件 API 及其使用信息，参见以下头文件。<ul class="ul" id="i3c-interface__ul_m5h_njr_k1c"><br>                                <li class="li"><span class="ph filepath">api/buses/i2c_api.h</span></li><br><br>                                <li class="li"><span class="ph filepath">api/buses/qup_common.h</span></li><br><br>                            </ul> |

## I3C 软件

Source: [https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html](https://docs.qualcomm.com/doc/80-70014-8Y/topic/i3c.html)

在启动序列期间，QUP v3 串行引擎的 I3C 固件通过 SSC QUP 加载。配置文件位于 aDSP 编译版本中。用于为特定 QUP v3 串行引擎实例启用 I3C 配置的源代码路径为 /firmware/qualcomm-linux-spf-1-0\_ap\_standard\_oem\_nomodem/ADSP.HT.5.5.c8/adsp\_proc/core/settings/buses/qup\_fw/config/&lt;chipset&gt;/fw\_devcfg.c 和 /firmware/qualcomm-linux-spf-1-0\_ap\_standard\_oem\_nomodem/ADSP.HT.5.5.c8/adsp\_proc/core/settings/buses/qup\_fw/config/&lt;chipset&gt;/fw\_devcfg.xml。

向 SSC QUP SE0 或 SE1 中加载 I3C 固件的示例。

    se_cfg se0_cfg = { 0x80000, SE_PROTOCOL_I3C,    GSI,     TRUE, TRUE  };
    se_cfg se1_cfg = { 0x84000, SE_PROTOCOL_I3C,    GSI,     TRUE, TRUE  };Copy to clipboard

**GPIO 配置**：QUP 通用驱动程序中的每个串行引擎均采用默认 GPIO 配置（根据芯片组特定的配置中的协议）。QUP 通用驱动程序根据串行引擎中加载的协议获取 GPIO 配置。用于特定 I3C 串行引擎实例的 GPIO 配置的源代码路径为 /firmware/qualcomm-linux-spf-1-0\_ap\_standard\_oem\_nomodem/ADSP.HT.5.5.c8/adsp\_proc/core/settings/buses/qup\_common/config/&lt;chipset&gt;/adsp/ssc/qup\_instance\_mapping.c。

可按照如下所示覆盖默认 GPIO 配置：

    { .instance_id = 1 , //Instance ID
    .qup = QUP_SSC, //QUP Type
    .se_index = 0, //SE ID
    .se_data = NULL, //devcfg_map
    .protocol_io_cfg = {
    TLMM_MAP(TLMM_GPIO_KEEPER ,TLMM_GPIO_2MA,TLMM_GPIO_KEEPER ), // SLEEP CFG
    TLMM_MAP(TLMM_GPIO_NO_PULL,TLMM_GPIO_6MA,TLMM_GPIO_KEEPER ),  //SPI CFG
    TLMM_MAP(TLMM_GPIO_NO_PULL,TLMM_GPIO_2MA,TLMM_GPIO_NO_PULL), // UART CFG
    TLMM_MAP(TLMM_GPIO_PULL_UP,TLMM_GPIO_2MA,TLMM_GPIO_NO_PULL), //I2C CFG
    TLMM_MAP(TLMM_GPIO_PULL_UP,TLMM_GPIO_2MA,TLMM_GPIO_KEEPER ) //I3C CFG
    },
    .se_exclusive = TRUE,
    }
    Copy to clipboard

TLMM\_MAP 是用于初始化工作和休眠状态 GPIO 配置的宏。以下为 TLMM\_MAP 宏的使用示例：

    TLMM_MAP (active state pull type, drive strength, sleep state pull type)Copy to clipboard

Last Published: Aug 22, 2024

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