当你调用这个函数时,你需要提供一个指向I2C适配器的指针、一个指向I2C消息数组的指针,以及消息的数量(msg_num)。 针对你的问题,“linux i2c_transfer msg_num = 2 发了几条i2c指令”,我们可以从以下几个方面进行解析: msg_num的含义: msg_num参数表示你希望在I2C总线上传输的消息数量。每个消息(i2c_msg结构...
int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) { int ret; // 保存传输结果 /* * 这里存在一些故障报告模型的弱点: * 1. 当我们在从设备接收N个字节后出错时,没有办法报告"N"。 * 2. 当我们在向从设备传输N个字节后收到NAK时,没有办法报告"N", * 也没有办法让...
if (i2c == NULL){ MSG[7]='n'; //System_abort ("初始化 I2C\n 时出错"); } 否则{ //msg[7]= I2C_transfer (i2c、&i2cTransaction); //System_printf ("I2C 已初始化!\n"); } /*指向 T 环境寄存器并读取其2个字节*/ txBuffer[0]= TMP007_obj_TEMP; i2cTrans...
我已经确定,对于这些操作,我需要使用i2c_transfer()和一个i2c_msg数组。我以前从未在内核空间中编写过,我需要一些关于如何在我的系统上获得加载的i2c主驱动程序的“驱动程序实例的设备结构指针”的指导,以便我可以从用户空间调用i2c_transfer()函数。下面是我在网上找到的一些关于如何使用i2c_transfer();https://docs...
Thestruct i2c_msg *msgsare currently modifiable by the device drivers, which may alter/correct them before transmission. __syscall int i2c_transfer(const struct device *dev, struct i2c_msg *msgs, uint8_t num_msgs, uint16_t addr);
...BUS,或称为I2C Controller 里面有2个重要的成员: nr:第几个I2C BUS(I2C Controller) i2c_algorithm,里面有该I2C BUS的传输函数...内核里怎么传输数据使用一句话概括I2C传输: APP通过I2C Controller与I2C Device传输数据APP通过i2c_adapter与i2c_client传输i2c_msg...内核函数i2c_transfer i2c_msg里含有addr,...
@@ -718,16 +737,6 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) goto done; }/* * We must disable the adapter before returning and signaling the end * of the current transfer. Otherwise the hardware might continue ...
No message missed by I2C b4 HOST_MISS_MSG 1: I2C did not read RF message before watchdog time out 0: No message missed by RF b5 RF_MISS_MSG 1: RF did not read message before watchdog time out 0: No message or message not coming from I2C b6 HOST_CURRENT_MSG 1: Current Message ...
I2C_bus_WrRd Time:3763ms I2C single IO test: 0x065D I2C single IO test: 0x0677 I2C single IO test: 0x2012 I2C single IO test: 0x2007 I2C_xfer Time:3254ms hdl:4 msg:1/4 addr:0x70 bptr:0xBEACDEEC len:2 flags:0x0001 buf:0x8660 hdl:4 msg:2/4 addr:0x71 bptr:0xBEACDFEC ...
* @msg: List of messages to transfer * @nmsgs: Number of messages to transfer * @return 0 on success, -ve on error */ int dm_i2c_xfer(struct udevice *dev, struct i2c_msg *msg, int nmsgs); /** * dm_i2c_set_bus_speed() - set the speed of a bus *0...