一、I2C ACK error 在应该收到 ACK 信号的时候没有收到 ACK 信号,i2c controller 就会产生一个 ACK error 的中断,告诉 i2c driver 发生了 ACK error。通常情况是 slave 本身的问题。 1、检查 device 是否存在,i2c bus number 和 device address 是否正确。示例如下:i2c number 为 6,addr 为 0x28: 复制 [...
u8i2c1_send_Nbyte(u8address,u8*p,u8data_number) { u32time_count=0; u8irq_state=0; irq_state=parameter_control1.control_bit1.cpu_IRQ_state;//中断状态 close_cpu_irq();//关中断 while((I2C1->SR2&I2C_SR2_BUSY))//判断总线是否忙0总线上无数据通讯1有 { time_count++; if(time_...
* @num: Number of messages to be executed. * * Returns negative errno, else the number of messages executed. * * Adapter lock must be held when calling this function. No debug logging * takes place. adap->algo->master_xfer existence isn't checked. */ int __i2c_transfer(struct i2c_a...
// 打开i2c控制器 handle = I2cOpen(m_i2c_number); if (handle == NULL) { PRINT_ERROR("I2cOpen failed\n"); return -1; } if (m_i2c_flags_read == 1) { // 读操作 // 设置msgs数组有效数目 msgs_count = 2; // 初始化msgs[0],该部分为主设备发送从设备的i2c内容 msgs[0].addr = ...
Problem The smbus instantiation logic in i2c.py selects the wrong i2c bus number for CM4 Pi. This presents itself in the form of an uncaught IOError that crashes a python script when any of the adc methods are called, for eg: >>> from gr...
* Returns negative errno, or else the number of bytes written. */ int i2c_master_send(const struct i2c_client *client, const char *buf, int count) { int ret; struct i2c_adapter *adap = client->adapter; struct i2c_msg msg;
printk(KERN_INFO"register device number error!\n");returnERROR; }/*字符设备初始化以及注册*/cdev_init(&i2c_cdev, &at24c08_fops); cdev_add(&i2c_cdev, devid,1);/*创建类,它会在sys目录下创建/sys/class/at24c08_class这个类*/at24c08_class= class_create(THIS_MODULE,"at24c08_class");if(IS_...
Unfortunately, many currently deployed networked devices do notinclude them and may be vulnerable to Random Number Generator (RNG) attacks.Since most o... M Fabbri,S Callegari 被引量: 0发表: 2014年 基于PCI安全标准的终端设备SoC设计研究 put forward and realized in the paper to guard against ...
number_of_page = number_of_byte / I2C_PAGE_SIZE; number_of_single = number_of_byte % I2C_PAGE_SIZE; if(write_address+write_address>EEPROM_SIZE) { return EEPROM_ERROR; } /* if write_address is I2C_PAGE_SIZE aligned */ if(0 == address){ ...
* the specified bus number. * * Systems using the Linux I2C driver stack can declare tables of board info * while they initialize. This should be done in board-specific init code * near arch_initcall() time, or equivalent, before any I2C adapter driver is ...