i2c timing配置

lindahnu

看了工程示例i2c_timing_utility.c，函数I2C_Compute_SCLL_SCLH里面有个条件标注： tLOW(min) <= tAF(min) + tDNF + 2 x tI2CCLK + [(SCLL+1) x tPRESC ]

我在手册里怎么没有看到呢？

eric2013

下载I2C的规格书看，ST的说明如下

For I2C peripheral version I2C v2 and I2C v3, the I2C frequency must be calculated using the system clock and the I2C control register based on the I2C timing. The BSP specification recommends insulating the bus frequency from the system configuration. Thus, a static service is added locally in the BSP BUS driver in order to calculate the timing field from I2C frequency expressed in Hz.

lindahnu

发现调用i2c_timing_utility.c里计算timing的值和用工具CubeMax计算的值不一样，下载了官方一个I2C_Timing_Configuration_V1.0.1.xsl，控件计算的结果也是和工具CubeMax一样，是不是i2c_timing_utility.c有误呢？

eric2013

lindahnu 发表于 2021-7-15 09:11
发现调用i2c_timing_utility.c里计算timing的值和用工具CubeMax计算的值不一样，下载了官方一个I2C_Timing_ ...

没用过硬件I2C，帮顶。