I should combine STM32F479 with PROFIBUS-DP ASIC SCP4-2 The chip is aged. And requires delay of at least 30ns (by 3v3) between address and cs. Our previous design was based on SAM4S and their CPUs are offerring register to program such delays. In STM...

STM32F4xx_DSP_StdPeriph_Lib_V1.8.0stm32f4xx_i2c.c : 451void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction){/* Check the parameters */ assert_param(IS_I2C_ALL_PERIPH(I2Cx)); assert_param(IS_I2C_DIRECTION(I2C_Direction))...