Daily Archive: May 18, 2014

STM32F4 NVIC or Nested Vector Interrupt Controller 33

STM32F4 NVIC or Nested Vector Interrupt Controller

Interrupts are important in microcontrollers. WIth them you are able to stop executing main program and jump to some predefined area if there is something important. I already used interrupts in my USART library. There is an interrupt called each time data arrive to MCU. Defferent peripheral can trigger interrupt, like data come to USART, ADC finished conversion, timer overflow, and more more. NVIC NVIC or Nested Vector Interrupt Controller is used to dinamically tell which interrupt is more important and...

Library 14- Working with SDRAM on STM32F429 Discovery 52

Library 14- Working with SDRAM on STM32F429 Discovery

STM32F429 Discovery board has external 64Mbits or 8MBytes SDRAM chip ISSI IS42S16400. STM32F429 has a FMC (Flexible Memory Control) peripheral to driving external SDRAM with hardware. FMC hardware is able to store up to 32bits variables at same time. External SDRAM capatibilities Variable size Max value Max address Max variables stored 8bit 0xFF 0x7FFFFF 8388608 16bit 0xFFFF 0x7FFFFE 4194304 32bit 0xFFFFFFFF 0x7FFFFC 2097152 Note: This library does not work on STM32F4 Discovery, because this MCU does not have FMC peripheral....