STM32F103 SPL Tutorial 5 – SPI Interface

STM32F103 SPI

STM32F103 SPI (Serial Peripheral Interface) is a synchronous serial communication protocol. In this interface, in addition to transmit and receive lines, there is a third line that is used for clock line. Each slave device also has a chip select (enable) pin, that is used for activating the device. So to use SPI, we need 2 wires for data lines (MOSI, MISO), 1 wire for clock line, and 1 wire per device for chip select line. MOSI (Master Out Slave In) is used for data transfer from master device to slave device. MISO (Master In Slave Out) is used for data transfer from slave device to master device.

SPI bus

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STM32F103 SPL Tutorial 4 – Create a Delay Function with System Timer

STM32F103 System Timer

STM32F103 System Timer or SysTick is a timer inside the CPU. SysTick is a basic countdown timer. SysTick can be polled by software or can be configured to generate an interrupt. To use SysTick, we must load a value to the reload value register. The width of reload value register is 24-bit, so it can counts from 0x00FFFFFF to 0. In this tutorial, I will explain how to use SysTick for creating a delay function. SysTick can be configured through the registers below.

SysTick register

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STM32F103 SPL Tutorial 3 – GPIO Read Button

STM32F103 GPIO

In this tutorial, I will explain how to use STM32F103 GPIO for reading a push button. STM32F103 GPIO can be configured in 4 different modes (input mode, output mode, analog input mode, and alternate function mode). For reading a button, we need to configure a GPIO pin in digital input mode.

STM32F103 GPIO input

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