298.666 MHz frequency counter · STM32F103C8T6
BENCH INSTRUMENT · FREQUENCY MEASUREMENT · PROJECT REPOSITORY 298.666 MHz frequency counter STM32F103C8T6 · TIM3:TIM2 32-BIT · ETR/8 INPUT · SSD1306 I2C A 298.666 MHz-class frequency counter built on one STM32F103C8T6 “Blue Pill”: a 32-bit hardware count through TIM3:TIM2, an exact 1 Hz–36 MHz companion generator for regression work, and the author’s VHF/UHF FM transmitter circuit used as a lawful, controlled test source. Read this before the numbers: 298.666… MHz is the synchroniser-derived display ceiling at the default 112 MHz TIM2CLK. It is not a promise that every clone and every waveform counts accurately at that edge. Above 224 MHz the firmware marks each reading MHz EXP ; near the ceiling the margin disappears and a rejected gate is the honest outcome. Verify against a known source. PROJECT POSTER · A2 portrait ...