STM32F429 based simple square wave generator source code, you can achieve the adjustment of frequency and duty cycle. Can be run directly on the atlink Appollo development board.

signal\CORE\cmsis_armcc.h
......\....\core_cm4.h
......\....\core_cmFunc.h
......\....\core_cmInstr.h
......\....\core_cmSimd.h
......\....\startup_stm32f429xx.s
......\HALLIB\STM32F4xx_HAL_Driver\Inc\Legacy\stm32_hal_legacy.h
......\......\....................\...\stm32f4xx_hal.h
......\......\....................\...\stm32f4xx_hal_adc.h
......\......\....................\...\stm32f4xx_hal_adc_ex.h
......\......\....................\...\stm32f4xx_hal_can.h
......\......\....................\...\stm32f4xx_hal_cec.h
......\......\....................\...\stm32f4xx_hal_conf_template.h
......\......\....................\...\stm32f4xx_hal_cortex.h
......\......\....................\...\stm32f4xx_hal_crc.h
......\......\....................\...\stm32f4xx_hal_cryp.h
......\......\....................\...\stm32f4xx_hal_cryp_ex.h
......\......\....................\...\stm32f4xx_hal_dac.h
......\......\....................\...\stm32f4xx_hal_dac_ex.h
......\......\....................\...\stm32f4xx_hal_dcmi.h
......\......\....................\...\stm32f4xx_hal_dcmi_ex.h
......\......\....................\...\stm32f4xx_hal_def.h
......\......\....................\...\stm32f4xx_hal_dma.h
......\......\....................\...\stm32f4xx_hal_dma2d.h
......\......\....................\...\stm32f4xx_hal_dma_ex.h
......\......\....................\...\stm32f4xx_hal_dsi.h
......\......\....................\...\stm32f4xx_hal_eth.h
......\......\....................\...\stm32f4xx_hal_flash.h
......\......\....................\...\stm32f4xx_hal_flash_ex.h
......\......\....................\...\stm32f4xx_hal_flash_ramfunc.h
......\......\....................\...\stm32f4xx_hal_fmpi2c.h
......\......\....................\...\stm32f4xx_hal_fmpi2c_ex.h
......\......\....................\...\stm32f4xx_hal_gpio.h
......\......\....................\...\stm32f4xx_hal_gpio_ex.h
......\......\....................\...\stm32f4xx_hal_hash.h
......\......\....................\...\stm32f4xx_hal_hash_ex.h
......\......\....................\...\stm32f4xx_hal_hcd.h
......\......\....................\...\stm32f4xx_hal_i2c.h
......\......\....................\...\stm32f4xx_hal_i2c_ex.h
......\......\....................\...\stm32f4xx_hal_i2s.h
......\......\....................\...\stm32f4xx_hal_i2s_ex.h
......\......\....................\...\stm32f4xx_hal_irda.h
......\......\....................\...\stm32f4xx_hal_iwdg.h
......\......\....................\...\stm32f4xx_hal_lptim.h
......\......\....................\...\stm32f4xx_hal_ltdc.h
......\......\....................\...\stm32f4xx_hal_ltdc_ex.h
......\......\....................\...\stm32f4xx_hal_nand.h
......\......\....................\...\stm32f4xx_hal_nor.h
......\......\....................\...\stm32f4xx_hal_pccard.h
......\......\....................\...\stm32f4xx_hal_pcd.h
......\......\....................\...\stm32f4xx_hal_pcd_ex.h
......\......\....................\...\stm32f4xx_hal_pwr.h
......\......\....................\...\stm32f4xx_hal_pwr_ex.h
......\......\....................\...\stm32f4xx_hal_qspi.h
......\......\....................\...\stm32f4xx_hal_rcc.h
......\......\....................\...\stm32f4xx_hal_rcc_ex.h
......\......\....................\...\stm32f4xx_hal_rng.h
......\......\....................\...\stm32f4xx_hal_rtc.h
......\......\....................\...\stm32f4xx_hal_rtc_ex.h
......\......\....................\...\stm32f4xx_hal_sai.h
......\......\....................\...\stm32f4xx_hal_sai_ex.h
......\......\....................\...\stm32f4xx_hal_sd.h
......\......\....................\...\stm32f4xx_hal_sdram.h
......\......\....................\...\stm32f4xx_hal_smartcard.h
......\......\....................\...\stm32f4xx_hal_spdifrx.h
......\......\....................\...\stm32f4xx_hal_spi.h
......\......\....................\...\stm32f4xx_hal_sram.h
......\......\....................\...\stm32f4xx_hal_tim.h
......\......\....................\...\stm32f4xx_hal_tim_ex.h
......\......\....................\...\stm32f4xx_hal_uart.h
......\......\.................

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