1. Use the spi3 interface and refer to the tutorial by Mr. Lu Youliang [BP19_Network PING Experiment]. This code implements this function.
2. The jtag port of stm32 can be configured to SWD mode, which can free up three interfaces without affecting the download and debugging of the program. For how to configure it to SWD mode, please refer to the previous blog.
Configuring the STM32 JTAG download pins: JTDO, JTDI, and JTCK as ordinary IO ports is actually the same as configuring them as spi3, except that spi3 also needs to turn on the spi clock. Here, just change it to turn on the io port clock. The two most critical instructions are:
1. Turn on the multiplexed clock: RCC_APB2PeriphClockCmd (RCC_APB2Periph_AFIO, EANBLE);
2. Call the remapping function: GPIO_PinRemapConfig (GPIO_Remap_SWJ_JTAGDisable, ENABLE); // Turn off jtag and turn on swd
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