STM32 HAL library emulates SPI

Because the SPI port is not enough, the analog SPI is used, and the program is relatively simple. The SPI mode 0 is used. During the process, the port cannot communicate. After using the logic analyzer, it is found that the clock line has a wrong clock. Now it is no problem.

 

#define SSD1306_SOFT_SPI_MOSI_PORT 		OLED_DATA_GPIO_Port
#define SSD1306_SOFT_SPI_MOSI_PIN 		OLED_DATA_Pin

#define SSD1306_SOFT_SPI_MISO_PORT 		OLED_DATA_GPIO_Port
#define SSD1306_SOFT_SPI_MISO_PIN 		OLED_DATA_Pin

#define SSD1306_SOFT_SPI_CLK_PORT 		OLED_CLK_GPIO_Port
#define SSD1306_SOFT_SPI_CLK_PIN 			OLED_CLK_Pin

#define SSD1306_CLK_RESET 						HAL_GPIO_WritePin(SSD1306_SOFT_SPI_CLK_PORT, SSD1306_SOFT_SPI_CLK_PIN, GPIO_PIN_RESET)
#define SSD1306_CLK_SET 							HAL_GPIO_WritePin(SSD1306_SOFT_SPI_CLK_PORT, SSD1306_SOFT_SPI_CLK_PIN, GPIO_PIN_SET)

#define SSD1306_MOSI_RESET 						HAL_GPIO_WritePin(SSD1306_SOFT_SPI_MOSI_PORT, SSD1306_SOFT_SPI_MOSI_PIN, GPIO_PIN_RESET)
#define SSD1306_MOSI_SET 							HAL_GPIO_WritePin(SSD1306_SOFT_SPI_MOSI_PORT, SSD1306_SOFT_SPI_MOSI_PIN, GPIO_PIN_SET)

#define SSD1306_MOSI_IN 							HAL_GPIO_ReadPin(SSD1306_SOFT_SPI_MISO_PORT, SSD1306_SOFT_SPI_MISO_PIN)


uint8_t software_spi_wr(uint8_t data){
	//模式0
	uint8_t i, temp = 0;
	//CLK = 0
	SSD1306_CLK_RESET;
	for(i=0;i<8;i++){
		SSD1306_CLK_RESET;
		if(data&0x80) SSD1306_MOSI_SET;
		else SSD1306_MOSI_RESET;
		data<<=1;
		SSD1306_CLK_SET;
		
		//如果不用读的功能，添加这句话，进行几个时钟周期的延时
		SSD1306_CLK_SET;
		
		//如果要读，取下下面注释，并注释上面的延时
		//temp <<=1;
		//temp += SSD1306_MOSI_IN;
	}
	SSD1306_CLK_RESET;
	return temp;
}

from:https://blog.csdn.net/shaynerain