STM32_SPI driver analysis (SD card)-EEWORLD

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SD card has two optional communication protocols: SD mode and SPI mode. In order to simplify the circuit and program, SPI mode is selected. ZC09's SD is connected to STM32 through SPI1. Because STM32 has an integrated SPI controller, SPI timing can be achieved with simple configuration.

1. Configure SPI1 controller

1. First, you need to turn on the clock of SPI1 and the clock of the GPIO port where the SPI1 signal line is located. Since the SPI1 signal line is on GPIOA, use the following code to turn on the required clock. It should be noted that it is best to turn on SPI1 and GPIOA together, because I have tried to turn on the SPI1 clock first, and then turn on the GPIOA clock after a few lines of code, which caused the SD card operation to fail.

2. Configure pins 5, 6, and 7 of GPIOA as multiplexed push-pull outputs, 50MHz.

3. The enable pin of the SD card is directly connected to pin 15 of GPIOB of STM32, so I also want to configure this pin.

4. The next step is to configure the SPI1 controller. According to the SD card data sheet, configure the registers of the SPI1 controller.

5. After configuration, you can start the SPI1 controller.

2. Write other SPI drivers

1. Since the operation of SD card after power-on is in low speed mode, the operation of SD card after power-on must be less than 400kHz, so we need to write an interface that can set the SPI speed.

2. SPI read and write driver

Keywords：STM32 Reference address：STM32_SPI driver analysis (SD card)

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