ch552 spi
时间: 2023-08-18 19:03:50 浏览: 42
CH552 is a microcontroller chip developed by WCH, which supports SPI communication protocol. Here are the general steps to perform SPI communication with CH552:
1. Configure the SPI pins: Set the pin mode and direction of the SPI pins (MISO, MOSI, SCK) as output or input.
2. Initialize the SPI module: Set up the SPI module registers, such as data format, clock frequency, and slave select pins.
3. Send data: Write the data to the SPI data register and wait for the data transmission to complete. For example, if you want to send a byte of data, you can write it to the SPI data register (SPDAT) and wait for the SPIF flag to be set, indicating that the transmission is complete.
4. Receive data: After sending data, you can receive data from the SPI module. For example, you can read the received data from the SPI data register (SPDAT).
5. Disable the SPI module: After the SPI communication is complete, disable the SPI module by clearing the SPIEN bit in the SPI control register (SPCTL).
Here is an example code for CH552 SPI communication:
```c
#include <ch552.h>
void spi_init(void)
{
// Configure SPI pins
P1_MOD_OC &= ~(BIT3 | BIT4 | BIT5);
P1_DIR_PU |= BIT3;
P1_DIR_PD |= BIT4;
P1_DIR_PU |= BIT5;
// Initialize SPI module
SPCTL = 0x40; // Set master mode and enable SPI module
SPSTAT = 0xC0; // Clear SPIF flag and set mode fault flag
}
void spi_send_byte(uint8_t data)
{
SPDAT = data; // Write data to SPI data register
while (!(SPSTAT & 0x80)); // Wait for SPIF flag to be set
}
uint8_t spi_receive_byte(void)
{
while (!(SPSTAT & 0x80)); // Wait for SPIF flag to be set
return SPDAT; // Read data from SPI data register
}
void spi_disable(void)
{
SPCTL &= ~0x40; // Disable SPI module
}
int main()
{
spi_init();
// Send and receive data
spi_send_byte(0x55);
uint8_t received_data = spi_receive_byte();
spi_disable();
return 0;
}
```
Note that the above code is just an example, and you may need to modify it according to your specific requirements. Also make sure to refer to the CH552 datasheet for more detailed information on the SPI module registers and pins.