84 lines
4.1 KiB
C
84 lines
4.1 KiB
C
#include "spi.h"
|
|
//////////////////////////////////////////////////////////////////////////////////
|
|
//This program is for educational purposes only, without the author's permission, may not be used for any other purpose
|
|
//ALIENTEK STM32F4 Explorer Board
|
|
//SPI Driver code
|
|
//Hot Atomic @ALIENTEK
|
|
//Forum: www.openedv.com
|
|
//Date modified: 2014/5/6
|
|
//Version: V1.0
|
|
//All rights reserved pirated reserved.
|
|
//Copyright(C) Guangzhou wing electronic technology limited company 2009-2019
|
|
//All rights reserved
|
|
//////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
|
//Following is the SPI module initialization code, and configured to master mode
|
|
//SPI port initialization
|
|
//Needle is SPI1 initialization
|
|
void SPI2_Init(void)
|
|
{
|
|
GPIO_InitTypeDef GPIO_InitStructure;
|
|
SPI_InitTypeDef SPI_InitStructure;
|
|
|
|
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); // Enable GPIOB clock
|
|
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2 , ENABLE); // Enable SPI2 clock
|
|
|
|
//GPIO B13, B14, B15 initialization settings
|
|
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13
|
|
| GPIO_Pin_14
|
|
| GPIO_Pin_15
|
|
; // PB13~15 reuse function output
|
|
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; // Multiplexing function
|
|
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // Push-pull output
|
|
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // 100MHz
|
|
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // Pull-up
|
|
GPIO_Init(GPIOB, &GPIO_InitStructure); // Initialize
|
|
|
|
GPIO_PinAFConfig(GPIOB,GPIO_PinSource13, GPIO_AF_SPI2); // PB13 multiplexing SPI1
|
|
GPIO_PinAFConfig(GPIOB,GPIO_PinSource14, GPIO_AF_SPI2); // PB14 multiplexing SPI1
|
|
GPIO_PinAFConfig(GPIOB,GPIO_PinSource15, GPIO_AF_SPI2); // PB15 multiplexing SPI1
|
|
|
|
//Here only for the SPI port initialization
|
|
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; // Set SPI unidirectional or bi-directional data modes: SPI is set to two-lane bi-directional full-duplex
|
|
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; // Set SPI mode: set master SPI
|
|
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; // Set SPI data size: send receive 8-bit SPI frame structure
|
|
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; // Serial synchronous clock idle high
|
|
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; // Serial synchronous clocks second jump (increase or decrease) the data is sampled
|
|
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; // NSS is set by hardware (NSS pins) or software (using SSI) management: internal NSS SSI signal level control
|
|
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; // Define baud rate predissociation spectrum of values: baud rate predissociation spectrum value of 256
|
|
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; // Specifies the data transmission starting from MSB or LSB bit: data transmission starting from the MSB
|
|
SPI_InitStructure.SPI_CRCPolynomial = 7; // CRC calculate polynomials
|
|
SPI_Init(SPI2, &SPI_InitStructure); // According to the parameters specified in SPI_InitStruct to initialize peripherals SPIx register
|
|
|
|
SPI_Cmd(SPI2, ENABLE); // Make SPI peripherals
|
|
|
|
SPI2_ReadWriteByte(0xff); // To start the transfer
|
|
}
|
|
|
|
//SPI1 speed setting function
|
|
//SpeedSet:0~7
|
|
//SPI speed =fAPB2/2^ (SpeedSet+1)
|
|
//FAPB2 84Mhz
|
|
void SPI2_SetSpeed(u8 SPI_BaudRatePrescaler)
|
|
{
|
|
assert_param(IS_SPI_BAUDRATE_PRESCALER(SPI_BaudRatePrescaler));
|
|
SPI2->CR1 &= 0XFFC7;
|
|
SPI2->CR1 |= SPI_BaudRatePrescaler; //Set SPI1 speed
|
|
SPI_Cmd(SPI2, ENABLE);
|
|
}
|
|
//SPI1 read and write bytes
|
|
//TxData: the bytes to write
|
|
//Return value: reads a byte
|
|
u8 SPI2_ReadWriteByte(u8 TxData)
|
|
{
|
|
|
|
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET){}//Waiting to be sent
|
|
|
|
SPI_I2S_SendData(SPI2, TxData); //Send a byte data through peripheral SPIx
|
|
|
|
while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET){} //Wait to receive a one byte
|
|
|
|
return SPI_I2S_ReceiveData(SPI2); //Returned by SPIx recently received data
|
|
}
|