1 | void SPI2_Init(void)
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2 | {
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3 | GPIO_InitTypeDef GPIO_InitStructure;
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4 | SPI_InitTypeDef SPI_InitStructure;
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5 |
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6 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
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7 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
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8 | RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
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9 |
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10 | SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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11 | SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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12 | SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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13 | SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
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14 | SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
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15 | SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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16 | SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
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17 | SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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18 | SPI_InitStructure.SPI_CRCPolynomial = 7;
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19 | SPI_Init(SPI2, &SPI_InitStructure);
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20 |
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21 | // Connect SPI pins to AF
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22 | GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
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23 | GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
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24 | GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
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25 |
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26 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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27 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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28 | GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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29 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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30 |
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31 | // SPI SCK pin configuration
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32 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
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33 | GPIO_Init(GPIOB, &GPIO_InitStructure);
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34 |
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35 | // SPI MISO pin configuration
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36 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
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37 | GPIO_Init(GPIOB, &GPIO_InitStructure);
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38 |
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39 | // SPI MOSI pin configuration
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40 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
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41 | GPIO_Init(GPIOB, &GPIO_InitStructure);
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42 |
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43 | // CS as output
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44 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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45 | GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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46 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
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47 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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48 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
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49 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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50 |
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51 | SPI_Cmd(SPI2, ENABLE);
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52 | }
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53 |
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54 | void SPI2_TxByte(uint8_t byte)
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55 | {
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56 | while(SPI_I2S_GetFlagStatus(SPI2,SPI_I2S_FLAG_TXE) == RESET);
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57 | SPI_I2S_SendData(SPI2, byte);
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58 | }
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