1 | int main(void) {
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2 |
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3 | GPIO_InitTypeDef GPIO_InitStruct;
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4 | SPI_InitTypeDef SPI_InitStructure;
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5 |
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6 | RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
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7 |
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8 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
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9 |
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10 | /** SPI1 GPIO Configuration
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11 | PA5 ------> SPI1_SCK
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12 | PA7 ------> SPI1_MOSI
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13 |
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14 | PC0 ------> SPI1_CS
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15 | */
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16 |
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17 | /*Enable or disable the AHB peripheral clock */
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18 | RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
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19 |
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20 | /*Configure GPIO pin */
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21 | GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
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22 | GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
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23 | GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
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24 | GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
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25 | GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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26 | GPIO_Init(GPIOA, &GPIO_InitStruct);
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27 |
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28 | /*Configure GPIO pin alternate function */
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29 | GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_5 );
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30 |
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31 | /*Configure GPIO pin alternate function */
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32 | GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_5 );
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33 |
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34 | /* Configure SPI1 pins: CS PC0 ----------------------------*/
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35 | GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
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36 | GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
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37 | GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
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38 | GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
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39 | GPIO_Init(GPIOC, &GPIO_InitStruct);
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40 |
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41 | /*SPI Config*/
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42 |
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43 | SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
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44 | SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
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45 | SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
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46 | SPI_InitStructure.SPI_CRCPolynomial = 0;
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47 | SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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48 | SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
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49 | SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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50 | SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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51 | SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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52 | SPI_Init(SPI1, &SPI_InitStructure);
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53 |
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54 | SPI_Cmd(SPI1, ENABLE);
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55 |
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56 | //int count = 0;
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57 |
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58 | while (1) {
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59 |
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60 | GPIO_WriteBit(GPIOC, GPIO_Pin_0, 0); //CS auf LOW
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61 | while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE ) == RESET)
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62 | ;
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63 | SPI_SendData8(SPI1, 0x01);
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64 | while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE ) == RESET)
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65 | ;
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66 | GPIO_WriteBit(GPIOC, GPIO_Pin_0, 1); //CS auf HIGH
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67 | //for(count = 0; count <= 999; count++){}
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68 |
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69 | }
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70 |
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71 | /* Program will never run to this line */
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72 | return 0;
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73 | }
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SPI.png
(71 KB)
