1 | void SPI1_IRQHandler(void) {
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2 |
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3 | /* Check RXP flag value in ISR register */
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4 | if(LL_SPI_IsActiveFlag_RXP(SPI1) && LL_SPI_IsEnabledIT_RXP(SPI1))
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5 | {
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6 | uint8_t dataecho;
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7 | dataecho = LL_SPI_ReceiveData8(SPI1);
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8 | LL_SPI_TransmitData8(SPI1, dataecho);
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9 | }
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10 | }
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11 |
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12 | static void GPIOPins_SPI1_Config(void)
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13 | {
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14 | /* (1) Enables GPIO clock and configures the SPI1 pins ********************/
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15 | /* Enable the peripheral clock of GPIOE */
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16 | LL_AHB4_GRP1_EnableClock(LL_AHB4_GRP1_PERIPH_GPIOA);
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17 |
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18 | /* SPI1 SCK GPIO pin configuration*/
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19 | GPIO_InitStruct.Pin = LL_GPIO_PIN_4 | LL_GPIO_PIN_5 | LL_GPIO_PIN_6 | LL_GPIO_PIN_7;
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20 | GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
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21 | GPIO_InitStruct.Pull = LL_GPIO_PULL_DOWN;
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22 | GPIO_InitStruct.Speed = LL_GPIO_SPEED_HIGH;
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23 | GPIO_InitStruct.Alternate = LL_GPIO_AF_5;
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24 | LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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25 |
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26 | /* (2) Configure NVIC for SPI4 transfer complete/error interrupts **********/
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27 | /* Set priority for SPI4_IRQn */
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28 | NVIC_SetPriority(SPI1_IRQn, 0);
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29 | /* Enable SPI1_IRQn */
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30 | NVIC_EnableIRQ(SPI1_IRQn);
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31 | }
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32 |
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33 | static void SPI1_Config (void)
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34 | {
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35 | /* Configure SPI SLAVE *****************************************************/
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36 | /* Enable SPI4 Clock */
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37 | LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_SPI1);
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38 |
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39 | /* Configure the SPI4 parameters */
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40 | SPI_InitStruct.BaudRate = LL_SPI_BAUDRATEPRESCALER_DIV2;
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41 | SPI_InitStruct.TransferDirection = LL_SPI_FULL_DUPLEX;
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42 | SPI_InitStruct.ClockPhase = LL_SPI_PHASE_1EDGE;
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43 | SPI_InitStruct.ClockPolarity = LL_SPI_POLARITY_LOW;
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44 | SPI_InitStruct.BitOrder = LL_SPI_MSB_FIRST;
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45 | SPI_InitStruct.DataWidth = LL_SPI_DATAWIDTH_8BIT;
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46 | SPI_InitStruct.NSS = LL_SPI_NSS_HARD_INPUT;
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47 | SPI_InitStruct.CRCCalculation = LL_SPI_CRCCALCULATION_DISABLE;
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48 | SPI_InitStruct.Mode = LL_SPI_MODE_SLAVE;
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49 | LL_SPI_Init(SPI1, &SPI_InitStruct);
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50 |
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51 | // Set FIFO threshold
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52 | LL_SPI_SetFIFOThreshold(SPI1,LL_SPI_FIFO_TH_01DATA);
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53 |
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54 | /* Lock GPIO for master to avoid glitches on the clock output */
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55 | LL_SPI_DisableGPIOControl(SPI1);
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56 | LL_SPI_DisableMasterRxAutoSuspend(SPI1);
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57 |
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58 | /* Set number of data to transmit */
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59 | LL_SPI_SetTransferSize(SPI1, 1);
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60 |
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61 | /* Enable SPI1 */
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62 | LL_SPI_Enable(SPI1);
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63 |
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64 | /* Enable RXP Interrupt */
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65 | LL_SPI_EnableIT_RXP(SPI1);
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66 | }
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