Hi,
ich möchte einen STM8L mit einem CO2 Sensor über I2C kommunizieren
lassen. Als Muster wird ein Beispielcode von ST genommen. Die
Beschreibung lautet:
•Phase 1: In master board I2C peripheral is configured in Master
Transmitter with Interrupt, where in Slave board I2C peripheral is
configured in Slave Receiver with Interrupt. The master will send Data
to Slave according to the defined buffer size.
•Phase 2: In master board I2C peripheral is configured in Master
Receiver with Polling, where in Slave board I2C peripheral is configured
in Slave Transmitter with Interrupt. Once the master has initiated the
communication (Start condition), the slave will send back the previously
received data to the master
Ich beschäftige mich zur Zeit mit der ersten Phase. Der Codeabschnitt
von Main() und ISR stehen unten.
Problem: Mit Debuggen erkennt man dass nur das erste Case in der ISR
ausgeführt wird, also:
1 | I2C_Send7bitAddress(I2C1, SLAVE_ADDRESS, I2C_Direction_Transmitter);
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Die anderen werden nie erreicht. Der ganze Code hängt an der Stelle:
Hat jemand ähnliche Probleme?
Das ist interessant dass der Master nur den Start generiert. Müssen
Daten anhand
von Hand gesendet werden?
Code:
1 | /* TXBuffer initialization */
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2 | TxBuffer[0] = 0x22;
|
3 | TxBuffer[1] = 0x00;
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4 | TxBuffer[2] = 0x08;
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5 | TxBuffer[3] = 0x2A;
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6 |
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7 | Delay((uint32_t)0xFFFF);
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8 |
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9 | /* Send START condition */
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10 | I2C_GenerateSTART(I2C1, ENABLE);
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11 |
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12 | while (NumOfBytes);
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13 | while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
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14 |
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15 | /* Add a delay to be sure that communication is finished */
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16 | Delay(0xFFFF);
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17 |
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18 | INTERRUPT_HANDLER(I2C1_SPI2_IRQHandler, 29)
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19 | {
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20 | switch (I2C_GetLastEvent(I2C1))
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21 | {
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22 | /* EV5 */
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23 | case I2C_EVENT_MASTER_MODE_SELECT :
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24 | /* Send slave Address for write */
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25 | I2C_Send7bitAddress(I2C1, SLAVE_ADDRESS, I2C_Direction_Transmitter);
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26 | break;
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27 |
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28 | /* EV6 */
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29 | case I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED:
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30 | if (NumOfBytes != 0)
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31 | {
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32 | /* Send the first Data */
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33 | I2C_SendData(I2C1, TxBuffer[Tx_Idx++]);
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34 |
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35 | /* Decrement number of bytes */
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36 | NumOfBytes--;
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37 | }
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38 | if (NumOfBytes == 0)
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39 | {
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40 | I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
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41 | }
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42 | break;
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43 |
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44 | /* EV8 */
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45 | case I2C_EVENT_MASTER_BYTE_TRANSMITTING:
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46 | /* Transmit Data */
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47 | I2C_SendData(I2C1, TxBuffer[Tx_Idx++]);
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48 |
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49 | /* Decrement number of bytes */
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50 | NumOfBytes--;
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51 |
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52 | if (NumOfBytes == 0)
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53 | {
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54 | I2C_ITConfig(I2C1, I2C_IT_BUF, DISABLE);
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55 | }
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56 | break;
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57 |
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58 | /* EV8_2 */
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59 | case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
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60 | /* Send STOP condition */
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61 | I2C_GenerateSTOP(I2C1, ENABLE);
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62 |
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63 | I2C_ITConfig(I2C1, I2C_IT_EVT, DISABLE);
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64 | break;
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65 |
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66 | default:
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67 | break;
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68 | }
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69 | }
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MfG
Owen
