Merge pull request #250 from boramonideep/wire_fix

added wait for ACK after a I2C transaction
Infineon · Aug 30, 2023 · 901967a · 901967a
2 parents 70b950a + 95b1f0e
commit 901967a
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/libraries/Wire/src/Wire.cpp b/libraries/Wire/src/Wire.cpp
@@ -245,6 +245,14 @@ uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint32_t iaddres
         XMC_I2C_CH_MasterStart(XMC_I2C_config->channel, (txAddress << 1), XMC_I2C_CH_CMD_READ);
     }
 
+    timeout = WIRE_COMMUNICATION_TIMEOUT;
+    // wait for ACK or timeout incase no ACK is received, a time-based wait-state is added since XMC devices run at variable frequencies
+    while(((XMC_I2C_CH_GetStatusFlag(XMC_I2C_config->channel) & XMC_I2C_CH_STATUS_FLAG_ACK_RECEIVED) == 0U) || timeout == 0)
+    {
+        delay(1);
+        timeout--;
+    }
+
     for (uint8_t count = 0; count < (quantity - 1); count ++)
     {
         XMC_I2C_CH_MasterReceiveAck(XMC_I2C_config->channel);