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added wait for ACK after a I2C transaction #250

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merged 3 commits into from
Aug 30, 2023
Merged

added wait for ACK after a I2C transaction #250

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31e2ea8
added wait for ACK after a I2C transaction
boramonideep Aug 8, 2023
6eb1a03
added timeout to make loop unblocking in Wire fix
boramonideep Aug 18, 2023
95b1f0e
added delay to timeout logic to make execution fair to XMC devices wi…
boramonideep Aug 30, 2023
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8 changes: 8 additions & 0 deletions libraries/Wire/src/Wire.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
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