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MCUXpresso I2C: Handle 0 byte write #3502

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Merged
merged 1 commit into from
Dec 30, 2016
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MCUXpresso I2C: Handle 0 byte write #3502

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21 changes: 20 additions & 1 deletion targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/api/i2c_api.c
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Original file line number Diff line number Diff line change
Expand Up @@ -81,8 +81,8 @@ int i2c_start(i2c_t *obj)

int i2c_stop(i2c_t *obj)
{
obj->next_repeated_start = 0;
if (I2C_MasterStop(i2c_addrs[obj->instance]) != kStatus_Success) {
obj->next_repeated_start = 0;
return 1;
}

Expand Down Expand Up @@ -131,6 +131,25 @@ int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
I2C_Type *base = i2c_addrs[obj->instance];
i2c_master_transfer_t master_xfer;

if (length == 0) {
if (I2C_MasterStart(base, address >> 1, kI2C_Write) != kStatus_Success) {
return I2C_ERROR_NO_SLAVE;
}

while (!(base->S & kI2C_IntPendingFlag)) {
}

base->S = kI2C_IntPendingFlag;

if (base->S & kI2C_ReceiveNakFlag) {
i2c_stop(obj);
return I2C_ERROR_NO_SLAVE;
} else {
i2c_stop(obj);
return length;
}
}

memset(&master_xfer, 0, sizeof(master_xfer));
master_xfer.slaveAddress = address >> 1;
master_xfer.direction = kI2C_Write;
Expand Down