ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Merge pull request #3502 from NXPmicro/I2C_Zerobyte_Write 

MCUXpresso I2C: Handle 0 byte write
pull/3514/head
Martin Kojtal 2016-12-30 12:36:36 +01:00 committed by GitHub
parent 306cc1ab6d 1280dfcca5
commit 518b07263c
1 changed files with 20 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/api/i2c_api.c
View File

@ -81,8 +81,8 @@ int i2c_start(i2c_t *obj)
int i2c_stop(i2c_t *obj) int i2c_stop(i2c_t *obj)
{ {
if (I2C_MasterStop(i2c_addrs[obj->instance]) != kStatus_Success) {
obj->next_repeated_start = 0; obj->next_repeated_start = 0;
if (I2C_MasterStop(i2c_addrs[obj->instance]) != kStatus_Success) {
return 1; return 1;
} }
@ -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_Type *base = i2c_addrs[obj->instance];
i2c_master_transfer_t master_xfer; 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)); memset(&master_xfer, 0, sizeof(master_xfer));
master_xfer.slaveAddress = address >> 1; master_xfer.slaveAddress = address >> 1;
master_xfer.direction = kI2C_Write; master_xfer.direction = kI2C_Write;