/*---------------------------------------------------------------------------*/
#if 1 /* But ok! */
unsigned
sht11_sreg(void)
{
unsigned sreg, rcrc;
sstart(); /* Start transmission */
if(!swrite(STATUS_REG_R)) {
goto fail;
}
sreg = sread(1);
rcrc = sread(0);
#ifdef CRC_CHECK
{
unsigned crc;
crc = crc8_add(0x0, STATUS_REG_R);
crc = crc8_add(crc, sreg);
if (crc != rev8bits(rcrc))
goto fail;
}
#endif
return sreg;
fail:
sreset();
return -1;
}
/*
* Only commands MEASURE_HUMI or MEASURE_TEMP!
*/
static unsigned int
scmd(unsigned cmd)
{
unsigned long n;
if(cmd != MEASURE_HUMI && cmd != MEASURE_TEMP) {
return -1;
}
MCUCR |= (1<<JTD);
MCUCR |= (1<<JTD);
sreset();
/* Start transmission */
if(!swrite(cmd)) {
//printf("-2");
goto fail;
}
for(n = 0; n < 250000; n++) {
if(!SDA_IS_1) {
unsigned t0, t1, rcrc;
t0 = sread(1);
t1 = sread(1);
rcrc = sread(0);
//printf("t0:%d",t0);
//printf("t1:%d",t1);
#ifdef CRC_CHECK
{
unsigned crc;
crc = crc8_add(0x0, cmd);
crc = crc8_add(crc, t0);
crc = crc8_add(crc, t1);
if(crc != rev8bits(rcrc)) {
// printf("-3");
goto fail;
}
}
#endif
MCUCR &= (0<<JTD);
MCUCR &= (0<<JTD);
return (t0 << 8) | t1;
}
}
fail:
sreset();
//printf("-1");
MCUCR &= (0<<JTD);
MCUCR &= (0<<JTD);
return -1;
}
/*
* Only commands MEASURE_HUMI or MEASURE_TEMP!
*/
static unsigned int
scmd(unsigned cmd)
{
unsigned int n;
if(cmd != MEASURE_HUMI && cmd != MEASURE_TEMP) {
PRINTF("Illegal command: %d\n", cmd);
return -1;
}
sstart(); /* Start transmission */
if(!swrite(cmd)) {
PRINTF("SHT11: scmd - swrite failed\n");
goto fail;
}
for(n = 0; n < 20000; n++) {
if(!SDA_IS_1) {
unsigned t0, t1, rcrc;
t0 = sread(1);
t1 = sread(1);
rcrc = sread(0);
PRINTF("SHT11: scmd - read %d, %d\n", t0, t1);
#ifdef CRC_CHECK
{
unsigned crc;
crc = crc8_add(0x0, cmd);
crc = crc8_add(crc, t0);
crc = crc8_add(crc, t1);
if(crc != rev8bits(rcrc)) {
PRINTF("SHT11: scmd - crc check failed %d vs %d\n",
crc, rev8bits(rcrc));
goto fail;
}
}
#endif
return (t0 << 8) | t1;
}
/* short wait before next loop */
clock_wait(1);
}
fail:
sreset();
return -1;
}
static void End_Callback(void)
{
uint8_t i;
// If there was a communication error, return and don't process packet
if (CommStatus & COMM_ERROR)
return;
if (SMB_Packet.RxCounter != 0x00)
{
#ifdef SMB_NACK_WHILE_BUSY
TI_MSPBoot_CI_PHYDL_disable(); // NACK until we have processed the command
#endif
#ifdef SMB_PEC_SUPPORTED
// Packet with PEC should have at least more than 1 byte (CMD + PEC)
if ((SMB_Packet.RxCounter > 1) && (SMB_Packet.RxPacket[0] & PEC_CMD))
{
SMB_Packet.Pec = 0x00;
crc8_add(&SMB_Packet.Pec, I2C_SLAVE_ADDR_W);
for (i=0; i < (SMB_Packet.RxCounter-1); i++)
crc8_add(&SMB_Packet.Pec, SMB_Packet.RxPacket[i]);
if (SMB_Packet.Pec != SMB_Packet.RxPacket[SMB_Packet.RxCounter -1])
{
SMB_Packet.TxByte = RESPONSE_PEC_ERROR;
#ifdef SMB_NACK_WHILE_BUSY
TI_MSPBoot_CI_PHYDL_reenable();
#endif
return;
}
}
#endif
CommStatus |= COMM_PACKET_RX; // Packet was received
}
}
