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Code style fixes
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adamdunkels
parent
8e5d255b5b
commit
f58b387bd3
@ -26,7 +26,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: sht11.c,v 1.1 2007/10/22 12:19:58 nvt-se Exp $
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* @(#)$Id: sht11.c,v 1.2 2008/07/08 08:23:47 adamdunkels Exp $
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*/
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/*
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@ -57,7 +57,7 @@
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/* This can probably be reduced to 250ns according to data sheet. */
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#define delay_400ns() _NOP()
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/*---------------------------------------------------------------------------*/
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static void
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sstart(void)
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{
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@ -75,20 +75,21 @@ sstart(void)
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delay_400ns();
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SCL_0();
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}
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/*---------------------------------------------------------------------------*/
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static void
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sreset(void)
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{
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int i;
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SDA_1(); SCL_0();
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for (i = 0; i < 9 ; i++) {
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SDA_1();
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SCL_0();
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for(i = 0; i < 9 ; i++) {
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SCL_1();
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delay_400ns();
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SCL_0();
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}
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sstart(); /* Start transmission, why??? */
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Return true if we received an ACK.
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*/
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@ -99,11 +100,12 @@ swrite(unsigned _c)
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int i;
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int ret;
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for (i = 0; i < 8; i++, c <<= 1) {
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if (c & 0x80)
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for(i = 0; i < 8; i++, c <<= 1) {
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if(c & 0x80) {
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SDA_1();
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else
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} else {
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SDA_0();
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}
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SCL_1();
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delay_400ns();
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SCL_0();
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@ -118,7 +120,7 @@ swrite(unsigned _c)
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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static unsigned
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sread(int send_ack)
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{
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@ -126,17 +128,19 @@ sread(int send_ack)
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unsigned char c = 0x00;
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SDA_1();
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for (i = 0; i < 8; i++) {
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for(i = 0; i < 8; i++) {
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c <<= 1;
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SCL_1();
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delay_400ns();
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if (SDA_IS_1)
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if(SDA_IS_1) {
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c |= 0x1;
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}
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SCL_0();
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}
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if (send_ack)
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if(send_ack) {
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SDA_0();
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}
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SCL_1();
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delay_400ns();
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SCL_0();
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@ -145,7 +149,7 @@ sread(int send_ack)
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return c;
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}
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/*---------------------------------------------------------------------------*/
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#define CRC_CHECK
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#ifdef CRC_CHECK
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static unsigned char
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@ -162,23 +166,24 @@ rev8bits(unsigned char v)
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r <<= s; /* Shift when v's highest bits are zero */
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return r;
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}
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/*---------------------------------------------------------------------------*/
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/* BEWARE: Bit reversed CRC8 using polynomial ^8 + ^5 + ^4 + 1 */
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static unsigned
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crc8_add(unsigned acc, unsigned byte)
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{
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int i;
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acc ^= byte;
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for (i = 0; i < 8; i++)
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if (acc & 0x80)
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for(i = 0; i < 8; i++) {
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if(acc & 0x80) {
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acc = (acc << 1) ^ 0x31;
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else
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} else {
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acc <<= 1;
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}
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}
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return acc & 0xff;
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}
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#endif /* CRC_CHECK */
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/*---------------------------------------------------------------------------*/
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/*
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* Power up the device. The device can be used after an additional
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* 11ms waiting time.
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@ -195,7 +200,7 @@ sht11_init(void)
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SHT11_PxOUT &= ~(BV(SHT11_ARCH_SDA) | BV(SHT11_ARCH_SCL));
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SHT11_PxDIR |= BV(SHT11_ARCH_PWR) | BV(SHT11_ARCH_SCL);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Power of device.
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*/
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@ -206,24 +211,26 @@ sht11_off(void)
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SHT11_PxOUT &= ~(BV(SHT11_ARCH_SDA) | BV(SHT11_ARCH_SCL));
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SHT11_PxDIR |= BV(SHT11_ARCH_PWR) | BV(SHT11_ARCH_SCL);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Only commands MEASURE_HUMI or MEASURE_TEMP!
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*/
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static unsigned
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static unsigned int
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scmd(unsigned cmd)
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{
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unsigned long n;
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if (cmd != MEASURE_HUMI && cmd != MEASURE_TEMP)
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if(cmd != MEASURE_HUMI && cmd != MEASURE_TEMP) {
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return -1;
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}
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sstart(); /* Start transmission */
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if (!swrite(cmd))
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if(!swrite(cmd)) {
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goto fail;
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}
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for (n = 0; n < 250000; n++)
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if (!SDA_IS_1) {
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for(n = 0; n < 250000; n++) {
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if(!SDA_IS_1) {
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unsigned t0, t1, rcrc;
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t0 = sread(1);
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t1 = sread(1);
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@ -234,36 +241,38 @@ scmd(unsigned cmd)
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crc = crc8_add(0x0, cmd);
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crc = crc8_add(crc, t0);
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crc = crc8_add(crc, t1);
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if (crc != rev8bits(rcrc))
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if(crc != rev8bits(rcrc)) {
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goto fail;
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}
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}
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#endif
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return (t0 << 8) | t1;
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}
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}
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fail:
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sreset();
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Call may take up to 210ms.
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*/
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unsigned
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unsigned int
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sht11_temp(void)
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{
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return scmd(MEASURE_TEMP);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Call may take up to 210ms.
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*/
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unsigned
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unsigned int
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sht11_humidity(void)
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{
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return scmd(MEASURE_HUMI);
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}
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/*---------------------------------------------------------------------------*/
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#if 0 /* But ok! */
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unsigned
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sht11_sreg(void)
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@ -271,8 +280,9 @@ sht11_sreg(void)
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unsigned sreg, rcrc;
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sstart(); /* Start transmission */
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if (!swrite(STATUS_REG_R))
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if(!swrite(STATUS_REG_R)) {
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goto fail;
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}
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sreg = sread(1);
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rcrc = sread(0);
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@ -294,16 +304,18 @@ sht11_sreg(void)
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return -1;
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}
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#endif
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/*---------------------------------------------------------------------------*/
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#if 0
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int
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sht11_set_sreg(unsigned sreg)
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{
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sstart(); /* Start transmission */
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if (!swrite(STATUS_REG_W))
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if(!swrite(STATUS_REG_W)) {
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goto fail;
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if (!swrite(sreg))
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}
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if(!swrite(sreg)) {
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goto fail;
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}
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return 0;
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@ -312,14 +324,15 @@ sht11_set_sreg(unsigned sreg)
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return -1;
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}
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#endif
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/*---------------------------------------------------------------------------*/
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#if 0
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int
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sht11_reset(void)
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{
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sstart(); /* Start transmission */
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if (!swrite(RESET))
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if(!swrite(RESET)) {
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goto fail;
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}
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return 0;
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@ -328,3 +341,4 @@ sht11_reset(void)
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return -1;
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}
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#endif
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/*---------------------------------------------------------------------------*/
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@ -26,7 +26,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: sht11.h,v 1.1 2007/10/22 12:19:58 nvt-se Exp $
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* @(#)$Id: sht11.h,v 1.2 2008/07/08 08:23:47 adamdunkels Exp $
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*/
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#ifndef SHT11_H
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@ -35,9 +35,9 @@
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void sht11_init(void);
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void sht11_off(void);
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unsigned sht11_temp(void);
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unsigned sht11_humidity(void);
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unsigned sht11_sreg(void);
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unsigned int sht11_temp(void);
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unsigned int sht11_humidity(void);
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unsigned int sht11_sreg(void);
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int sht11_set_sreg(unsigned);
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/*
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