Am 13.12.2017 um 16:21 schrieb Valentin Vidic:
Avoid shifting by magic numbers and use defines instead:
SHIFT_DATAMODUL_MODULATION_TYPE
SHIFT_LNA_CURRENT_GAIN
Signed-off-by: Valentin Vidic <Valentin.Vidic@xxxxxxxxx>
---
drivers/staging/pi433/rf69.c | 4 ++--
drivers/staging/pi433/rf69_registers.h | 2 ++
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c
index b1e243e5bcac..8c4841c9d796 100644
--- a/drivers/staging/pi433/rf69.c
+++ b/drivers/staging/pi433/rf69.c
@@ -102,7 +102,7 @@ enum modulation rf69_get_modulation(struct spi_device *spi)
currentValue = rf69_read_reg(spi, REG_DATAMODUL);
- switch ((currentValue & MASK_DATAMODUL_MODULATION_TYPE) >> 3) { // TODO improvement: change 3 to define
+ switch ((currentValue & MASK_DATAMODUL_MODULATION_TYPE) >> SHIFT_DATAMODUL_MODULATION_TYPE) {
As mentioned by Dan, this change isn't needed any more, since we don't
need the shift right here, since the DATAMODUL_MODULATION_TYPE_OOK and
DATAMODUL_MODULATION_TYPE_FSK already contains the bits at the correct
position.
case DATAMODUL_MODULATION_TYPE_OOK: return OOK;
case DATAMODUL_MODULATION_TYPE_FSK: return FSK;
default: return UNDEF;
@@ -340,7 +340,7 @@ enum lnaGain rf69_get_lna_gain(struct spi_device *spi)
currentValue = rf69_read_reg(spi, REG_LNA);
- switch ((currentValue & MASK_LNA_CURRENT_GAIN) >> 3) { // improvement: change 3 to define
+ switch ((currentValue & MASK_LNA_CURRENT_GAIN) >> SHIFT_LNA_CURRENT_GAIN) {
Regarding my previous mail: I was wrong! This way is right!!
BUT: I would prefer to have a solution, like it was done for the
modulation type: Do not shift anything here, but introduce new defines
(LNA_GAIN_AUTO_xyz...), that are used for the casees, having the bits
set at the right position, so theycan be used without shifting.
Be aware: The old defines must remain untouched, since they are needed
for an other function.
Thx,
Marcus
case LNA_GAIN_AUTO: return automatic;
case LNA_GAIN_MAX: return max;
case LNA_GAIN_MAX_MINUS_6: return maxMinus6;
diff --git a/drivers/staging/pi433/rf69_registers.h b/drivers/staging/pi433/rf69_registers.h
index 981b57d7cc0b..da12642cf249 100644
--- a/drivers/staging/pi433/rf69_registers.h
+++ b/drivers/staging/pi433/rf69_registers.h
@@ -124,6 +124,7 @@
#define MASK_DATAMODUL_MODE 0x06
#define MASK_DATAMODUL_MODULATION_TYPE 0x18
#define MASK_DATAMODUL_MODULATION_SHAPE 0x03
+#define SHIFT_DATAMODUL_MODULATION_TYPE 3
#define DATAMODUL_MODE_PACKET 0x00 /* default */
#define DATAMODUL_MODE_CONTINUOUS 0x40
@@ -235,6 +236,7 @@
#define MASK_LNA_ZIN 0x80
#define MASK_LNA_CURRENT_GAIN 0x38
#define MASK_LNA_GAIN 0x07
+#define SHIFT_LNA_CURRENT_GAIN 3
#define LNA_GAIN_AUTO 0x00 /* default */
#define LNA_GAIN_MAX 0x01
--
Smarthome-Wolf UG (haftungsbeschränkt)
Helene-Lange-Weg 23
80637 München
Amtsgericht München, HRB 223529
Umastzsteuer-ID: DE304719911
Geschäftsführer: Marcus Wolf
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