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Improve rf23x cca procesing

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Fix delay_loop timing bug by using long long calculation.
128rfa1 and rf230 both working with contikimac RDC
This commit is contained in:
David Kopf 2011-11-14 11:49:58 -05:00
parent 062b85123e
commit 31ba84eb75
3 changed files with 30 additions and 19 deletions
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cpu/avr/radio/rf230bb/halbb.c
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@ -952,7 +952,7 @@ HAL_RF230_ISR()
/* Save RSSI for this packet if not in extended mode, scaling to 1dB resolution */
#if !RF230_CONF_AUTOACK
#if 0 // 3-clock shift and add is faster on machines with no hardware multiply
// While the compiler should use similar code for multiply by 3 there may be a bug with -Os in avr-gcc that calls the general subroutine
// With -Os avr-gcc saves a byte by using the general routine for multiply by 3
rf230_last_rssi = hal_subregister_read(SR_RSSI);
rf230_last_rssi = (rf230_last_rssi <<1) + rf230_last_rssi;
#else // Faster with 1-clock multiply. Raven and Jackdaw have 2-clock multiply so same speed while saving 2 bytes of program memory