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uc: implement 16x16 -> 32 unsigned MAC macro

This commit is contained in:
Bart Van Der Meerssche 2009-11-16 00:56:00 +00:00
parent b69e04c4ac
commit f840b0925a
2 changed files with 37 additions and 3 deletions
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7
uc/main.c
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@ -1,5 +1,5 @@
//
// main.1mhz.c : AVR uC code for flukso sensor board
// main.c : AVR uC code for flukso sensor board
// Copyright (c) 2008-2009 jokamajo.org
//
// This program is free software; you can redistribute it and/or
@ -70,7 +70,8 @@ ISR(PCINT2_vect) {
ISR(TIMER2_OVF_vect) {
// read ADC result
// add to nano(Wh) counter
aux[0].nano += (uint32_t)METERCONST * ADC;
MacU16X16to32(aux[0].nano, METERCONST, ADC);
if (aux[0].nano > 1000000000) {
measurements[0].value++;
aux[0].pulse = true;
@ -269,6 +270,8 @@ int main(void)
for (i=0; i<4; i++) _delay_ms(5000);
serialFlush();
printString("\n");
WDT_on();
for (;;) loop();

33
uc/main.h
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@ -1,5 +1,5 @@
//
// main.1mhz.h : AVR uC header file for flukso sensor board
// main.h : AVR uC header file for flukso sensor board
// Copyright (c) 2008-2009 jokamajo.org
//
// This program is free software; you can redistribute it and/or
@ -49,6 +49,37 @@
#define END1 0xdddddddd
#define END0 0xcccccccc
// This macro performs a 16x16 -> 32 unsigned MAC in 37 cycles with operands and results in memory
// based on http://www2.ife.ee.ethz.ch/~roggend/publications/wear/DSPMic_v1.1.pdf par 3.4 and table 31.
#define MacU16X16to32(uint_32Acc, uint_16In1, uint_16In2) \
asm volatile ( \
"clr r2 \n\t" \
"mul %B2, %B1 \n\t" \
"movw r4, r0 \n\t" \
"mul %A2, %A1 \n\t" \
"add %A0, r0 \n\t" \
"adc %B0, r1 \n\t" \
"adc %C0, r4 \n\t" \
"adc %D0, r5 \n\t" \
"mul %B2, %A1 \n\t" \
"add %B0, r0 \n\t" \
"adc %C0, r1 \n\t" \
"adc %D0, r2 \n\t" \
"mul %A2, %B1 \n\t" \
"add %B0, r0 \n\t" \
"adc %C0, r1 \n\t" \
"adc %D0, r2 \n\t" \
"clr r1 \n\t" \
: \
"+r" (uint_32Acc) \
: \
"a" (uint_16In1), \
"a" (uint_16In2) \
: \
"r2", "r4", "r5" \
)
// datastructures
struct state {
boolean pulse;