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better sond measurment, tolerant to static voltage on piezo

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This commit is contained in:
bigalex 2012-10-05 23:11:24 +02:00
parent f1690c6cd1
commit 5d3c3bcb51
1 changed files with 8 additions and 3 deletions
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7
firmware/main.c
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@ -44,6 +44,7 @@ void modeswitch_poll(void){
void do_mode0(void){
static timer_t mytimer;
static uint16_t maxval;
static uint16_t lastmaxval;
uint16_t curval;
if (ModeChanged){
@ -54,10 +55,14 @@ void do_mode0(void){
maxval=0;
};
if(timer_expired(&mytimer)){
if(maxval>lastmaxval){
USART0_put_uint16(maxval);
USART0_crlf();
};
timer_set(&mytimer, 1);
if (maxval>0) {led_on(LED_R|LED_L);} else {led_off(LED_R|LED_L);};
if (maxval>lastmaxval) {led_on(LED_R|LED_L);} else {led_off(LED_R|LED_L);};
lastmaxval=maxval;
maxval=0;