From ec5752b69ce25b0abb1bf4b8493b3e6078e41c1a Mon Sep 17 00:00:00 2001
From: Paul Goeser <ryx@rakka.de>
Date: Sat, 5 Feb 2011 00:50:37 +0100
Subject: [PATCH 1/2] i2c fixed

---
 firmware/slavechip/i2c_simple.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/firmware/slavechip/i2c_simple.c b/firmware/slavechip/i2c_simple.c
index 4523863..571ea60 100644
--- a/firmware/slavechip/i2c_simple.c
+++ b/firmware/slavechip/i2c_simple.c
@@ -2,14 +2,30 @@
 #include <avr/io.h>
 #include <avr/pgmspace.h>
 #include <util/twi.h>
+#include <util/delay.h>
 
 #include "i2c_simple.h"
+#include "debug.h"
+
+//#define I2C_WAIT() while(!(TWCR & _BV(TWINT)))
+#define I2C_WAIT() i2c_wait();
+
+
+void inline i2c_wait(){
+	uint16_t cntr=0;
+	while(!(TWCR & _BV(TWINT))){
+		cntr++;
+		if(cntr >= 1000){
+			dbgLog("i2c waittime exceeded!\n");
+		}
+	}
+}
+
 
-#define I2C_WAIT() while(!(TWCR & _BV(TWINT)))
 
 void i2c_init()
 {
-	TWBR = 32;//bit rate
+	TWBR = 32;//bit rate: 100kbit
 	TWSR = 0;//Prescaler
 	
 //	TWAR = 0x80;//our address 1000 000, don't listen to general call
@@ -53,6 +69,7 @@ uint8_t i2c_read(uint8_t addr, uint8_t len, uint8_t *data)
 	data[done] = TWDR;
 	done++;
 	TWCR |= _BV(TWINT) | _BV(TWSTO);
+	_delay_us(20); // wait about 2 bit periods
 	return done;
 }
 
@@ -91,6 +108,7 @@ uint8_t i2c_write_i(uint8_t addr, uint8_t len, uint8_t *data, uint8_t stop)
 	}
 	
 	if(stop) {TWCR |= _BV(TWINT) | _BV(TWSTO);}
+	_delay_us(20); // wait about 2 bit periods
 	return done;
 }
 

From 2ef03fc8f282857401ed2a369a1c0f43f97380ba Mon Sep 17 00:00:00 2001
From: Paul Goeser <ryx@rakka.de>
Date: Sat, 5 Feb 2011 00:50:51 +0100
Subject: [PATCH 2/2] successful temperature readout

---
 cmdline/read-temp.c              |  2 +-
 firmware/masterchip/spi_config.h |  2 +-
 firmware/slavechip/main.c        | 15 +++++++++++++++
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/cmdline/read-temp.c b/cmdline/read-temp.c
index fffcd8b..59f1702 100644
--- a/cmdline/read-temp.c
+++ b/cmdline/read-temp.c
@@ -166,7 +166,7 @@ int                 cnt, vid, pid;
 					fprintf(stderr, "%c", rxIndex);
 				}
 			}
-			usleep(1000);
+			usleep(100);
 		}
     } else {
 		usage();
diff --git a/firmware/masterchip/spi_config.h b/firmware/masterchip/spi_config.h
index 6cb5a59..adc910d 100644
--- a/firmware/masterchip/spi_config.h
+++ b/firmware/masterchip/spi_config.h
@@ -1,5 +1,5 @@
 
-#define SPI_BAUDRATE 10000
+#define SPI_BAUDRATE 30000
 #define SPI_MASTER
 #define SPI_SS_PORT D
 #define SPI_SS_PIN 7
diff --git a/firmware/slavechip/main.c b/firmware/slavechip/main.c
index f0e48d8..ae317b3 100644
--- a/firmware/slavechip/main.c
+++ b/firmware/slavechip/main.c
@@ -11,6 +11,9 @@ uint16_t bar;
 uint16_t timertmp;
 uint16_t temperatures[4];
 
+int32_t temp_avg_cumul;
+int16_t temp_avg_count;
+
 
 void baz() {
   foo++;
@@ -77,9 +80,21 @@ int __attribute__((noreturn)) main(void) {
 		if(mcpadc_has_new_data()) {
 			temperatures[0] = mcpadc_get_data();
 			temperatures[2]++;
+			int16_t temp = temperatures[0];
+			temp_avg_cumul += temp;
+			temp_avg_count += 1;
 		}
 		temperatures[1] = 22;
     }
+	SOFTTIMER(2,500){
+		int32_t temp = temp_avg_cumul;
+		temp /= temp_avg_count;
+		temp_avg_count = 0; temp_avg_cumul = 0;
+		int32_t nV = (temp * 625);
+		int32_t mK = nV/39;
+
+		dbgLog("temp: %6li (%li µV, %li mK)\n",temp,nV/1000, mK);
+	}
 
   }
 }