5 files changed, 99 insertions, 8 deletions
diff --git a/src/micropeak/Makefile b/src/micropeak/Makefile
index 82944cb1..ff0a4499 100644
--- a/src/micropeak/Makefile
+++ b/src/micropeak/Makefile
@@ -50,7 +50,7 @@ IDPRODUCT=0
 PRODUCT=MicroPeak-v0.1
 PRODUCT_DEF=-DMICROPEAK
 CFLAGS = $(PRODUCT_DEF) -I. -I../attiny -I../core -I.. -I../drivers
-CFLAGS += -g -mmcu=$(MCU) -Wall -Wstrict-prototypes -O3 -mcall-prologues -DATTINY
+CFLAGS += -g -mmcu=$(MCU) -Wall -Wstrict-prototypes -O2 -mcall-prologues -DATTINY
 
 NICKLE=nickle
 
diff --git a/src/micropeak/ao_async.c b/src/micropeak/ao_async.c
index 04bba9e8..3556f54c 100644
--- a/src/micropeak/ao_async.c
+++ b/src/micropeak/ao_async.c
@@ -21,20 +21,51 @@
 #define AO_ASYNC_BAUD	38400l
 #define AO_ASYNC_DELAY	(uint8_t) (1000000l / AO_ASYNC_BAUD)
 
+#define LED_PORT	PORTB
+
+void
+ao_async_start(void)
+{
+	LED_PORT |= (1 << AO_LED_SERIAL);
+}
+
+void
+ao_async_stop(void)
+{
+	LED_PORT &= ~(1 << AO_LED_SERIAL);
+}
+
 void
 ao_async_byte(uint8_t byte)
 {
 	uint8_t		b;
 	uint16_t	w;
 
-	/* start bit */
-
-	/* start     data         stop */
-	w = 0x001 | (byte << 1) | 0x000;
+	/*    start           data           stop */
+	w = (0x000 << 0) | (byte << 1) | (0x001 << 9);
 
+	ao_arch_block_interrupts();
 	for (b = 0; b < 10; b++) {
-		ao_led_set((w & 1) << AO_LED_SERIAL);
+		uint8_t	v = LED_PORT & ~(1 << AO_LED_SERIAL);
+		v |= (w & 1) << AO_LED_SERIAL;
+		LED_PORT = v;
 		w >>= 1;
-		ao_delay_us(26);
+
+		/* Carefully timed to hit around 9600 baud */
+		asm volatile ("nop");
+		asm volatile ("nop");
+
+		asm volatile ("nop");
+		asm volatile ("nop");
+		asm volatile ("nop");
+		asm volatile ("nop");
+		asm volatile ("nop");
+
+		asm volatile ("nop");
+		asm volatile ("nop");
+		asm volatile ("nop");
+		asm volatile ("nop");
+		asm volatile ("nop");
 	}
+	ao_arch_release_interrupts();
 }
diff --git a/src/micropeak/ao_async.h b/src/micropeak/ao_async.h
index a06d2e1a..1b239712 100644
--- a/src/micropeak/ao_async.h
+++ b/src/micropeak/ao_async.h
@@ -19,6 +19,12 @@
 #define _AO_ASYNC_H_
 
 void
+ao_async_start(void);
+
+void
+ao_async_stop(void);
+
+void
 ao_async_byte(uint8_t byte);
 
 #endif /* _AO_ASYNC_H_ */
diff --git a/src/micropeak/ao_log_micro.c b/src/micropeak/ao_log_micro.c
index 40a7a35d..d665efb5 100644
--- a/src/micropeak/ao_log_micro.c
+++ b/src/micropeak/ao_log_micro.c
@@ -49,6 +49,46 @@ ao_log_micro_data(void)
 	}
 }
 
+#define POLY 0x8408
+
+static uint16_t
+ao_log_micro_crc(uint16_t crc, uint8_t byte)
+{
+	uint8_t	i;
+
+	for (i = 0; i < 8; i++) {
+		if ((crc & 0x0001) ^ (byte & 0x0001))
+			crc = (crc >> 1) ^ POLY;
+		else
+			crc = crc >> 1;
+		byte >>= 1;
+	}
+	return crc;
+}
+
+static void
+ao_log_hex_nibble(uint8_t b)
+{
+	if (b < 10)
+		ao_async_byte('0' + b);
+	else
+		ao_async_byte('a' - 10 + b);
+}
+
+static void
+ao_log_hex(uint8_t b)
+{
+	ao_log_hex_nibble(b>>4);
+	ao_log_hex_nibble(b&0xf);
+}
+
+static void
+ao_log_newline(void)
+{
+	ao_async_byte('\r');
+	ao_async_byte('\n');
+}
+
 void
 ao_log_micro_dump(void)
 {
@@ -56,13 +96,26 @@ ao_log_micro_dump(void)
 	uint16_t	nbytes;
 	uint8_t		byte;
 	uint16_t	b;
+	uint16_t	crc = 0xffff;
 
 	ao_eeprom_read(N_SAMPLES_OFFSET, &n_samples, sizeof (n_samples));
+	if (n_samples == 0xffff)
+		n_samples = 0;
 	nbytes = STARTING_LOG_OFFSET + sizeof (uint16_t) * n_samples;
+	ao_async_start();
 	ao_async_byte('M');
 	ao_async_byte('P');
 	for (b = 0; b < nbytes; b++) {
+		if ((b & 0xf) == 0)
+			ao_log_newline();
 		ao_eeprom_read(b, &byte, 1);
-		ao_async_byte(byte);
+		ao_log_hex(byte);
+		crc = ao_log_micro_crc(crc, byte);
 	}
+	ao_log_newline();
+	crc = ~crc;
+	ao_log_hex(crc >> 8);
+	ao_log_hex(crc);
+	ao_log_newline();
+	ao_async_stop();
 }
diff --git a/src/micropeak/ao_micropeak.c b/src/micropeak/ao_micropeak.c
index 3bbc7eea..f579a09a 100644
--- a/src/micropeak/ao_micropeak.c
+++ b/src/micropeak/ao_micropeak.c
@@ -19,6 +19,7 @@
 #include <ao_micropeak.h>
 #include <ao_ms5607.h>
 #include <ao_log_micro.h>
+#include <ao_async.h>
 
 static struct ao_ms5607_sample	sample;
 static struct ao_ms5607_value	value;