X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=tv_i2c_hack;a=blobdiff_plain;f=src%2Fi2c.c;fp=src%2Fi2c.c;h=c37dd1868f2c0ed1b4801dfd987f381c903e6a25;hp=c7af41db615c0147b490491e4905559b9798fc53;hb=4fca6c11e173901b79a38c431db6717857231b22;hpb=f324577af4726c9c233f269391c1b9487605a349

diff --git a/src/i2c.c b/src/i2c.c
index c7af41d..c37dd18 100644
--- a/src/i2c.c
+++ b/src/i2c.c
@@ -3,10 +3,14 @@
 #include <avr/interrupt.h>
 #include "i2c.h"
 
+#define PC_SDA	0x10
+#define PC_SCL	0x20
+
 enum {
 	I2C_IDLE,
 	I2C_MASTER_WRITE,
-	I2C_MASTER_READ
+	I2C_MASTER_READ,
+	I2C_HOLD	= 0xff
 };
 
 enum {
@@ -326,13 +330,22 @@ void i2c_check_async(void)
 void i2c_hold(void)
 {
 	TWCR = 0;		/* make sure the AVR i2c hardware is disabled */
-	DDRC = 0x20;	/* ... and drive SCL pin low */
-	PORTC = 0;
+	DDRC |= PC_SCL;	/* ... and drive SCL pin low */
+	PORTC &= ~PC_SCL;
+
+	i2c_mode = I2C_HOLD;
 }
 
 void i2c_release(void)
 {
-	DDRC = 0;
+	DDRC &= ~PC_SCL;
+
+	i2c_mode = I2C_IDLE;
+}
+
+unsigned char i2c_isheld(void)
+{
+	return i2c_mode == I2C_HOLD;
 }
 
 void i2c_abort(void)