From 80d26ca9c1e8ec5c620285f29b1d2b1c76536b96 Mon Sep 17 00:00:00 2001
From: Jimmy Hu <jimmy.hu@tibbo.com>
Date: Tue, 24 Oct 2023 10:41:11 +0800
Subject: [PATCH] add support for legacy i2c implementation

---
 super_i2c/super_i2c.tbs | 122 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 119 insertions(+), 3 deletions(-)

diff --git a/super_i2c/super_i2c.tbs b/super_i2c/super_i2c.tbs
index c2bd3d3..90ec5bd 100644
--- a/super_i2c/super_i2c.tbs
+++ b/super_i2c/super_i2c.tbs
@@ -43,12 +43,21 @@ register_normal_slot:
 				si2c_in_use(f)=YES
 				si2c_user_signature(f)=signature
 				si2c_register=f
-
+#IF I2C_AVAILABLE
 				i2c.num=f
 				i2c.sdamap=sda
 				i2c.sclmap=scl
 				i2c.enabled=YES
-
+#ELSE
+				si2c_sda(f)=sda
+				si2c_scl(f)=scl
+				io.num=scl
+				io.state=HIGH
+				io.enabled=YES
+				io.num=sda
+				io.state=HIGH
+				io.enabled=NO
+#ENDIF
 				#if SI2C_DEBUG_PRINT
 					si2c_debugprint("'"+si2c_user_signature(f)+"' register i2c #"+str(f))
 				#endif
@@ -69,11 +78,23 @@ register_normal_slot:
 		si2c_in_use(f)=YES
 		si2c_user_signature(f)=signature
 		si2c_register=f
-
+#IF I2C_AVAILABLE
 		i2c.num=f
 		i2c.sdamap=sda
 		i2c.sclmap=scl
 		i2c.enabled=YES
+#ELSE
+		si2c_sda(f)=sda
+		si2c_scl(f)=scl
+		si2c_register=f
+
+		io.num=scl
+		io.state=HIGH
+		io.enabled=YES
+		io.num=sda
+		io.state=HIGH
+		io.enabled=NO
+#ENDIF
 
 		#if SI2C_DEBUG_PRINT
 			si2c_debugprint("'"+si2c_user_signature(f)+"' register i2c #"+str(f))
@@ -137,11 +158,30 @@ sub si2c_get(num as byte)
 end sub
 
 sub si2c_start()
+#IF I2C_AVAILABLE
 	i2c.start()
+#ELSE
+	io.num=si2c_sda(si2c_num)
+	io.enabled=YES
+	
+	io.lineset(si2c_scl(si2c_num),HIGH)
+	io.lineset(si2c_sda(si2c_num),HIGH)
+	io.lineset(si2c_sda(si2c_num),LOW)
+	io.lineset(si2c_scl(si2c_num),LOW)
+#ENDIF
 end sub
 
 sub si2c_stop()
+#IF I2C_AVAILABLE
 	i2c.stop()
+#ELSE
+	io.num=si2c_sda(si2c_num)
+	io.enabled=YES
+
+	io.lineset(si2c_sda(si2c_num),LOW)
+	io.lineset(si2c_scl(si2c_num),HIGH)
+	io.lineset(si2c_sda(si2c_num),HIGH)
+#ENDIF
 end sub
 
 sub si2c_write(data as byte)
@@ -150,7 +190,43 @@ sub si2c_write(data as byte)
 	dim BitData as boolean					'Comparison result (1 or 0)
 
 	if i2c.num>3 then
+#IF I2C_AVAILABLE	
 		i2c.write(data)
+#ELSE
+		compval = &h80						'Initialize the MASK
+
+		io.num = si2c_scl(si2c_num)			'Select SSI_CLK line
+		io.state = LOW						'Initialize the transmition
+
+		io.num = si2c_sda(si2c_num)			'Select SSI_SDA line
+		io.enabled=YES						'Set as output
+
+		for bitCnt = 0 to 7 step 1	
+			BitData = data AND compval		'Define the state of the bit(MSB-->LSB)
+			compval = compval / 2			'Move the comparision to the next bit(MSB-->LSB)
+
+			if(BitData) then 
+				io.state = HIGH				'Bit is 1
+			else 
+				io.state = LOW				'Bit is 0
+			end if
+
+			io.num = si2c_scl(si2c_num)		'Write the bit to I2C device
+			io.state = HIGH
+			io.invert(si2c_scl(si2c_num))
+
+			io.num = si2c_sda(si2c_num)		'Select SSI_SDA line, NOTE: this must be the last
+											'statement in the loop so we can release the SSI_SDA
+											'line as soon as possible to alow for the ack
+		next bitCnt
+
+		io.num = si2c_sda(si2c_num)
+		io.enabled=NO						'Set SSI_SDA as input to allow ack receive
+
+		io.num = si2c_scl(si2c_num)			'Emulate the ACK frame
+		io.state = HIGH
+		io.invert(si2c_scl(si2c_num))		'Finish the ACK frame
+#ENDIF
 	else
 		ssi.channel=i2c.num
 		ssi.str(chr(data),PL_SSI_ACK_RX)
@@ -162,7 +238,47 @@ function si2c_read(acknak_request as boolean) as byte
 	dim compval as byte						'Value to compare - MASK
 
 	if i2c.num>3 then
+#IF I2C_AVAILABLE
 		si2c_read = i2c.read(acknak_request)
+#ELSE
+		si2c_read=0
+		compval=&h80							'Initialize the MASK
+
+		io.num=si2c_sda(si2c_num)				'Select SSI_SDA line
+		io.enabled=NO							'Set as input
+
+		io.num=si2c_scl(si2c_num)				'Select SSI_CLK line
+		io.state=LOW							'Initialize the transmition
+
+		for bitCnt=0 to 7 step 1
+			io.state=HIGH						'Read one bit from I2C device
+			io.num=si2c_sda(si2c_num)	
+			if(io.state=HIGH) then				'Devine the state of the bit
+				si2c_read=si2c_read OR compval	'Store the value of the bit
+			end if
+			compval=compval/2					'Move the comparision to the next bit(MSB-->LSB)
+
+			io.num=si2c_scl(si2c_num)
+			io.state=LOW						'Clear the clock line (the data can change now...)
+		next bitCnt
+
+		io.num = si2c_sda(si2c_num)				'Select SSI_SDA line
+		io.enabled=YES							'Enable SSI_DO as output
+
+		if acknak_request=TRUE then				'Does user want to send an ack or not
+			io.state = LOW						'Bring Low for ACK
+		else
+			io.state = HIGH						'Bring high for NACK
+		end if	
+
+		io.num=si2c_scl(si2c_num)				'Select SSI_CLK line
+		io.state=HIGH							'Set SSI_CLK line
+		io.invert(si2c_scl(si2c_num))			'Clear SSI_CLK line	
+
+#ENDIF
+		#if SI2C_DEBUG_PRINT
+			si2c_debugprint("i2c read data:"+ hex(si2c_read))
+		#endif
 	else
 		dim tmp as word=0
 		ssi.channel=i2c.num