Kazuki Yamamoto
UART to I2C master(s) converter, targetting to emulate SC18IM700(NXP) chip
UART to I2C master(s) converter, targetting to emulate SC18IM700(NXP) chip
Features
up to 4x I2C master
- for LPC824 implement, we can use up to 4 channels of I2C masters
- 1x Fm+ and 3x Fm I2C channels
- for LPC1768 implement, we can use up to 2 channels of I2C masters
- 2x Fm I2C channels
- for LPC11U35 implement, only one channel for I2C master,
but program uses USB CDC class for UART communication (means no external USB-Serial converter chip)
- 1x Fm+ I2C channels
1x SPI master
up to 2x 8bit GPIO
Tested Platforms
LPC824
- https://developer.mbed.org/platforms/Switch-Science-mbed-LPC824/
- https://developer.mbed.org/platforms/LPCXpresso824-MAX/
LPC1768
LPC11U35
Quote:
LPC11U35 implement requires importing USBDevice library to use USBSerial class
visit https://github.com/K4zuki/tinyI2C for more information
Diff: main.cpp
- Revision:
- 40:78e0ee75a604
- Parent:
- 39:5817c3e6ce1e
- Child:
- 41:b7c84115a2dd
--- a/main.cpp Fri Oct 17 20:48:15 2014 +0000
+++ b/main.cpp Tue Oct 21 03:55:14 2014 +0000
@@ -9,14 +9,8 @@
#endif
I2C dev1(p9,p10);
I2C dev2(p28,p27);
-//I2C dev3(A5,A4);
-//I2C dev4(A5,A4);
I2C* dev=&dev1;
-BusOut bus(LED1,LED2,LED3,LED4);
-//DigitalOut led1(LED1);
-//DigitalOut led2(LED2);
-//DigitalOut led3(LED3);
-//DigitalOut led4(LED4);
+BusOut bus(LED1,LED2);
//Table 3. ASCII commands supported by SC18IM700
//ASCII command Hex value Command function
@@ -36,11 +30,8 @@
dev1.frequency(100000);//100k
dev2.frequency(100000);//100k
- int data=0x50;
- int ack=0;
int plength=0;
char recieve[256];
- char send[256];
char read=0;
int address=0,length=0,channel=0;
enum reg {
@@ -49,25 +40,16 @@
I2C2adr='2',
I2C3adr='3',
};
-//"C0P"
-//"S(0x80)(4)(0xDEADBEAF)P"
-//"C1P"
-//"S(0x80)(4)(0xDEADBEAF)P"
-//"C2P"
-//"S(0x80)(4)(0xDEADBEAF)P"
-//"C3P"
-//"S(0x80)(4)(0xDEADBEAF)P"
-
int i=0;
while(1) {
while(true) {
read=pc.getc();
recieve[i]=read;
-// ser.printf("%02X,",read);
+//pc.printf("%02X,",read);
i++;
if(read == 'P') {
plength=i;
-// ser.printf("P\n\r");
+//pc.printf("P\n\r");
break;
}
}
@@ -79,29 +61,30 @@
switch(channel) {
case I2C0adr:
bus=0x01;
-// pc.printf("ch0 is selected,");
+//pc.printf("ch0 is selected,");
channel='0';
dev=&dev1;
break;
case I2C1adr:
bus=0x02;
-// pc.printf("ch1 is selected,");
-// pc.printf("ch1 is not implemented,");
+//pc.printf("ch1 is selected,");
channel='1';
dev=&dev2;
break;
+/** LPC1768 has only two I2C channels
case I2C2adr:
bus=0x04;
-// pc.printf("ch2 is not implemented,");
+//pc.printf("ch2 is not implemented,");
channel='0';
//dev=&dev3;
break;
case I2C3adr:
bus=0x08;
-// pc.printf("ch0 is not implemented,");
+//pc.printf("ch0 is not implemented,");
channel='0';
//dev=&dev4;
break;
+*/
default:
channel='0';
dev=&dev1;
@@ -112,22 +95,20 @@
case 'S':
address=recieve[i+1];
length=recieve[i+2];
-// pc.printf("addr=%02X, length=%d,",address,length);
+//pc.printf("addr=%02X, length=%d,",address,length);
dev->start();
dev->write(address);
if( (address&0x01)) {//read
-// pc.printf("read from ch%c,",channel);
+//pc.printf("read from ch%c,",channel);
for(int j=0; j<length; j++) {
pc.putc(dev->read(0));
-// send[j]=dev->read(0);
-// pc.printf("%02X,",dev->read(0));
+//pc.printf("%02X,",dev->read(0));
}
i+=(3);
} else {//write
-// pc.printf("write to ch%c, ",channel);
+//pc.printf("write to ch%c, ",channel);
for(int j=0; j<length; j++) {
-// send[j]=recieve[4+j];
-// pc.printf("%02X,",recieve[3+j]);
+//pc.printf("%02X,",recieve[3+j]);
dev->write(recieve[3+j]);
}
i+=(3+length);