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:
- 42:da85c17ea495
- Parent:
- 41:b7c84115a2dd
- Child:
- 76:fcbc456010e0
--- a/main.cpp Tue Oct 21 03:55:34 2014 +0000
+++ b/main.cpp Tue Aug 30 16:30:55 2016 +0000
@@ -1,151 +1,683 @@
-#include "mbed.h"
-//#define isuse_USB_SERIAL
+/** uart_i2c_conv for LPC824
+*/
-#ifdef isuse_USB_SERIAL
-#include "USBSerial.h"
-USBSerial pc;
-#else
-Serial pc(USBTX,USBRX);
-#endif
-I2C dev1(p9,p10);
-I2C dev2(p28,p27);
-I2C* dev=&dev1;
-BusOut bus(LED1,LED2);
-
+#include "mbed.h"
+#include "settings.h"
//Table 3. ASCII commands supported by SC18IM700
//ASCII command Hex value Command function
//[X] S 0x53 I2C-bus START
-//[X] P 0x50 I2C-bus STOP
-//[_] R 0x52 read SC18IM700 internal register
-//[_] W 0x57 write to SC18IM700 internal register
-//[_] I 0x49 read GPIO port
-//[_] O 0x4F write to GPIO port
+//[X] P 0x50 I2C/SPI-bus STOP
+//[X] R 0x52 read SC18IM700 internal register
+//[X] W 0x57 write to SC18IM700 internal register
+//[?] I 0x49 read GPIO port
+//[?] O 0x4F write to GPIO port
//[_] Z 0x5A power down
+//[X] C 0x43 change channel
+//[_] E 0x45 SPI transfer start
+//[_] V 0x__ enable VDDIO output to chip
+/**
+"C| '0'| P"
+"C| '1'| P"
+"C| '2'| P"
+"C| '3'| P"
+"S| 0x_8 _0| 0x_0 _4| 0x_D _E _A _D _B _E _A _F| P"
+"S| 0x_8 _0| 0x_0 _4| 0x_D _E _A _D _B _E _A _F| S| 0x_8 _1| 0x_0 _4| P"
+"S| 0x_8 _1| 0x_0 _4| P"
+"R| '0'| P"
+"R| '0'| '1'| ...| P"
+"W| '0' 0x_a _a| P"
+"W| '0' 0x_a _a| '1' 0x_b _b| ...| P"
+"I| '0'| P"
+"O| '0'| 0x_a _a| P"
+"E| 0x_0 _4| 0x_0 _0| 0x_D _E _A _D _B _E _A _F| P" //write
+"E| 0x_0 _4| 0x_0 _4| 0x_D _E _A _D _B _E _A _F| P" //write and read
+*/
int main()
{
-#ifndef isuse_USB_SERIAL
+ I2C* dev = &dev1;
+
+#ifdef isUART
pc.baud(115200);
#endif
- dev1.frequency(100000);//100k
- dev2.frequency(100000);//100k
+ _spi.frequency(8000000);
+
+ bool s = false;
+ dev1.frequency(400000);//800k; works around 940kHz with 200ohm pullups/ not work at 1M?
+#if defined(TARGET_SSCI824) || defined(TARGET_LP824MAX)
+ dev1.frequency(800000);//800k; works around 940kHz with 200ohm pullups/ not work at 1M?
+ LPC_IOCON->PIO0_11 &= ~(0x03<<8);
+ LPC_IOCON->PIO0_11 |= (0x02<<8);
+ LPC_IOCON->PIO0_10 &= ~(0x03<<8);
+ LPC_IOCON->PIO0_10 |= (0x02<<8);
+#elif defined(TARGET_MCU_LPC11U35_501) || defined(TARGET_LPC11U35_401)
+ dev1.frequency(800000);//800k; works around 940kHz with 200ohm pullups/ not work at 1M?
+ LPC_IOCON->PIO0_4 &= ~(0x03<<8);
+ LPC_IOCON->PIO0_4 |= (0x02<<8);
+ LPC_IOCON->PIO0_5 &= ~(0x03<<8);
+ LPC_IOCON->PIO0_5 |= (0x02<<8);
+#endif
+
+#ifdef isI2C2
+ dev2.frequency(400000);//400k
+#endif
+#ifdef isI2C3
+ dev3.frequency(400000);//400k
+#endif
+#ifdef isI2C4
+ dev4.frequency(400000);//400k
+#endif
+#ifdef isGPIO1
+ DigitalInOut* gpio1[] = {
+ &_GPIO10,
+ &_GPIO11,
+ &_GPIO12,
+ &_GPIO13,
+ &_GPIO14,
+ &_GPIO15,
+ &_GPIO16,
+ &_GPIO17,
+ };
+ for(int k = 0; k < 8; k++){
+ gpio1[k]->input();
+ gpio1[k]->mode( PullUp );
+ }
+#endif
+
+ DigitalInOut* gpio0[] = {
+ &_GPIO00,
+ &_GPIO01,
+ &_GPIO02,
+ &_GPIO03,
+ &_GPIO04,
+ &_GPIO05,
+ &_GPIO06,
+ &_GPIO07,
+ };
+ for(int k = 0; k < 8; k++){
+ gpio0[k]->input();
+ gpio0[k]->mode( PullUp );
+ }
- int plength=0;
- char recieve[256];
- char read=0;
- int address=0,length=0,channel=0;
- enum reg {
- I2C0adr='0',
- I2C1adr='1',
- I2C2adr='2',
- I2C3adr='3',
+ int ack = 0;
+ int plength = 0;
+ int recieve[256];
+ char send[256];
+ for(int k = 0; k < 256; k+=4){
+ // cafe moca
+ recieve[k+0] = send[k+0] = 0xC4;
+ recieve[k+1] = send[k+1] = 0xFE;
+ recieve[k+2] = send[k+2] = 0xE0;
+ recieve[k+3] = send[k+3] = 0xCA;
+ }
+
+ int read = 0;
+ int address = 0;
+ int data = 0;
+ int _data = 0;
+ int length = 0;
+ int channel = 0;
+ int format = 8;
+ int enabled = 0;
+ int disabled = 0;
+ enum command_e {
+ CMD_S='S',
+ CMD_P='P',
+ CMD_C='C',
+ CMD_R='R',
+ CMD_W='W',
+ CMD_I='I',
+ CMD_O='O',
+ CMD_E='E',
};
+ enum channel_e {
+ CH0 = '0',
+ CH1 = '1',
+ CH2 = '2',
+ CH3 = '3',
+ };
+ enum register_e {
+ CHIP_ID = '0',
+ GPIO0_STAT = '1',
+ GPIO1_STAT = '2',
+ GPIO0_CONF = '3',
+ GPIO1_CONF = '4',
+ I2C_CONF = '5',
+ SPI_CONF = '6',
+ REG7,
+ REG8,
+ REG9,
+ };
+// enum chipID_e {
+// ID_LPC824 = '0',
+// ID_LPC1768 = '1',
+// ID_LPC11UXX = '2',
+// };
+// static const uint8_t chip_id=ID_LPC824;
+ static uint8_t registers[]={
+ chip_id,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0xFF,
+ 0x70,
+ REG7,
+ REG8,
+ REG9,
+ };
+
int i=0;
while(1) {
+ i=0;
+ length=0;
while(true) {
- read=pc.getc();
- recieve[i]=read;
-//pc.printf("%02X,",read);
+ read = pc.getc();
+ recieve[i] = read;
i++;
if(read == 'P') {
- plength=i;
-//pc.printf("P\n\r");
+ plength = i;
break;
}
}
i=0;
- while(i<plength) {
+ while(i < plength) {
switch(recieve[i]) {
- case 'C':
+ case CMD_C:
+ {
+ s = false;
channel=recieve[i+1];
switch(channel) {
- case I2C0adr:
- bus=0x01;
-//pc.printf("ch0 is selected,");
- channel='0';
- dev=&dev1;
+ case CH0:
+ {
+ channel = CH0;
+ dev = &dev1;
break;
- case I2C1adr:
- bus=0x02;
-//pc.printf("ch1 is selected,");
- channel='1';
- dev=&dev2;
+ }
+#ifdef isI2C2
+ case CH1:
+ {
+ channel = CH1;
+ dev = &dev2;
break;
-/** LPC1768 has only two I2C channels
- case I2C2adr:
- bus=0x04;
-//pc.printf("ch2 is not implemented,");
- channel='0';
- //dev=&dev3;
+ }
+#endif
+#ifdef isI2C3
+ case CH2:
+ {
+ channel = CH2;
+ dev = &dev3;
break;
- case I2C3adr:
- bus=0x08;
-//pc.printf("ch3 is not implemented,");
- channel='0';
- //dev=&dev4;
+ }
+#endif
+#ifdef isI2C4
+ case CH3:
+ {
+ channel = CH3;
+ dev = &dev4;
break;
-*/
+ }
+#endif
default:
- channel='0';
- dev=&dev1;
+ {
+ channel = CH0;
+ dev = &dev1;
break;
+ }
}
- i+=(2);
+ i += 2;
+ break;
+ }
+ case CMD_S:
+ {
+ s = true;
+ ack = plength - 2 - (i+1) + (recieve[i+2] & 0x01);
+ if(ack >= 4){ //valid packet
+ address = 0xff & (recieve[i+1] << 4 | (recieve[i+2] & 0x0F));
+ length = 0xff & (recieve[i+3] << 4 | (recieve[i+4] & 0x0F));
+
+ if(address & 0x01) { //read
+ ack = dev->read(address, send, length, false); //added
+ send[length] = ack;
+ length += 1;
+ i += 5;
+ } else { // write
+ for(int j = 0; j < (length * 2); j+=2) {
+ ack = 0xff&((recieve[5+j] << 4) | (recieve[6+j] & 0x0F));
+ *(send+(j/2)) = ack; //added
+ }
+ ack = dev->write(address, send, length, true); //added
+ i += (5 + length * 2);
+ send[0] = ack;
+ length = 1;
+ }
+ }else{
+ pc.printf("bad packet! %d, %d, %02X, %d\n\r",plength,i,recieve[(i+2)]&0x0F,ack);
+ s = false;
+ i = plength;
+ }
+ break;
+ }
+ case CMD_P:
+ {
+ if(s){
+ dev->stop();
+ s = false;
+ if(send[length-1] == 0){
+ pc.printf("ACK,");
+ }else{
+ pc.printf("NAK,");
+ }
+ length--;
+ }
+ i = plength;
+ for(int j=0; j<length; j++) {
+ pc.printf("%02X,",send[j]);
+ }
+ pc.printf("ok\n\r");
break;
- case 'S':
- address=recieve[i+1];
- length=recieve[i+2];
-//pc.printf("addr=%02X, length=%d,",address,length);
- dev->start();
- dev->write(address);
- if( (address&0x01)) {//read
-//pc.printf("read from ch%c,",channel);
- for(int j=0; j<length; j++) {
- pc.putc(dev->read(0));
-//pc.printf("%02X,",dev->read(0));
+ }
+ case CMD_R:
+ {
+ s = false;
+ length = plength - 2;
+ if(length < 1){
+ pc.printf("bad packet! %d\n\r",length);
+ i = plength + 1;
+ length = 0;
+ }else{
+ for(int j = 0; j < length; j++){
+ address = recieve[i+1+j];
+ switch(address){
+ case CHIP_ID:
+ {
+ data = chip_id;
+ break;
+ }
+ case GPIO0_STAT:
+ {
+ for(int k = 0; k < 8; k++){
+ _data = gpio0[k]->read();
+ data |= (_data << k);
+ }
+ registers[GPIO0_STAT-'0'] = data;
+ break;
+ }
+ case GPIO0_CONF:
+ {
+ data = registers[GPIO0_CONF-'0'];
+ break;
+ }
+#ifdef isGPIO1
+ case GPIO1_STAT:
+ {
+ for(int k = 0; k < 8; k++){
+ _data = gpio1[k]->read();
+ data |= (_data << k);
+ }
+ registers[GPIO1_STAT-'0'] = data;
+ break;
+ }
+ case GPIO1_CONF:
+ {
+ data = registers[GPIO1_CONF-'0'];
+ break;
+ }
+#endif
+ case I2C_CONF:
+ {
+ data = registers[I2C_CONF-'0'];
+ break;
+ }
+ case SPI_CONF:
+ {
+ data = registers[SPI_CONF-'0'];
+ break;
+ }
+ default:
+ {
+ data = 0xAA;
+ break;
+ }
+ }
+ send[j] = (char)data;
+ data = 0;
}
- i+=(3);
- } else {//write
-//pc.printf("write to ch%c, ",channel);
- for(int j=0; j<length; j++) {
-//pc.printf("%02X,",recieve[3+j]);
- dev->write(recieve[3+j]);
- }
- i+=(3+length);
+ i += (length+1);
}
break;
- case 'P':
- dev->stop();
- i=plength;
- pc.printf("ok\n\r");
- break;
- case 'R':
- pc.printf("command R is not implemented\n\r");
- i=plength;
+ }
+ case CMD_W:
+ {
+ s = false;
+ length = plength - 2;
+ if(length < 3){
+ pc.printf("bad packet! %d\n\r",length);
+ i = plength + 1;
+ length = 0;
+ }else{
+ for(int j = 0; j < length; j +=3){
+ address = recieve[i+1+j];
+ data = 0xff & (recieve[i+2+j] << 4 | (recieve[i+3+j] & 0x0F));
+ _data = 0;
+ switch(address){
+ case CHIP_ID:
+ {
+ //READ ONLY: do nothing
+ data = registers[CHIP_ID-'0'];
+ break;
+ }
+ case GPIO0_STAT:
+ {
+ _data = registers[GPIO0_CONF-'0'];
+ for(int k=0; k<8; k++){
+ if(_data&0x01){ // output
+ gpio0[k]->write((data>>k)&0x01);
+ }else{ // input
+ ; // do nothing
+ }
+ _data >>= 1;
+ }
+ break;
+ }
+ case GPIO0_CONF:
+ {
+ registers[GPIO0_CONF-'0'] = data;
+ for(int k = 0; k < 8; k++){
+ if(data & 0x01){//output
+ gpio0[k]->output();
+ }else{//input
+ gpio0[k]->input();
+ gpio0[k]->mode(PullUp);
+ }
+ data >>= 1;
+ }
+ data = registers[GPIO0_CONF-'0'];
+ break;
+ }
+#ifdef isGPIO1
+ case GPIO1_STAT:
+ {
+ _data = registers[GPIO1_CONF-'0'];
+ for(int k = 0; k < 8; k++){
+ if(_data & 0x01){ // output
+ gpio1[k]->write((data>>k)&0x01);
+ }else{ // input
+ ; // do nothing
+ }
+ _data >>= 1;
+ }
+ break;
+ }
+ case GPIO1_CONF:
+ {
+ registers[GPIO1_CONF-'0'] = data;
+ for(int k = 0; k < 6; k++){
+ if(data & 0x01){//output
+ gpio1[k]->output();
+ }else{//input
+ gpio1[k]->input();
+ gpio1[k]->mode(PullUp);
+ }
+ data >>= 1;
+ }
+ data = registers[GPIO1_CONF-'0'];
+ break;
+ }
+#endif
+ case I2C_CONF:
+ {
+ registers[I2C_CONF-'0'] = data;
+#if defined(TARGET_LPC1768)
+ dev1.frequency(100000 * ((0x03 & (data >> 6)) + 1));
+#else
+ dev1.frequency(200000 * ((0x03 & (data >> 6)) + 1));
+#endif
+#ifdef isI2C2
+ dev2.frequency(100000 * ((0x03 & (data >> 4)) + 1));
+#endif
+#ifdef isI2C3
+ dev3.frequency(100000 * ((0x03 & (data >> 2)) + 1));
+#endif
+#ifdef isI2C4
+ dev4.frequency(100000 * ((0x03 & (data >> 0)) + 1));
+#endif
+ break;
+ }
+ case SPI_CONF:
+ {
+ registers[SPI_CONF-'0'] = data;
+ format = ((data & 0x04) + 4) << 1;
+ _spi.format(format, 0x03 & (data));
+ _spi.frequency(1000000 * ((0x07 & (data >> 4)) + 1));
+ enabled = (data & 0x08) >> 3;
+ /*
+ 7 not used
+ 6:4 frequency
+ 3 CE pol
+ 2 word size(0=8bit,1=16bit)
+ 1:0 pol(corresponds to spi.format())
+ */
+ disabled = ~enabled;
+ break;
+ }
+ default:
+ {
+ break;
+ }
+ }
+ send[j/3] = data;
+ }
+ i += (length + 1);
+ length /= 3;
+ }
break;
- case 'W':
- pc.printf("command W is not implemented\n\r");
- i=plength;
+ }
+ case CMD_I:
+ {
+ s = false;
+ length = plength - 2;
+ if(length < 1){
+ pc.printf("bad packet! %d\n\r",length);
+ i = plength + 1;
+ length = 0;
+ }else{
+ for(int j=0; j<length; j++){
+ address = recieve[i+1+j];
+ _data=0;
+ switch(address){
+ case GPIO0_STAT:
+ {
+ for(int k=0; k<8; k++){
+ _data = gpio0[k]->read();
+ data |= (_data << k);
+ }
+ registers[GPIO0_STAT-'0'] = data;
+ break;
+ }
+#ifdef isGPIO1
+ case GPIO1_STAT:
+ {
+ for(int k=0; k<8; k++){
+ _data = gpio1[k]->read();
+ data |= (_data << k);
+ }
+ registers[GPIO1_STAT-'0'] = data;
+ break;
+ }
+#endif
+ default:
+ {
+ data = 0xAA;
+ break;
+ }
+ }
+ send[j] = (char)data;
+ data = 0;
+ }
+ i += (length+1);
+ }
break;
- case 'I':
- pc.printf("command I is not implemented\n\r");
- i=plength;
+ }
+ case CMD_O:
+ {
+ s = false;
+ length = plength - 2;
+ if(length < 3){
+ pc.printf("bad packet! %d\n\r",length);
+ i = plength + 1;
+ length = 0;
+ }else{
+ for(int j=0; j<length; j+=3){
+ address = recieve[i+1+j];
+ data = 0xff & (recieve[i+2+j] << 4 | (recieve[i+3+j] & 0x0F));
+ switch(address){
+ case GPIO0_STAT:
+ {
+ _data = registers[GPIO0_CONF-'0'];
+ for(int k=0; k<8; k++){
+ if(_data&0x01){ // output
+ gpio0[k]->write(data&0x01);
+ }else{ // input
+ ; // do nothing
+ }
+ data >>= 1;
+ _data >>= 1;
+ }
+ break;
+ }
+#ifdef isGPIO1
+ case GPIO1_STAT:
+ {
+ _data = registers[GPIO1_CONF-'0'];
+ for(int k=0; k<8; k++){
+ if(_data&0x01){ // output
+ gpio1[k]->write(data&0x01);
+ }else{ // input
+ ; // do nothing
+ }
+ data >>= 1;
+ _data >>= 1;
+ }
+ break;
+ }
+#endif
+ default:
+ {
+ break;
+ }
+ }
+ send[j/3] = data;
+ }
+ }
+ i += (length+1);
+ length /= 3;
+// pc.printf("command O is not implemented, ");
break;
- case 'O':
- pc.printf("command O is not implemented\n\r");
- i=plength;
+ }
+ case CMD_E:
+ {
+ s = false;
+ /*
+ "0| 1 2| 3 4| 5 6 7 8 9 10 11 12|13" //plength=14
+ "E| 0x_0 _1| 0x_0 _0| 0x_D _E| P" //minimum plength=8
+ "E| 0x_0 _1| 0x_0 _0| 0x_D _E|_A _D| P" //minimum plength=10(16bit)
+ "E| 0x_0 _4| 0x_0 _0| 0x_D _E _A _D _B _E _A _F| P" //write
+ "E| 0x_0 _4| 0x_0 _4| 0x_D _E _A _D _B _E _A _F| P" //write and read
+ */
+ length = plength - 2; //6
+ if(length < 6){
+ pc.printf("bad packet! %d\n\r",length);
+ i = plength + 1;
+ length = 0;
+ }else{
+ length = length-4; //actual data in packet
+ data = 0xff & ((recieve[i+1]<<4) | (recieve[i+2]&0x0F)); // write length
+ read = 0xff & ((recieve[i+3]<<4) | (recieve[i+4]&0x0F)); // read length
+ switch(format){
+ case 8:
+ {
+ _cs.write(enabled);
+ for(int j = 0; j < length; j += 2){
+ _data = 0xff & ((recieve[i+5+j+0]<<4) | (recieve[i+5+j+1]&0x0F));
+ ack = _spi.write(_data);
+// pc.printf("s%02X,",_data);
+ send[j/2] = ack;
+ }
+ for(int j = length; j < (length+2*read); j+=2){
+ ack = _spi.write(0xAA); //dummy data to write
+// pc.printf("a%02X,",ack);
+ send[j/2] = ack;
+ }
+ _cs.write(disabled);
+ break;
+ }
+ case 16:
+ {
+ if((data%2) || (read%2)){ //invalid
+ pc.printf("bad packet! %d, %d\n\r",data,read);
+ i = plength + 1;
+ length = 0;
+ }else{
+ _cs.write(enabled);
+ for(int j = 0; j < length; j += 4){
+ _data = 0xffff & (((recieve[i+5+j+0] & 0x0F)<<12)|
+ ((recieve[i+5+j+1] & 0x0F)<<8 )|
+ ((recieve[i+5+j+2] & 0x0F)<<4 )|
+ ((recieve[i+5+j+3] & 0x0F)<<0 )
+ );
+ ack = _spi.write(_data);
+// pc.printf("s%04X,",_data);
+ send[(j/2)+0] = 0xFF & (ack>>8);
+ send[(j/2)+1] = 0xFF & (ack>>0);
+ }
+ for(int j = length; j < (length+2*read); j += 4){
+ ack = _spi.write(0xAAAA); //dummy data to write
+// pc.printf("a%04X,",ack);
+ send[(j/2)+0] = 0xFF & (ack>>8);
+ send[(j/2)+1] = 0xFF & (ack>>0);
+ }
+ _cs.write(disabled);
+ }
+ break;
+ }
+ default:
+ {
+ pc.printf("this shold not happen %d\n\r",format);
+ break;
+ }
+
+ }
+// pc.printf("command E is for SPI transmission\n\r");
+ length = read + data;
+ i = (plength-1);
+ }
break;
+ }
case 'Z':
+ {
+ s = false;
pc.printf("command Z is not implemented\n\r");
i=plength;
break;
- default:
- pc.printf("command ? is not implemented\n\r");
+ }
+ case 'V':
+ {
+ s = false;
+ pc.printf("command V is not implemented\n\r");
i=plength;
break;
+ }
+ default:
+ {
+ s = false;
+ pc.printf("command %c is not implemented\n\r", recieve[i]);
+ i=plength;
+ break;
+ }
}
}
i=0;
-
+ length=0;
}
}