Oliver Broad / Mbed 2 deprecated test_16is740i2c

Demonstration of very basic functions of sc16is740 UART connected via i2c. Demonstrates clock setting, input, output

Dependencies:   mbed

main.cpp@0:ef968b96c286, 2016-07-30 (annotated)

Committer:
oliverb
Date:
Sat Jul 30 13:28:03 2016 +0000
Revision:
0:ef968b96c286
Demo program runs

Who changed what in which revision?

UserRevisionLine numberNew contents of line
oliverb 0:ef968b96c286 1 #include "mbed.h"
oliverb 0:ef968b96c286 2
oliverb 0:ef968b96c286 3 I2C i2c(p28, p27);
oliverb 0:ef968b96c286 4
oliverb 0:ef968b96c286 5 const int addr = 0x90;
oliverb 0:ef968b96c286 6
oliverb 0:ef968b96c286 7 Serial pc(USBTX, USBRX); // tx, rx
oliverb 0:ef968b96c286 8
oliverb 0:ef968b96c286 9 BusOut myleds(LED1, LED2, LED3, LED4);
oliverb 0:ef968b96c286 10
oliverb 0:ef968b96c286 11 int writereg(int reg,int val)
oliverb 0:ef968b96c286 12 {
oliverb 0:ef968b96c286 13 i2c.start();
oliverb 0:ef968b96c286 14 i2c.write(addr);
oliverb 0:ef968b96c286 15 i2c.write(reg <<3);
oliverb 0:ef968b96c286 16 int aa=i2c.write(val);
oliverb 0:ef968b96c286 17 i2c.stop();
oliverb 0:ef968b96c286 18 return(aa);
oliverb 0:ef968b96c286 19 }
oliverb 0:ef968b96c286 20 int readreg(int reg)
oliverb 0:ef968b96c286 21 {
oliverb 0:ef968b96c286 22 i2c.start();
oliverb 0:ef968b96c286 23 i2c.write(addr);
oliverb 0:ef968b96c286 24 i2c.write(reg <<3);
oliverb 0:ef968b96c286 25 i2c.start();
oliverb 0:ef968b96c286 26 i2c.write(addr|1);
oliverb 0:ef968b96c286 27 int aa=i2c.read(0); //0=nack
oliverb 0:ef968b96c286 28 i2c.stop();
oliverb 0:ef968b96c286 29 return(aa);
oliverb 0:ef968b96c286 30 }
oliverb 0:ef968b96c286 31
oliverb 0:ef968b96c286 32
oliverb 0:ef968b96c286 33 int main()
oliverb 0:ef968b96c286 34 {
oliverb 0:ef968b96c286 35 {
oliverb 0:ef968b96c286 36 int bb;
oliverb 0:ef968b96c286 37 i2c.start();
oliverb 0:ef968b96c286 38 bb=i2c.write(addr);
oliverb 0:ef968b96c286 39 i2c.stop();
oliverb 0:ef968b96c286 40 pc.putc(48+bb);
oliverb 0:ef968b96c286 41 writereg(0x03,0x83); //LCR
oliverb 0:ef968b96c286 42 writereg(0x00,24); //DLL
oliverb 0:ef968b96c286 43 writereg(0x01,00); //DLH
oliverb 0:ef968b96c286 44 bb=readreg(0x00); //DLL
oliverb 0:ef968b96c286 45 bb|=readreg(1)<<8; //DLH
oliverb 0:ef968b96c286 46 pc.printf("baud %d ",bb);
oliverb 0:ef968b96c286 47 writereg(0x03,0x03); //LCR
oliverb 0:ef968b96c286 48 // writereg(0x02,0x01); //FCR
oliverb 0:ef968b96c286 49 pc.printf("lsr: %d ",readreg(0x05)); //LSR
oliverb 0:ef968b96c286 50 while(1)
oliverb 0:ef968b96c286 51 {
oliverb 0:ef968b96c286 52 int aa=readreg(0x05); //LSR
oliverb 0:ef968b96c286 53 if ((aa & 0x20) && pc.readable())
oliverb 0:ef968b96c286 54 {
oliverb 0:ef968b96c286 55 writereg(0x00,pc.getc()); //THR
oliverb 0:ef968b96c286 56 //pc.printf("fifo: %d",readreg(0x08)); //TXLVL
oliverb 0:ef968b96c286 57 }
oliverb 0:ef968b96c286 58 if ((aa & 0x01) && pc.writeable())
oliverb 0:ef968b96c286 59 {
oliverb 0:ef968b96c286 60 pc.putc(readreg(0x00)); //RHR
oliverb 0:ef968b96c286 61
oliverb 0:ef968b96c286 62 }
oliverb 0:ef968b96c286 63 }
oliverb 0:ef968b96c286 64
oliverb 0:ef968b96c286 65
oliverb 0:ef968b96c286 66
oliverb 0:ef968b96c286 67 }
oliverb 0:ef968b96c286 68
oliverb 0:ef968b96c286 69
oliverb 0:ef968b96c286 70 }
oliverb 0:ef968b96c286 71