Oliver Broad
Demonstration of very basic functions of sc16is740 UART connected via i2c. Demonstrates clock setting, input, output
Revision 0:ef968b96c286, committed 2016-07-30
- Comitter:
- oliverb
- Date:
- Sat Jul 30 13:28:03 2016 +0000
- Commit message:
- Demo program runs
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r ef968b96c286 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Jul 30 13:28:03 2016 +0000
@@ -0,0 +1,71 @@
+#include "mbed.h"
+
+I2C i2c(p28, p27);
+
+const int addr = 0x90;
+
+Serial pc(USBTX, USBRX); // tx, rx
+
+BusOut myleds(LED1, LED2, LED3, LED4);
+
+int writereg(int reg,int val)
+{
+ i2c.start();
+ i2c.write(addr);
+ i2c.write(reg <<3);
+ int aa=i2c.write(val);
+ i2c.stop();
+ return(aa);
+}
+int readreg(int reg)
+{
+ i2c.start();
+ i2c.write(addr);
+ i2c.write(reg <<3);
+ i2c.start();
+ i2c.write(addr|1);
+ int aa=i2c.read(0); //0=nack
+ i2c.stop();
+ return(aa);
+}
+
+
+int main()
+{
+ {
+ int bb;
+ i2c.start();
+ bb=i2c.write(addr);
+ i2c.stop();
+ pc.putc(48+bb);
+ writereg(0x03,0x83); //LCR
+ writereg(0x00,24); //DLL
+ writereg(0x01,00); //DLH
+ bb=readreg(0x00); //DLL
+ bb|=readreg(1)<<8; //DLH
+ pc.printf("baud %d ",bb);
+ writereg(0x03,0x03); //LCR
+ // writereg(0x02,0x01); //FCR
+ pc.printf("lsr: %d ",readreg(0x05)); //LSR
+ while(1)
+ {
+ int aa=readreg(0x05); //LSR
+ if ((aa & 0x20) && pc.readable())
+ {
+ writereg(0x00,pc.getc()); //THR
+ //pc.printf("fifo: %d",readreg(0x08)); //TXLVL
+ }
+ if ((aa & 0x01) && pc.writeable())
+ {
+ pc.putc(readreg(0x00)); //RHR
+
+ }
+ }
+
+
+
+ }
+
+
+}
+
\ No newline at end of file
diff -r 000000000000 -r ef968b96c286 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Jul 30 13:28:03 2016 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/f9eeca106725 \ No newline at end of file