v 0.4
Dependents: MCP23S17Test MCP23S17_Basic_IO_Demo HelloWorld Lab3-SnakeGame ... more
Revision 0:930da696072e, committed 2010-08-18
- Comitter:
- romilly
- Date:
- Wed Aug 18 12:30:39 2010 +0000
- Child:
- 1:5abd129839e7
- Commit message:
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 |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Wed Aug 18 12:30:39 2010 +0000 @@ -0,0 +1,46 @@ +#include "mbed.h" + +/* first attempt at driving an MCP23S17 +* +* Turns alternate bits of B register on and off +* +* I have not added many comments yet. +* This is a proof of concept, +* not a finished example. +*/ + +DigitalOut myled(LED1); + +SPI spi(p5, p6, p7); +DigitalOut ncs(p20); + +void write(char command, char address, char data) { + ncs = 0; + spi.write(command); + spi.write(address); + spi.write(data); + ncs = 1; +} + +void init() { + write(0x40, 0x0A, 0xA0); + write(0x40, 0x10, 0x00); +} + +void output(char byte) { + ncs = 0; + write(0x40,0x1A, byte); // configures for multi-write - could send a series of bytes for immediate output + ncs = 1; +} + +int main() { + init(); + while(1) { + myled = 1; + wait(0.2); + output(0xAA); + myled = 0; + wait(0.2); + output(0x55); + } +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Aug 18 12:30:39 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/9114680c05da