Chris Styles
Example of how it might be good to start with the DS1306
main.cpp@0:2a57c6fe6af8, 2010-03-10 (annotated)
- Committer:
- chris
- Date:
- Wed Mar 10 00:23:03 2010 +0000
- Revision:
- 0:2a57c6fe6af8
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| chris | 0:2a57c6fe6af8 | 1 | #include "mbed.h" |
| chris | 0:2a57c6fe6af8 | 2 | |
| chris | 0:2a57c6fe6af8 | 3 | DigitalOut myled(LED1); |
| chris | 0:2a57c6fe6af8 | 4 | |
| chris | 0:2a57c6fe6af8 | 5 | Serial pc (USBTX,USBRX); |
| chris | 0:2a57c6fe6af8 | 6 | |
| chris | 0:2a57c6fe6af8 | 7 | SPI spi (p5,p6,p7); |
| chris | 0:2a57c6fe6af8 | 8 | DigitalOut cs (p8); |
| chris | 0:2a57c6fe6af8 | 9 | |
| chris | 0:2a57c6fe6af8 | 10 | int main() { |
| chris | 0:2a57c6fe6af8 | 11 | |
| chris | 0:2a57c6fe6af8 | 12 | spi.format(8,2); |
| chris | 0:2a57c6fe6af8 | 13 | |
| chris | 0:2a57c6fe6af8 | 14 | // set initial state of CS pin |
| chris | 0:2a57c6fe6af8 | 15 | cs = 0; |
| chris | 0:2a57c6fe6af8 | 16 | wait (0.1); |
| chris | 0:2a57c6fe6af8 | 17 | |
| chris | 0:2a57c6fe6af8 | 18 | // start by clearing WP in Control register |
| chris | 0:2a57c6fe6af8 | 19 | // the RAM can not be accessed until WP is clear |
| chris | 0:2a57c6fe6af8 | 20 | |
| chris | 0:2a57c6fe6af8 | 21 | cs = 1; |
| chris | 0:2a57c6fe6af8 | 22 | wait (0.1); |
| chris | 0:2a57c6fe6af8 | 23 | spi.write (0x8f); // write to control register |
| chris | 0:2a57c6fe6af8 | 24 | spi.write(0x0); // clear all the bits |
| chris | 0:2a57c6fe6af8 | 25 | cs = 0; |
| chris | 0:2a57c6fe6af8 | 26 | |
| chris | 0:2a57c6fe6af8 | 27 | wait (0.1); |
| chris | 0:2a57c6fe6af8 | 28 | |
| chris | 0:2a57c6fe6af8 | 29 | // Now write to the RAM |
| chris | 0:2a57c6fe6af8 | 30 | cs = 1; |
| chris | 0:2a57c6fe6af8 | 31 | wait (0.1); |
| chris | 0:2a57c6fe6af8 | 32 | spi.write (0xA0); // write to first RAM location |
| chris | 0:2a57c6fe6af8 | 33 | spi.write(0xa5); // set a pattern |
| chris | 0:2a57c6fe6af8 | 34 | cs = 0; |
| chris | 0:2a57c6fe6af8 | 35 | |
| chris | 0:2a57c6fe6af8 | 36 | wait (0.1); |
| chris | 0:2a57c6fe6af8 | 37 | |
| chris | 0:2a57c6fe6af8 | 38 | // Now read from RAM |
| chris | 0:2a57c6fe6af8 | 39 | cs = 1; |
| chris | 0:2a57c6fe6af8 | 40 | wait (0.1); |
| chris | 0:2a57c6fe6af8 | 41 | spi.write (0x20); // read from first RAM location |
| chris | 0:2a57c6fe6af8 | 42 | char data = spi.write(0x00); |
| chris | 0:2a57c6fe6af8 | 43 | cs = 0; |
| chris | 0:2a57c6fe6af8 | 44 | |
| chris | 0:2a57c6fe6af8 | 45 | |
| chris | 0:2a57c6fe6af8 | 46 | printf("Read from location 0x20 and received 0x%X\n",data); |
| chris | 0:2a57c6fe6af8 | 47 | |
| chris | 0:2a57c6fe6af8 | 48 | |
| chris | 0:2a57c6fe6af8 | 49 | while (1) {} |
| chris | 0:2a57c6fe6af8 | 50 | |
| chris | 0:2a57c6fe6af8 | 51 | } |