saiteja dommeti
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testing_rtc
with one warning !!
Fork of testing_rtc by
main.cpp@0:cfecb0ebcc63, 2014-12-19 (annotated)
- Committer:
- duke970
- Date:
- Fri Dec 19 05:01:09 2014 +0000
- Revision:
- 0:cfecb0ebcc63
- Child:
- 1:620887c20cee
RTC test program
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
duke970 | 0:cfecb0ebcc63 | 1 | #include "mbed.h" |
duke970 | 0:cfecb0ebcc63 | 2 | SPI spi(PTD6, PTD7, PTD5); // mosi, miso, sclk |
duke970 | 0:cfecb0ebcc63 | 3 | DigitalOut cs(PTA13); |
duke970 | 0:cfecb0ebcc63 | 4 | |
duke970 | 0:cfecb0ebcc63 | 5 | |
duke970 | 0:cfecb0ebcc63 | 6 | int main() |
duke970 | 0:cfecb0ebcc63 | 7 | { |
duke970 | 0:cfecb0ebcc63 | 8 | |
duke970 | 0:cfecb0ebcc63 | 9 | |
duke970 | 0:cfecb0ebcc63 | 10 | |
duke970 | 0:cfecb0ebcc63 | 11 | // Setup the spi for 8 bit data, high steady state clock, |
duke970 | 0:cfecb0ebcc63 | 12 | // second edge capture, with a 1MHz clock rate |
duke970 | 0:cfecb0ebcc63 | 13 | spi.format(8,3); |
duke970 | 0:cfecb0ebcc63 | 14 | spi.frequency(1000000); |
duke970 | 0:cfecb0ebcc63 | 15 | |
duke970 | 0:cfecb0ebcc63 | 16 | // Send the commands to write to test the seconds register |
duke970 | 0:cfecb0ebcc63 | 17 | cs = 0; |
duke970 | 0:cfecb0ebcc63 | 18 | spi.write(0x80); // set write register to seconds |
duke970 | 0:cfecb0ebcc63 | 19 | spi.write(0x00); // send value of one |
duke970 | 0:cfecb0ebcc63 | 20 | |
duke970 | 0:cfecb0ebcc63 | 21 | //cs=1; |
duke970 | 0:cfecb0ebcc63 | 22 | //cs=0; |
duke970 | 0:cfecb0ebcc63 | 23 | spi.write(0x81); //write reg to minutes |
duke970 | 0:cfecb0ebcc63 | 24 | spi.write(0x00); |
duke970 | 0:cfecb0ebcc63 | 25 | |
duke970 | 0:cfecb0ebcc63 | 26 | //cs=1; |
duke970 | 0:cfecb0ebcc63 | 27 | //cs=0; |
duke970 | 0:cfecb0ebcc63 | 28 | |
duke970 | 0:cfecb0ebcc63 | 29 | spi.write(0x82); //write reg to minutes |
duke970 | 0:cfecb0ebcc63 | 30 | spi.write(0x00); |
duke970 | 0:cfecb0ebcc63 | 31 | |
duke970 | 0:cfecb0ebcc63 | 32 | cs=1; |
duke970 | 0:cfecb0ebcc63 | 33 | // Receive the contents of the seconds register |
duke970 | 0:cfecb0ebcc63 | 34 | |
duke970 | 0:cfecb0ebcc63 | 35 | for(int i=0;i<1000000;i++){ |
duke970 | 0:cfecb0ebcc63 | 36 | |
duke970 | 0:cfecb0ebcc63 | 37 | |
duke970 | 0:cfecb0ebcc63 | 38 | cs=0; |
duke970 | 0:cfecb0ebcc63 | 39 | spi.write(0x00); // set read register to seconds |
duke970 | 0:cfecb0ebcc63 | 40 | int seconds = spi.write(0x00); // read the value |
duke970 | 0:cfecb0ebcc63 | 41 | |
duke970 | 0:cfecb0ebcc63 | 42 | //cs=1; |
duke970 | 0:cfecb0ebcc63 | 43 | //cs=0; |
duke970 | 0:cfecb0ebcc63 | 44 | |
duke970 | 0:cfecb0ebcc63 | 45 | spi.write(0x01); |
duke970 | 0:cfecb0ebcc63 | 46 | int minutes =spi.write(0x01); |
duke970 | 0:cfecb0ebcc63 | 47 | |
duke970 | 0:cfecb0ebcc63 | 48 | //cs=1; |
duke970 | 0:cfecb0ebcc63 | 49 | //cs=0; |
duke970 | 0:cfecb0ebcc63 | 50 | |
duke970 | 0:cfecb0ebcc63 | 51 | spi.write(0x02); |
duke970 | 0:cfecb0ebcc63 | 52 | int hours =spi.write(0x01); |
duke970 | 0:cfecb0ebcc63 | 53 | |
duke970 | 0:cfecb0ebcc63 | 54 | //This cs=1 is to make the chipselect line high to "deselect" the slave in our case RTC |
duke970 | 0:cfecb0ebcc63 | 55 | cs = 1; |
duke970 | 0:cfecb0ebcc63 | 56 | |
duke970 | 0:cfecb0ebcc63 | 57 | //This printf function is to check the timestamp function in the terminal output |
duke970 | 0:cfecb0ebcc63 | 58 | printf("Seconds register = %X : %X : %X \n\r", hours,minutes,seconds); |
duke970 | 0:cfecb0ebcc63 | 59 | } |
duke970 | 0:cfecb0ebcc63 | 60 | |
duke970 | 0:cfecb0ebcc63 | 61 | return 0; |
duke970 | 0:cfecb0ebcc63 | 62 | |
duke970 | 0:cfecb0ebcc63 | 63 | |
duke970 | 0:cfecb0ebcc63 | 64 | |
duke970 | 0:cfecb0ebcc63 | 65 | } |