kota sato / Mbed 2 deprecated Nucleo_mcp3204test

This is test program of mcp3204. This is operating normally.

Dependencies:   mbed MCP320x TextLCD

Nucleo_mcp3204test.cpp@0:55aac36c4f0f, 2016-01-28 (annotated)

Committer:
SK_ROBO_
Date:
Thu Jan 28 05:34:51 2016 +0000
Revision:
0:55aac36c4f0f
Child:
1:50f0c5749724
corrected the mistake of bit shift.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
SK_ROBO_ 0:55aac36c4f0f 1 #include "mbed.h"
SK_ROBO_ 0:55aac36c4f0f 2
SK_ROBO_ 0:55aac36c4f0f 3 SPI spi(D11, D12, D13); // mosi(out), miso(in), sclk(clock)
SK_ROBO_ 0:55aac36c4f0f 4 DigitalOut cs(D10); // cs (the chip select signal)
SK_ROBO_ 0:55aac36c4f0f 5
SK_ROBO_ 0:55aac36c4f0f 6 Serial pc(USBTX, USBRX); // tx, rx ( the usb serial communication )
SK_ROBO_ 0:55aac36c4f0f 7
SK_ROBO_ 0:55aac36c4f0f 8 int main() {
SK_ROBO_ 0:55aac36c4f0f 9 // Setup the spi for 7 bit data, high steady state clock,
SK_ROBO_ 0:55aac36c4f0f 10 // second edge capture, with a 1MHz clock rate
SK_ROBO_ 0:55aac36c4f0f 11 spi.format(7,0);
SK_ROBO_ 0:55aac36c4f0f 12 spi.frequency(1000000);
SK_ROBO_ 0:55aac36c4f0f 13
SK_ROBO_ 0:55aac36c4f0f 14 // notify the user that we are starting with the ADC communication
SK_ROBO_ 0:55aac36c4f0f 15 pc.printf("Starting ADC interaction\n");
SK_ROBO_ 0:55aac36c4f0f 16
SK_ROBO_ 0:55aac36c4f0f 17 // lets just do this forever
SK_ROBO_ 0:55aac36c4f0f 18 while (1) {
SK_ROBO_ 0:55aac36c4f0f 19
SK_ROBO_ 0:55aac36c4f0f 20 // Select the device by seting chip select low
SK_ROBO_ 0:55aac36c4f0f 21 cs = 0;
SK_ROBO_ 0:55aac36c4f0f 22
SK_ROBO_ 0:55aac36c4f0f 23 // sending the 6 bits + 1 bit to ignore the null bit
SK_ROBO_ 0:55aac36c4f0f 24 // coming from the device, so the data that is sent is 1100000
SK_ROBO_ 0:55aac36c4f0f 25 spi.write(0x60);
SK_ROBO_ 0:55aac36c4f0f 26
SK_ROBO_ 0:55aac36c4f0f 27 // now the device sends back the readings 12 bits, 7 bits at a time
SK_ROBO_ 0:55aac36c4f0f 28 uint8_t high = spi.write(0x00);
SK_ROBO_ 0:55aac36c4f0f 29 uint8_t low = spi.write(0x00);
SK_ROBO_ 0:55aac36c4f0f 30
SK_ROBO_ 0:55aac36c4f0f 31 // shift out the right bits
SK_ROBO_ 0:55aac36c4f0f 32 low = ( high << 5 ) | (low >> 2);
SK_ROBO_ 0:55aac36c4f0f 33 high = high >> 3;
SK_ROBO_ 0:55aac36c4f0f 34
SK_ROBO_ 0:55aac36c4f0f 35 // shift and or the result together
SK_ROBO_ 0:55aac36c4f0f 36 int value = ( high << 7 ) | low;
SK_ROBO_ 0:55aac36c4f0f 37
SK_ROBO_ 0:55aac36c4f0f 38 // and voila we have the value and we can print it for the user
SK_ROBO_ 0:55aac36c4f0f 39 pc.printf("sensor 0 value = %u\n", value);
SK_ROBO_ 0:55aac36c4f0f 40
SK_ROBO_ 0:55aac36c4f0f 41 // Deselect the device
SK_ROBO_ 0:55aac36c4f0f 42 cs = 1;
SK_ROBO_ 0:55aac36c4f0f 43
SK_ROBO_ 0:55aac36c4f0f 44 // delay some time before reading again
SK_ROBO_ 0:55aac36c4f0f 45 wait(1);
SK_ROBO_ 0:55aac36c4f0f 46 }
SK_ROBO_ 0:55aac36c4f0f 47 }