位置情報を知るための電圧値を表示させる
Dependencies: mbed
adc.cpp
- Committer:
- sayan2
- Date:
- 2020-03-14
- Revision:
- 2:d665c2b3e24f
- Parent:
- 1:c3989f45366c
File content as of revision 2:d665c2b3e24f:
#include "mbed.h" SPI mySPI(D11, D12, A4); // mosi, miso, sclk DigitalOut cs(D10); Serial pc(USBTX, USBRX); // tx, rx double Vref = 5.0 ; int main(){ cs=1; mySPI.format(8,0); //Setup the spi for 10 bit data, spi mode 0 mySPI.frequency(1000000); // second edge capture, with a 1MHz clock rate int n=20; //size of "n" TBD int i; double sum_volts; while (1){ for(i=0;i<n;i++){ cs=0; int highByte = mySPI.write(0b01101000); //Send the command to recieve the slave data //pc.printf("highByte: %d ",highByte); int lowByte = mySPI.write(0xFF); // send dummy byte to receive the slave data //pc.printf("lowByte: %d ",lowByte); int wasteByte = mySPI.write(0x00); cs=1; int dataCh0 = ((highByte << 8) + lowByte) & 0x03FF; double volts = dataCh0*Vref / 1024; sum_volts = sum_volts + volts; } double ave_volts = sum_volts / n ; //get the average to reduce the error range pc.printf("CH0 %f V\n",ave_volts); sum_volts = 0.0; //initialize wait(3); //TBD } }