Revision 0:6460a0d26927, committed 2017-02-17

Comitter:

DimpleB05

Date:

Fri Feb 17 06:07:42 2017 +0000

Child:

1:0861a46b5654

Commit message:

readtactilesensor_total256values;

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 17 06:07:42 2017 +0000
@@ -0,0 +1,120 @@
+// Debug version that outputs ASCII at a slow 20Hz
+// Has a feature to measure amount of time needed to output 100 frames
+
+// Please select NUCLEO-F303K8 as the target device
+
+#include "mbed.h"
+
+#define FPS
+#define BAUD        460800
+#define N_CHANNELS  256
+
+AnalogIn in(A0);
+
+DigitalOut mux_ch0(D6), mux_ch1(D4), mux_ch2(D8), mux_ch3(D9);
+DigitalOut mux_en(D5);
+
+DigitalOut reg_din(D10);
+DigitalOut reg_clk(D11);
+DigitalOut reg_clr(D12);
+
+DigitalOut led(D13);
+Timer timer;
+Serial pc(USBTX,USBRX);
+
+int in_value = 0;
+int value_sum = 0;
+uint8_t mux_ch_map[16] = {6,7,5,4,0,1,2,3,14,12,13,15,8,9,11,10};
+
+int counter = 0;
+int tmr_start, tmr_end;
+uint8_t mux_val;
+
+int main()
+{
+    pc.baud(BAUD);
+    
+   // pc.printf("Nucleo 16x16 basic raster\r\n");
+   // pc.printf("Initializing...\r\n");
+    // reset registers and intialize peripherals
+    mux_en = 0;  // power off mux
+    mux_ch0 = 0;
+    mux_ch1 = 0;
+    mux_ch2 = 0;
+    mux_ch3 = 0;
+    led = 0;
+
+    reg_din = 0;
+    reg_clr = 0; // reset register
+    reg_clk = 0;
+
+    wait_ms(100);
+    mux_en = 1;
+    reg_clr = 1;
+    wait_ms(100);
+    //pc.printf("Clock speed: %d\r\n", SystemCoreClock);
+    //pc.printf("Started scanning\r\n");
+
+    // do a single read using original read_u16 code
+    in_value = in.read_u16();
+    
+    // benchmark
+    timer.start();
+    tmr_start = timer.read_us();
+
+    while(1) {
+        for (int row=0; row<16; row++) {
+//             0 connects trace to ground. Only 1 grounded trace per cycle is needed.
+
+            if(row == 0) {
+                //pc.printf("\n");
+                led = !led; // blink to indicate operation
+                reg_din.write(1);
+            } else {
+                reg_din.write(0);
+            }
+
+            // bit-bashing the register clock
+            reg_clk.write(1);
+            
+            // send out data while fulfilling t_hold of register
+            wait_us(1);
+            
+            // 2nd part of bit-bashing clock
+            reg_clk.write(0);
+            
+/* Wait period after reading 100 frames
+#ifdef FPS            
+            // benchmarking only if FPS is defined
+            if(row == 0) {
+                counter++;
+
+                if(counter >= 100) {
+                    tmr_end = timer.read_us();
+                    pc.printf("Elapsed: %d us after %d frames\r\n", tmr_end-tmr_start, counter);
+                    wait_ms(5000);
+                    tmr_start = timer.read_us();
+                    counter = 0;
+                }
+            }
+#endif
+*/
+            for (int col=0; col<16; col++) {
+                mux_val = mux_ch_map[15-col];
+                mux_ch0.write(mux_val & 0x01);
+                mux_ch1.write((mux_val >> 1) & 0x01);
+                mux_ch2.write((mux_val >> 2) & 0x01);
+                mux_ch3.write((mux_val >> 3) & 0x01);
+                wait_us(1);
+                in_value = in.read_u16()>>4;
+                // Add a variable to add the in_value
+                value_sum = value_sum + in_value;
+               // pc.printf("%d,",in_value);
+            }            
+         }
+         //Total 256 values
+            pc.printf("%d,",value_sum);
+            value_sum =0;
+    }          
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Feb 17 06:07:42 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/ef9c61f8c49f
\ No newline at end of file