A B
code for testing 6172
Diff: main.cpp
- Revision:
- 0:2ac336d8094b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Aug 24 06:48:09 2016 +0000
@@ -0,0 +1,158 @@
+// This is the code for the RENBED microcontroller board which is connected to the LMAB Measurement Board V1.0
+// RENISHAW d.o.o.
+// ab138110; adam.balkan@renishaw.com
+// August 2016
+
+#include "mbed.h"
+#include "USBSerial.h"
+
+USBSerial pc; // For talking to the PC
+SPI dac_adc_link(P1_22, P1_21, P1_20); // MOSI, MISO, SCLK (for talking to the DAC)
+DigitalOut DAC_CS(P1_26); // CS (chip select) for selecting the DAC
+DigitalInOut OEb(P1_14); // Output enable active low
+DigitalInOut LE(P0_17); // Latch enable active low
+DigitalInOut PDb(P0_7); // Power down active low
+
+char command = 0x00; // stores the command that was sent from the PC
+char param_p1 = 0x00; // stores the first "parameter" byte from the PC
+char param_p2 = 0x00; // stores the second "parameter" byte from the PC
+char param_p3 = 0x00; // stores the third "parameter" byte from the PC
+char param_p4 = 0x00; // stores the fourth "parameter" byte from the PC
+
+void Disconnect_PDb()
+{
+ PDb.input(); // by connecting PDb as an input, we effectively make it "open"
+ PDb.mode(PullNone); // we need to make sure that there is no pull-up or pull down resistor on PDb when it is open
+}
+
+void Disconnect_OEb()
+{
+ OEb.input(); // by connecting OEb as an input, we effectively make it "open"
+ OEb.mode(PullNone); // we need to make sure that there is no pull-up or pull down resistor on OEb when it is open
+}
+
+void Disconnect_LE()
+{
+ LE.input(); // by connecting LE as an input, we effectively make it "open"
+ LE.mode(PullNone); // we need to make sure that there is no pull-up or pull-down resistor on LE when it is open
+}
+
+void Connect_PDb()
+{
+ PDb.output(); // to re-connect PDb we configure it as an output
+}
+
+void Connect_OEb()
+{
+ OEb.output(); // to re-connect OEb we configure it as an output
+}
+
+void Connect_LE()
+{
+ LE.output(); // to re-connect LE we configure it as an output
+}
+
+
+void send_analog_data_to_pc(char id, char data1, char data2)
+{
+ pc.putc(id); // ID of analog output
+ pc.putc(data1); // Part 1 of analog output
+ pc.putc(data2); // Part 2 of analog output
+ pc.putc(13); // Carriage return
+ wait_ms(100);
+}
+
+
+void SET_ASIC_VDD(int desired_value) // sets ASIC VDD using DAC MCP4921
+{
+
+ char command_register_msb = (0x70); // 01110000 for DAC A, BUF, Gain =1 and no shutdown
+ command_register_msb = ((command_register_msb)|desired_value>>8); // assign first 4 bits to first byte to send
+ char command_register_lsb = desired_value; // assign last 8 bits to second byte to send
+ DAC_CS =0; // bring CS low
+ int junk= dac_adc_link.write(command_register_msb); // write first byte
+ junk= dac_adc_link.write(command_register_lsb); // write second byte
+ DAC_CS=1; // De-select device
+ wait_ms(100); // wait for 100 ms
+}
+
+
+int main() {
+ dac_adc_link.format(8,0); // Specify that the SPI link to the DAC should be 8 bits long and be in mode 0
+ Connect_PDb(); // On start-up, connect PDb
+ Connect_LE(); // On start-up, connect LE
+ Connect_OEb(); // On start-up, connect OEb
+ PDb = 1; // Power down is inactive on start up
+ LE = 1; // Latch enable is disabled on start up
+ OEb = 0; // Output enable is enabled on start up
+ DAC_CS = 1; // DAC is deselected on start-up
+
+ while(1) {
+
+ if (pc.readable()){ // If the PC has sent a command to the Renbed...
+
+ command = pc.getc(); // Data from PC (command) (the first byte)
+ param_p1 = pc.getc(); // Data from PC (param p1) (the second byte)
+ param_p2 = pc.getc(); // Data from PC (param p2) (the third byte)
+ param_p3 = pc.getc(); // Data from PC (param p2) (the fourth byte)
+ param_p4 = pc.getc(); // Data from PC (param p2) (the fifth byte)
+ int scrap = pc.getc(); // Carriage Return (the sixth byte) (we scrap this byte)
+
+ if (command=='E') // request to change ASIC VDD
+ {
+ int desired_value = 256*param_p3+param_p4; // represents desired ASIC VDD as an integer between 0 (0V) and 4096 (5V) for example 2703 is 3.3 volts
+ SET_ASIC_VDD(desired_value);
+ send_analog_data_to_pc('E', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='Z') // toggle PDb
+ {
+ PDb = !PDb;
+ send_analog_data_to_pc('Z', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='X') // toggle latch enable
+ {
+ LE =!LE;
+ send_analog_data_to_pc('X', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='C') // toggle output enable
+ {
+ OEb = !OEb;
+ send_analog_data_to_pc('C', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='O') // Disconnect PDb (make it open)
+ {
+ Disconnect_PDb();
+ send_analog_data_to_pc('O', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='F') // Disconnect OEb (make it open)
+ {
+ Disconnect_OEb();
+ send_analog_data_to_pc('F', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='W') // Disconnect LE (make it open)
+ {
+ Disconnect_LE();
+ send_analog_data_to_pc('W', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='o') // Connect PDb
+ {
+ Connect_PDb();
+ send_analog_data_to_pc('o', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='f') // Connect OEb
+ {
+ Connect_OEb();
+ send_analog_data_to_pc('f', 0x00, 0x00); // lower part followed by upper part
+ }
+ else if (command=='w') // Connect LE
+ {
+ Connect_LE();
+ send_analog_data_to_pc('w', 0x00, 0x00); // lower part followed by upper part
+ }
+ else
+ {
+ pc.printf("Invalid command\n"); // if an unrecognised command was sent from the PC
+ }
+ }
+ }
+}