István Cserny
This is a simple Generic HID demo, which is more or less compatible with the USB HID PnP demo example from the Microchip Applications Library, so that the PC application from that package can be used with our firmware as well (after two small modification). The differences: 1. We use 12 bit ADC resolution (instead of 10 bit) 2. We use Vid=0x0483, Pid=0x5750 which are the official STM32 Custom Human Interface Device identifiers from ST Microelectronics.
Diff: main.cpp
- Revision:
- 0:471646bf5f7e
- Child:
- 1:86e3171a1f42
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Jun 16 12:51:10 2022 +0000
@@ -0,0 +1,61 @@
+/* LAB10_USBHID_pnp
+ *
+ * This is a simple Generic HID demo, which is more or less
+ * compatible with the USB HID PnP demo example from the
+ * Microchip Applications Library, so that the PC application
+ * from that package can be used with our firmware as well
+ * (after two small modification).
+ *
+ * The differences:
+ * - We use 12 bit ADC resolution (instead of 10 bit)
+ * - We use Vid=0x0483, Pid=0x5750 which are the official
+ * STM32 Custom Human Interface Device identifiers from
+ * ST Microelectronics.
+ */
+
+#include "mbed.h"
+#include "USBHID.h"
+
+//We declare a USBHID device. Here the input and output reports are 64 bytes long.
+USBHID hid(64,64,0x0483,0x5750); // Vid/Pid: STM32 Custom Human Interface Device
+
+HID_REPORT send_report; //This report will contain data to be sent
+HID_REPORT recv_report; //This report will contain data received
+
+DigitalOut LED_1(LED1); //Buitin KED at PA5
+DigitalIn SW1(BUTTON1,PullUp); //Builtin button at PC13
+AnalogIn adc(A0); //Analog input at A0 (PA0)
+
+int main(void) {
+ uint16_t val = 0;
+ send_report.length = 64;
+ LED_1 = 0;
+ for (int i = 0; i < send_report.length; i++) // Fill the report
+ send_report.data[i] = 0x00;
+ while (1) {
+ if(hid.readNB(&recv_report)) { // try to read a msg
+ switch(recv_report.data[0]) {
+ case 0x80: //Toggle LED state
+ LED_1 = !LED_1;
+ break;
+ case 0x81: //Get push button state
+ send_report.data[0] = recv_report.data[0];
+ send_report.data[1] = SW1;
+ send_report.data[2] = 0;
+ hid.send(&send_report); // Send the report
+ break;
+ case 0x37: //Read POT command.
+ send_report.data[0] = recv_report.data[0];
+ val = adc.read_u16()>>4; // Convert to 12-bits
+ send_report.data[1] = val & 0xFF; // Measured value LSB
+ send_report.data[2] = val >> 8; // Measured value MSB
+ hid.send(&send_report); // Send the report
+ break;
+ default: {
+ send_report.data[0] = 0xFF; // Invalid command
+ hid.send(&send_report); // Send the report
+ }
+ }
+ }
+ }
+}
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