started on the firmware, added BOM

[nixiedisp] / fw / src / main.c

diff --git a/fw/src/main.c b/fw/src/main.c
new file mode 100644 (file)
index 0000000..3c1bd55
--- /dev/null
+++ b/fw/src/main.c
@@ -0,0 +1,98 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+#include "serial.h"
+
+/* TODO before board arrive:
+ * - USB comms
+ * - RTC time/data setting
+ * - hack the digit drivers with 7seg?
+ */
+
+/* pin assignments
+ * B[0,2]: serial clock for the 3 shift registers
+ * B4: SPI MISO connected to RTC I/O pin
+ * B5: SPI SCK connected to RTC serial clock
+ *
+ * C0: serial data for the 3 shift registers
+ * C1: hour separator LEDs
+ * C2: RTC chip select (active high)
+ *
+ * D[2,7]: nixie dots
+ */
+#define PB_CK1         0x01
+#define PB_CK2         0x02
+#define PB_CK3         0x04
+#define PB_RTC_DATA    0x10
+#define PB_RTC_CK      0x20
+#define PC_SDATA       0x01
+#define PC_HRSEP       0x02
+#define PC_RTC_EN      0x04
+#define PD_ADOT                0x04
+#define PD_BDOT                0x08
+#define PD_CDOT                0x10
+#define PD_DDOT                0x20
+#define PD_EDOT                0x40
+#define PD_FDOT                0x80
+
+static void proc_cmd(char *input);
+
+static int echo;
+
+static char input[128];
+static unsigned char inp_cidx;
+
+
+int main(void)
+{
+       /* SPI (SS/MOSI/SCK) are outputs */
+       DDRB = ~PB_RTC_DATA;    /* port B all outputs except the RTC data line */
+       PORTB = 0;
+       DDRC = 0xff;                    /* port C all outputs */
+       PORTC = 0;
+       DDRD = 0xff;                    /* port D all outputs */
+       PORTD = 0;
+
+       /* init the serial port we use to talk to the host */
+       init_serial(38400);
+       sei();
+
+       for(;;) {
+               if(have_input()) {
+                       int c = getchar();
+                       if(echo) {
+                               putchar(c);
+                       }
+
+                       if(c == '\r' || c == '\n') {
+                               input[inp_cidx] = 0;
+                               proc_cmd(input);
+                               inp_cidx = 0;
+                       } else if(inp_cidx < sizeof input - 1) {
+                               input[inp_cidx++] = c;
+                       }
+               }
+       }
+       return 0;
+}
+
+static void proc_cmd(char *input)
+{
+       switch(input[0]) {
+       case 'e':
+               echo = input[1] == '1' ? 1 : 0;
+               printf("OK echo %s\n", echo ? "on" : "off");
+               break;
+
+       case '?':
+               puts("OK command help");
+               puts(" e 0|1: turn echo on/off");
+               break;
+
+       default:
+               printf("ERR unknown command: '%c'\n", input[0]);
+       }
+}