X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=nixiedisp;a=blobdiff_plain;f=fw%2Fsrc%2Fmain.c;fp=fw%2Fsrc%2Fmain.c;h=3c1bd557f7bc30665534dafabef48040848119a6;hp=0000000000000000000000000000000000000000;hb=ed24a7090a6cae59e1f877e61c20e62fda31ed4a;hpb=4b91815bc8db814e32e39cbca5dd09338a5b8234

diff --git a/fw/src/main.c b/fw/src/main.c
new file mode 100644
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]);
+	}
+}