py converted to c

snippets/test1/Makefile

@@ -0,0 +1,17 @@
+CC=gcc
+
+CFLAGS=-Wall
+LDFLAGS=-lwiringPi
+
+test1:	test1.o
+	$(CC) -o $@ $(LDFLAGS) $^
+
+.c.o:
+	$(CC) $(CFLAGS) -c $<
+
+.PHONY: all
+all:	test1
+
+.PHONY: clean
+clean:
+	-rm -f *.o test1

snippets/test1/test1.c

@@ -1,4 +1,63 @@
 #include <wiringPi.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
+
+const int CTRL_OUT = 16;
+const int INTR_IN  = 19;
+const int SPI_CHAN = 0;
+const int SPI_SPEED = 1000000;
+
+const uint8_t REG_MDR0 = 0b00001000;
+const uint8_t REG_MDR1 = 0b00010000;
+const uint8_t REG_DTR  = 0b00011000;
+const uint8_t REG_CNTR = 0b00100000;
+const uint8_t REG_OTR  = 0b00101000;
+const uint8_t REG_STR  = 0b00110000;
+
+const uint8_t CMD_CLR  = 0b00000000;
+const uint8_t CMD_RD   = 0b01000000;
+const uint8_t CMD_WR   = 0b10000000;
+const uint8_t CMD_LOAD = 0b11000000;
+
+const uint8_t STR_CY   = 0b10000000;
+const uint8_t STR_BW   = 0b01000000;
+const uint8_t STR_CMP  = 0b00100000;
+const uint8_t STR_IDX  = 0b00010000;
+const uint8_t STR_CEN  = 0b00001000;
+const uint8_t STR_PLS  = 0b00000100;
+const uint8_t STR_UD   = 0b00000010;
+const uint8_t STR_S    = 0b00000001;
+
+const uint8_t MDR0_NOQ = 0b00000000;
+const uint8_t MDR0_Q1  = 0b00000001;
+const uint8_t MDR0_Q2  = 0b00000010;
+const uint8_t MDR0_Q4  = 0b00000011;
+const uint8_t MDR0_FRC = 0b00000000;
+const uint8_t MDR0_SCC = 0b00000100;
+const uint8_t MDR0_RLC = 0b00001000;
+const uint8_t MDR0_MNC = 0b00001100;
+const uint8_t MDR0_DI  = 0b00000000;
+const uint8_t MDR0_ILC = 0b00010000;
+const uint8_t MDR0_IRC = 0b00100000;
+const uint8_t MDR0_ILO = 0b00110000;
+const uint8_t MDR0_AI  = 0b00000000;
+const uint8_t MDR0_SI  = 0b01000000;
+const uint8_t MDR0_FC1 = 0b00000000;
+const uint8_t MDR0_FC2 = 0b10000000;
+
+const uint8_t MDR1_4CM = 0b00000000;
+const uint8_t MDR1_3CM = 0b00000001;
+const uint8_t MDR1_2CM = 0b00000010;
+const uint8_t MDR1_1CM = 0b00000011;
+const uint8_t MDR1_EC  = 0b00000000;
+const uint8_t MDR1_DC  = 0b00000100;
+const uint8_t MDR1_F_IDX = 0b00010000;
+const uint8_t MDR1_F_CMP = 0b00100000;
+const uint8_t MDR1_F_BW  = 0b01000000;
+const uint8_t MDR1_F_CY  = 0b10000000;
+
 
 void isr() {
 	static int t = 0;
@@ -6,12 +65,61 @@ void isr() {
 	t = ! t;
 }
 
+void writeCmd(c) {
+	uint8_t buf[1];
+	buf[0] = c;
+	wiringPiSPIDataRW(SPI_CHAN, buf, 1);
+}
+
+void writeCmdData(c, d) {
+	uint8_t buf[2];
+	buf[0] = c;
+	buf[1] = d;
+	wiringPiSPIDataRW(SPI_CHAN, buf, 2);
+}
+
+uint8_t read8(c) {
+  uint8_t buf[2];
+	buf[0] = c;
+  wiringPiSPIDataRW(SPI_CHAN, buf, 2);
+	return buf[1];
+}
+
+uint32_t read32(c) {
+	uint8_t buf[5];
+	buf[0] = c;
+	wiringPiSPIDataRW(SPI_CHAN, buf, 5);
+	uint32_t r = ((uint32_t)buf[1] << 24) | ((uint32_t)buf[2] << 16) | ((uint32_t)buf[3] << 8) | ((uint32_t)buf[4]);
+	return r;
+}
+
+void init() {
+	wiringPiSetupGpio();
+
+	wiringPiSPISetup(SPI_CHAN, SPI_SPEED);
+
+	pinMode(CTRL_OUT, OUTPUT);
+	digitalWrite(CTRL_OUT, 0);
+
+	pinMode(INTR_IN, INPUT);
+	wiringPiISR(INTR_IN, INT_EDGE_FALLING, isr);
+}
+
+void initCounter() {
+	writeCmd(CMD_CLR | REG_STR);
+	writeCmd(CMD_CLR | REG_CNTR);
+}
 
 int main (void) {
-	wiringPiSetupGpio() ;
-	pinMode(16, OUTPUT);
-	pinMode(19, INPUT);
-	wiringPiISR(19, INT_EDGE_FALLING, isr);
+	init();
+	initCounter();
 
-	while(1);
+	while (1) {
+		uint8_t str = read8(CMD_RD | REG_STR);
+		uint32_t cntr = read32(CMD_RD | REG_CNTR);
+
+		printf("%02x %ud\n", str, cntr);
+
+		sleep(1);
+	}
 }