diff --git a/software/CMakeLists.txt b/software/CMakeLists.txt
index b7c40a4..f1dc851 100644
--- a/software/CMakeLists.txt
+++ b/software/CMakeLists.txt
@@ -4,4 +4,4 @@ find_package(Zephyr)
 project(cryosnom1)
 include_directories("../firmware")
 
-target_sources(app PRIVATE src/main.c)
+target_sources(app PRIVATE src/io.c src/dac_adc_test_main.c)
diff --git a/software/src/dac_adc_test_main.c b/software/src/dac_adc_test_main.c
new file mode 100644
index 0000000..53f0d7c
--- /dev/null
+++ b/software/src/dac_adc_test_main.c
@@ -0,0 +1,211 @@
+#include <zephyr/zephyr.h>
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+#include <stdbool.h>
+#include "pin_io.h"
+#include "io.h"
+
+LOG_MODULE_REGISTER(dac_adc_test_main);
+
+#define ATTEMPTS 5
+
+static bool dac_ready[DAC_MAX] = {0};
+
+static void
+init_dacs(void)
+{
+	for (size_t i = 0; i < DAC_MAX; i++) {
+		for (int j = 0; j < ATTEMPTS; j++) {
+			if (dac_init(i)) {
+				LOG_INF("DAC #%zu initialized, attempt %d\n", i, j);
+				dac_ready[i] = 1;
+				break;
+			}
+		}
+
+		if (!dac_ready[i])
+			LOG_WRN("DAC #%zu disconnected!\n", i);
+	}
+}
+
+K_MUTEX_DEFINE(print_mutex);
+
+static void
+print_mutex_unlock_impl(const char *func)
+{
+	if (k_mutex_unlock(&print_mutex) != 0) {
+		LOG_ERR("Fatal error in mutex_unlock in %s\n", func);
+		k_fatal_halt(K_ERR_KERNEL_PANIC);
+	}
+}
+
+#define print_mutex_unlock() print_mutex_unlock_impl(__func__)
+
+struct dac_info {
+	float lo;
+	float hi;
+	unsigned num;
+};
+
+#ifdef PRINT_DAC
+#define MAX_DAC (1 << 20) - 1
+
+static void
+print_dac(const struct dac_info *info, uint32_t val)
+{
+	k_mutex_lock(&print_mutex, K_FOREVER);
+
+	float volt = (info->hi - info->lo) * val / MAX_DAC
+	             + info->lo;
+	LOG_PRINTK("DAC\t%u\t%f\n", info->num, volt);
+
+	print_mutex_unlock();
+}
+#endif
+
+static void
+dac_thread(void *p1, void *p2, void *p3)
+{
+	ARG_UNUSED(p2);
+	ARG_UNUSED(p3);
+
+	const struct dac_info *info = p1;
+	uint32_t val = (1 << 19);
+	int incr = 1;
+#ifdef PRINT_DAC
+	int print_cntr = 0;
+#endif
+
+	for (;;) {
+		dac_write_v(info->num, val);
+		if (val == 0xFFFFF) {
+			incr = -1;
+		} else if (val == 0) {
+			incr = 1;
+		}
+		val += incr;
+#ifdef PRINT_DAC
+		if (print_cntr == 8000) {
+			print_cntr = 0;
+			print_dac(info);
+		}
+#endif
+		k_sleep(K_NSEC(125));
+	}
+}
+
+struct adc_info {
+	float hi;
+	unsigned num;
+	unsigned wid;
+};
+
+static void
+print_adc(const struct adc_info *info, int32_t val)
+{
+	k_mutex_lock(&print_mutex, K_FOREVER);
+
+	const uint32_t bitnum = (1 << info->wid) - 1;
+	float volt = info->hi / bitnum * val;
+	LOG_PRINTK("ADC\t%u\t%f\n", info->num, volt);
+
+	print_mutex_unlock();
+}
+
+static void
+adc_thread(void *p1, void *p2, void *p3)
+{
+	ARG_UNUSED(p2);
+	ARG_UNUSED(p3);
+	const struct adc_info *info = p1;
+	int32_t v;
+
+	for (;;) {
+		v = adc_read(info->num, info->wid);
+		print_adc(info, v);
+		k_sleep(K_MSEC(1000));
+	}
+}
+
+#define MK_DAC_INFO(n, lo, hi) [n] = {lo, hi, n}
+const struct dac_info dac_info[DAC_MAX] = {
+	MK_DAC_INFO(0, -10, 10),
+	MK_DAC_INFO(1, -10, 10),
+	MK_DAC_INFO(2, -10, 10),
+	MK_DAC_INFO(3, -10, 10),
+	MK_DAC_INFO(4, -10, 10),
+	MK_DAC_INFO(5, -10, 10),
+	MK_DAC_INFO(6, -10, 10),
+	MK_DAC_INFO(7, -10, 10)
+};
+
+#undef MK_DAC_INFO
+
+#define STACKSIZ 2048
+#define MKSTACK(name, num) \
+	K_THREAD_STACK_DEFINE(name##_stk_##num, STACKSIZ)
+
+#define DAC_STACK(n) MKSTACK(dac, n)
+DAC_STACK(0);
+DAC_STACK(1);
+DAC_STACK(2);
+DAC_STACK(3);
+DAC_STACK(4);
+DAC_STACK(5);
+DAC_STACK(6);
+DAC_STACK(7);
+#undef DAC_STACK
+
+const struct adc_info adc_info[ADC_MAX] = {
+	// TODO
+};
+
+#define ADC_STACK(n) MKSTACK(adc, n)
+ADC_STACK(0);
+ADC_STACK(1);
+ADC_STACK(2);
+ADC_STACK(3);
+ADC_STACK(4);
+ADC_STACK(5);
+ADC_STACK(6);
+ADC_STACK(7);
+#undef ADC_STACK
+
+#undef MKSTACK
+
+void
+main(void)
+{
+	struct k_thread dac_tids[8];
+	struct k_thread adc_tids[8];
+
+	LOG_PRINTK("DAC ADC test program.\n");
+	init_dacs();
+
+#define CREATE_THREAD(name, num) \
+	k_thread_create(&name##_tids[num], \
+			(k_thread_stack_t *) name##_stk_##num,        \
+			K_THREAD_STACK_SIZEOF(&name##_stk_##num),     \
+			name##_thread, &name##_info[num], NULL, NULL, \
+			-1, 0, K_MSEC(10))
+
+	CREATE_THREAD(dac, 0);
+	CREATE_THREAD(dac, 1);
+	CREATE_THREAD(dac, 2);
+	CREATE_THREAD(dac, 3);
+	CREATE_THREAD(dac, 4);
+	CREATE_THREAD(dac, 5);
+	CREATE_THREAD(dac, 6);
+	CREATE_THREAD(dac, 7);
+
+	CREATE_THREAD(adc, 0);
+	CREATE_THREAD(adc, 1);
+	CREATE_THREAD(adc, 2);
+	CREATE_THREAD(adc, 3);
+	CREATE_THREAD(adc, 4);
+	CREATE_THREAD(adc, 5);
+	CREATE_THREAD(adc, 6);
+	CREATE_THREAD(adc, 7);
+
+#undef CREATE_THREAD
+}