From 215aa9092564cabb11cc323e2560e0ae20a11667 Mon Sep 17 00:00:00 2001
From: "leon.bohnwagner" <leon.bohnwagner@informatik.hs-fulda.de>
Date: Thu, 13 Feb 2025 01:38:00 +0100
Subject: [PATCH] fix: add send byte control bits
---
kernel/kmod.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 875c2dc..d36d71b 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -76,13 +76,20 @@ static enum hrtimer_restart timer_callback(struct hrtimer *timer) {
return HRTIMER_RESTART;
}
+static void send_bit(uint8_t bit) {
+ gpio_set_value(GPIO_PIN, bit);
+ udelay(1);
+}
+
static void send_byte(uint8_t byte) {
+ send_bit(0);
+
for (int i = 0; i < 8; i++) {
int bit = (byte >> (7 - i)) & 1;
-
- gpio_set_value(GPIO_PIN, bit);
- udelay(1);
+ send_bit(bit);
}
+
+ send_bit(1);
}
static void send_data(const void *data, size_t length) {
@@ -170,7 +177,7 @@ static int __init lkm_init(void)
printk(KERN_ALERT "Failed to request GPIO pin\n");
return -1;
}
- gpio_direction_output(GPIO_PIN, 0);
+ gpio_direction_output(GPIO_PIN, 1);
timed_thread = kthread_run(timed_thread_fn, NULL, "timed_thread");
if (IS_ERR(timed_thread)) {
--
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