From cefd0601b91fa642163c82021d454b3c17d8adf4 Mon Sep 17 00:00:00 2001
From: Jan Sucan <sucanjan@fit.cvut.cz>
Date: Sun, 22 Sep 2019 21:17:50 +0200
Subject: Initial commit

---
 FanController/fan_controller/hw/eeprom.c | 120 +++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 FanController/fan_controller/hw/eeprom.c

(limited to 'FanController/fan_controller/hw/eeprom.c')

diff --git a/FanController/fan_controller/hw/eeprom.c b/FanController/fan_controller/hw/eeprom.c
new file mode 100644
index 0000000..dcad85c
--- /dev/null
+++ b/FanController/fan_controller/hw/eeprom.c
@@ -0,0 +1,120 @@
+/* Autor: Ján Sučan <jan@jansucan.sk>
+ * 
+ * Zdrojove kody, ich casti a subory z nich vzniknute priamo alebo nepriamo
+ * (objektove subory, Intel Hex, ...) prosim nepouzivajte komercne, ani ako
+ * sucast komercnych diel. Vsetky ostatne pripady pouzitia su dovolene.
+ *
+ * Please don't use the source codes, their parts and files created from them
+ * directly or indirectly, (object files, Intel Hex files, ...) for commercial
+ * purposes, not even as a part of commercial products. All other use cases
+ * are allowed.
+ */
+
+#include <avr/io.h>
+
+#include <fan_controller/hw/eeprom.h>
+#include <fan_controller/error.h>
+
+/** Velkost pamate EEPROM v bajtoch */
+#define EEPROM_SIZE_IN_BYTES  512U // bajtov
+
+static void eeprom_write_byte(uint16_t address, uint8_t byte);
+static void eeprom_read_byte(uint16_t address, uint8_t *const byte);
+static void eeprom_wait_until_ready(void);
+static void eeprom_check_address_and_size(uint16_t address, uint16_t op_size);
+
+/**
+ * @brief Zapis dat z EEPROM.
+ *
+ * @param address Adresa kam sa bude zapisovat.
+ * @param data Ukazovatel na buffer, odkial sa budu brat bajty pre zapis do EEPROM.
+ * @param data_size Pocet bajtov co sa budu zapisovat.
+ */
+void
+eeprom_write(uint16_t address, const uint8_t * const data, uint16_t data_size)
+{
+	eeprom_check_address_and_size(address, data_size);
+		
+	for (uint16_t i = 0; i < data_size; i++) {
+		eeprom_write_byte(address, data[i]);
+		++address;	
+	}
+}
+
+/**
+ * @brief Precitanie dat z EEPROM.
+ *
+ * @param address Adresa odkial sa bude citat.
+ * @param data Ukazovatel na buffer, kde sa precitane bajty ulozia.
+ * @param data_size Pocet bajtov co sa budu citat.
+ */
+void
+eeprom_read(uint16_t address, uint8_t * const data, uint16_t data_size)
+{
+	eeprom_check_address_and_size(address, data_size);
+	
+	for (uint16_t i = 0; i < data_size; i++) {
+		eeprom_read_byte(address, &(data[i]));
+		++address;
+	}
+}
+
+/**
+ * @brief Zapis bajtu z EEPROM.
+ *
+ * @param address Adresa kam sa bude zapisovat.
+ * @param byte Bajt pre zapis na adresu @p address.
+ */
+void
+eeprom_write_byte(uint16_t address, uint8_t byte)
+{
+	eeprom_wait_until_ready();
+	EEAR = address;
+	EEDR = byte;
+	EECR |= (1 << EEMWE);
+	EECR |= (1 << EEWE);
+}
+
+/**
+ * @brief Precitanie bajtu z EEPROM.
+ *
+ * @param address Adresa odkial sa bude citat.
+ * @param byte Ukazovatel na bajt, kde bude ulozena precitana hodnota.
+ */
+void
+eeprom_read_byte(uint16_t address, uint8_t *const byte)
+{
+	eeprom_wait_until_ready();
+	EEAR = address;
+	EECR |= (1<<EERE);
+	*byte = EEDR;
+}
+
+/**
+ * @brief Pocka, az bude pamat EEPROM pripravena na dalsiu operaciu.
+ *
+ * Blokujuca funkcia.
+ */
+void
+eeprom_wait_until_ready(void)
+{
+	while ((EECR & (1 << EEWE)) != 0) {
+		;
+	}
+}
+
+/**
+ * @brief Skontroluje ci sa velkost dat @p op_size vojde do EEPROM od adresy @p address.
+ *
+ * Ak sa data nezmestia, vyvola chybu.
+ *
+ * @param address Adresa v EEPROM.
+ * @param op_size Pocet bajtov dat.
+ */
+void
+eeprom_check_address_and_size(uint16_t address, uint16_t op_size)
+{
+	if ((address >= EEPROM_SIZE_IN_BYTES) || ((address + op_size) > EEPROM_SIZE_IN_BYTES)) {
+		error();
+	}	
+}
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