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path: root/drivers/eeprom/eeprom_i2c.c
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Diffstat (limited to 'drivers/eeprom/eeprom_i2c.c')
-rw-r--r--drivers/eeprom/eeprom_i2c.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/eeprom/eeprom_i2c.c b/drivers/eeprom/eeprom_i2c.c
index 4210f06f9f..8e80ff544f 100644
--- a/drivers/eeprom/eeprom_i2c.c
+++ b/drivers/eeprom/eeprom_i2c.c
@@ -16,6 +16,9 @@
#include <stdint.h>
#include <string.h>
+#if defined(EXTERNAL_EEPROM_WP_PIN)
+# include "gpio.h"
+#endif
/*
Note that the implementations of eeprom_XXXX_YYYY on AVR are normally
@@ -50,7 +53,14 @@ static inline void fill_target_address(uint8_t *buffer, const void *addr) {
}
}
-void eeprom_driver_init(void) { i2c_init(); }
+void eeprom_driver_init(void) {
+ i2c_init();
+#if defined(EXTERNAL_EEPROM_WP_PIN)
+ /* We are setting the WP pin to high in a way that requires at least two bit-flips to change back to 0 */
+ writePin(EXTERNAL_EEPROM_WP_PIN, 1);
+ setPinInputHigh(EXTERNAL_EEPROM_WP_PIN);
+#endif
+}
void eeprom_driver_erase(void) {
#if defined(CONSOLE_ENABLE) && defined(DEBUG_EEPROM_OUTPUT)
@@ -89,6 +99,11 @@ void eeprom_write_block(const void *buf, void *addr, size_t len) {
uint8_t * read_buf = (uint8_t *)buf;
uintptr_t target_addr = (uintptr_t)addr;
+#if defined(EXTERNAL_EEPROM_WP_PIN)
+ setPinOutput(EXTERNAL_EEPROM_WP_PIN);
+ writePin(EXTERNAL_EEPROM_WP_PIN, 0);
+#endif
+
while (len > 0) {
uintptr_t page_offset = target_addr % EXTERNAL_EEPROM_PAGE_SIZE;
int write_length = EXTERNAL_EEPROM_PAGE_SIZE - page_offset;
@@ -116,4 +131,10 @@ void eeprom_write_block(const void *buf, void *addr, size_t len) {
target_addr += write_length;
len -= write_length;
}
+
+#if defined(EXTERNAL_EEPROM_WP_PIN)
+ /* We are setting the WP pin to high in a way that requires at least two bit-flips to change back to 0 */
+ writePin(EXTERNAL_EEPROM_WP_PIN, 1);
+ setPinInputHigh(EXTERNAL_EEPROM_WP_PIN);
+#endif
}