From c68bf6a3244ec3fc31415621b25ff5e77726783f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?King=20K=C3=A9vin?= <kingkevin@cuvoodoo.info>
Date: Tue, 17 Aug 2021 08:54:17 +0200
Subject: [PATCH] =?UTF-8?q?main:=20fix,=20write=20I=C2=B2C=20EEPROM=20in?=
 =?UTF-8?q?=20pages?=
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---
 main.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/main.c b/main.c
index 8f3d154..f6005e7 100644
--- a/main.c
+++ b/main.c
@@ -173,6 +173,9 @@ static bool save_edid(void)
 	return ram_eeprom_blockprog(edid, edid_length());
 }
 
+// size in byte of a page in the I²C EEPROM (for faster page write)
+#define I2C_EEPROM_PAGE_SIZE 16U
+
 // read EDID from I²C memory
 // return if succeeded
 static bool read_edid(void)
@@ -192,12 +195,25 @@ static bool read_edid(void)
 // return if succeeded
 static bool write_edid(void)
 {
-	const uint8_t address[] = {0};
-	if (!i2c_master_setup(false)) {
+	if (!i2c_master_setup(5)) {
+		puts("I²C setup failed");
 		return false;
 	}
-	if (I2C_MASTER_RC_NONE != i2c_master_address_write(I2C_SLAVE, false, address, ARRAY_LENGTH(address), edid, edid_length())) {
-		return false;
+	// write all page
+	const uint16_t length = edid_length();
+	for (uint16_t i = 0; i < length; i += I2C_EEPROM_PAGE_SIZE) {
+		const uint8_t address[] = {i};
+		const enum i2c_master_rc rc = i2c_master_address_write(I2C_SLAVE, false, address, ARRAY_LENGTH(address), &edid[i], I2C_EEPROM_PAGE_SIZE); // write I²C EEPROM page
+		if (I2C_MASTER_RC_NONE != rc) {
+			puts("I²C write failed (");
+			putc('0' + rc);
+			putc(')');
+			if (I2C_MASTER_RC_BUS_ERROR == rc) {
+				i2c_master_reset(); // try to clear any I²C issue
+			}
+			return false;
+		}
+		wait_10us((5 + 1) * 100); // wait 5 ms for the page write to complete
 	}
 	i2c_master_release(); // release I²C again
 	return true;