From e1d63a1ac2acbc22ff39f05b0f4d3d58a819cf34 Mon Sep 17 00:00:00 2001
From: Erik Kooistra <kooistra@astron.nl>
Date: Fri, 16 Oct 2015 13:17:16 +0000
Subject: [PATCH] Added func_i2c_calculate_clk_cnt with bit_rate_in_kHz
argument.
---
libraries/io/i2c/src/vhdl/i2c_pkg.vhd | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/libraries/io/i2c/src/vhdl/i2c_pkg.vhd b/libraries/io/i2c/src/vhdl/i2c_pkg.vhd
index 55c846fa66..556ea2a630 100644
--- a/libraries/io/i2c/src/vhdl/i2c_pkg.vhd
+++ b/libraries/io/i2c/src/vhdl/i2c_pkg.vhd
@@ -56,6 +56,7 @@ PACKAGE i2c_pkg IS
CONSTANT c_i2c_phy_sim : t_c_i2c_phy := (1, c_i2c_comma_w_dis);
-- Calculate clk_cnt from system_clock_freq_in_MHz
+ FUNCTION func_i2c_calculate_clk_cnt(system_clock_freq_in_MHz, bit_rate_in_kHz : NATURAL) RETURN NATURAL;
FUNCTION func_i2c_calculate_clk_cnt(system_clock_freq_in_MHz : NATURAL) RETURN NATURAL;
-- Calculate (clk_cnt, comma_w) from system_clock_freq_in_MHz
@@ -70,6 +71,14 @@ END i2c_pkg;
PACKAGE BODY i2c_pkg IS
+ FUNCTION func_i2c_calculate_clk_cnt(system_clock_freq_in_MHz, bit_rate_in_kHz : NATURAL) RETURN NATURAL IS
+ -- . Adapt c_i2c_clk_freq and c_i2c_bit_rate and c_i2c_clk_cnt will be set appropriately
+ -- . Default no comma time is needed, it appeared necessary for the uP based I2C slave in the LOFAR HBA client
+ CONSTANT c_clk_cnt_factor : NATURAL := 5;
+ BEGIN
+ RETURN system_clock_freq_in_MHz * 1000 / bit_rate_in_kHz / c_clk_cnt_factor - 1;
+ END;
+
FUNCTION func_i2c_calculate_clk_cnt(system_clock_freq_in_MHz : NATURAL) RETURN NATURAL IS
-- . Adapt c_i2c_clk_freq and c_i2c_bit_rate and c_i2c_clk_cnt will be set appropriately
-- . Default no comma time is needed, it appeared necessary for the uP based I2C slave in the LOFAR HBA client
--
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