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authorMichael Ossmann2012-05-30 10:08:04 -0600
committerMichael Ossmann2012-05-30 10:08:04 -0600
commit10e71edb82943da81b22473df069c4b0df9c9027 (patch)
tree5a30e565e49847d916cf64c4a891c5e2c91f4a8c /examples/lpc43xx
parent5339d06e9cbdd4ba9a5a2e9f6c36b7cced773eba (diff)
started i2c example, still incomplete and much will be moved to drivers/headers elsewhere
Diffstat (limited to 'examples/lpc43xx')
-rw-r--r--examples/lpc43xx/hackrf-jellybean/i2c/Makefile24
-rw-r--r--examples/lpc43xx/hackrf-jellybean/i2c/README5
-rw-r--r--examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c102
3 files changed, 131 insertions, 0 deletions
diff --git a/examples/lpc43xx/hackrf-jellybean/i2c/Makefile b/examples/lpc43xx/hackrf-jellybean/i2c/Makefile
new file mode 100644
index 0000000..b18f122
--- /dev/null
+++ b/examples/lpc43xx/hackrf-jellybean/i2c/Makefile
@@ -0,0 +1,24 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library. If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = i2cdemo
+
+LDSCRIPT = ../jellybean-lpc4330.ld
+
+include ../../Makefile.include
diff --git a/examples/lpc43xx/hackrf-jellybean/i2c/README b/examples/lpc43xx/hackrf-jellybean/i2c/README
new file mode 100644
index 0000000..0785a11
--- /dev/null
+++ b/examples/lpc43xx/hackrf-jellybean/i2c/README
@@ -0,0 +1,5 @@
+------------------------------------------------------------------------------
+README
+------------------------------------------------------------------------------
+
+This program exercises the I2C peripheral on Jellybean's LPC43xx.
diff --git a/examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c b/examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c
new file mode 100644
index 0000000..d6441ab
--- /dev/null
+++ b/examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c
@@ -0,0 +1,102 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2012 Michael Ossmann <mike@ossmann.com>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/lpc43xx/gpio.h>
+#include <libopencm3/lpc43xx/scu.h>
+#include <libopencm3/lpc43xx/cgu.h>
+#include <libopencm3/lpc43xx/i2c.h>
+
+//FIXME generalize and move to drivers
+
+#define SCU_SFSI2C0_SCL_EFP (1 << 1) /* 3 ns glitch filter */
+#define SCU_SFSI2C0_SCL_EHD (1 << 2) /* Fast-mode Plus transmit */
+#define SCU_SFSI2C0_SCL_EZI (1 << 3) /* Enable the input receiver */
+#define SCU_SFSI2C0_SCL_ZIF (1 << 7) /* Disable input glitch filter */
+#define SCU_SFSI2C0_SDA_EFP (1 << 8) /* 3 ns glitch filter */
+#define SCU_SFSI2C0_SDA_EHD (1 << 10) /* Fast-mode Plus transmit */
+#define SCU_SFSI2C0_SDA_EZI (1 << 11) /* Enable the input receiver */
+#define SCU_SFSI2C0_SDA_ZIF (1 << 15) /* Disable input glitch filter */
+
+#define I2C_CONCLR_AAC (1 << 2) /* Assert acknowledge Clear */
+#define I2C_CONCLR_SIC (1 << 3) /* I2C interrupt Clear */
+#define I2C_CONCLR_STAC (1 << 5) /* START flag Clear */
+#define I2C_CONCLR_I2ENC (1 << 6) /* I2C interface Disable bit */
+
+#define I2C_CONSET_AA (1 << 2) /* Assert acknowledge flag */
+#define I2C_CONSET_SI (1 << 3) /* I2C interrupt flag */
+#define I2C_CONSET_STO (1 << 4) /* STOP flag */
+#define I2C_CONSET_STA (1 << 5) /* START flag */
+#define I2C_CONSET_I2EN (1 << 6) /* I2C interface enable */
+
+#define CGU_SRC_32K 0x00
+#define CGU_SRC_IRC 0x01
+#define CGU_SRC_ENET_RX 0x02
+#define CGU_SRC_ENET_TX 0x03
+#define CGU_SRC_GP_CLKIN 0x04
+#define CGU_SRC_XTAL 0x06
+#define CGU_SRC_PLL0USB 0x07
+#define CGU_SRC_PLL0AUDIO 0x08
+#define CGU_SRC_PLL1 0x09
+#define CGU_SRC_IDIVA 0x0C
+#define CGU_SRC_IDIVB 0x0D
+#define CGU_SRC_IDIVC 0x0E
+#define CGU_SRC_IDIVD 0x0F
+#define CGU_SRC_IDIVE 0x10
+
+#define CGU_BASE_CLK_PD (1 << 0) /* output stage power-down */
+#define CGU_BASE_CLK_AUTOBLOCK (1 << 11) /* block clock automatically */
+#define CGU_BASE_CLK_SEL_SHIFT 24 /* clock source selection (5 bits) */
+
+void i2c0_init()
+{
+ /* enable input on SCL and SDA pins */
+ SCU_SFSI2C0 = (SCU_SFSI2C0_SCL_EZI | SCU_SFSI2C0_SDA_EZI);
+
+ /* use PLL1 as clock source for APB1 (including I2C0) */
+ CGU_BASE_APB1_CLK = (CGU_SRC_PLL1 << CGU_BASE_CLK_SEL_SHIFT);
+
+ //FIXME assuming we're on IRC at 96 MHz
+
+ /* 400 kHz I2C */
+ I2C0_SCLH = 120;
+ I2C0_SCLL = 120;
+
+ /* 100 kHz I2C */
+ //I2C0_SCLH = 480;
+ //I2C0_SCLL = 480;
+
+ /* clear the control bits */
+ I2C0_CONCLR = (I2C_CONCLR_AAC | I2C_CONCLR_SIC
+ | I2C_CONCLR_STAC | I2C_CONCLR_I2ENC);
+
+ /* enable I2C0 */
+ I2C0_CONSET = I2C_CONSET_I2EN;
+}
+
+int main(void)
+{
+ int i;
+
+ i2c0_init();
+
+ //TODO I2C tx/rx
+
+ return 0;
+}