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Diffstat (limited to 'examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c')
-rw-r--r--examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c b/examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c
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+++ b/examples/lpc43xx/hackrf-jellybean/i2c/i2cdemo.c
@@ -0,0 +1,106 @@
+/*
+ * 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/i2c.h>
+
+#include "../jellybean_conf.h"
+
+void gpio_setup(void)
+{
+ /* Configure SCU Pin Mux as GPIO */
+ scu_pinmux(SCU_PINMUX_LED1, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_LED2, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_LED3, SCU_GPIO_FAST);
+
+ scu_pinmux(SCU_PINMUX_EN1V8, SCU_GPIO_FAST);
+
+ scu_pinmux(SCU_PINMUX_BOOT0, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT1, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT2, SCU_GPIO_FAST);
+ scu_pinmux(SCU_PINMUX_BOOT3, SCU_GPIO_FAST);
+
+ /* Configure all GPIO as Input (safe state) */
+ GPIO0_DIR = 0;
+ GPIO1_DIR = 0;
+ GPIO2_DIR = 0;
+ GPIO3_DIR = 0;
+ GPIO4_DIR = 0;
+ GPIO5_DIR = 0;
+ GPIO6_DIR = 0;
+ GPIO7_DIR = 0;
+
+ /* Configure GPIO as Output */
+ GPIO2_DIR |= (PIN_LED1|PIN_LED2|PIN_LED3); /* Configure GPIO2[1/2/8] (P4_1/2 P6_12) as output. */
+ GPIO3_DIR |= PIN_EN1V8; /* GPIO3[6] on P6_10 as output. */
+}
+
+#define SI5351C_I2C_ADDR (0x60 << 1)
+
+/* write to single register */
+void si5351c_write_reg(uint8_t reg, uint8_t val)
+{
+ i2c0_tx_start();
+ i2c0_tx_byte(SI5351C_I2C_ADDR | I2C_WRITE);
+ i2c0_tx_byte(reg);
+ i2c0_tx_byte(val);
+ i2c0_stop();
+}
+
+/* read single register */
+uint8_t si5351c_read_reg(uint8_t reg)
+{
+ uint8_t val;
+
+ /* set register address with write */
+ i2c0_tx_start();
+ i2c0_tx_byte(SI5351C_I2C_ADDR | I2C_WRITE);
+ i2c0_tx_byte(reg);
+
+ /* read the value */
+ i2c0_tx_start();
+ i2c0_tx_byte(SI5351C_I2C_ADDR | I2C_READ);
+ val = i2c0_rx_byte();
+ i2c0_stop();
+
+ return val;
+}
+
+int main(void)
+{
+ int i;
+
+ gpio_setup();
+ i2c0_init();
+
+ gpio_set(PORT_EN1V8, PIN_EN1V8); /* 1V8 on */
+
+ while (1) {
+ if (si5351c_read_reg(0) == 0x10)
+ gpio_set(GPIO2, GPIOPIN1); /* LED on */
+ else
+ gpio_clear(GPIO2, GPIOPIN1); /* LED off */
+
+ for (i = 0; i < 1000; i++) /* Wait a bit. */
+ __asm__("nop");
+ }
+
+ return 0;
+}