/* * This file is part of the libopencm3 project. * * Copyright (C) 2010 Uwe Hermann * Copyright (C) 2012 Michael Ossmann * * 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 . */ #include #include #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; }