/* * This file is part of the libopencm3 project. * * Copyright (C) 2012 Benjamin Vernoux * * 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 #include #include "../jellybean_conf.h" void gpio_setup(void) { /* 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 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 SSP1 Peripheral (to be moved later in SSP driver) */ scu_pinmux(SCU_SSP1_MISO, (SCU_SSP_IO | SCU_CONF_FUNCTION5)); scu_pinmux(SCU_SSP1_MOSI, (SCU_SSP_IO | SCU_CONF_FUNCTION5)); scu_pinmux(SCU_SSP1_SCK, (SCU_SSP_IO | SCU_CONF_FUNCTION1)); scu_pinmux(SCU_SSP1_SSEL, (SCU_SSP_IO | SCU_CONF_FUNCTION1)); /* 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. */ } int main(void) { int i; u8 ssp_val; u8 serial_clock_rate; u8 clock_prescale_rate; gpio_setup(); /* Freq About 1.12MHz => Freq = PCLK / (CPSDVSR * [SCR+1]) with PCLK=PLL1=288MHz */ clock_prescale_rate = 2; serial_clock_rate = 128; ssp_init(SSP1_NUM, SSP_DATA_8BITS, SSP_FRAME_SPI, SSP_CPOL_0_CPHA_0, serial_clock_rate, clock_prescale_rate, SSP_MODE_NORMAL, SSP_MASTER, SSP_SLAVE_OUT_ENABLE); ssp_val = 0x0; while (1) { ssp_write(SSP1_NUM, (u16)ssp_val); gpio_set(GPIO2, GPIOPIN1); /* LED on */ for (i = 0; i < 1000; i++) /* Wait a bit. */ __asm__("nop"); gpio_clear(GPIO2, GPIOPIN1); /* LED off */ ssp_val++; } return 0; }