103 lines
2.7 KiB
C
103 lines
2.7 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 Benjamin Vernoux <titanmkd@gmail.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/lpc43xx/gpio.h>
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#include <libopencm3/lpc43xx/scu.h>
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#include <libopencm3/lpc43xx/cgu.h>
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#include <libopencm3/lpc43xx/ssp.h>
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#include "../jellybean_conf.h"
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void gpio_setup(void)
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{
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/* Configure all GPIO as Input (safe state) */
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GPIO0_DIR = 0;
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GPIO1_DIR = 0;
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GPIO2_DIR = 0;
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GPIO3_DIR = 0;
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GPIO4_DIR = 0;
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GPIO5_DIR = 0;
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GPIO6_DIR = 0;
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GPIO7_DIR = 0;
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/* Configure SCU Pin Mux as GPIO */
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scu_pinmux(SCU_PINMUX_LED1, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_LED2, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_LED3, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_EN1V8, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT0, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT1, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT2, SCU_GPIO_FAST);
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scu_pinmux(SCU_PINMUX_BOOT3, SCU_GPIO_FAST);
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/* Configure SSP1 Peripheral (to be moved later in SSP driver) */
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scu_pinmux(SCU_SSP1_MISO, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
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scu_pinmux(SCU_SSP1_MOSI, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
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scu_pinmux(SCU_SSP1_SCK, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
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scu_pinmux(SCU_SSP1_SSEL, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
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/* Configure GPIO as Output */
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GPIO2_DIR |= (PIN_LED1|PIN_LED2|PIN_LED3); /* Configure GPIO2[1/2/8] (P4_1/2 P6_12) as output. */
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GPIO3_DIR |= PIN_EN1V8; /* GPIO3[6] on P6_10 as output. */
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}
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int main(void)
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{
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int i;
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u8 ssp_val;
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u8 serial_clock_rate;
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u8 clock_prescale_rate;
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gpio_setup();
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/* Freq About 1.12MHz => Freq = PCLK / (CPSDVSR * [SCR+1]) with PCLK=PLL1=288MHz */
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clock_prescale_rate = 2;
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serial_clock_rate = 128;
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ssp_init(SSP1_NUM,
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SSP_DATA_8BITS,
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SSP_FRAME_SPI,
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SSP_CPOL_0_CPHA_0,
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serial_clock_rate,
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clock_prescale_rate,
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SSP_MODE_NORMAL,
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SSP_MASTER,
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SSP_SLAVE_OUT_ENABLE);
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ssp_val = 0x0;
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while (1) {
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ssp_write(SSP1_NUM, (u16)ssp_val);
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gpio_set(GPIO2, GPIOPIN1); /* LED on */
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for (i = 0; i < 1000; i++) /* Wait a bit. */
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__asm__("nop");
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gpio_clear(GPIO2, GPIOPIN1); /* LED off */
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ssp_val++;
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}
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return 0;
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}
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