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c0628a3058
add peripheral drivers for Freescale Kinetis MCUs:
adc driver
cpuid driver
gpio driver
hwtimer_arch driver (hwtimer used Low Power Timer)
i2c driver (master mode only)
mcg driver
pwm driver
random_rnga driver
random_rngb driver
rtc driver
spi driver
timer driver (timer used Periodic Interrupt Timer)
uart driver
add doc.txt (configuration examples)
random_rnga: Update RNGA driver in preparation for RNGB driver.
random_rngb: Add RNGB driver.
spi: refactor SPI to work for multiple CTARS, add spi_acquire, spi_release
gpio: Add gpio_irq_enable, gpio_irq_disable. Refactor GPIO.
gpio: Add gpio_irq_enable, gpio_irq_disable.
gpio: Refactor ISR functions to work with all GPIOs (0-31) and all ports (PORTA-PORTH)
adc: Refactor ADC, add calibration and scaling.
Added integer scaling of results in adc_map.
Handle precision setting in adc_init.
Set ADC clock divider depending on module clock.
Add ADC_1 as a possible device.
Add ADC calibration procedure according to K60 ref manual.
Handle ADC pins which are not part of the pin function mux.
Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
83 lines
1.6 KiB
C
83 lines
1.6 KiB
C
/*
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* Copyright (C) 2014 Freie Universität Berlin
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* Copyright (C) 2014 PHYTEC Messtechnik GmbH
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup cpu_kinetis_common_rnga
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*
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* @{
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*
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* @file
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* @brief Low-level random number generator driver implementation.
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*
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* @author Johann Fischer <j.fischer@phytec.de> (adaption for Freescale's RNGA)
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* @author Hauke Petersen <mail@haukepetersen.de>
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*
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* @}
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*/
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#include "cpu.h"
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#include "periph/random.h"
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#include "periph_conf.h"
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#if RANDOM_NUMOF
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#ifdef KINETIS_RNGA
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void random_init(void)
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{
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random_poweron();
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}
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int random_read(char *buf, unsigned int num)
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{
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/* cppcheck-suppress variableScope */
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uint32_t tmp;
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int count = 0;
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/* self-seeding */
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while (!(KINETIS_RNGA->SR & RNG_SR_OREG_LVL_MASK));
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KINETIS_RNGA->ER = KINETIS_RNGA->OR ^ (uint32_t)buf;
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while (count < num) {
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/* wait for random data to be ready to read */
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while (!(KINETIS_RNGA->SR & RNG_SR_OREG_LVL_MASK));
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tmp = KINETIS_RNGA->OR;
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/* copy data into result vector */
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for (int i = 0; i < 4 && count < num; i++) {
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buf[count++] = (char)tmp;
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tmp = tmp >> 8;
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}
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}
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return count;
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}
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void random_poweron(void)
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{
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RANDOM_CLKEN();
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KINETIS_RNGA->CR = RNG_CR_INTM_MASK | RNG_CR_HA_MASK | RNG_CR_GO_MASK;
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}
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void random_poweroff(void)
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{
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KINETIS_RNGA->CR = 0;
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RANDOM_CLKDIS();
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}
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/*
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void isr_rng(void)
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{
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}
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*/
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#endif /* KINETIS_RNGA */
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#endif /* RANDOM_NUMOF */
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