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/*
* March 2017 Karl Palsson <karlp@tweak.net.au>
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/spi.h>
#include <libopencm3/stm32/rcc.h>
#include "trace.h"
#include "hw.h"
#define LED_DISCO_GREEN_PORT GPIOB
#define LED_DISCO_GREEN_PIN GPIO8
struct hw_detail hw_details = {
.periph = SPI2,
.periph_rcc = RCC_SPI2,
.periph_rst = RST_SPI2,
.pins = GPIO13| GPIO14 | GPIO15, /* SPI pins for setting AF with */
.port = GPIOB,
.port_rcc = RCC_GPIOB,
.trigger_rcc = RCC_GPIOB,
.trigger_port = GPIOB,
.trigger_pin = GPIO9,
};
/* provided in board files please*/
/**
* Setup any gpios or anything hardware specific.
* Should _only_ be things that can't be done in shared init()
*/
static void hw_init(void)
{
/* trigger pin gpio */
rcc_periph_clock_enable(hw_details.trigger_rcc);
gpio_mode_setup(hw_details.trigger_port, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, hw_details.trigger_pin);
/* spi control lines */
rcc_periph_clock_enable(hw_details.port_rcc);
gpio_mode_setup(hw_details.port, GPIO_MODE_AF, GPIO_PUPD_NONE, hw_details.pins);
gpio_set_output_options(hw_details.port, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, hw_details.pins);
gpio_set_af(hw_details.port, GPIO_AF5, hw_details.pins);
}
static void test_init(void)
{
/* Setup SPI parameters. */
rcc_periph_clock_enable(hw_details.periph_rcc);
spi_init_master(hw_details.periph, SPI_CR1_BAUDRATE_FPCLK_DIV_16, SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE,
SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
/* Ignore the stupid NSS pin. */
spi_enable_software_slave_management(hw_details.periph);
//spi_enable_ss_output(MRF_SPI);
spi_set_nss_high(hw_details.periph);
/* Finally enable the SPI. */
spi_enable(hw_details.periph);
}
static void test_task(void) {
static int i = 0;
printf("Test iteration %d\n", i++);
gpio_set(hw_details.trigger_port, hw_details.trigger_pin);
spi_xfer(hw_details.periph, 0xaa);
spi_xfer(hw_details.periph, 0x42);
spi_xfer(hw_details.periph, 0x69);
gpio_clear(hw_details.trigger_port, hw_details.trigger_pin);
}
static void setup(void)
{
printf("hi guys!\n");
hw_init();
test_init();
}
int main(void)
{
const struct rcc_clock_scale myclock = {
.pll_source = RCC_CFGR_PLLSRC_HSE_CLK,
.pll_mul = RCC_CFGR_PLLMUL_MUL4,
.pll_div = RCC_CFGR_PLLDIV_DIV2,
.hpre = RCC_CFGR_HPRE_SYSCLK_NODIV,
.ppre1 = RCC_CFGR_PPRE1_HCLK_NODIV,
.ppre2 = RCC_CFGR_PPRE2_HCLK_NODIV,
.voltage_scale = PWR_SCALE1,
.flash_waitstates = 1,
.ahb_frequency = 32e6,
.apb1_frequency = 32e6,
.apb2_frequency = 32e6,
};
int i, j;
rcc_clock_setup_pll(&myclock);
/* green led for ticking */
rcc_periph_clock_enable(RCC_GPIOB);
gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
LED_DISCO_GREEN_PIN);
setup();
while (1) {
test_task();
gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
for (i = 0; i < 0x800000; i++) { /* Wait a bit. */
__asm__("NOP");
}
}
return 0;
}
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