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/*
* Copyright (C) 2017 Karl Palsson <karlp@tweak.net.au>
*/
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/crs.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/i2c.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/usart.h>
#include <stdio.h>
#include "hw.h"
#include "i2c-master.h"
#define LED_DISCO_GREEN_PORT GPIOC
#define LED_DISCO_GREEN_PIN GPIO9
struct hw_detail hw_details = {
.periph = I2C1,
.periph_rcc = RCC_I2C1,
.periph_rst = RST_I2C1,
.pins = GPIO8 | GPIO9, /* our external i2c device on I2c1 */
.port = GPIOB,
.port_rcc = RCC_GPIOB,
.trigger_rcc = RCC_GPIOB,
.trigger_port = GPIOB,
.trigger_pin = GPIO12,
.i2c_clock_megahz = 48,
};
static
void setup_usart(void)
{
uint32_t dev = USART1;
rcc_periph_clock_enable(RCC_USART1);
rcc_periph_clock_enable(RCC_GPIOA);
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
gpio_set_af(GPIOA, GPIO_AF1, GPIO9);
usart_set_baudrate(dev, 115200);
usart_set_databits(dev, 8);
usart_set_parity(dev, USART_PARITY_NONE);
usart_set_stopbits(dev, USART_CR2_STOPBITS_1);
usart_set_mode(dev, USART_MODE_TX);
usart_set_flow_control(dev, USART_FLOWCONTROL_NONE);
/* Finally enable the USART. */
usart_enable(dev);
}
/**
* Setup any gpios or anything hardware specific.
* Should _only_ be things that can't be done in shared i2cm_init!
*/
static void i2cm_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);
/* i2c 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_OD, GPIO_OSPEED_HIGH, hw_details.pins);
gpio_set_af(hw_details.port, GPIO_AF1, hw_details.pins);
/* select sysclk as i2c clock! */
RCC_CFGR3 |= RCC_CFGR3_I2C1SW;
}
static void setup(void)
{
setup_usart();
printf("hi guys!\n");
i2cm_hw_init();
i2cm_init();
}
int main(void)
{
int i;
rcc_clock_setup_in_hsi48_out_48mhz();
/* green led for ticking */
rcc_periph_clock_enable(RCC_GPIOC);
gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, LED_DISCO_GREEN_PIN);
gpio_set(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
setup();
while (1) {
i2cm_task();
gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
for (i = 0; i < 0x800000; i++) { /* Wait a bit. */
__asm__("NOP");
}
}
}
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