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