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main.c
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main.c
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/* -*- mode: c; tab-width: 8 -*-
* SPDX-License-Identifier: MIT
* Copyright (C) 2021-2022 Sergey Bolshakov <beefdeadbeef@gmail.com>
*/
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/cm3/systick.h>
#include <libopencm3/stm32/crs.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/rcc.h>
#include "common.h"
const struct rcc_clock_scale rcc_hse_custom[] = {
{ /* 61=>47656.25 */
.hse_xtpre = RCC_CFGR_PLLXTPRE_HSE_CLK_PREDIV,
.pll_mul = RCC_CFGR_PLLRANGE_HIGH | RCC_CFGR_PLLMUL_PLL_CLK_MUL61,
.pll_source = RCC_CFGR_PLLSRC_HSE_CLK,
.hpre = RCC_CFGR_HPRE_NODIV,
.ppre1 = RCC_CFGR_PPRE_DIV2,
.ppre2 = RCC_CFGR_PPRE_DIV2,
.ahb_frequency = 244000000,
.apb1_frequency = 122000000,
.apb2_frequency = 122000000
},
{ /* 56=>43750 57=>44531.25 */
.hse_xtpre = RCC_CFGR_PLLXTPRE_HSE_CLK_PREDIV,
.pll_mul = RCC_CFGR_PLLRANGE_HIGH | RCC_CFGR_PLLMUL_PLL_CLK_MUL56,
.pll_source = RCC_CFGR_PLLSRC_HSE_CLK,
.hpre = RCC_CFGR_HPRE_NODIV,
.ppre1 = RCC_CFGR_PPRE_DIV2,
.ppre2 = RCC_CFGR_PPRE_DIV2,
.ahb_frequency = 224000000,
.apb1_frequency = 112000000,
.apb2_frequency = 112000000
}
};
static const struct rcc_clock_scale *clock = rcc_hse_custom;
volatile uint32_t systicks;
volatile ev_t e = {
.seen = true,
.state = STATE_CLOSED
};
volatile cs_t cstate = {
.on[muted] = true,
.on[spmuted] = true,
.attn = 6,
.rate = SAMPLE_RATE_48000
};
void disp();
void pump(page_t);
void pwm();
void pwm_enable();
void usbd(void);
void sys_tick_handler(void)
{
systicks++;
}
void pll_setup(sample_rate rate)
{
const struct rcc_clock_scale *clk;
debugf("rate=%d\n", rate);
switch (rate) {
case SAMPLE_RATE_44100:
case SAMPLE_RATE_88200:
clk = &rcc_hse_custom[1];
break;
default:
clk = rcc_hse_custom;
}
if (clk == clock) return;
rcc_set_sysclk_source(RCC_CFGR_SW_SYSCLKSEL_HSICLK);
rcc_osc_off(RCC_PLL);
while(rcc_is_osc_ready(RCC_PLL));
rcc_clock_setup_pll(clk);
clock = clk;
}
static void poll()
{
gpio_toggle(GPIOC, GPIO13);
}
int main() {
uint32_t wake;
/*
* clocks
*/
rcc_clock_setup_pll(clock);
rcc_periph_clock_enable(RCC_AFIO);
rcc_periph_clock_enable(RCC_CRS);
rcc_periph_clock_enable(RCC_DMA1);
rcc_periph_clock_enable(RCC_DMA2);
rcc_periph_clock_enable(RCC_GPIOA);
rcc_periph_clock_enable(RCC_GPIOB);
rcc_periph_clock_enable(RCC_GPIOC);
rcc_periph_clock_enable(RCC_SPI4);
rcc_periph_clock_enable(RCC_TIM1);
rcc_periph_clock_enable(RCC_TIM2);
rcc_periph_clock_enable(RCC_TIM3);
rcc_periph_clock_enable(RCC_TIM4);
rcc_set_hsi_div(RCC_CFGR3_HSIDIV_NODIV);
rcc_set_hsi_sclk(RCC_CFGR5_HSI_SCLK_HSIDIV);
rcc_set_usb_clock_source(RCC_HSI);
rcc_periph_clock_enable(RCC_USB);
rcc_usb_alt_pma_enable();
rcc_usb_alt_isr_enable();
crs_autotrim_usb_enable();
/*
* systick
*/
systick_set_clocksource(STK_CSR_CLKSOURCE_AHB);
systick_set_reload(rcc_ahb_frequency / 1000);
systick_interrupt_enable();
systick_counter_enable();
/*
* gpios
*/
gpio_set_mux(AFIO_GMUX_SWJ_NO_JTAG);
gpio_set_mux(AFIO_GMUX_TIM3_B4);
gpio_set_mux(AFIO_GMUX_SPI4_B6);
gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
GPIO_CNF_INPUT_PULL_UPDOWN,
GPIO0|GPIO1| /* TIM2 CH[1:2] */
GPIO2); /* ENC_SW */
gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
GPIO_CNF_INPUT_FLOAT,
GPIO3); /* JSENSE */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
GPIO8|GPIO9|GPIO10| /* TIM1 CH[1:3] */
GPIO11|GPIO12); /* USBFS */
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_10_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL,
GPIO15); /* PWMEN1 */
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_10_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL,
GPIO6| /* DISP_RST */
GPIO8| /* DISP_DC */
GPIO12); /* PWMEN */
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
GPIO4|GPIO5| /* TIM3 CH[1:2] */
GPIO7| /* SPI4 CLK */
GPIO9| /* SPI4 MOSI */
GPIO13|GPIO14|GPIO15); /* TIM1 CH[1:3]N */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL,
GPIO13); /* PC13 LED */
gpio_set(GPIOA, GPIO0|GPIO1|GPIO2|GPIO3|GPIO15);
gpio_set(GPIOB, GPIO6|GPIO8|GPIO12);
cstate.on[spmuted] = (gpio_get(GPIOA, GPIO3) != 0);
cstate.on[boost] = !cstate.on[spmuted];
/*
*
*/
disp();
pwm();
usbd();
mainloop:
wake = systicks + 500;
sleep:
__asm("wfe");
if (e.seen) goto poll;
e.seen = true;
switch (e.state) {
case STATE_FILL:
pump(BUSY_PAGE);
pump(FREE_PAGE);
e.state = STATE_RUNNING;
pwm_enable();
break;
case STATE_RUNNING:
pump(FREE_PAGE);
break;
case STATE_DRAIN:
e.state = STATE_CLOSED;
case STATE_CLOSED:
break;
};
poll:
if (wake > systicks)
goto sleep;
poll();
goto mainloop;
return 0;
}