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/* Copyright 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* STM32F072-discovery board configuration */
#include "common.h"
#include "ec_version.h"
#include "gpio.h"
#include "hooks.h"
#include "queue_policies.h"
#include "registers.h"
#include "spi.h"
#include "task.h"
#include "usart-stm32f0.h"
#include "usart_tx_dma.h"
#include "usart_rx_dma.h"
#include "usb_gpio.h"
#include "usb_spi.h"
#include "usb-stream.h"
#include "util.h"
/******************************************************************************
* Build GPIO tables and expose a subset of the GPIOs over USB.
*/
void button_event(enum gpio_signal signal);
#include "gpio_list.h"
static enum gpio_signal const usb_gpio_list[] = {
GPIO_USER_BUTTON,
GPIO_LED_U,
GPIO_LED_D,
GPIO_LED_L,
GPIO_LED_R,
};
/*
* This instantiates struct usb_gpio_config const usb_gpio, plus several other
* variables, all named something beginning with usb_gpio_
*/
USB_GPIO_CONFIG(usb_gpio,
usb_gpio_list,
USB_IFACE_GPIO,
USB_EP_GPIO);
/******************************************************************************
* Setup USART1 as a loopback device, it just echo's back anything sent to it.
*/
static struct usart_config const loopback_usart;
static struct queue const loopback_queue =
QUEUE_DIRECT(64, uint8_t,
loopback_usart.producer,
loopback_usart.consumer);
static struct usart_rx_dma const loopback_rx_dma =
USART_RX_DMA(STM32_DMAC_CH3, 8);
static struct usart_tx_dma const loopback_tx_dma =
USART_TX_DMA(STM32_DMAC_CH2, 16);
static struct usart_config const loopback_usart =
USART_CONFIG(usart1_hw,
loopback_rx_dma.usart_rx,
loopback_tx_dma.usart_tx,
115200,
0,
loopback_queue,
loopback_queue);
/******************************************************************************
* Forward USART4 as a simple USB serial interface.
*/
static struct usart_config const forward_usart;
struct usb_stream_config const forward_usb;
static struct queue const usart_to_usb = QUEUE_DIRECT(64, uint8_t,
forward_usart.producer,
forward_usb.consumer);
static struct queue const usb_to_usart = QUEUE_DIRECT(64, uint8_t,
forward_usb.producer,
forward_usart.consumer);
static struct usart_tx_dma const forward_tx_dma =
USART_TX_DMA(STM32_DMAC_CH7, 16);
static struct usart_config const forward_usart =
USART_CONFIG(usart4_hw,
usart_rx_interrupt,
forward_tx_dma.usart_tx,
115200,
0,
usart_to_usb,
usb_to_usart);
#define USB_STREAM_RX_SIZE 16
#define USB_STREAM_TX_SIZE 16
USB_STREAM_CONFIG(forward_usb,
USB_IFACE_STREAM,
USB_STR_STREAM_NAME,
USB_EP_STREAM,
USB_STREAM_RX_SIZE,
USB_STREAM_TX_SIZE,
usb_to_usart,
usart_to_usb)
/******************************************************************************
* Handle button presses by cycling the LEDs on the board. Also run a tick
* handler to cycle them when they are not actively under USB control.
*/
void button_event(enum gpio_signal signal)
{
static int count;
gpio_set_level(GPIO_LED_U, (count & 0x03) == 0);
gpio_set_level(GPIO_LED_R, (count & 0x03) == 1);
gpio_set_level(GPIO_LED_D, (count & 0x03) == 2);
gpio_set_level(GPIO_LED_L, (count & 0x03) == 3);
count++;
}
void usb_gpio_tick(void)
{
if (usb_gpio.state->set_mask || usb_gpio.state->clear_mask)
return;
button_event(0);
}
DECLARE_HOOK(HOOK_TICK, usb_gpio_tick, HOOK_PRIO_DEFAULT);
/******************************************************************************
* Define the strings used in our USB descriptors.
*/
const void *const usb_strings[] = {
[USB_STR_DESC] = usb_string_desc,
[USB_STR_VENDOR] = USB_STRING_DESC("Google Inc."),
[USB_STR_PRODUCT] = USB_STRING_DESC("discovery-stm32f072"),
[USB_STR_VERSION] = USB_STRING_DESC(CROS_EC_VERSION32),
[USB_STR_STREAM_NAME] = USB_STRING_DESC("Forward"),
[USB_STR_CONSOLE_NAME] = USB_STRING_DESC("Shell"),
[USB_STR_SPI_NAME] = USB_STRING_DESC("SPI"),
};
BUILD_ASSERT(ARRAY_SIZE(usb_strings) == USB_STR_COUNT);
/******************************************************************************
* Support SPI bridging over USB, this requires usb_spi_board_enable and
* usb_spi_board_disable to be defined to enable and disable the SPI bridge.
*/
/* SPI devices */
const struct spi_device_t spi_devices[] = {
{ CONFIG_SPI_FLASH_PORT, 0, GPIO_SPI_CS},
};
const unsigned int spi_devices_used = ARRAY_SIZE(spi_devices);
void usb_spi_board_enable(struct usb_spi_config const *config)
{
/* Remap SPI2 to DMA channels 6 and 7 */
STM32_SYSCFG_CFGR1 |= BIT(24);
/* Configure SPI GPIOs */
gpio_config_module(MODULE_SPI_FLASH, 1);
/* Set all four SPI pins to high speed */
STM32_GPIO_OSPEEDR(GPIO_B) |= 0xff000000;
/* Enable clocks to SPI2 module */
STM32_RCC_APB1ENR |= STM32_RCC_PB1_SPI2;
/* Reset SPI2 */
STM32_RCC_APB1RSTR |= STM32_RCC_PB1_SPI2;
STM32_RCC_APB1RSTR &= ~STM32_RCC_PB1_SPI2;
spi_enable(&spi_devices[0], 1);
}
void usb_spi_board_disable(struct usb_spi_config const *config)
{
spi_enable(&spi_devices[0], 0);
/* Disable clocks to SPI2 module */
STM32_RCC_APB1ENR &= ~STM32_RCC_PB1_SPI2;
/* Release SPI GPIOs */
gpio_config_module(MODULE_SPI_FLASH, 0);
}
USB_SPI_CONFIG(usb_spi, USB_IFACE_SPI, USB_EP_SPI, 0);
/******************************************************************************
* Initialize board.
*/
static void board_init(void)
{
gpio_enable_interrupt(GPIO_USER_BUTTON);
queue_init(&loopback_queue);
queue_init(&usart_to_usb);
queue_init(&usb_to_usart);
usart_init(&loopback_usart);
usart_init(&forward_usart);
usb_spi_enable(&usb_spi, 1);
}
DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
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