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Lisa-M HID example uses accelerometer to move mouse.

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This commit is contained in:
Gareth McMullin 2011-10-31 23:04:36 +13:00 committed by Piotr Esden-Tempski
parent 990109ef47
commit 97fa5ff815
2 changed files with 115 additions and 8 deletions
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38
examples/stm32/f1/lisa-m/usb_hid/adxl345.h Normal file
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@ -0,0 +1,38 @@
/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ADXL345_H
#define __ADXL345_H
/* Register addresses */
#define ADXL345_DEVID 0x00
#define ADXL345_POWER_CTL 0x2D
#define ADXL345_DATA_FORMAT 0x31
#define ADXL345_DATAX0 0x32
#define ADXL345_DATAX1 0x33
#define ADXL345_DATAY0 0x34
#define ADXL345_DATAY1 0x35
#define ADXL345_DATAZ0 0x36
#define ADXL345_DATAZ1 0x37
#define ADXL345_POWER_CTL_MEASURE (1 << 3)
#define ADXL345_DATA_FORMAT_LALIGN (1 << 2)
#endif

85
examples/stm32/f1/lisa-m/usb_hid/usbhid.c
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@ -22,10 +22,13 @@
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/stm32/systick.h>
#include <libopencm3/stm32/spi.h>
#include <libopencm3/stm32/otg_fs.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/hid.h>
#include "adxl345.h"
/* Define this to include the DFU APP interface. */
#define INCLUDE_DFU_INTERFACE
@ -91,7 +94,7 @@ const struct usb_endpoint_descriptor hid_endpoint = {
.bEndpointAddress = 0x81,
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
.wMaxPacketSize = 4,
.bInterval = 0x20,
.bInterval = 0x02,
};
const struct usb_interface_descriptor hid_iface = {
@ -238,13 +241,81 @@ static void hid_set_config(u16 wValue)
systick_counter_enable();
}
static uint8_t spi_readwrite(uint32_t spi, uint8_t data)
{
while(SPI_SR(spi) & SPI_SR_BSY);
SPI_DR(spi) = data;
while(!(SPI_SR(spi) & SPI_SR_RXNE));
return SPI_DR(spi);
}
static uint8_t accel_read(uint8_t addr)
{
uint8_t ret;
gpio_clear(GPIOB, GPIO12);
spi_readwrite(SPI2, addr | 0x80);
ret = spi_readwrite(SPI2, 0);
gpio_set(GPIOB, GPIO12);
return ret;
}
static void accel_write(uint8_t addr, uint8_t data)
{
gpio_clear(GPIOB, GPIO12);
spi_readwrite(SPI2, addr);
spi_readwrite(SPI2, data);
gpio_set(GPIOB, GPIO12);
}
static void accel_get(int16_t *x, int16_t *y, int16_t *z)
{
if(x)
*x = accel_read(ADXL345_DATAX0) |
(accel_read(ADXL345_DATAX1) << 8);
if(y)
*y = accel_read(ADXL345_DATAY0) |
(accel_read(ADXL345_DATAY1) << 8);
if(z)
*z = accel_read(ADXL345_DATAZ0) |
(accel_read(ADXL345_DATAZ1) << 8);
}
int main(void)
{
rcc_clock_setup_in_hse_12mhz_out_72mhz();
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_SPI2EN);
/* Configure SPI2: PB13(SCK), PB14(MISO), PB15(MOSI) */
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_10_MHZ,
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL,
GPIO_SPI2_SCK | GPIO_SPI2_MOSI);
gpio_set_mode(GPIOB, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT,
GPIO_SPI2_MISO);
/* Enable CS pin on PB12 */
gpio_set(GPIOB, GPIO12);
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_10_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
/* Force to SPI mode. This should be default after reset! */
SPI2_I2SCFGR = 0;
spi_init_master(SPI2,
SPI_CR1_BAUDRATE_FPCLK_DIV_256,
SPI_CR1_CPOL_CLK_TO_1_WHEN_IDLE,
SPI_CR1_CPHA_CLK_TRANSITION_2,
SPI_CR1_DFF_8BIT,
SPI_CR1_MSBFIRST);
/* Ignore the stupid NSS pin */
spi_enable_software_slave_management(SPI2);
spi_set_nss_high(SPI2);
spi_enable(SPI2);
uint8_t x = accel_read(ADXL345_DEVID);
accel_write(ADXL345_POWER_CTL, ADXL345_POWER_CTL_MEASURE);
accel_write(ADXL345_DATA_FORMAT, ADXL345_DATA_FORMAT_LALIGN);
/* USB_DETECT as input */
gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
@ -275,14 +346,12 @@ int main(void)
void sys_tick_handler(void)
{
static int x = 0;
static int dir = 1;
int16_t x, y;
u8 buf[4] = {0, 0, 0, 0};
buf[1] = dir;
x += dir;
if(x > 30) dir = -dir;
if(x < -30) dir = -dir;
accel_get(&x, &y, NULL);
buf[1] = x >> 9;
buf[2] = y >> 9;
usbd_ep_write_packet(0x81, buf, 4);
}