adding spi exemple to stm32vl-discovery
This commit is contained in:
Barattero Laurent
committed by
Piotr Esden-Tempski
Piotr Esden-Tempski
parent
ddd5d5a918
commit
f6a1a3ee14
25
examples/stm32/f1/stm32vl-discovery/spi/Makefile
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25
examples/stm32/f1/stm32vl-discovery/spi/Makefile
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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser General Public License as published by
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## the Free Software Foundation, either version 3 of the License, or
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## (at your option) any later version.
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##
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## This library is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = spi
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LDSCRIPT = ../stm32vl-discovery.ld
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include ../../Makefile.include
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13
examples/stm32/f1/stm32vl-discovery/spi/README
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examples/stm32/f1/stm32vl-discovery/spi/README
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This example program demonstrates simple SPI transceive on stm32vl discovery board.
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The terminal settings for the receiving device/PC are 9600 8n1.
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The example expects a loopback connection between the MISO and MOSI pins on
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SPI1.
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A counter increments and the spi sends this byte out, after which it should
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come back in to the rx buffer, and the result is reported on the uart.
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161
examples/stm32/f1/stm32vl-discovery/spi/spi.c
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161
examples/stm32/f1/stm32vl-discovery/spi/spi.c
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2013 Stephen Dwyer <scdwyer@ualberta.ca>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/usart.h>
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#include <libopencm3/stm32/spi.h>
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#include <stdio.h>
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#include <errno.h>
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int _write(int file, char *ptr, int len);
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static void clock_setup(void)
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{
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rcc_clock_setup_in_hse_8mhz_out_24mhz();
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/* Enable GPIOA, GPIOB, GPIOC clock. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR,
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RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN |
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RCC_APB2ENR_IOPCEN);
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/* Enable clocks for GPIO port A (for GPIO_USART2_TX) and USART2. */
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN |
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RCC_APB2ENR_AFIOEN);
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rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USART2EN);
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/* Enable SPI1 Periph and gpio clocks */
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rcc_peripheral_enable_clock(&RCC_APB2ENR,
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RCC_APB2ENR_SPI1EN);
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}
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static void spi_setup(void) {
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/* Configure GPIOs: SS=PA4, SCK=PA5, MISO=PA6 and MOSI=PA7 */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO4 |
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GPIO5 |
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GPIO7 );
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gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT,
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GPIO6);
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/* Reset SPI, SPI_CR1 register cleared, SPI is disabled */
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spi_reset(SPI1);
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/* Set up SPI in Master mode with:
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* Clock baud rate: 1/64 of peripheral clock frequency
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* Clock polarity: Idle High
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* Clock phase: Data valid on 2nd clock pulse
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* Data frame format: 8-bit
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* Frame format: MSB First
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*/
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spi_init_master(SPI1, SPI_CR1_BAUDRATE_FPCLK_DIV_64, SPI_CR1_CPOL_CLK_TO_1_WHEN_IDLE,
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SPI_CR1_CPHA_CLK_TRANSITION_2, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
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/*
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* Set NSS management to software.
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*
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* Note:
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* Setting nss high is very important, even if we are controlling the GPIO
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* ourselves this bit needs to be at least set to 1, otherwise the spi
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* peripheral will not send any data out.
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*/
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spi_enable_software_slave_management(SPI1);
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spi_set_nss_high(SPI1);
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/* Enable SPI1 periph. */
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spi_enable(SPI1);
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}
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static void usart_setup(void)
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{
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/* Setup GPIO pin GPIO_USART2_TX and GPIO_USART2_RX. */
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gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
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GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART2_TX);
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gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
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GPIO_CNF_INPUT_FLOAT, GPIO_USART2_RX);
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/* Setup UART parameters. */
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usart_set_baudrate(USART2, 9600);
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usart_set_databits(USART2, 8);
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usart_set_stopbits(USART2, USART_STOPBITS_1);
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usart_set_mode(USART2, USART_MODE_TX_RX);
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usart_set_parity(USART2, USART_PARITY_NONE);
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usart_set_flow_control(USART2, USART_FLOWCONTROL_NONE);
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/* Finally enable the USART. */
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usart_enable(USART2);
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}
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int _write(int file, char *ptr, int len)
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{
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int i;
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if (file == 1) {
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for (i = 0; i < len; i++)
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usart_send_blocking(USART2, ptr[i]);
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return i;
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}
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errno = EIO;
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return -1;
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}
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static void gpio_setup(void)
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{
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/* Set GPIO8 (in GPIO port C) to 'output push-pull'. */
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gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
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}
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int main(void)
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{
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int counter = 0;
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uint16_t rx_value = 0x42;
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clock_setup();
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gpio_setup();
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usart_setup();
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spi_setup();
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/* Blink the LED (PC8) on the board with every transmitted byte. */
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while (1) {
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/* LED on/off */
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gpio_toggle(GPIOC, GPIO8);
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/* printf the value that SPI should send */
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printf("Counter: %i SPI Sent Byte: %i", counter, (uint8_t) counter);
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/* blocking send of the byte out SPI1 */
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spi_send(SPI1, (uint8_t) counter);
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/* Read the byte that just came in (use a loopback between MISO and MOSI
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* to get the same byte back)
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*/
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rx_value = spi_read(SPI1);
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/* printf the byte just received */
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printf(" SPI Received Byte: %i\r\n", rx_value);
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counter++;
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}
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return 0;
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}
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