134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*
|
|
* This file is part of the libopencm3 project.
|
|
*
|
|
* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include <libopencm3/stm32/f1/rcc.h>
|
|
#include <libopencm3/stm32/f1/flash.h>
|
|
#include <libopencm3/stm32/f1/gpio.h>
|
|
#include <libopencm3/stm32/f1/dma.h>
|
|
#include <libopencm3/stm32/usart.h>
|
|
|
|
void usart_setup(void)
|
|
{
|
|
/* Enable clocks for GPIO port A (for GPIO_USART1_TX) and USART1. */
|
|
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
|
|
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_USART1EN);
|
|
|
|
/* Setup GPIO pin GPIO_USART1_TX/GPIO9 on GPIO port A for transmit. */
|
|
gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
|
|
GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
|
|
|
|
/* Setup UART parameters. */
|
|
usart_set_baudrate(USART1, 115200, rcc_ppre2_frequency);
|
|
usart_set_databits(USART1, 8);
|
|
usart_set_stopbits(USART1, USART_STOPBITS_1);
|
|
usart_set_mode(USART1, USART_MODE_TX_RX);
|
|
usart_set_parity(USART1, USART_PARITY_NONE);
|
|
usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
|
|
|
|
/* Finally enable the USART. */
|
|
usart_enable(USART1);
|
|
}
|
|
|
|
void gpio_setup(void)
|
|
{
|
|
/* Enable GPIOB clock. */
|
|
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
|
|
|
|
/* Set GPIO6/7 (in GPIO port B) to 'output push-pull' for the LEDs. */
|
|
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
|
|
GPIO_CNF_OUTPUT_PUSHPULL, GPIO6);
|
|
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
|
|
GPIO_CNF_OUTPUT_PUSHPULL, GPIO7);
|
|
}
|
|
|
|
void my_usart_print_string(u32 usart, char * s)
|
|
{
|
|
while (*s != 0) {
|
|
usart_send(usart, *s);
|
|
s++;
|
|
}
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
/* Exactly 20 bytes including '0' at the end.
|
|
We want to transfer 32bit * 5 so it should fit */
|
|
char s1[20] = "Hello STM MEM2MEM\r\n";
|
|
char s2[20];
|
|
|
|
rcc_clock_setup_in_hse_16mhz_out_72mhz();
|
|
gpio_setup();
|
|
usart_setup();
|
|
|
|
gpio_clear(GPIOB, GPIO7); /* LED1 on */
|
|
gpio_set(GPIOB, GPIO6); /* LED2 off */
|
|
|
|
my_usart_print_string(USART1, "s1 ");
|
|
my_usart_print_string(USART1, s1);
|
|
|
|
rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_DMA1EN);
|
|
|
|
/* MEM2MEM mode for channel 1. */
|
|
dma_enable_mem2mem_mode(DMA1, DMA_CHANNEL1);
|
|
|
|
/* Highest priority. */
|
|
dma_set_priority(DMA1, DMA_CHANNEL1, DMA_CCR1_PL_VERY_HIGH);
|
|
|
|
/* 32Bit wide transfer for source and destination. */
|
|
dma_set_memory_size(DMA1, DMA_CHANNEL1, DMA_CCR1_MSIZE_32BIT);
|
|
dma_set_peripheral_size(DMA1, DMA_CHANNEL1, DMA_CCR1_PSIZE_32BIT);
|
|
|
|
/* After each 32Bit we have to increase the addres because we use RAM. */
|
|
dma_enable_memory_increment_mode(DMA1, DMA_CHANNEL1);
|
|
dma_enable_peripheral_increment_mode(DMA1, DMA_CHANNEL1);
|
|
|
|
/* We define the source as peripheral. */
|
|
dma_set_read_from_peripheral(DMA1, DMA_CHANNEL1);
|
|
|
|
/* We want to transfer string s1. */
|
|
dma_set_peripheral_address(DMA1, DMA_CHANNEL1, (u32) &s1);
|
|
|
|
/* Destination should be string s2. */
|
|
dma_set_memory_address(DMA1, DMA_CHANNEL1, (u32) &s2);
|
|
|
|
/* Set number of DATA to transfer.
|
|
Remember that this means not necessary bytes but MSIZE or PSIZE
|
|
depending from your source device. */
|
|
dma_set_number_of_data(DMA1, DMA_CHANNEL1, 5);
|
|
|
|
/* Start DMA transfer. */
|
|
dma_enable_channel(DMA1, DMA_CHANNEL1);
|
|
|
|
/* TODO: write a function to get the interrupt flags. */
|
|
while(!(DMA_ISR(DMA1) & 0x0000001))
|
|
{
|
|
}
|
|
|
|
dma_disable_channel(DMA1, DMA_CHANNEL1);
|
|
|
|
/* String s1 should now already be transferred to s2. */
|
|
my_usart_print_string(USART1, "s2 ");
|
|
my_usart_print_string(USART1, s2);
|
|
|
|
gpio_clear(GPIOB, GPIO6); /* LED2 on */
|
|
while(1); /* Halt. */
|
|
|
|
return 0;
|
|
}
|