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authorUwe Hermann2010-12-30 01:52:44 +0100
committerUwe Hermann2010-12-30 01:52:44 +0100
commitbcce98da54b047a15ef0abf41e0c7794f29f0439 (patch)
tree98462dcb9874341bd7342a1794ec01e8ad420d47 /examples/stm32/other/dma_mem2mem/dma.c
parentb65f3f06d061823fac1af91594e0d702b4c80693 (diff)
Move STM32 examples to examples/stm32 subdir.
Diffstat (limited to 'examples/stm32/other/dma_mem2mem/dma.c')
-rw-r--r--examples/stm32/other/dma_mem2mem/dma.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/examples/stm32/other/dma_mem2mem/dma.c b/examples/stm32/other/dma_mem2mem/dma.c
new file mode 100644
index 0000000..b609497
--- /dev/null
+++ b/examples/stm32/other/dma_mem2mem/dma.c
@@ -0,0 +1,133 @@
+/*
+ * This file is part of the libopenstm32 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 <libopenstm32/rcc.h>
+#include <libopenstm32/flash.h>
+#include <libopenstm32/gpio.h>
+#include <libopenstm32/usart.h>
+#include <libopenstm32/dma.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);
+ 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;
+}