diff options
Diffstat (limited to '02-usart/src/main.c')
| -rw-r--r-- | 02-usart/src/main.c | 40 |
1 files changed, 17 insertions, 23 deletions
diff --git a/02-usart/src/main.c b/02-usart/src/main.c index 8b98cbf..d26dce4 100644 --- a/02-usart/src/main.c +++ b/02-usart/src/main.c @@ -8,6 +8,7 @@ #include "core/nvic.h" #include "core/irq.h" +#include "peri/dma.h" #include "delay.h" #include "mem.h" #include "spin.h" @@ -64,37 +65,30 @@ int main() setup_usart2(115200); regset(USART2.c_r1, usart_txeie, 1); regset(USART2.c_r1, usart_rxneie, 1); + usart_enable_dma(&USART2, USART_ENABLE_TX); usart_set_enabled(&USART2, USART_ENABLE_TX | USART_ENABLE_RX); - enable_interrupt(IRQ_USART2); - USART2.td_r = (uint8_t) 0x61; + dma_opts_t opts = DEFAULT_DMA_OPTS; + opts.transfer_complete_interrupt_enable = 1; + int ec = 0; + dma_mem2p_channel_t dma_chan = + select_dma_channel_mem2p(DMA1_PERIPH_USART2_TX, &opts, &ec); + enable_interrupt(dma_channel_get_interrupt(dma_chan.c_)); + + if (ec) { + usart_printf(&USART2, "Select DMA channel failed :( %d\n", ec); + for (;;); + } + + const char* thing = "HELLO DMA!\r\n"; + regset(USART2.ic_r, usart_tccf, 1); + dma_mem2p_initiate_transfer(dma_chan, thing, strlen(thing)); __IO gpio_port_t* port_b = enable_gpio(GPIO_PORT_B); gpio_output_pin_t pin3 = set_gpio_pin_output(port_b, PIN_3); pin_on(pin3); - usart_printf(&USART2, "\nUSART2.c_r1: %p\n", USART2.c_r1); - usart_printf(&USART2, "NVIC intlinesnum: %d\n", - regget(NVIC.ict_r, nvic_intlinesnum)); - - int off = 1; - int last; - for(;;) { - int next = USART2.is_r & usart_rxne; - volatile int y = USART2.rd_r; - if (next) - USART2.td_r = y; - if (last != next) { - if (off) { - pin_on(pin3); - } else { - pin_off(pin3); - } - off = !off; - } - } - // usart_printf(&USART2, "Start Configuring Countdown!\n"); /* Set the countdown to start from 1,000,0000. */ |