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#include "project.h"
#define BUFFER_SIZE 256
#define BIG_BUFFER_SIZE 600
volatile ring_t usart2_rx_ring;
static uint8_t usart2_rx_ring_buf[BUFFER_SIZE];
volatile ring_t usart2_tx_ring;
static uint8_t usart2_tx_ring_buf[BUFFER_SIZE];
volatile ring_t usart1_rx_ring;
static uint8_t usart1_rx_ring_buf[BUFFER_SIZE];
volatile ring_t usart1_tx_ring;
static uint8_t usart1_tx_ring_buf[BUFFER_SIZE];
#define TX1 GPIO9
#define TX1_PORT GPIOA
#define RX1 GPIO10
#define RX1_PORT GPIOA
#define TX2 GPIO5
#define TX2_PORT GPIOD
#define RX2 GPIO6
#define RX2_PORT GPIOD
#define RX2_EN GPIO4
#define RX2_EN_PORT GPIOG
void usart2_isr (void)
{
uint8_t data;
/* Check if we were called because of RXNE. */
if (((USART_CR1 (USART2) & USART_CR1_RXNEIE) != 0) &&
((USART_SR (USART2) & USART_SR_RXNE) != 0)) {
/* Retrieve the data from the peripheral. */
data = usart_recv (USART2);
ring_write_byte (&usart2_rx_ring, data);
//usart6_queue(data);
}
/* Check if we were called because of TXE. */
if (((USART_CR1 (USART2) & USART_CR1_TXEIE) != 0) &&
((USART_SR (USART2) & USART_SR_TXE) != 0)) {
if (ring_read_byte (&usart2_tx_ring, &data)) {
/*No more data, Disable the TXE interrupt, it's no longer needed. */
usart_disable_tx_interrupt (USART2);
} else
usart_send_blocking (USART2, data);
}
}
void
usart2_queue (uint8_t d)
{
ring_write_byte (&usart2_tx_ring, d);
usart_enable_tx_interrupt (USART2);
}
void
usart2_drain (void)
{
while (!ring_empty (&usart2_tx_ring));
}
int
usart2_write (char *ptr, int len, int blocking)
{
int ret;
ret = ring_write (&usart2_tx_ring, (uint8_t *) ptr, len, blocking);
usart_enable_tx_interrupt (USART2);
return ret;
}
void usart1_isr (void)
{
uint8_t data;
/* Check if we were called because of RXNE. */
if (((USART_CR1 (USART1) & USART_CR1_RXNEIE) != 0) &&
((USART_SR (USART1) & USART_SR_RXNE) != 0)) {
/* Retrieve the data from the peripheral. */
data = usart_recv (USART1);
ring_write_byte (&usart1_rx_ring, data);
}
/* Check if we were called because of TXE. */
if (((USART_CR1 (USART1) & USART_CR1_TXEIE) != 0) &&
((USART_SR (USART1) & USART_SR_TXE) != 0)) {
if (ring_read_byte (&usart1_tx_ring, &data)) {
/*No more data, Disable the TXE interrupt, it's no longer needed. */
usart_disable_tx_interrupt (USART1);
} else
usart_send_blocking (USART1, data);
}
}
void
usart1_queue (uint8_t d)
{
ring_write_byte (&usart1_tx_ring, d);
usart_enable_tx_interrupt (USART1);
}
void
usart1_drain (void)
{
while (!ring_empty (&usart1_tx_ring));
}
int
usart1_write (char *ptr, int len, int blocking)
{
int ret;
ret = ring_write (&usart1_tx_ring, (uint8_t *) ptr, len, blocking);
usart_enable_tx_interrupt (USART1);
return ret;
}
void usart_rings_init (void)
{
ring_init (&usart1_rx_ring, usart1_rx_ring_buf, sizeof (usart1_rx_ring_buf));
ring_init (&usart1_tx_ring, usart1_tx_ring_buf, sizeof (usart1_tx_ring_buf));
ring_init (&usart2_rx_ring, usart2_rx_ring_buf, sizeof (usart2_rx_ring_buf));
ring_init (&usart2_tx_ring, usart2_tx_ring_buf, sizeof (usart2_tx_ring_buf));
}
void
usart_init (void)
{
MAP_OUTPUT_PP (RX2_EN);
SET (RX2_EN);
MAP_INPUT (RX2);
MAP_AF (TX2, GPIO_AF7);
MAP_AF_PU (RX2, GPIO_AF7);
usart_set_baudrate (USART2, 38400);
usart_set_databits (USART2, 8);
usart_set_stopbits (USART2, USART_STOPBITS_1);
usart_set_parity (USART2, USART_PARITY_NONE);
usart_set_flow_control (USART2, USART_FLOWCONTROL_NONE);
usart_set_mode (USART2, USART_MODE_TX_RX);
usart_enable_rx_interrupt (USART2);
usart_enable (USART2);
nvic_enable_irq (NVIC_USART2_IRQ);
MAP_INPUT (RX1);
MAP_AF (TX1, GPIO_AF7);
MAP_AF_PU (RX1, GPIO_AF7);
usart_set_baudrate (USART1, 9600);
usart_set_databits (USART1, 8);
usart_set_stopbits (USART1, USART_STOPBITS_1);
usart_set_parity (USART1, USART_PARITY_NONE);
usart_set_flow_control (USART1, USART_FLOWCONTROL_NONE);
usart_set_mode (USART1, USART_MODE_TX_RX);
usart_enable_rx_interrupt (USART1);
usart_enable (USART1);
nvic_enable_irq (NVIC_USART1_IRQ);
}
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