Remove STM32 variant (and submodule libopencm3)

[z180-stamp.git] / stm32 / serial.c

diff --git a/stm32/serial.c b/stm32/serial.c
deleted file mode 100644 (file)
index d2f1a93..0000000
--- a/stm32/serial.c
+++ /dev/null
@@ -1,193 +0,0 @@
-/*
- * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
- *
- * SPDX-License-Identifier:    GPL-2.0+
- */
-
-#include <errno.h>
-#include <stdio.h>
-#include <unistd.h>
-
-#include <libopencm3/stm32/gpio.h>
-#include <libopencm3/stm32/usart.h>
-#include <libopencm3/cm3/nvic.h>
-#include "serial.h"
-
-
-#define USART_CONSOLE USART1
-
-int _write(int fd, char *ptr, int len)  __attribute__((used));
-
-
-struct ring {
-       uint8_t *data;
-       int size;
-       volatile int begin;
-       volatile int end;
-};
-
-
-#define BUFFER_SIZE 256
-
-struct ring rx_ring;
-struct ring tx_ring;
-uint8_t rx_ring_buffer[BUFFER_SIZE];
-uint8_t tx_ring_buffer[BUFFER_SIZE];
-
-
-static void ring_init(struct ring *ring, uint8_t *buf, int size)
-{
-       ring->data = buf;
-       ring->size = size;
-       ring->begin = 0;
-       ring->end = 0;
-}
-
-static int ring_write_ch(struct ring *ring, uint8_t ch)
-{
-       int ep = (ring->end + 1) % ring->size;
-
-       if ((ep) != ring->begin) {
-               ring->data[ring->end] = ch;
-               ring->end = ep;
-               return 1;
-       }
-
-       return -1;
-}
-
-static int ring_write(struct ring *ring, uint8_t *data, int size)
-{
-       int i;
-
-       for (i = 0; i < size; i++) {
-               if (ring_write_ch(ring, data[i]) < 0)
-                       return -i;
-       }
-
-       return i;
-}
-
-static int ring_read_ch(struct ring *ring)
-{
-       int ret = -1;
-
-       if (ring->begin != ring->end) {
-               ret = ring->data[ring->begin];
-               ring->begin = (ring->begin +1) % ring->size;
-       }
-
-       return ret;
-}
-
-void usart_setup(void)
-{
-       /* Initialize output ring buffer. */
-       ring_init(&rx_ring, rx_ring_buffer, BUFFER_SIZE);
-       ring_init(&tx_ring, tx_ring_buffer, BUFFER_SIZE);
-
-       /* Enable the USART1 interrupt. */
-       nvic_enable_irq(NVIC_USART1_IRQ);
-
-       /* Setup GPIO pin GPIO_USART1_TX/LED_GREEN_PIN on GPIO port A for transmit. */
-       /* TODO: USART1 --> USART_CONSOLE */
-
-       gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ,
-                     GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
-
-       /* Setup GPIO pin GPIO_USART1_RE_RX on GPIO port B for receive. */
-       gpio_set_mode(GPIOA, GPIO_MODE_INPUT,
-                     GPIO_CNF_INPUT_FLOAT, GPIO_USART1_RX);
-
-       /* Setup UART parameters. */
-//     usart_set_baudrate(USART_CONSOLE, 38400);
-       usart_set_baudrate(USART_CONSOLE, 115200);
-       usart_set_databits(USART_CONSOLE, 8);
-       usart_set_stopbits(USART_CONSOLE, USART_STOPBITS_1);
-       usart_set_parity(USART_CONSOLE, USART_PARITY_NONE);
-       usart_set_flow_control(USART_CONSOLE, USART_FLOWCONTROL_NONE);
-       usart_set_mode(USART_CONSOLE, USART_MODE_TX_RX);
-
-       /* Enable USART1 Receive interrupt. */
-       USART_CR1(USART1) |= USART_CR1_RXNEIE;
-
-       /* Finally enable the USART. */
-       usart_enable(USART_CONSOLE);
-}
-
-void usart1_isr(void)
-{
-       /* 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. */
-               ring_write_ch(&rx_ring, usart_recv(USART1));
-
-       }
-
-       /* Check if we were called because of TXE. */
-       if (((USART_CR1(USART1) & USART_CR1_TXEIE) != 0) &&
-           ((USART_SR(USART1) & USART_SR_TXE) != 0)) {
-
-               int data;
-
-               data = ring_read_ch(&tx_ring);
-
-               if (data == -1) {
-                       /* Disable the TXE interrupt, it's no longer needed. */
-                       USART_CR1(USART1) &= ~USART_CR1_TXEIE;
-               } else {
-                       /* Put data into the transmit register. */
-                       usart_send(USART1, data);
-               }
-       }
-}
-
-/*--------------------------------------------------------------------------*/
-
-void serial_setup(void)
-{
-       usart_setup();
-}
-
-/*--------------------------------------------------------------------------*/
-
-/**
- * Use USART_CONSOLE as a console.
- * This is a syscall for newlib
- * @param fd
- * @param ptr
- * @param len
- * @return
- */
-int _write(int fd, char *ptr, int len)
-{
-       int i;
-
-       if (fd == STDOUT_FILENO || fd == STDERR_FILENO) {
-               for (i = 0; i < len; i++) {
-                       if (ptr[i] == '\n') {
-                               serial_putc('\r');
-                       }
-                       serial_putc(ptr[i]);
-               }
-               return i;
-       }
-       errno = EIO;
-       return -1;
-}
-
-int serial_getc(void)
-{
-       return ring_read_ch(&rx_ring);
-}
-
-void serial_putc(uint8_t data)
-{
-       while (ring_write_ch(&tx_ring, data) < 0)
-               ;
-
-       /* Enable the TXE interrupt. */
-       USART_CR1(USART1) |= USART_CR1_TXEIE;
-}