Add a bunch of stuff: Add baudrate reconfig command to shell and move the uart to separate C file

stm-firmware/ui/shell-uart.c

@@ -0,0 +1,130 @@
+/* Reflow Oven Controller
+*
+* Copyright (C) 2021  Mario Hüttel <mario.huettel@gmx.net>
+*
+* This file is part of the Reflow Oven Controller Project.
+*
+* The reflow oven controller is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+* The Reflow Oven Control Firmware 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 the reflow oven controller project.
+* If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <reflow-controller/ui/shell-uart.h>
+#include <reflow-controller/periph-config/shell-uart-config.h>
+#include <stm-periph/stm32-gpio-macros.h>
+#include <stm-periph/uart.h>
+#include <helper-macros/helper-macros.h>
+
+/**
+ * @brief TX buffer for the shell's uart
+ */
+static char shell_uart_tx_buff[4096];
+
+/**
+ * @brief RX buffer for the shell's uart
+ */
+static char shell_uart_rx_buff[128];
+
+/**
+ * @brief The uart instance handling the shellmatta shell.
+ */
+struct stm_uart shell_uart;
+
+void shell_uart_setup(void)
+{
+	struct stm_uart *uart = &shell_uart;
+
+	uart->rx = 1;
+	uart->tx = 1;
+	uart->brr_val = SHELL_UART_DEFAULT_BRR_REG_VALUE;
+	uart->rcc_reg = &SHELL_UART_RCC_REG;
+	uart->rcc_bit_no = BITMASK_TO_BITNO(SHELL_UART_RCC_MASK);
+	uart->uart_dev = SHELL_UART_PERIPH;
+	uart->dma_rx_buff = shell_uart_rx_buff;
+	uart->dma_tx_buff = shell_uart_tx_buff;
+	uart->rx_buff_count = sizeof(shell_uart_rx_buff);
+	uart->tx_buff_count = sizeof(shell_uart_tx_buff);
+	uart->base_dma_num = 2;
+	uart->dma_rx_stream = SHELL_UART_RECEIVE_DMA_STREAM;
+	uart->dma_tx_stream = SHELL_UART_SEND_DMA_STREAM;
+	uart->dma_rx_trigger_channel = SHELL_UART_RX_DMA_TRIGGER;
+	uart->dma_tx_trigger_channel = SHELL_UART_TX_DMA_TRIGGER;
+
+	uart_init(uart);
+	NVIC_EnableIRQ(DMA2_Stream7_IRQn);
+}
+
+shellmatta_retCode_t shell_uart_write_callback(const char *data, uint32_t len)
+{
+	uart_send_array_with_dma(&shell_uart, data, len);
+	return SHELLMATTA_OK;
+}
+
+int shell_uart_receive_data_with_dma(const char **data, size_t *len)
+{
+	return uart_receive_data_with_dma(&shell_uart, data, len);
+}
+
+int32_t shell_uart_reconfig_baud(uint32_t new_baud)
+{
+	uint32_t brr_val_floor;
+	uint32_t brr_val_remainder;
+	uint32_t error_permille;
+	int64_t actual_baud;
+
+	/* Calculate the new BRR register value */
+	brr_val_floor = SHELL_UART_PERIPHERAL_CLOCK / new_baud;
+	brr_val_remainder =  SHELL_UART_PERIPHERAL_CLOCK % new_baud;
+
+	/* Round to the nearest value */
+	if (brr_val_remainder > (new_baud / 2u)) {
+		brr_val_floor++;
+		brr_val_remainder = new_baud - brr_val_remainder;
+	}
+
+	actual_baud = (1000U *(int64_t)SHELL_UART_PERIPHERAL_CLOCK) / brr_val_floor;
+	error_permille = (ABS(actual_baud - 1000U * (int64_t)new_baud)) / (int64_t)new_baud;
+
+
+	if (error_permille < 20u) {
+		uart_change_brr(&shell_uart, brr_val_floor);
+	} else {
+		return -1;
+	}
+
+	return (int32_t)error_permille;
+}
+
+uint32_t shell_uart_get_current_baudrate(void)
+{
+	uint32_t brr;
+
+	brr = uart_get_brr(&shell_uart);
+	if (brr == 0)
+		return 0;
+
+	return (SHELL_UART_PERIPHERAL_CLOCK) / brr;
+}
+
+
+/**
+ * @brief Handles the TX of UART1 (Shellmatta)
+ */
+void DMA2_Stream7_IRQHandler(void)
+{
+	uint32_t hisr = DMA2->HISR & (0x3F << 22);
+
+	DMA2->HIFCR = hisr;
+
+	if (hisr & DMA_HISR_TCIF7)
+		uart_tx_dma_complete_int_callback(&shell_uart);
+}