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-rw-r--r--libmaple/stm32f1/include/series/usart.h76
-rw-r--r--libmaple/stm32f1/rules.mk1
-rw-r--r--libmaple/stm32f1/usart.c170
3 files changed, 247 insertions, 0 deletions
diff --git a/libmaple/stm32f1/include/series/usart.h b/libmaple/stm32f1/include/series/usart.h
new file mode 100644
index 0000000..93a7728
--- /dev/null
+++ b/libmaple/stm32f1/include/series/usart.h
@@ -0,0 +1,76 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/stm32f1/usart.h
+ * @author Marti Bolivar <mbolivar@leaflabs.com>
+ * @brief STM32F1 USART header.
+ */
+
+#ifndef _LIBMAPLE_STM32F1_USART_H_
+#define _LIBMAPLE_STM32F1_USART_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+/*
+ * Register map base pointers
+ */
+
+struct usart_reg_map;
+
+/** USART1 register map base pointer */
+#define USART1_BASE ((struct usart_reg_map*)0x40013800)
+/** USART2 register map base pointer */
+#define USART2_BASE ((struct usart_reg_map*)0x40004400)
+/** USART3 register map base pointer */
+#define USART3_BASE ((struct usart_reg_map*)0x40004800)
+#ifdef STM32_HIGH_DENSITY
+/** UART4 register map base pointer */
+#define UART4_BASE ((struct usart_reg_map*)0x40004C00)
+/** UART5 register map base pointer */
+#define UART5_BASE ((struct usart_reg_map*)0x40005000)
+#endif
+
+/*
+ * Devices
+ */
+
+struct usart_dev;
+extern struct usart_dev *USART1;
+extern struct usart_dev *USART2;
+extern struct usart_dev *USART3;
+#ifdef STM32_HIGH_DENSITY
+extern struct usart_dev *UART4;
+extern struct usart_dev *UART5;
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libmaple/stm32f1/rules.mk b/libmaple/stm32f1/rules.mk
index 4c7db60..3d34797 100644
--- a/libmaple/stm32f1/rules.mk
+++ b/libmaple/stm32f1/rules.mk
@@ -14,6 +14,7 @@ sSRCS_$(d) := isrs_performance.S \
cSRCS_$(d) := rcc.c
cSRCS_$(d) += gpio.c
cSRCS_$(d) += bkp.c
+cSRCS_$(d) += usart.c
sFILES_$(d) := $(sSRCS_$(d):%=$(d)/%)
cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%)
diff --git a/libmaple/stm32f1/usart.c b/libmaple/stm32f1/usart.c
new file mode 100644
index 0000000..ee68082
--- /dev/null
+++ b/libmaple/stm32f1/usart.c
@@ -0,0 +1,170 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ * Copyright (c) 2010 Perry Hung.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/stm32f1/usart.c
+ * @author Marti Bolivar <mbolivar@leaflabs.com>,
+ * Perry Hung <perry@leaflabs.com>
+ * @brief STM32F1 USART support.
+ */
+
+#include <libmaple/usart.h>
+#include <libmaple/gpio.h>
+#include "usart_private.h"
+
+/*
+ * Devices
+ */
+
+static ring_buffer usart1_rb;
+static usart_dev usart1 = {
+ .regs = USART1_BASE,
+ .rb = &usart1_rb,
+ .max_baud = 4500000UL,
+ .clk_id = RCC_USART1,
+ .irq_num = NVIC_USART1,
+};
+/** USART1 device */
+usart_dev *USART1 = &usart1;
+
+static ring_buffer usart2_rb;
+static usart_dev usart2 = {
+ .regs = USART2_BASE,
+ .rb = &usart2_rb,
+ .max_baud = 2250000UL,
+ .clk_id = RCC_USART2,
+ .irq_num = NVIC_USART2,
+};
+/** USART2 device */
+usart_dev *USART2 = &usart2;
+
+static ring_buffer usart3_rb;
+static usart_dev usart3 = {
+ .regs = USART3_BASE,
+ .rb = &usart3_rb,
+ .max_baud = 2250000UL,
+ .clk_id = RCC_USART3,
+ .irq_num = NVIC_USART3,
+};
+/** USART3 device */
+usart_dev *USART3 = &usart3;
+
+#if defined(STM32_HIGH_DENSITY) || defined(STM32_XL_DENSITY)
+static ring_buffer uart4_rb;
+static usart_dev uart4 = {
+ .regs = UART4_BASE,
+ .rb = &uart4_rb,
+ .max_baud = 2250000UL,
+ .clk_id = RCC_UART4,
+ .irq_num = NVIC_UART4,
+};
+/** UART4 device */
+usart_dev *UART4 = &uart4;
+
+static ring_buffer uart5_rb;
+static usart_dev uart5 = {
+ .regs = UART5_BASE,
+ .rb = &uart5_rb,
+ .max_baud = 2250000UL,
+ .clk_id = RCC_UART5,
+ .irq_num = NVIC_UART5,
+};
+/** UART5 device */
+usart_dev *UART5 = &uart5;
+#endif
+
+/*
+ * Routines
+ */
+
+void usart_async_gpio_cfg(usart_dev *udev,
+ gpio_dev *rx_dev, uint8 rx,
+ gpio_dev *tx_dev, uint8 tx,
+ unsigned flags) {
+ gpio_set_mode(rx_dev, rx, GPIO_INPUT_FLOATING);
+ gpio_set_mode(tx_dev, tx, GPIO_AF_OUTPUT_PP);
+}
+
+void usart_set_baud_rate(usart_dev *dev, uint32 clock_speed, uint32 baud) {
+ uint32 integer_part;
+ uint32 fractional_part;
+ uint32 tmp;
+
+ /* Figure out the clock speed, if the user doesn't give one. */
+ if (clock_speed == 0) {
+ clock_speed = _usart_clock_freq(dev);
+ }
+ ASSERT(clock_speed);
+
+ /* Convert desired baud rate to baud rate register setting. */
+ integer_part = (25 * clock_speed) / (4 * baud);
+ tmp = (integer_part / 100) << 4;
+ fractional_part = integer_part - (100 * (tmp >> 4));
+ tmp |= (((fractional_part * 16) + 50) / 100) & ((uint8)0x0F);
+
+ dev->regs->BRR = (uint16)tmp;
+}
+
+/**
+ * @brief Call a function on each USART.
+ * @param fn Function to call.
+ */
+void usart_foreach(void (*fn)(usart_dev*)) {
+ fn(USART1);
+ fn(USART2);
+ fn(USART3);
+#ifdef STM32_HIGH_DENSITY
+ fn(UART4);
+ fn(UART5);
+#endif
+}
+
+/*
+ * Interrupt handlers.
+ */
+
+void __irq_usart1(void) {
+ usart_irq(&usart1_rb, USART1_BASE);
+}
+
+void __irq_usart2(void) {
+ usart_irq(&usart2_rb, USART2_BASE);
+}
+
+void __irq_usart3(void) {
+ usart_irq(&usart3_rb, USART3_BASE);
+}
+
+#ifdef STM32_HIGH_DENSITY
+void __irq_uart4(void) {
+ usart_irq(&uart4_rb, UART4_BASE);
+}
+
+void __irq_uart5(void) {
+ usart_irq(&uart5_rb, UART5_BASE);
+}
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 10:32:14 +0000