109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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Copyright 2017 fishpepper <AT> gmail.com
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http:// www.gnu.org/licenses/>.
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author: fishpepper <AT> gmail.com
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*/
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#include "hal_uart.h"
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#include "stm32f10x_rcc.h"
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#include "stm32f10x_usart.h"
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#include "misc.h" // this is actually a stm32 include (nvic stuff)
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#include "debug.h"
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#include "led.h"
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volatile uint8_t hal_debug_txe_is_on;
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void hal_debug_init(void) {
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hal_debug_txe_is_on = 0;
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hal_debug_init_nvic(0);
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hal_debug_init_rcc();
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hal_debug_init_gpio();
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hal_debug_init_mode();
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hal_debug_enable();
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}
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void hal_debug_init_nvic(uint8_t enable) {
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// enable interrupts
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NVIC_InitTypeDef nvic_init;
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// configure the NVIC Preemption Priority Bits
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
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// enable the USART interrupt
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nvic_init.NVIC_IRQChannel = DEBUG_USART_IRQn;
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nvic_init.NVIC_IRQChannelPreemptionPriority = NVIC_PRIO_DEBUG_UART;
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nvic_init.NVIC_IRQChannelSubPriority = 0;
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nvic_init.NVIC_IRQChannelCmd = enable ? ENABLE : DISABLE;
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NVIC_Init(&nvic_init);
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}
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static void hal_debug_init_mode(void) {
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USART_InitTypeDef uart_init;
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// USART configuration:
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// 115200 baud, 8N1
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// no hw flow control
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uart_init.USART_BaudRate = 115200;
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uart_init.USART_WordLength = USART_WordLength_8b;
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uart_init.USART_StopBits = USART_StopBits_1;
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uart_init.USART_Parity = USART_Parity_No;
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uart_init.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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uart_init.USART_Mode = USART_Mode_Tx;
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USART_Init(DEBUG_USART, &uart_init);
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}
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static void hal_debug_enable(void) {
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// enable uart
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USART_Cmd(DEBUG_USART, ENABLE);
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}
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void hal_debug_start_transmission(uint8_t ch) {
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// enable TXE int
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USART_ITConfig(DEBUG_USART, USART_IT_TXE, ENABLE);
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hal_debug_txe_is_on = 1;
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// send first byte
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USART_SendData(DEBUG_USART, ch);
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}
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uint8_t hal_debug_int_enabled(void) {
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// is the txe int enabled?
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return hal_debug_txe_is_on;
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}
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static void hal_debug_init_gpio(void) {
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GPIO_InitTypeDef gpio_init;
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// Configure USART TX as alternate function push-pull
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gpio_init.GPIO_Pin = DEBUG_USART_TX_PIN;
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gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
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gpio_init.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init(DEBUG_USART_GPIO, &gpio_init);
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}
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static void hal_debug_init_rcc(void) {
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// configure clocks for uart:
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// enable GPIO clock
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RCC_APBxPeriphClockCmd(DEBUG_USART_GPIO_CLK_RCC,
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DEBUG_USART_GPIO_CLK | RCC_APB2Periph_AFIO, ENABLE);
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// enable USART clock
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RCC_APBxPeriphClockCmd(DEBUG_USART_CLK_RCC, DEBUG_USART_CLK, ENABLE);
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}
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