reflow-oven-control-sw/stm-firmware/stm-periph/uart.c

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/* Reflow Oven Controller
*
* Copyright (C) 2020 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,
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* 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/>.
*/
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#include <stm-periph/uart.h>
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#include <stm32/stm32f4xx.h>
#include <stm-periph/clock-enable-manager.h>
#include <stm-periph/stm32-gpio-macros.h>
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#include <stm-periph/dma-ring-buffer.h>
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#include <string.h>
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int uart_init(struct stm_uart *uart)
{
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int ret_val = 0;
uint32_t cr3 = 0;
uint32_t cr1 = 0;
if (!uart)
return -1000;
rcc_manager_enable_clock(uart->rcc_reg, uart->rcc_bit_no);
/* Reset all config regs */
uart->uart_dev->CR1 = uart->uart_dev->CR2 = uart->uart_dev->CR3 = 0UL;
/* Set baud rate */
uart->uart_dev->BRR = uart->brr_val;
/* If DMA buffers are present, configure for DMA use */
if (uart->dma_rx_buff && uart->rx) {
cr3 |= USART_CR3_DMAR;
ret_val = dma_ring_buffer_periph_to_mem_initialize(&uart->rx_ring_buff,
uart->base_dma_num,
uart->dma_rx_stream,
uart->rx_buff_count,
1U,
uart->dma_rx_buff,
(char *)&uart->uart_dev->DR,
uart->dma_rx_trigger_channel);
if (ret_val)
return ret_val;
}
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if (uart->dma_tx_buff && uart->tx) {
ret_val = dma_ring_buffer_mem_to_periph_initialize(&uart->tx_ring_buff,
uart->base_dma_num,
uart->dma_tx_stream,
uart->tx_buff_count,
1U,
uart->dma_tx_buff,
uart->dma_tx_trigger_channel,
(void *)&uart->uart_dev->DR);
if (ret_val)
return ret_val;
cr3 |= USART_CR3_DMAT;
}
uart->uart_dev->CR3 = cr3;
if (uart->tx)
cr1 |= USART_CR1_TE;
if (uart->rx)
cr1 |= USART_CR1_RE;
/* Enable uart */
cr1 |= USART_CR1_UE;
uart->uart_dev->CR1 = cr1;
return 0;
}
void uart_change_brr(struct stm_uart *uart, uint32_t brr)
{
if (!uart || !uart->uart_dev)
return;
uart->brr_val = brr;
uart->uart_dev->BRR = brr;
}
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void uart_disable(struct stm_uart *uart)
{
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if (!uart)
return;
uart->uart_dev->CR1 = 0;
uart->uart_dev->CR2 = 0;
uart->uart_dev->CR3 = 0;
if (uart->rx && uart->dma_rx_buff)
dma_ring_buffer_periph_to_mem_stop(&uart->rx_ring_buff);
if (uart->dma_tx_buff && uart->tx)
dma_ring_buffer_mem_to_periph_stop(&uart->tx_ring_buff);
rcc_manager_disable_clock(uart->rcc_reg, uart->rcc_bit_no);
}
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void uart_send_char(struct stm_uart *uart, char c)
{
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if (!uart || !uart->uart_dev)
return;
while(!(uart->uart_dev->SR & USART_SR_TXE));
uart->uart_dev->DR = c;
}
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void uart_send_array(struct stm_uart *uart, const char *data, uint32_t len)
{
uint32_t i;
for (i = 0; i < len; i++)
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uart_send_char(uart, data[i]);
}
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void uart_send_string(struct stm_uart *uart, const char *string)
{
int i;
for (i = 0; string[i] != '\0'; i++)
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uart_send_char(uart, string[i]);
}
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void uart_send_array_with_dma(struct stm_uart *uart, const char *data, uint32_t len)
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{
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if (!uart || !uart->dma_tx_buff)
return;
dma_ring_buffer_mem_to_periph_insert_data(&uart->tx_ring_buff, data, len);
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}
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void uart_send_string_with_dma(struct stm_uart *uart, const char *string)
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{
size_t len;
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len = strlen(string);
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uart_send_array_with_dma(uart, string, (uint32_t)len);
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}
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int uart_receive_data_with_dma(struct stm_uart *uart, const char **data, size_t *len)
{
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if (!uart)
return -1000;
return dma_ring_buffer_periph_to_mem_get_data(&uart->rx_ring_buff, (const volatile void **)data, len);
}
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char uart_get_char(struct stm_uart *uart)
{
if (!uart)
return 0;
/* Wait for data to be available */
while (!(uart->uart_dev->SR & USART_SR_RXNE));
return (char)uart->uart_dev->DR;
}
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int uart_check_rx_avail(struct stm_uart *uart)
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{
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if (!uart)
return 0;
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if (uart->uart_dev->SR & USART_SR_RXNE)
return 1;
else
return 0;
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}
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void uart_tx_dma_complete_int_callback(struct stm_uart *uart)
{
if (!uart)
return;
dma_ring_buffer_mem_to_periph_int_callback(&uart->tx_ring_buff);
}
size_t uart_dma_tx_queue_avail(struct stm_uart *uart)
{
size_t fill_level = 0UL;
if (!uart)
return 0UL;
(void)dma_ring_buffer_mem_to_periph_fill_level(&uart->tx_ring_buff, &fill_level);
return fill_level;
}
size_t uart_dma_rx_queue_avail(struct stm_uart *uart)
{
size_t fill_level = 0UL;
if (!uart)
return 0UL;
(void)dma_ring_buffer_periph_to_mem_fill_level(&uart->rx_ring_buff, &fill_level);
return fill_level;
}