diff options
Diffstat (limited to 'cm3cpp_usart_dma.cpp')
| -rw-r--r-- | cm3cpp_usart_dma.cpp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/cm3cpp_usart_dma.cpp b/cm3cpp_usart_dma.cpp new file mode 100644 index 0000000..a79306a --- /dev/null +++ b/cm3cpp_usart_dma.cpp @@ -0,0 +1,202 @@ +/** + ****************************************************************************** + * @file cm3cpp_usart_dma.cpp + * @author + * @version V1.0 + * @date 05-2019 + * @brief This is file realise uart. + ****************************************************************************** + * @attention + * + ****************************************************************************** + */ + +/* Includes ------------------------------------------------------------------*/ +#include "cm3cpp_usart_dma.hpp" + +#include <cm3cpp_config.h> +#include <libopencm3/stm32/rcc.h> +#include <libopencm3/stm32/usart.h> +#include <string.h> + +namespace cm3cpp { + +namespace usart_dma { + +/** + * Constructor USART-DMA + * @param usart_config - low level config usart + * @param settings - usart settings + * @param dma_tx_config - DMA config for transmission + * @param dma_rx_config - DMA config for receive + */ +UsartDma::UsartDma(const LowLevelConfigUsart& usart_config, + const Settings& settings, + const dma::LowLevelConfig& dma_tx_config, + const dma::LowLevelConfig& dma_rx_config) : + _dma_tx(dma_tx_config), + _dma_rx(dma_rx_config) +{ + // For reset and clock periph + rcc_periph_rst rcc_rst; + rcc_periph_clken rcc_clken; + + switch (usart_config.usart_number) { + case 1: { + _usart = USART1; + rcc_rst = RST_USART1; + rcc_clken = RCC_USART1; + break; + } + case 2: { + _usart = USART2; + rcc_rst = RST_USART2; + rcc_clken = RCC_USART2; + break; + } + case 3: { + _usart = USART3; + rcc_rst = RST_USART3; + rcc_clken = RCC_USART3; + break; + } + case 4: { + _usart = UART4; + rcc_rst = RST_UART4; + rcc_clken = RCC_UART5; + break; + } + case 5: { + _usart = UART5; + rcc_rst = RST_UART5; + rcc_clken = RCC_UART5; + break; + } + default: { + _usart = USART6; + rcc_rst = RST_USART6; + rcc_clken = RCC_USART6; + break; + } + } + + // Reset periph + rcc_periph_reset_pulse(rcc_rst); + // Clock enable + rcc_periph_clock_enable(rcc_clken); + + uint8_t af = GPIO_AF8; + if ((usart_config.usart_number >= 1) && (usart_config.usart_number <= 3)) { + af = GPIO_AF7; + } + + // Config GPIO + if (settings.mode == TX || settings.mode == RX_TX) { + // Pin transmit + port_config_clock_enable(usart_config.tx.port); + gpio_mode_setup(usart_config.tx.port, GPIO_MODE_AF, GPIO_PUPD_NONE, + usart_config.tx.pin); + + gpio_set_af(usart_config.tx.port, af, usart_config.tx.pin); + usart_enable_tx_dma(_usart); + } + + if (settings.mode == RX || settings.mode == RX_TX) { + // Pin receive + port_config_clock_enable(usart_config.rx.port); + gpio_mode_setup(usart_config.rx.port, GPIO_MODE_AF, GPIO_PUPD_NONE, + usart_config.rx.pin); + + gpio_set_af(usart_config.tx.port, af, usart_config.tx.pin); + gpio_set_output_options(usart_config.rx.port, GPIO_OTYPE_OD, + GPIO_OSPEED_100MHZ, usart_config.rx.pin); + usart_enable_rx_dma(_usart); + } + + // Config USART + init_uasrt(settings); + + // Enable USART + enable(); +} + +/** + * Enable clock port GPIO + * @param port - port GPIO + */ +void UsartDma::port_config_clock_enable(uint32_t port) const +{ + rcc_periph_clken clken; + if (port == GPIOA) { + clken = RCC_GPIOA; + } + else if (port == GPIOB) { + clken = RCC_GPIOB; + } + else if (port == GPIOC) { + clken = RCC_GPIOC; + } + else if (port == GPIOD) { + clken = RCC_GPIOD; + } + else if (port == GPIOE) { + clken = RCC_GPIOE; + } + else if (port == GPIOF) { + clken = RCC_GPIOF; + } + else if (port == GPIOG) { + clken = RCC_GPIOG; + } + + rcc_periph_clock_enable(clken); +} + +/** + * Config USART + * @param settings - settings for usart + */ +void UsartDma::init_uasrt(const Settings& settings) const +{ + // Setup parameters + usart_set_baudrate(_usart, settings.baud_rate); + usart_set_databits(_usart, settings.word_length); + usart_set_stopbits(_usart, settings.stop_bits); + usart_set_mode(_usart, settings.mode); + usart_set_parity(_usart, settings.parity); + usart_set_flow_control(_usart, settings.flow_control); +} + +/** + * Usart enable + */ +void UsartDma::enable() const +{ + usart_enable(_usart); +} + +/** + * Usart disable + */ +void UsartDma::disable() const +{ + usart_disable(_usart); +} + +/** + * Sending data to USART(not safe) + * @param data - data reference + * @param len - data length + */ +void UsartDma::write(uint8_t& data, uint16_t len) +{ + _dma_tx.set_memory_address((uint32_t)(&data)); + _dma_tx.set_data_counter(len); + + // Enable sending, disable it in the interrupt + _dma_tx.enable_stream(); +} + +} // namespace usart_dma + +} // namespace cm3cpp |