kopia lustrzana https://github.com/micropython/micropython
samd/machine_uart: Add machine_uart_set_baudrate() function.
Changing the baudrate requires a complete re-configuration of the Sercom device, which is put into a separate rather large function. This new machine_uart_set_baudrate() function will be useful for future drivers such as Bluetooth. Signed-off-by: robert-hh <robert@hammelrath.com>pull/12886/head
robert-hh
Damien George
rodzic
2c1f238205
commit
59afeb056a
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@ -49,6 +49,7 @@ typedef struct _machine_uart_obj_t {
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uint8_t bits;
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uint8_t parity;
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uint8_t stop;
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uint8_t flow_control;
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uint8_t tx;
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uint8_t rx;
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sercom_pad_config_t tx_pad_config;
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@ -112,6 +113,85 @@ void common_uart_irq_handler(int uart_id) {
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}
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}
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// Configure the Sercom device
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STATIC void machine_sercom_configure(machine_uart_obj_t *self) {
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Sercom *uart = sercom_instance[self->id];
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// Reset (clear) the peripheral registers.
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while (uart->USART.SYNCBUSY.bit.SWRST) {
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}
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uart->USART.CTRLA.bit.SWRST = 1; // Reset all Registers, disable peripheral
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while (uart->USART.SYNCBUSY.bit.SWRST) {
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}
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uint8_t txpo = self->tx_pad_config.pad_nr;
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#if defined(MCU_SAMD21)
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if (self->tx_pad_config.pad_nr == 2) { // Map pad 2 to TXPO = 1
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txpo = 1;
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} else
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#endif
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if (self->tx_pad_config.pad_nr != 0) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid UART pin"));
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}
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#if MICROPY_HW_UART_RTSCTS
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if ((self->flow_control & FLOW_CONTROL_RTS) && self->rts_pad_config.pad_nr == 2) {
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txpo = 2;
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mp_hal_set_pin_mux(self->rts, self->rts_pad_config.alt_fct);
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}
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if ((self->flow_control & FLOW_CONTROL_CTS) && self->cts_pad_config.pad_nr == 3) {
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txpo = 2;
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mp_hal_set_pin_mux(self->cts, self->cts_pad_config.alt_fct);
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}
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#endif
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uart->USART.CTRLA.reg =
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SERCOM_USART_CTRLA_DORD // Data order
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| SERCOM_USART_CTRLA_FORM(self->parity != 0 ? 1 : 0) // Enable parity or not
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| SERCOM_USART_CTRLA_RXPO(self->rx_pad_config.pad_nr) // Set Pad#
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| SERCOM_USART_CTRLA_TXPO(txpo) // Set Pad#
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| SERCOM_USART_CTRLA_MODE(1) // USART with internal clock
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;
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uart->USART.CTRLB.reg =
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SERCOM_USART_CTRLB_RXEN // Enable Rx & Tx
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| SERCOM_USART_CTRLB_TXEN
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| ((self->parity & 1) << SERCOM_USART_CTRLB_PMODE_Pos)
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| (self->stop << SERCOM_USART_CTRLB_SBMODE_Pos)
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| SERCOM_USART_CTRLB_CHSIZE((self->bits & 7) | (self->bits & 1))
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;
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while (uart->USART.SYNCBUSY.bit.CTRLB) {
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}
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// USART is driven by the clock of GCLK Generator 2, freq by get_peripheral_freq()
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// baud rate; 65536 * (1 - 16 * 115200/bus_freq)
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uint32_t baud = 65536 - ((uint64_t)(65536 * 16) * self->baudrate + get_peripheral_freq() / 2) / get_peripheral_freq();
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uart->USART.BAUD.bit.BAUD = baud; // Set Baud
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sercom_register_irq(self->id, &common_uart_irq_handler);
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// Enable RXC interrupt
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uart->USART.INTENSET.reg = SERCOM_USART_INTENSET_RXC;
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#if defined(MCU_SAMD21)
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NVIC_EnableIRQ(SERCOM0_IRQn + self->id);
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#elif defined(MCU_SAMD51)
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NVIC_EnableIRQ(SERCOM0_0_IRQn + 4 * self->id + 2);
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#endif
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#if MICROPY_HW_UART_TXBUF
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// Enable DRE interrupt
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// SAMD21 has just 1 IRQ for all USART events, so no need for an additional NVIC enable
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#if defined(MCU_SAMD51)
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NVIC_EnableIRQ(SERCOM0_0_IRQn + 4 * self->id + 0);
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#endif
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#endif
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sercom_enable(uart, 1);
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}
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void machine_uart_set_baudrate(mp_obj_t self_in, uint32_t baudrate) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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self->baudrate = baudrate;
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machine_sercom_configure(self);
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}
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STATIC void mp_machine_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_uart_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "UART(%u, baudrate=%u, bits=%u, parity=%s, stop=%u, "
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@ -194,22 +274,22 @@ STATIC void mp_machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args,
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if (args[ARG_rx].u_obj != mp_const_none) {
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self->rx = mp_hal_get_pin_obj(args[ARG_rx].u_obj);
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}
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self->flow_control = 0;
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#if MICROPY_HW_UART_RTSCTS
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uint8_t flow_control = 0;
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// Set RTS/CTS pins if configured.
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if (args[ARG_rts].u_obj != mp_const_none) {
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self->rts = mp_hal_get_pin_obj(args[ARG_rts].u_obj);
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self->rts_pad_config = get_sercom_config(self->rts, self->id);
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flow_control = FLOW_CONTROL_RTS;
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self->flow_control = FLOW_CONTROL_RTS;
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}
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if (args[ARG_cts].u_obj != mp_const_none) {
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self->cts = mp_hal_get_pin_obj(args[ARG_cts].u_obj);
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self->cts_pad_config = get_sercom_config(self->cts, self->id);
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flow_control |= FLOW_CONTROL_CTS;
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self->flow_control |= FLOW_CONTROL_CTS;
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}
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// rts only flow control is not allowed. Otherwise the state of the
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// cts pin is undefined.
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if (flow_control == FLOW_CONTROL_RTS) {
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if (self->flow_control == FLOW_CONTROL_RTS) {
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mp_raise_ValueError(MP_ERROR_TEXT("cts missing for flow control"));
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}
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#endif
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@ -278,75 +358,8 @@ STATIC void mp_machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args,
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// Next: Set up the clocks
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enable_sercom_clock(self->id);
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// Next: Configure the USART
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Sercom *uart = sercom_instance[self->id];
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// Reset (clear) the peripheral registers.
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while (uart->USART.SYNCBUSY.bit.SWRST) {
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}
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uart->USART.CTRLA.bit.SWRST = 1; // Reset all Registers, disable peripheral
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while (uart->USART.SYNCBUSY.bit.SWRST) {
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}
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uint8_t txpo = self->tx_pad_config.pad_nr;
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#if defined(MCU_SAMD21)
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if (self->tx_pad_config.pad_nr == 2) { // Map pad 2 to TXPO = 1
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txpo = 1;
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} else
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#endif
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if (self->tx_pad_config.pad_nr != 0) {
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mp_raise_ValueError(MP_ERROR_TEXT("invalid UART pin"));
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}
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#if MICROPY_HW_UART_RTSCTS
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if ((flow_control & FLOW_CONTROL_RTS) && self->rts_pad_config.pad_nr == 2) {
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txpo = 2;
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mp_hal_set_pin_mux(self->rts, self->rts_pad_config.alt_fct);
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}
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if ((flow_control & FLOW_CONTROL_CTS) && self->cts_pad_config.pad_nr == 3) {
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txpo = 2;
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mp_hal_set_pin_mux(self->cts, self->cts_pad_config.alt_fct);
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}
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#endif
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uart->USART.CTRLA.reg =
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SERCOM_USART_CTRLA_DORD // Data order
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| SERCOM_USART_CTRLA_FORM(self->parity != 0 ? 1 : 0) // Enable parity or not
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| SERCOM_USART_CTRLA_RXPO(self->rx_pad_config.pad_nr) // Set Pad#
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| SERCOM_USART_CTRLA_TXPO(txpo) // Set Pad#
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| SERCOM_USART_CTRLA_MODE(1) // USART with internal clock
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;
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uart->USART.CTRLB.reg =
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SERCOM_USART_CTRLB_RXEN // Enable Rx & Tx
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| SERCOM_USART_CTRLB_TXEN
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| ((self->parity & 1) << SERCOM_USART_CTRLB_PMODE_Pos)
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| (self->stop << SERCOM_USART_CTRLB_SBMODE_Pos)
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| SERCOM_USART_CTRLB_CHSIZE((self->bits & 7) | (self->bits & 1))
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;
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while (uart->USART.SYNCBUSY.bit.CTRLB) {
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}
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// USART is driven by the clock of GCLK Generator 2, freq by get_peripheral_freq()
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// baud rate; 65536 * (1 - 16 * 115200/bus_freq)
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uint32_t baud = 65536 - ((uint64_t)(65536 * 16) * self->baudrate + get_peripheral_freq() / 2) / get_peripheral_freq();
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uart->USART.BAUD.bit.BAUD = baud; // Set Baud
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sercom_register_irq(self->id, &common_uart_irq_handler);
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// Enable RXC interrupt
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uart->USART.INTENSET.reg = SERCOM_USART_INTENSET_RXC;
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#if defined(MCU_SAMD21)
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NVIC_EnableIRQ(SERCOM0_IRQn + self->id);
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#elif defined(MCU_SAMD51)
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NVIC_EnableIRQ(SERCOM0_0_IRQn + 4 * self->id + 2);
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#endif
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#if MICROPY_HW_UART_TXBUF
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// Enable DRE interrupt
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// SAMD21 has just 1 IRQ for all USART events, so no need for an additional NVIC enable
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#if defined(MCU_SAMD51)
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NVIC_EnableIRQ(SERCOM0_0_IRQn + 4 * self->id + 0);
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#endif
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#endif
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sercom_enable(uart, 1);
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// Configure the sercom module
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machine_sercom_configure(self);
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}
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}
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