void HardwareSerialFlowControl::begin(uint32 baud) {
ASSERT(baud <= this->usart_device->max_baud);
if (baud > this->usart_device->max_baud) {
return;
}
const stm32_pin_info *txi = &PIN_MAP[this->tx_pin];
const stm32_pin_info *rxi = &PIN_MAP[this->rx_pin];
//TODO figureout how to extract correct pin from &PIN_MAP[this->rts_pin]
const stm32_pin_info *ctsi = &PIN_MAP[this->cts_pin];
const stm32_pin_info *rtsi = &PIN_MAP[this->rts_pin];
disable_timer_if_necessary(txi->timer_device, txi->timer_channel);
/* Configure USART2 RTS and USART2 Tx as alternate function push-pull */
/* Configure USART2 CTS and USART2 Rx as input floating */
usart_config_gpios_async(this->usart_device,
rxi->gpio_device, rxi->gpio_bit,
txi->gpio_device, txi->gpio_bit,
0);
// need to configure the rts and cts pins here as
// gpio_set_mode(ctsi->gpio_device, ctsi->gpio_bit, GPIO_INPUT_FLOATING);
// gpio_set_mode(rtsi->gpio_device, rtsi->gpio_bit, GPIO_AF_OUTPUT_PP);
// note this would do the same thing but is less explicit
usart_config_gpios_async(this->usart_device,
ctsi->gpio_device, ctsi->gpio_bit,
rtsi->gpio_device, rtsi->gpio_bit,
0);
usart_init(this->usart_device);
usart_enable(this->usart_device);
// enable rts/cts flow control in registers
// should this be in usart.c for libmaple? does this apply to USART1,2..
// The stm peripheral example uses a temporary register (tmpreg) with a clear
// mask and the following defines:
// from stm peripheral library examples:
// #define CR3_CLEAR_Mask ((uint16)0xFCFF) /*!< USART CR3 Mask */
// #define USART_HardwareFlowControl_RTS_CTS ((uint16)0x0300)
// uint16 tmpreg = 0x00;
// tmpreg = this->usart_device->regs->CR3;
// tmpreg &= CR3_CLEAR_Mask;
// tmpreg |= USART_HardwareFlowControl_RTS_CTS;
// USART_HardwareFlowControl_RTS_CTS should be equivalent to
// tmpreg |= (USART_CR3_RTSE |USART_CR3_CTSE );
// this->usart_device->regs->CR3 = tmpreg;
this->usart_device->regs->CR3 = (USART_CR3_RTSE |USART_CR3_CTSE );
usart_set_baud_rate(this->usart_device, USART_USE_PCLK, baud);
}
void HardwareSerial::begin(uint32 baud) {
ASSERT(baud <= this->usart_device->max_baud);
if (baud > this->usart_device->max_baud) {
return;
}
const stm32_pin_info *txi = &PIN_MAP[this->tx_pin];
const stm32_pin_info *rxi = &PIN_MAP[this->rx_pin];
disable_timer_if_necessary(txi->timer_device, txi->timer_channel);
usart_config_gpios_async(this->usart_device,
rxi->gpio_device, rxi->gpio_bit,
txi->gpio_device, txi->gpio_bit,
0);
usart_init(this->usart_device);
usart_set_baud_rate(this->usart_device, USART_USE_PCLK, baud);
usart_enable(this->usart_device);
}
void HardwareSerial::begin(uint32 baud, uint8_t config)
{
// ASSERT(baud <= this->usart_device->max_baud);// Roger Clark. Assert doesn't do anything useful, we may as well save the space in flash and ram etc
if (baud > this->usart_device->max_baud) {
return;
}
const stm32_pin_info *txi = &PIN_MAP[this->tx_pin];
const stm32_pin_info *rxi = &PIN_MAP[this->rx_pin];
disable_timer_if_necessary(txi->timer_device, txi->timer_channel);
usart_init(this->usart_device);
usart_config_gpios_async(this->usart_device,
rxi->gpio_device, rxi->gpio_bit,
txi->gpio_device, txi->gpio_bit,
config);
usart_set_baud_rate(this->usart_device, USART_USE_PCLK, baud);
usart_enable(this->usart_device);
}
