static void usartConfigurePinInversion(uartPort_t *uartPort) {
#if !defined(INVERTER) && !defined(STM32F303xC)
UNUSED(uartPort);
#else
bool inverted = uartPort->port.options & SERIAL_INVERTED;
#ifdef INVERTER
if (inverted && uartPort->USARTx == INVERTER_USART) {
// Enable hardware inverter if available.
INVERTER_ON;
}
#endif
#ifdef STM32F303xC
uint32_t inversionPins = 0;
if (uartPort->port.mode & MODE_TX) {
inversionPins |= USART_InvPin_Tx;
}
if (uartPort->port.mode & MODE_RX) {
inversionPins |= USART_InvPin_Rx;
}
USART_InvPinCmd(uartPort->USARTx, inversionPins, inverted ? ENABLE : DISABLE);
#endif
#endif
}
static void usartConfigurePinInversion(uartPort_t *uartPort) {
#if !defined(INVERTER) && !defined(STM32F303xC)
UNUSED(uartPort);
#endif
#ifdef INVERTER
if (uartPort->port.inversion == SERIAL_INVERTED && uartPort->USARTx == INVERTER_USART) {
// Enable hardware inverter if available.
INVERTER_ON;
}
#endif
#ifdef STM32F303xC
uint32_t inversionPins = 0;
if (uartPort->port.mode & MODE_TX) {
inversionPins |= USART_InvPin_Tx;
}
if (uartPort->port.mode & MODE_RX) {
inversionPins |= USART_InvPin_Rx;
}
// Note: inversion when using MODE_BIDIR not supported yet.
USART_InvPinCmd(uartPort->USARTx, inversionPins, uartPort->port.inversion == SERIAL_INVERTED ? ENABLE : DISABLE);
#endif
}
/**
* Initialise a single USART device
*/
int32_t PIOS_USART_Init(uintptr_t * usart_id, const struct pios_usart_cfg * cfg)
{
PIOS_DEBUG_Assert(usart_id);
PIOS_DEBUG_Assert(cfg);
struct pios_usart_dev * usart_dev;
usart_dev = (struct pios_usart_dev *) PIOS_USART_alloc();
if (!usart_dev) goto out_fail;
/* Bind the configuration to the device instance */
usart_dev->cfg = cfg;
/* Map pins to USART function */
if (usart_dev->cfg->remap) {
if (usart_dev->cfg->rx.gpio != 0)
GPIO_PinAFConfig(usart_dev->cfg->rx.gpio,
usart_dev->cfg->rx.pin_source,
usart_dev->cfg->remap);
if (usart_dev->cfg->tx.gpio != 0)
GPIO_PinAFConfig(usart_dev->cfg->tx.gpio,
usart_dev->cfg->tx.pin_source,
usart_dev->cfg->remap);
}
/* Initialize the USART Rx and Tx pins */
if (usart_dev->cfg->rx.gpio != 0)
GPIO_Init(usart_dev->cfg->rx.gpio, (GPIO_InitTypeDef *)&usart_dev->cfg->rx.init);
if (usart_dev->cfg->tx.gpio != 0)
GPIO_Init(usart_dev->cfg->tx.gpio, (GPIO_InitTypeDef *)&usart_dev->cfg->tx.init);
/* Apply inversion and swap settings */
if (usart_dev->cfg->rx_invert == true)
USART_InvPinCmd(usart_dev->cfg->regs, USART_InvPin_Rx, ENABLE);
else
USART_InvPinCmd(usart_dev->cfg->regs, USART_InvPin_Rx, DISABLE);
if (usart_dev->cfg->tx_invert == true)
USART_InvPinCmd(usart_dev->cfg->regs, USART_InvPin_Tx, ENABLE);
else
USART_InvPinCmd(usart_dev->cfg->regs, USART_InvPin_Tx, DISABLE);
if (usart_dev->cfg->rxtx_swap == true)
USART_SWAPPinCmd(usart_dev->cfg->regs, ENABLE);
else
USART_SWAPPinCmd(usart_dev->cfg->regs, DISABLE);
if (usart_dev->cfg->single_wire == true)
USART_HalfDuplexCmd(usart_dev->cfg->regs, ENABLE);
else
USART_HalfDuplexCmd(usart_dev->cfg->regs, DISABLE);
/* Configure the USART */
USART_Init(usart_dev->cfg->regs, (USART_InitTypeDef *)&usart_dev->cfg->init);
*usart_id = (uintptr_t)usart_dev;
/* Configure USART Interrupts */
switch ((uint32_t)usart_dev->cfg->regs) {
case (uint32_t)USART1:
PIOS_USART_1_id = (uintptr_t)usart_dev;
break;
case (uint32_t)USART2:
PIOS_USART_2_id = (uintptr_t)usart_dev;
break;
case (uint32_t)USART3:
PIOS_USART_3_id = (uintptr_t)usart_dev;
break;
case (uint32_t)UART4:
PIOS_UART_4_id = (uintptr_t)usart_dev;
break;
case (uint32_t)UART5:
PIOS_UART_5_id = (uintptr_t)usart_dev;
break;
}
NVIC_Init((NVIC_InitTypeDef *)&(usart_dev->cfg->irq.init));
USART_ITConfig(usart_dev->cfg->regs, USART_IT_RXNE, ENABLE);
USART_ITConfig(usart_dev->cfg->regs, USART_IT_TXE, ENABLE);
// FIXME XXX Clear / reset uart here - sends NUL char else
/* Enable USART */
USART_Cmd(usart_dev->cfg->regs, ENABLE);
return(0);
out_fail:
return(-1);
}
