void serial_init(serial_t *obj, PinName tx, PinName rx)
{
// Determine the UART to use (UART_1, UART_2, ...)
UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
// Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object
obj->uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
MBED_ASSERT(obj->uart != (UARTName)NC);
// Enable USART clock
switch (obj->uart) {
case UART_1:
__USART1_CLK_ENABLE();
obj->index = 0;
break;
case UART_2:
__USART2_CLK_ENABLE();
obj->index = 1;
break;
#if defined(USART3_BASE)
case UART_3:
__USART3_CLK_ENABLE();
obj->index = 2;
break;
#endif
#if defined(UART4_BASE)
case UART_4:
__UART4_CLK_ENABLE();
obj->index = 3;
break;
#endif
#if defined(UART5_BASE)
case UART_5:
__UART5_CLK_ENABLE();
obj->index = 4;
break;
#endif
case UART_6:
__USART6_CLK_ENABLE();
obj->index = 5;
break;
#if defined(UART7_BASE)
case UART_7:
__UART7_CLK_ENABLE();
obj->index = 6;
break;
#endif
#if defined(UART8_BASE)
case UART_8:
__UART8_CLK_ENABLE();
obj->index = 7;
break;
#endif
}
// Configure the UART pins
pinmap_pinout(tx, PinMap_UART_TX);
pinmap_pinout(rx, PinMap_UART_RX);
if (tx != NC) {
pin_mode(tx, PullUp);
}
if (rx != NC) {
pin_mode(rx, PullUp);
}
// Configure UART
obj->baudrate = 9600;
obj->databits = UART_WORDLENGTH_8B;
obj->stopbits = UART_STOPBITS_1;
obj->parity = UART_PARITY_NONE;
obj->pin_tx = tx;
obj->pin_rx = rx;
init_uart(obj);
// For stdio management
if (obj->uart == STDIO_UART) {
stdio_uart_inited = 1;
memcpy(&stdio_uart, obj, sizeof(serial_t));
}
}
// assumes Init parameters have been set up correctly
STATIC bool uart_init2(pyb_uart_obj_t *uart_obj) {
USART_TypeDef *UARTx;
IRQn_Type irqn;
int uart_unit;
const pin_obj_t *pins[4] = {0};
switch (uart_obj->uart_id) {
#if defined(MICROPY_HW_UART1_TX) && defined(MICROPY_HW_UART1_RX)
case PYB_UART_1:
uart_unit = 1;
UARTx = USART1;
irqn = USART1_IRQn;
pins[0] = &MICROPY_HW_UART1_TX;
pins[1] = &MICROPY_HW_UART1_RX;
__USART1_CLK_ENABLE();
break;
#endif
#if defined(MICROPY_HW_UART2_TX) && defined(MICROPY_HW_UART2_RX)
case PYB_UART_2:
uart_unit = 2;
UARTx = USART2;
irqn = USART2_IRQn;
pins[0] = &MICROPY_HW_UART2_TX;
pins[1] = &MICROPY_HW_UART2_RX;
#if defined(MICROPY_HW_UART2_RTS)
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_RTS) {
pins[2] = &MICROPY_HW_UART2_RTS;
}
#endif
#if defined(MICROPY_HW_UART2_CTS)
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_CTS) {
pins[3] = &MICROPY_HW_UART2_CTS;
}
#endif
__USART2_CLK_ENABLE();
break;
#endif
#if defined(MICROPY_HW_UART3_TX) && defined(MICROPY_HW_UART3_RX)
case PYB_UART_3:
uart_unit = 3;
UARTx = USART3;
irqn = USART3_IRQn;
pins[0] = &MICROPY_HW_UART3_TX;
pins[1] = &MICROPY_HW_UART3_RX;
#if defined(MICROPY_HW_UART3_RTS)
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_RTS) {
pins[2] = &MICROPY_HW_UART3_RTS;
}
#endif
#if defined(MICROPY_HW_UART3_CTS)
if (uart_obj->uart.Init.HwFlowCtl & UART_HWCONTROL_CTS) {
pins[3] = &MICROPY_HW_UART3_CTS;
}
#endif
__USART3_CLK_ENABLE();
break;
#endif
#if defined(MICROPY_HW_UART4_TX) && defined(MICROPY_HW_UART4_RX)
case PYB_UART_4:
uart_unit = 4;
UARTx = UART4;
irqn = UART4_IRQn;
pins[0] = &MICROPY_HW_UART4_TX;
pins[1] = &MICROPY_HW_UART4_RX;
__UART4_CLK_ENABLE();
break;
#endif
#if defined(MICROPY_HW_UART5_TX) && defined(MICROPY_HW_UART5_RX)
case PYB_UART_5:
uart_unit = 5;
UARTx = UART5;
irqn = UART5_IRQn;
pins[0] = &MICROPY_HW_UART5_TX;
pins[1] = &MICROPY_HW_UART5_RX;
__UART5_CLK_ENABLE();
break;
#endif
#if defined(MICROPY_HW_UART6_TX) && defined(MICROPY_HW_UART6_RX)
case PYB_UART_6:
uart_unit = 6;
UARTx = USART6;
irqn = USART6_IRQn;
pins[0] = &MICROPY_HW_UART6_TX;
pins[1] = &MICROPY_HW_UART6_RX;
__USART6_CLK_ENABLE();
break;
#endif
#if defined(MICROPY_HW_UART7_TX) && defined(MICROPY_HW_UART7_RX)
case PYB_UART_7:
uart_unit = 7;
UARTx = UART7;
irqn = UART7_IRQn;
pins[0] = &MICROPY_HW_UART7_TX;
pins[1] = &MICROPY_HW_UART7_RX;
__UART7_CLK_ENABLE();
break;
#endif
#if defined(MICROPY_HW_UART8_TX) && defined(MICROPY_HW_UART8_RX)
case PYB_UART_8:
uart_unit = 8;
UARTx = UART8;
irqn = UART8_IRQn;
pins[0] = &MICROPY_HW_UART8_TX;
pins[1] = &MICROPY_HW_UART8_RX;
__UART8_CLK_ENABLE();
break;
#endif
default:
// UART does not exist or is not configured for this board
return false;
}
uint32_t mode = MP_HAL_PIN_MODE_ALT;
uint32_t pull = MP_HAL_PIN_PULL_UP;
for (uint i = 0; i < 4; i++) {
if (pins[i] != NULL) {
bool ret = mp_hal_pin_config_alt(pins[i], mode, pull, AF_FN_UART, uart_unit);
if (!ret) {
return false;
}
}
}
uart_obj->irqn = irqn;
uart_obj->uart.Instance = UARTx;
// init UARTx
HAL_UART_Init(&uart_obj->uart);
uart_obj->is_enabled = true;
return true;
}
void serial_init(serial_t *obj, PinName tx, PinName rx)
{
// Determine the UART to use (UART_1, UART_2, ...)
UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
// Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object
UARTName instance = (UARTName)pinmap_merge(uart_tx, uart_rx);
MBED_ASSERT(instance != (UARTName)NC);
// Enable USART clock
switch (instance) {
case UART_1:
__USART1_CLK_ENABLE();
obj->serial.module = 0;
break;
case UART_2:
__USART2_CLK_ENABLE();
obj->serial.module = 1;
break;
#if defined(USART3_BASE)
case UART_3:
__USART3_CLK_ENABLE();
obj->serial.module = 2;
break;
#endif
#if defined(UART4_BASE)
case UART_4:
__UART4_CLK_ENABLE();
obj->serial.module = 3;
break;
#endif
#if defined(UART5_BASE)
case UART_5:
__UART5_CLK_ENABLE();
obj->serial.module = 4;
break;
#endif
case UART_6:
__USART6_CLK_ENABLE();
obj->serial.module = 5;
break;
#if defined(UART7_BASE)
case UART_7:
__UART7_CLK_ENABLE();
obj->serial.module = 6;
break;
#endif
#if defined(UART8_BASE)
case UART_8:
__UART8_CLK_ENABLE();
obj->serial.module = 7;
break;
#endif
}
// Configure the UART pins
pinmap_pinout(tx, PinMap_UART_TX);
pinmap_pinout(rx, PinMap_UART_RX);
if (tx != NC) pin_mode(tx, PullUp);
if (rx != NC) pin_mode(rx, PullUp);
obj->serial.pin_tx = tx;
obj->serial.pin_rx = rx;
// initialize the handle for this master!
UART_HandleTypeDef *handle = &UartHandle[obj->serial.module];
handle->Instance = (USART_TypeDef *)instance;
handle->Init.BaudRate = 9600;
handle->Init.WordLength = UART_WORDLENGTH_8B;
handle->Init.StopBits = UART_STOPBITS_1;
handle->Init.Parity = UART_PARITY_NONE;
if (rx == NC) {
handle->Init.Mode = UART_MODE_TX;
} else if (tx == NC) {
handle->Init.Mode = UART_MODE_RX;
} else {
handle->Init.Mode = UART_MODE_TX_RX;
}
handle->Init.HwFlowCtl = UART_HWCONTROL_NONE;
handle->Init.OverSampling = UART_OVERSAMPLING_16;
handle->TxXferCount = 0;
handle->RxXferCount = 0;
if (tx == STDIO_UART_TX && rx == STDIO_UART_RX) {
handle->Init.BaudRate = YOTTA_CFG_MBED_OS_STDIO_DEFAULT_BAUD;
}
HAL_UART_Init(handle);
// DEBUG_PRINTF("UART%u: Init\n", obj->serial.module+1);
}
