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Fixes to serial_api: 

* Allow pins to be configured as NC without failing or asserting
* Fix putc() to not return before the entire character has been physically shifted out.
* Use MBED_ASSERT
* Fix baudrate calculation to avoid wrong configuration on startup for stdio
pull/1501/head
Steven Cooreman 2016-01-14 16:45:39 +01:00
parent 6ab14faf91
commit 3d8637cdfb
1 changed files with 98 additions and 24 deletions
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122
libraries/mbed/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/serial_api.c
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@ -477,12 +477,21 @@ static void serial_enable_pins(serial_t *obj, uint8_t enable)
{
if (enable) {
/* Configure GPIO pins*/
pin_mode(obj->serial.rx_pin, Input);
/* 0x10 sets DOUT. Prevents false start. */
pin_mode(obj->serial.tx_pin, PushPull | 0x10);
if(obj->serial.rx_pin != NC) {
pin_mode(obj->serial.rx_pin, Input);
}
/* Set DOUT first to prevent glitches */
if(obj->serial.tx_pin != NC) {
GPIO_PinOutSet((GPIO_Port_TypeDef)(obj->serial.tx_pin >> 4 & 0xF), obj->serial.tx_pin & 0xF);
pin_mode(obj->serial.tx_pin, PushPull);
}
} else {
pin_mode(obj->serial.rx_pin, Disabled);
pin_mode(obj->serial.tx_pin, Disabled);
if(obj->serial.rx_pin != NC) {
pin_mode(obj->serial.rx_pin, Disabled);
}
if(obj->serial.tx_pin != NC) {
pin_mode(obj->serial.tx_pin, Disabled);
}
}
}
@ -513,7 +522,7 @@ void serial_init(serial_t *obj, PinName tx, PinName rx)
CMU_ClockEnable(serial_get_clock(obj), true);
/* Limitations of board controller: CDC port only supports 115kbaud */
if((tx == STDIO_UART_TX) && (rx == STDIO_UART_RX)
if(((tx == STDIO_UART_TX) || (rx == STDIO_UART_RX))
&& (obj->serial.periph.uart == (USART_TypeDef*)STDIO_UART )
) {
baudrate = 115200;
@ -528,21 +537,53 @@ void serial_init(serial_t *obj, PinName tx, PinName rx)
/* Enable pins for UART at correct location */
if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
#ifdef _LEUART_ROUTE_LOCATION_SHIFT
obj->serial.periph.leuart->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN | (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
obj->serial.periph.leuart->ROUTE = (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
if(tx != (uint32_t)NC) {
obj->serial.periph.leuart->ROUTE |= LEUART_ROUTE_TXPEN;
}
if(rx != (uint32_t)NC) {
obj->serial.periph.leuart->ROUTE |= LEUART_ROUTE_RXPEN;
}
#else
obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.location_tx << _LEUART_ROUTELOC0_TXLOC_SHIFT) |
(obj->serial.location_rx << _LEUART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.leuart->ROUTEPEN = LEUART_ROUTEPEN_RXPEN | LEUART_ROUTEPEN_TXPEN;
if(obj->serial.location_tx != NC) {
obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.periph.leuart->ROUTELOC0 & (~_LEUART_ROUTELOC0_TXLOC_MASK)) | (obj->serial.location_tx << _LEUART_ROUTELOC0_TXLOC_SHIFT);
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_TXPEN_MASK)) | LEUART_ROUTEPEN_TXPEN;
} else {
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_TXPEN_MASK));
}
if(obj->serial.location_rx != NC) {
obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.periph.leuart->ROUTELOC0 & (~_LEUART_ROUTELOC0_RXLOC_MASK)) | (obj->serial.location_rx << _LEUART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_RXPEN_MASK)) | LEUART_ROUTEPEN_RXPEN;
} else {
obj->serial.periph.leuart->CMD = LEUART_CMD_RXBLOCKEN;
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_RXPEN_MASK));
}
#endif
obj->serial.periph.leuart->IFC = LEUART_IFC_TXC;
obj->serial.periph.leuart->CTRL |= LEUART_CTRL_RXDMAWU | LEUART_CTRL_TXDMAWU;
} else {
#ifdef _USART_ROUTE_LOCATION_SHIFT
obj->serial.periph.uart->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (obj->serial.location << _USART_ROUTE_LOCATION_SHIFT);
obj->serial.periph.uart->ROUTE = (obj->serial.location << _USART_ROUTE_LOCATION_SHIFT);
if(tx != (uint32_t)NC) {
obj->serial.periph.uart->ROUTE |= USART_ROUTE_TXPEN;
}
if(rx != (uint32_t)NC) {
obj->serial.periph.uart->ROUTE |= USART_ROUTE_RXPEN;
}
#else
obj->serial.periph.uart->ROUTELOC0 = (obj->serial.location_tx << _USART_ROUTELOC0_TXLOC_SHIFT) |
(obj->serial.location_rx << _USART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.uart->ROUTEPEN = USART_ROUTEPEN_RXPEN | USART_ROUTEPEN_TXPEN;
if(obj->serial.location_tx != NC) {
obj->serial.periph.uart->ROUTELOC0 = (obj->serial.periph.uart->ROUTELOC0 & (~_USART_ROUTELOC0_TXLOC_MASK)) | (obj->serial.location_tx << _USART_ROUTELOC0_TXLOC_SHIFT);
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_TXPEN_MASK)) | USART_ROUTEPEN_TXPEN;
} else {
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_TXPEN_MASK));
}
if(obj->serial.location_rx != NC) {
obj->serial.periph.uart->ROUTELOC0 = (obj->serial.periph.uart->ROUTELOC0 & (~_USART_ROUTELOC0_RXLOC_MASK)) | (obj->serial.location_rx << _USART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_RXPEN_MASK)) | USART_ROUTEPEN_RXPEN;
} else {
obj->serial.periph.uart->CMD = USART_CMD_RXBLOCKEN;
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_RXPEN_MASK));
}
#endif
obj->serial.periph.uart->IFC = USART_IFC_TXC;
}
@ -571,6 +612,7 @@ void serial_free(serial_t *obj)
} else {
USART_Enable(obj->serial.periph.uart, usartDisable);
}
serial_enable_pins(obj, false);
}
static void serial_enable(serial_t *obj, uint8_t enable)
@ -599,7 +641,7 @@ void serial_baud(serial_t *obj, int baudrate)
if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
serial_leuart_baud(obj, baudrate);
} else {
USART_BaudrateAsyncSet(obj->serial.periph.uart, 0, (uint32_t)baudrate, usartOVS16);
USART_BaudrateAsyncSet(obj->serial.periph.uart, REFERENCE_FREQUENCY, (uint32_t)baudrate, usartOVS16);
}
}
@ -720,11 +762,26 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
/* Re-enable pins for UART at correct location */
#ifdef _LEUART_ROUTE_LOCATION_SHIFT
obj->serial.periph.leuart->ROUTE = LEUART_ROUTE_RXPEN | LEUART_ROUTE_TXPEN | (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
obj->serial.periph.leuart->ROUTE = (obj->serial.location << _LEUART_ROUTE_LOCATION_SHIFT);
if(obj->serial.tx_pin != (uint32_t)NC) {
obj->serial.periph.leuart->ROUTE |= LEUART_ROUTE_TXPEN;
}
if(obj->serial.rx_pin != (uint32_t)NC) {
obj->serial.periph.leuart->ROUTE |= LEUART_ROUTE_RXPEN;
}
#else
obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.location_tx << _LEUART_ROUTELOC0_TXLOC_SHIFT) |
(obj->serial.location_rx << _LEUART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.leuart->ROUTEPEN = LEUART_ROUTEPEN_RXPEN | LEUART_ROUTEPEN_TXPEN;
if(obj->serial.location_tx != NC) {
obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.periph.leuart->ROUTELOC0 & (~_LEUART_ROUTELOC0_TXLOC_MASK)) | (obj->serial.location_tx << _LEUART_ROUTELOC0_TXLOC_SHIFT);
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_TXPEN_MASK)) | LEUART_ROUTEPEN_TXPEN;
} else {
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_TXPEN_MASK));
}
if(obj->serial.location_rx != NC) {
obj->serial.periph.leuart->ROUTELOC0 = (obj->serial.periph.leuart->ROUTELOC0 & (~_LEUART_ROUTELOC0_RXLOC_MASK)) | (obj->serial.location_rx << _LEUART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_RXPEN_MASK)) | LEUART_ROUTEPEN_RXPEN;
} else {
obj->serial.periph.leuart->ROUTEPEN = (obj->serial.periph.leuart->ROUTEPEN & (~_LEUART_ROUTEPEN_RXPEN_MASK));
}
#endif
/* Re-enable interrupts */
@ -771,11 +828,26 @@ void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_b
/* Re-enable pins for UART at correct location */
#ifdef _USART_ROUTE_LOCATION_SHIFT
obj->serial.periph.uart->ROUTE = USART_ROUTE_RXPEN | USART_ROUTE_TXPEN | (obj->serial.location << _USART_ROUTE_LOCATION_SHIFT);
obj->serial.periph.uart->ROUTE = (obj->serial.location << _USART_ROUTE_LOCATION_SHIFT);
if(obj->serial.tx_pin != (uint32_t)NC) {
obj->serial.periph.uart->ROUTE |= USART_ROUTE_TXPEN;
}
if(obj->serial.rx_pin != (uint32_t)NC) {
obj->serial.periph.uart->ROUTE |= USART_ROUTE_RXPEN;
}
#else
obj->serial.periph.uart->ROUTELOC0 = (obj->serial.location_tx << _USART_ROUTELOC0_TXLOC_SHIFT) |
(obj->serial.location_rx << _USART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.uart->ROUTEPEN = USART_ROUTEPEN_RXPEN | USART_ROUTEPEN_TXPEN;
if(obj->serial.location_tx != NC) {
obj->serial.periph.uart->ROUTELOC0 = (obj->serial.periph.uart->ROUTELOC0 & (~_USART_ROUTELOC0_TXLOC_MASK)) | (obj->serial.location_tx << _USART_ROUTELOC0_TXLOC_SHIFT);
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_TXPEN_MASK)) | USART_ROUTEPEN_TXPEN;
} else {
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_TXPEN_MASK));
}
if(obj->serial.location_rx != NC) {
obj->serial.periph.uart->ROUTELOC0 = (obj->serial.periph.uart->ROUTELOC0 & (~_USART_ROUTELOC0_RXLOC_MASK)) | (obj->serial.location_rx << _USART_ROUTELOC0_RXLOC_SHIFT);
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_RXPEN_MASK)) | USART_ROUTEPEN_RXPEN;
} else {
obj->serial.periph.uart->ROUTEPEN = (obj->serial.periph.uart->ROUTEPEN & (~_USART_ROUTEPEN_RXPEN_MASK));
}
#endif
/* Re-enable interrupts */
@ -997,8 +1069,10 @@ void serial_putc(serial_t *obj, int c)
* need to use serial_writable(). */
if(LEUART_REF_VALID(obj->serial.periph.leuart)) {
LEUART_Tx(obj->serial.periph.leuart, (uint8_t)(c));
while (!(obj->serial.periph.leuart->STATUS & LEUART_STATUS_TXC));
} else {
USART_Tx(obj->serial.periph.uart, (uint8_t)(c));
while (!(obj->serial.periph.uart->STATUS & USART_STATUS_TXC));
}
}
@ -1418,7 +1492,7 @@ static void serial_dmaActivate(serial_t *obj, void* cb, void* buffer, int length
break;
#endif
default:
EFM_ASSERT(0);
MBED_ASSERT(0);
while(1);
break;
}