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LPC55S69: Add support for UART hardware flow control #10509

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merged 1 commit into from May 3, 2019
Merged

LPC55S69: Add support for UART hardware flow control #10509

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43 changes: 43 additions & 0 deletions targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC/serial_api.c
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Expand Up @@ -28,6 +28,7 @@
#include "fsl_usart.h"
#include "PeripheralPins.h"
#include "clock_config.h"
#include "gpio_api.h"

static uint32_t serial_irq_ids[FSL_FEATURE_SOC_USART_COUNT] = {0};
static uart_irq_handler irq_handler;
Expand Down Expand Up @@ -381,6 +382,48 @@ void serial_break_clear(serial_t *obj)
uart_addrs[obj->index]->CTL &= ~USART_CTL_TXBRKEN_MASK;
}

#if DEVICE_SERIAL_FC
/*
* Only hardware flow control is implemented in this API.
*/
void serial_set_flow_control(serial_t *obj, FlowControl type, PinName rxflow, PinName txflow)
{
gpio_t gpio;

switch(type) {
case FlowControlRTS:
pinmap_pinout(rxflow, PinMap_UART_RTS);
uart_addrs[obj->index]->CFG &= ~USART_CFG_CTSEN_MASK;
break;

case FlowControlCTS:
/* Do not use RTS, configure pin to GPIO input */
gpio_init(&gpio, rxflow);
gpio_dir(&gpio, PIN_INPUT);

pinmap_pinout(txflow, PinMap_UART_CTS);
uart_addrs[obj->index]->CFG |= USART_CFG_CTSEN_MASK;
break;

case FlowControlRTSCTS:
pinmap_pinout(rxflow, PinMap_UART_RTS);
pinmap_pinout(txflow, PinMap_UART_CTS);
uart_addrs[obj->index]->CFG |= USART_CFG_CTSEN_MASK;
break;

case FlowControlNone:
/* Do not use RTS, configure pin to GPIO input */
gpio_init(&gpio, rxflow);
gpio_dir(&gpio, PIN_INPUT);

uart_addrs[obj->index]->CFG &= ~USART_CFG_CTSEN_MASK;
break;

default:
break;
}
}
#endif
const PinMap *serial_tx_pinmap()
{
return PinMap_UART_TX;
Expand Down
6 changes: 6 additions & 0 deletions targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_LPCXpresso/PeripheralPins.c
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Expand Up @@ -65,21 +65,27 @@ const PinMap PinMap_I2C_SCL[] = {
/************UART***************/
const PinMap PinMap_UART_TX[] = {
{P0_30, UART_0, 1},
{P1_6, UART_0, 1},
{P0_27, UART_1, 1},
{NC , NC , 0}
};

const PinMap PinMap_UART_RX[] = {
{P0_29, UART_0, 1},
{P1_5, UART_0, 1},
{P1_24, UART_1, 1},
{NC , NC , 0}
};

const PinMap PinMap_UART_CTS[] = {
{P1_8, UART_0, 1},
{P1_26, UART_1, 1},
{NC , NC , 0}
};

const PinMap PinMap_UART_RTS[] = {
{P1_7, UART_0, 1},
{P1_27, UART_1, 1},
{NC , NC , 0}
};

Expand Down
1 change: 1 addition & 0 deletions targets/targets.json
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Expand Up @@ -2088,6 +2088,7 @@
"PORTINOUT",
"PORTOUT",
"SERIAL",
"SERIAL_FC",
"SLEEP",
"SPI",
"SPISLAVE",
Expand Down