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PSoC6 serial driver: Setup RTS and TX lines on deepsleep entry/exit #10268

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merged 1 commit into from Apr 10, 2019
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PSoC6 serial driver: Setup RTS and TX lines on deepsleep entry/exit #10268

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32 changes: 32 additions & 0 deletions targets/TARGET_Cypress/TARGET_PSOC6/serial_api.c
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Expand Up @@ -34,6 +34,7 @@
#include "cy_scb_uart.h"
#include "cy_sysint.h"
#include "cycfg_pins.h"
#include "cycfg_peripherals.h"

#define UART_OVERSAMPLE 12
#define UART_DEFAULT_BAUDRATE 115200
Expand Down Expand Up @@ -127,6 +128,10 @@ static irq_info_t irq_info[NUM_SERIAL_PORTS] = {
{NULL, NULL, 0, unconnected_IRQn}
};

static uint32_t Cy_SCB_UART_GetRtsAcitvePolarity(CySCB_Type const *base)
{
return _FLD2VAL(SCB_UART_FLOW_CTRL_RTS_POLARITY, SCB_UART_FLOW_CTRL(base));
}

/** Routes interrupt to proper SCB block.
*
Expand Down Expand Up @@ -398,6 +403,8 @@ static cy_en_syspm_status_t serial_pm_callback(cy_stc_syspm_callback_params_t *c
{
serial_obj_t *obj = (serial_obj_t *) callbackParams->context;
cy_en_syspm_status_t status = CY_SYSPM_FAIL;
GPIO_PRT_Type *port_tx = Cy_GPIO_PortToAddr(CY_PORT(obj->pin_tx));
GPIO_PRT_Type *port_rts = Cy_GPIO_PortToAddr(CY_PORT(obj->pin_rts));

switch (mode) {
case CY_SYSPM_CHECK_READY:
Expand All @@ -407,6 +414,17 @@ static cy_en_syspm_status_t serial_pm_callback(cy_stc_syspm_callback_params_t *c
*/
if (Cy_SCB_UART_IsTxComplete(obj->base)) {
if (0 == Cy_SCB_UART_GetNumInRxFifo(obj->base)) {
/* Configure RTS and TX GPIO DR register to drive output (high) */
if(obj->pin_rts != NC) {
uint32_t rts_polarity = Cy_SCB_UART_GetRtsAcitvePolarity(obj->base);
uint32_t rts_value = ((rts_polarity == CY_SCB_UART_ACTIVE_LOW) ? CY_SCB_UART_ACTIVE_HIGH : CY_SCB_UART_ACTIVE_LOW);
Cy_GPIO_Write (port_rts, CY_PIN(obj->pin_rts), rts_value);
Cy_GPIO_SetHSIOM(port_rts, CY_PIN(obj->pin_rts), HSIOM_SEL_GPIO);
}

Cy_GPIO_Write (port_tx, CY_PIN(obj->pin_tx), 1);
Cy_GPIO_SetHSIOM(port_tx, CY_PIN(obj->pin_tx), HSIOM_SEL_GPIO);

/* Disable the UART. The transmitter stops driving the
* lines and the receiver stops receiving data until
* the UART is enabled.
Expand All @@ -422,6 +440,13 @@ static cy_en_syspm_status_t serial_pm_callback(cy_stc_syspm_callback_params_t *c
case CY_SYSPM_CHECK_FAIL:
/* Enable the UART to operate */
Cy_SCB_UART_Enable(obj->base);
/* Return SCB control on TX and RTS output pins */
if(obj->pin_rts != NC) {
Cy_GPIO_SetHSIOM(port_rts, CY_PIN(obj->pin_rts), CY_PIN_HSIOM(pinmap_function(obj->pin_rts, PinMap_UART_RTS)));
}

Cy_GPIO_SetHSIOM(port_tx, CY_PIN(obj->pin_tx), CY_PIN_HSIOM(pinmap_function(obj->pin_tx, PinMap_UART_TX)));

status = CY_SYSPM_SUCCESS;
break;

Expand All @@ -432,6 +457,13 @@ static cy_en_syspm_status_t serial_pm_callback(cy_stc_syspm_callback_params_t *c
case CY_SYSPM_AFTER_TRANSITION:
/* Enable the UART to operate */
Cy_SCB_UART_Enable(obj->base);
/* Return SCB control on TX and RTS output pins */
if(obj->pin_rts != NC) {
Cy_GPIO_SetHSIOM(port_rts, CY_PIN(obj->pin_rts), CY_PIN_HSIOM(pinmap_function(obj->pin_rts, PinMap_UART_RTS)));
}

Cy_GPIO_SetHSIOM(port_tx, CY_PIN(obj->pin_tx), CY_PIN_HSIOM(pinmap_function(obj->pin_tx, PinMap_UART_TX)));

status = CY_SYSPM_SUCCESS;
break;

Expand Down