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mbed-os/targets/TARGET_ARM_SSG/TARGET_BEETLE/serial_api.c

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/* mbed Microcontroller Library
* Copyright (c) 2015 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// math.h required for floating point operations for baud rate calculation
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "serial_api.h"
#include "cmsis.h"
#include "pinmap.h"
#include "PinNames.h"
#include "mbed_error.h"
#include "gpio_api.h"
/******************************************************************************
* INITIALIZATION
******************************************************************************/
static const PinMap PinMap_UART_TX[] = {
{UART_TX0, UART_0, 0},
{UART_TX1, UART_1, 0},
{NC, NC, 0}
};
static const PinMap PinMap_UART_RX[] = {
{UART_RX0, UART_0, 0},
{UART_RX1, UART_1, 0},
{NC, NC, 0}
};
#define UART_NUM 2
static uart_irq_handler irq_handler;
int stdio_uart_inited = 0;
serial_t stdio_uart;
struct serial_global_data_s {
uint32_t serial_irq_id;
gpio_t sw_rts, sw_cts;
uint8_t count, rx_irq_set_flow, rx_irq_set_api;
};
static struct serial_global_data_s uart_data[UART_NUM];
void serial_init(serial_t *obj, PinName tx, PinName rx) {
int is_stdio_uart = 0;
// determine the UART to use
UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
UARTName uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
if ((int)uart == NC) {
error("Serial pinout mapping failed");
}
obj->uart = (CMSDK_UART_TypeDef *)uart;
//set baud rate and enable Uart in normarl mode (RX and TX enabled)
switch (uart) {
case UART_0:
{
CMSDK_UART0->CTRL = 0; // Disable UART when changing configuration
if ((int)tx != NC) {
CMSDK_UART0->CTRL = 0x1; // TX enable
}
if ((int)rx != NC) {
CMSDK_UART0->CTRL |= 0x2; // RX enable
}
}
break;
case UART_1:
{
CMSDK_UART1->CTRL = 0; // Disable UART when changing configuration
if((int)tx != NC) {
CMSDK_UART1->CTRL = 0x1; // TX enable
}
if((int)rx != NC) {
CMSDK_UART1->CTRL |= 0x2; // RX enable
}
}
break;
}
// set default baud rate and format
serial_baud(obj, 9600);
// pinout the chosen uart
pinmap_pinout(tx, PinMap_UART_TX);
pinmap_pinout(rx, PinMap_UART_RX);
switch (uart) {
case UART_0:
obj->index = 0;
break;
case UART_1:
obj->index = 1;
break;
}
uart_data[obj->index].sw_rts.pin = NC;
uart_data[obj->index].sw_cts.pin = NC;
serial_set_flow_control(obj, FlowControlNone, NC, NC);
is_stdio_uart = (uart == STDIO_UART) ? (1) : (0);
if (is_stdio_uart) {
stdio_uart_inited = 1;
memcpy(&stdio_uart, obj, sizeof(serial_t));
}
}
void serial_free(serial_t *obj) {
uart_data[obj->index].serial_irq_id = 0;
}
// serial_baud
// set the baud rate, taking in to account the current SystemFrequency
void serial_baud(serial_t *obj, int baudrate) {
// BEETLE has a simple divider to control the baud rate. The formula is:
//
// Baudrate = PCLK / BAUDDIV
//
// PCLK = SystemCoreClock
// so for a desired baud rate of 9600
// SystemCoreClock / 9600
//
//check to see if minimum baud value entered
int baudrate_div = 0;
baudrate_div = SystemCoreClock / baudrate;
if (baudrate >= 16) {
switch ((int)obj->uart) {
case UART_0:
CMSDK_UART0->BAUDDIV = baudrate_div;
break;
case UART_1:
CMSDK_UART1->BAUDDIV = baudrate_div;
break;
default:
error("serial_baud");
break;
}
} else {
error("serial_baud");
}
}
void serial_format(serial_t *obj, int data_bits,
SerialParity parity, int stop_bits) {
}
/******************************************************************************
* INTERRUPTS HANDLING
******************************************************************************/
static inline void uart_irq(uint32_t intstatus, uint32_t index,
CMSDK_UART_TypeDef *puart) {
SerialIrq irq_type;
switch (intstatus) {
case 1:
{
irq_type = TxIrq;
}
break;
case 2:
{
irq_type = RxIrq;
}
break;
default: return;
} /* End of Switch */
if ((irq_type == RxIrq) && (NC != uart_data[index].sw_rts.pin)) {
gpio_write(&uart_data[index].sw_rts, 1);
// Disable interrupt if it wasn't enabled by other part of the application
if (!uart_data[index].rx_irq_set_api) {
// puart->CTRL &= ~(1 << RxIrq);
/* Disable Rx interrupt */
puart->CTRL &= ~(CMSDK_UART_CTRL_RXIRQEN_Msk);
}
}
if (uart_data[index].serial_irq_id != 0) {
if ((irq_type != RxIrq) || (uart_data[index].rx_irq_set_api)) {
irq_handler(uart_data[index].serial_irq_id, irq_type);
}
}
if( irq_type == TxIrq ) {
/* Clear the TX interrupt Flag */
puart->INTCLEAR |= 0x01;
} else {
/* Clear the Rx interupt Flag */
puart->INTCLEAR |= 0x02;
}
}
void uart0_irq() {
uart_irq(CMSDK_UART0->INTSTATUS & 0x3, 0,
(CMSDK_UART_TypeDef*)CMSDK_UART0);
}
void uart1_irq() {
uart_irq(CMSDK_UART1->INTSTATUS & 0x3, 1,
(CMSDK_UART_TypeDef*)CMSDK_UART1);
}
void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id) {
irq_handler = handler;
uart_data[obj->index].serial_irq_id = id;
}
static void serial_irq_set_internal(serial_t *obj, SerialIrq irq, uint32_t enable) {
/* Declare a variable of type IRQn, initialise to 0 */
IRQn_Type irq_n = (IRQn_Type)0;
uint32_t vector = 0;
switch ((int)obj->uart) {
/*********************************************************************
* BEETLE SOC BOARD *
*********************************************************************/
case UART_0:
{
irq_n = UART0_IRQn;
vector = (uint32_t)&uart0_irq;
}
break;
case UART_1:
{
irq_n = UART1_IRQn;
vector = (uint32_t)&uart1_irq;
}
break;
}
if (enable) {
if(irq == TxIrq) {
/* Transmit IRQ, set appripriate enable */
/* set TX interrupt enable in CTRL REG */
obj->uart->CTRL |= CMSDK_UART_CTRL_TXIRQEN_Msk;
} else {
/* set Rx interrupt on in CTRL REG */
obj->uart->CTRL |= CMSDK_UART_CTRL_RXIRQEN_Msk;
}
NVIC_SetVector(irq_n, vector);
NVIC_EnableIRQ(irq_n);
} else if ((irq == TxIrq) || (uart_data[obj->index].rx_irq_set_api
+ uart_data[obj->index].rx_irq_set_flow == 0)) {
/* Disable IRQ */
int all_disabled = 0;
SerialIrq other_irq = (irq == RxIrq) ? (TxIrq) : (RxIrq);
obj->uart->CTRL &= ~(1 << (irq + 2));
all_disabled = (obj->uart->CTRL & (1 << (other_irq + 2))) == 0;
if (all_disabled) {
NVIC_DisableIRQ(irq_n);
}
}
}
void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable) {
if (RxIrq == irq)
uart_data[obj->index].rx_irq_set_api = enable;
serial_irq_set_internal(obj, irq, enable);
}
/******************************************************************************
* READ/WRITE
******************************************************************************/
int serial_getc(serial_t *obj) {
while (serial_readable(obj) == 0);
int data = obj->uart->DATA;
return data;
}
void serial_putc(serial_t *obj, int c) {
#ifdef SERIAL_TEST
// Add CR to LF
if (c == 0x0A) {
while (serial_writable(obj));
obj->uart->DATA = 0x0D;
}
#endif
while (serial_writable(obj));
obj->uart->DATA = c;
}
int serial_readable(serial_t *obj) {
return obj->uart->STATE & 2;
}
int serial_writable(serial_t *obj) {
return obj->uart->STATE & 1;
}
void serial_clear(serial_t *obj) {
obj->uart->DATA = 0x00;
}
void serial_pinout_tx(PinName tx) {
pinmap_pinout(tx, PinMap_UART_TX);
}
void serial_break_set(serial_t *obj) {
}
void serial_break_clear(serial_t *obj) {
}
void serial_set_flow_control(serial_t *obj, FlowControl type,
PinName rxflow, PinName txflow) {
}
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