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mbed-os/targets/TARGET_ARM_SSG/TARGET_MPS2/serial_api.c

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/* mbed Microcontroller Library
* Copyright (c) 2006-2015 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 "mbed_error.h"
#include "gpio_api.h"
/******************************************************************************
* INITIALIZATION
******************************************************************************/
static const PinMap PinMap_UART_TX[] = {
{USBTX , UART_0, 0},
{XB_TX , UART_1, 0},
{SH0_TX , UART_2, 0},
{SH1_TX , UART_3, 0},
{NC , NC , 0}
};
static const PinMap PinMap_UART_RX[] = {
{USBRX , UART_0, 0},
{XB_RX , UART_1, 0},
{SH0_RX , UART_2, 0},
{SH1_RX , UART_3, 0},
{NC , NC , 0}
};
#define UART_NUM 4
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 = 0x00; // Disable UART when changing configuration
if((int)uart_tx != NC)
{
CMSDK_UART0->CTRL |= 0x01; // TX enable
} else {
CMSDK_UART0->CTRL &= 0xFFFE; // TX disable
}
if((int)uart_rx != NC)
{
CMSDK_UART0->CTRL |= 0x02; // RX enable
} else {
CMSDK_UART0->CTRL &= 0xFFFD; // RX disable
}
}
break;
case UART_1: //XBEE SOCKET UART
{
CMSDK_UART1->CTRL = 0x00; // Disable UART when changing configuration
if((int)tx != NC)
{
CMSDK_UART1->CTRL = 0x1; // TX enable
CMSDK_GPIO1->ALTFUNCSET |= 0x0100;
}
if((int)rx != NC)
{
CMSDK_UART1->CTRL |= 0x2; // RX enable
CMSDK_GPIO1->ALTFUNCSET |= 0x0080;
}
}
break;
case UART_2: //Sheild0 UART
{
CMSDK_UART3->CTRL = 0x00; // Disable UART when changing configuration
if((int)tx != NC)
{
CMSDK_UART3->CTRL = 0x1; // TX enable
CMSDK_GPIO0->ALTFUNCSET |= 0x0010;
}
if((int)rx != NC)
{
CMSDK_UART3->CTRL |= 0x2; // RX enable
CMSDK_GPIO0->ALTFUNCSET |= 0x0001;
}
}
break;
case UART_3: //Sheild1 UART
{
CMSDK_UART4->CTRL = 0x00; // Disable UART when changing configuration
if((int)tx != NC)
{
CMSDK_UART4->CTRL = 0x1; // TX enable
CMSDK_GPIO1->ALTFUNCSET |= 0x4000;
}
if((int)rx != NC)
{
CMSDK_UART4->CTRL |= 0x2; // RX enable
CMSDK_GPIO1->ALTFUNCSET |= 0x0400;
}
}
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;
case UART_2: obj->index = 2; break;
case UART_3: obj->index = 3; break;
}
uart_data[obj->index].sw_rts.pin = NC;
uart_data[obj->index].sw_cts.pin = 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) {
// The MPS2 has a simple divider to control the baud rate. The formula is:
//
// Baudrate = PCLK / BAUDDIV
//
// PCLK = 25 Mhz
// so for a desired baud rate of 9600
// 25000000 / 9600 = 2604
//
//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;
case UART_2: CMSDK_UART3->BAUDDIV = baudrate_div; break;
case UART_3: CMSDK_UART4->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 ((RxIrq == irq_type) && (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)
{
/* 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 uart2_irq() {uart_irq(CMSDK_UART3->INTSTATUS & 0x3, 2, (CMSDK_UART_TypeDef*)CMSDK_UART3);}
void uart3_irq() {uart_irq(CMSDK_UART4->INTSTATUS & 0x3, 3, (CMSDK_UART_TypeDef*)CMSDK_UART4);}
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)
{
case UART_0:
{
irq_n = (( irq == TxIrq ) ? UARTTX0_IRQn : UARTRX0_IRQn);
vector = (uint32_t)&uart0_irq;
}
break;
case UART_1:
{
irq_n = (( irq == TxIrq ) ? UARTTX1_IRQn : UARTRX1_IRQn);
vector = (uint32_t)&uart1_irq;
}
break;
case UART_2:
{
irq_n = (( irq == TxIrq ) ? UARTTX3_IRQn : UARTRX3_IRQn);
vector = (uint32_t)&uart2_irq;
}
break;
case UART_3:
{
irq_n = (( irq == TxIrq ) ? UARTTX4_IRQn : UARTRX4_IRQn);
vector = (uint32_t)&uart3_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
{ /* Disable IRQ */
obj->uart->CTRL &= ~(1 << (irq + 2));
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) {
while (serial_writable(obj));
obj->uart->DATA = c;
}
int serial_readable(serial_t *obj) {
return obj->uart->STATE & 0x2;
}
int serial_writable(serial_t *obj) {
return obj->uart->STATE & 0x1;
}
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) {
}
const PinMap *serial_tx_pinmap()
{
return PinMap_UART_TX;
}
const PinMap *serial_rx_pinmap()
{
return PinMap_UART_RX;
}
const PinMap *serial_cts_pinmap()
{
#if !DEVICE_SERIAL_FC
static const PinMap PinMap_UART_CTS[] = {
{NC, NC, 0}
};
#endif
return PinMap_UART_CTS;
}
const PinMap *serial_rts_pinmap()
{
#if !DEVICE_SERIAL_FC
static const PinMap PinMap_UART_RTS[] = {
{NC, NC, 0}
};
#endif
return PinMap_UART_RTS;
}
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