让你的Launchpad/RF2500控制音乐播放
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接上篇https://bbs.eeworld.com.cn/thread-294145-1-1.html
TI 给出了Capacitive Touch BoosterPack（触摸板）附带的上位机软件软件。
MediaPad.rar
(254.02 KB, 下载次数: 131)
而该软件即具有控制音乐播放之功能，用户接口就是串口，相应指令即可实现相应的控制功能。
打开播放器 80 80
播放暂停 38 38 38 38
下一曲 34 34 34 34
上一曲 3C 3C 3C 3C
以上是本人暂时得出控制指令，向串口发送相应指令（比如发送4次0x34即可下一曲）
另外可以实现音量加减，但暂时没搞定对应指令。
具体到Launchpad,我们可以利用它的定时器模拟串口，
代码如下：
#include "msp430g2452.h"
//------------------------------------------------------------------------------
// Hardware-related definitions
//------------------------------------------------------------------------------
#define UART_TXD 0x02 // TXD on P1.1 (Timer0_A.OUT0)
#define UART_RXD 0x04 // RXD on P1.2 (Timer0_A.CCI1A)
//------------------------------------------------------------------------------
// Conditions for 9600 Baud SW UART, SMCLK = 1MHz
//------------------------------------------------------------------------------
#define UART_TBIT_DIV_2 (1000000 / (9600 * 2))
#define UART_TBIT (1000000 / 9600)
//------------------------------------------------------------------------------
// Global variables used for full-duplex UART communication
//------------------------------------------------------------------------------
unsigned int txData; // UART internal variable for TX
unsigned char rxBuffer; // Received UART character
unsigned int i;
//------------------------------------------------------------------------------
// Function prototypes
//------------------------------------------------------------------------------
void TimerA_UART_init(void);
void TimerA_UART_tx(unsigned char byte);
void TimerA_UART_print(char *string);
void Delay(unsigned int i)
{
while (i != 0)
{
i--;
}
}
//------------------------------------------------------------------------------
// main()
//------------------------------------------------------------------------------
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
DCOCTL = 0x00; // Set DCOCLK to 1MHz
BCSCTL1 = CALBC1_1MHZ;
DCOCTL = CALDCO_1MHZ;
P1OUT = 0x00; // Initialize all GPIO
P1SEL = UART_TXD + UART_RXD; // Timer function for TXD/RXD pins
P1DIR = 0x43; // Set all pins but RXD to output
__enable_interrupt();
while (1) // 按键消抖
{
if ((0x08 & P1IN) == 0x00)
{
for(int i=0;i<4000;i++);
if ((0x08 & P1IN) == 0x08)
{
P1OUT |= BIT6;
TimerA_UART_init(); // Start Timer_A UART
TimerA_UART_tx(0x34); //发送4次0x34实现下一曲
TimerA_UART_tx(0x34);
TimerA_UART_tx(0x34);
TimerA_UART_tx(0x34);
}
}
}
}
//------------------------------------------------------------------------------
// Function configures Timer_A for full-duplex UART operation
//------------------------------------------------------------------------------
void TimerA_UART_init(void)
{
TACCTL0 = OUT; // Set TXD Idle as Mark = '1'
TACCTL1 = SCS + CM1 + CAP + CCIE; // Sync, Neg Edge, Capture, Int
TACTL = TASSEL_2 + MC_2; // SMCLK, start in continuous mode
}
//------------------------------------------------------------------------------
// Outputs one byte using the Timer_A UART
//------------------------------------------------------------------------------
void TimerA_UART_tx(unsigned char byte)
{
while (TACCTL0 & CCIE); // Ensure last char got TX'd
TACCR0 = TAR; // Current state of TA counter
TACCR0 += UART_TBIT; // One bit time till first bit
TACCTL0 = OUTMOD0 + CCIE; // Set TXD on EQU0, Int
txData = byte; // Load global variable
txData |= 0x100; // Add mark stop bit to TXData
txData <<= 1; // Add space start bit
}
//------------------------------------------------------------------------------
// Prints a string over using the Timer_A UART
//------------------------------------------------------------------------------
void TimerA_UART_print(char *string)
{
while (*string) {
TimerA_UART_tx(*string++);
}
}
//------------------------------------------------------------------------------
// Timer_A UART - Transmit Interrupt Handler
//------------------------------------------------------------------------------
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A0_ISR(void)
{
static unsigned char txBitCnt = 10;
TACCR0 += UART_TBIT; // Add Offset to CCRx
if (txBitCnt == 0) { // All bits TXed?
TACCTL0 &= ~CCIE; // All bits TXed, disable interrupt
txBitCnt = 10; // Re-load bit counter
}
else {
if (txData & 0x01) {
TACCTL0 &= ~OUTMOD2; // TX Mark '1'
}
else {
TACCTL0 |= OUTMOD2; // TX Space '0'
}
txData >>= 1;
txBitCnt--;
}
}
//------------------------------------------------------------------------------
// Timer_A UART - Receive Interrupt Handler
//------------------------------------------------------------------------------
#pragma vector = TIMER0_A1_VECTOR
__interrupt void Timer_A1_ISR(void)
{
static unsigned char rxBitCnt = 8;
static unsigned char rxData = 0;
switch (__even_in_range(TA0IV, TA0IV_TAIFG)) { // Use calculated branching
case TA0IV_TACCR1: // TACCR1 CCIFG - UART RX
TACCR1 += UART_TBIT; // Add Offset to CCRx
if (TACCTL1 & CAP) { // Capture mode = start bit edge
TACCTL1 &= ~CAP; // Switch capture to compare mode
TACCR1 += UART_TBIT_DIV_2; // Point CCRx to middle of D0
}
else {
rxData >>= 1;
if (TACCTL1 & SCCI) { // Get bit waiting in receive latch
rxData |= 0x80;
}
rxBitCnt--;
if (rxBitCnt == 0) { // All bits RXed?
rxBuffer = rxData; // Store in global variable
rxBitCnt = 8; // Re-load bit counter
TACCTL1 |= CAP; // Switch compare to capture mode
__bic_SR_register_on_exit(LPM0_bits); // Clear LPM0 bits from 0(SR)
}
}
break;
}
}
具体到单机版（其中一个）的RF2500，代码如下：
#include "msp430x22x4.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
BCSCTL1 = CALBC1_1MHZ; // Set DCO
DCOCTL = CALDCO_1MHZ;
P1DIR |= BIT0;
P1OUT &=~BIT0;
P1DIR &= ~BIT2; //P1.2口通过开关直接接地，设置为输入
P1REN |= BIT2; //P1.2口开启上拉或者下拉电阻功能
P1OUT |= BIT2; //选择上拉
P1IE |= BIT2;
P1IES &= ~BIT2; //上拉电阻，开关直接接地，应选择上升沿触发
P3SEL = 0x30; // P3.4,5 = USCI_A0 TXD/RXD
UCA0CTL1 |= UCSSEL_2; // SMCLK
UCA0BR0 = 104; // 1MHz 9600
UCA0BR1 = 0; // 1MHz 9600
UCA0MCTL = UCBRS0; // Modulation UCBRSx = 1
UCA0CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled
while(1);
}
// Port 1 interrupt service routine
#pragma vector=PORT1_VECTOR
__interrupt void Port_1(void)
{
P1OUT ^= BIT0;
UCA0TXBUF = 0x34;
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = 0x34;
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = 0x34;
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = 0x34;
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
P1IFG &= ~BIT2; // P1.2 IFG cleared
}
//发送4次0x34实现下一曲
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