MSP430F449 LCD COMx口用示波器测不到波形，怎么办？

2019-07-28 18:22发布

站内问答 / TI MCU

2588 1

跑的是官方的例程

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*******************************************************************************
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* MSP430 CODE EXAMPLE DISCLAIMER
*
* MSP430 code examples are self-contained low-level programs that typically
* demonstrate a single peripheral function or device feature in a highly
* concise manner. For this the code may rely on the device's power-on default
* register values and settings such as the clock configuration and care must
* be taken when combining code from several examples to avoid potential side
* effects. Also see www.ti.com/grace for a GUI- and www.ti.com/msp430ware
* for an API functional library-approach to peripheral configuration.
*
* --/COPYRIGHT--*/
//*****************************************************************************
// MSP-FET430P440 Demo - LCD, Display "6543210" on STK/EVK LCD
//
// Description: Displays "6543210" on MSP-EVK430S320 LCD.
// ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
// //* An external watch crystal between XIN & XOUT is required for ACLK *//
//
// Connections MSP430 -> LCD
// -------------------------
//
// T.I. MSP-EVK430S320
// MSP430F449 6.5 digit 4 mux LCD
// #T218010
// /| --------------- --------------
// | | COM3 |-----|2 COM4 |
// --|RST COM2 |-----|1 COM3 |
// | COM1 |-----|3 COM2 |
// | COM0 |-----|4,20 COM1 |
// -|XIN SEG0 |-----|19 |
// 32kHz| SEG1 |-----|18 |
// -|XOUT SEG2 |-----|17 |
// | SEG3 |-----|16 |
// | SEG4 |-----|15 |
// | SEG5 |-----|14 |
// | SEG6 |-----|13 |
// | SEG7 |-----|12 |
// +-|R33 SEG8 |-----|11 |
// 1M | SEG9 |-----|10 |
// +-|R23 SEG10|-----|9 |
// 1M | SEG11|-----|8 |
// +-|R13 SEG12|-----|7 |
// 1M | SEG13|-----|6 |
// +-|R03 SEG14|-----|5 (bits C,E,H |
// | | | | of digit 7)|
// Vss --------------- --------------
//
// M. Buccini / H. Grewal
// Texas Instruments Inc.
// Feb 2005
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.21A
//*****************************************************************************
#include <msp430.h>
const char digit[10] =
{
0xB7, /* "0" LCD segments a+b+c+d+e+f */
0x12, /* "1" */
0x8F, /* "2" */
0x1F, /* "3" */
0x3A, /* "4" */
0x3D, /* "5" */
0xBD, /* "6" */
0x13, /* "7" */
0xBF, /* "8" */
0x3F /* "9" */
};
int main(void)
{
volatile unsigned int i; // Use volatile to prevent removal
// by compiler optimization
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
FLL_CTL0 |= XCAP14PF; // Configure load caps
for (i = 0; i < 10000; i++); // Delay for 32 kHz crystal to
// stabilize
LCDCTL = LCDON + LCD4MUX + LCDSG0_4; // LCD on, 4-Mux, segments S0-S27
BTCTL = BT_fLCD_DIV128; // LCD clock freq is ACLK/128
P5SEL = 0xFC; // Select P5.2-7 as Com and Rxx
for (;;)
{
unsigned char x;
for (x=0; x<7; x++)
{
LCDMEM[x] = digit[x]; // Display "6543210"
}
}
}

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wangjinlili

1楼-- · 2019-07-28 21:01

有没有人知道

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