尊敬的先生：
我将此板连接到一个简单的键盘、尝试将其设置为进入 LPM4模式、禁用所有 I/O 并禁用所有 SPI 和 I2C、确认 I/O 没有进行电流确认、已启用按键唤醒并可以唤醒。
在电流测试期间、移除了从 SBW_TST 到 GND 的所有9个跳线、移除了 JP8、电路板仍然接收到500uA 以上的电流。
请告知我错过了哪些程序。
非常感谢。
作者：Martin
这是我使用 MSP-EXP430F5529LP 进行的测试。
首次使用 MSP430F55xx_LPM4.c 运行、电流读数为1.1uA、表明器件处于 LPM4中。
然后、在进入 LPM4之前、我添加了使用25MHz DCO 切换 P1.1的代码：
#include <msp430.h>
void SetVcoreUp (unsigned int level);
int main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW+WDTHOLD; // Stop WDT
P1DIR |= BIT1; // P1.1 output
P1DIR |= BIT0; // ACLK set out to pins
P1SEL |= BIT0;
P2DIR |= BIT2; // SMCLK set out to pins
P2SEL |= BIT2;
P7DIR |= BIT7; // MCLK set out to pins
P7SEL |= BIT7;
// Increase Vcore setting to level3 to support fsystem=25MHz
// NOTE: Change core voltage one level at a time..
SetVcoreUp (0x01);
SetVcoreUp (0x02);
SetVcoreUp (0x03);
UCSCTL3 = SELREF_2; // Set DCO FLL reference = REFO
UCSCTL4 |= SELA_2; // Set ACLK = REFO
__bis_SR_register(SCG0); // Disable the FLL control loop
UCSCTL0 = 0x0000; // Set lowest possible DCOx, MODx
UCSCTL1 = DCORSEL_7; // Select DCO range 50MHz operation
UCSCTL2 = FLLD_0 + 762; // Set DCO Multiplier for 25MHz
// (N + 1) * FLLRef = Fdco
// (762 + 1) * 32768 = 25MHz
// Set FLL Div = fDCOCLK/2
__bic_SR_register(SCG0); // Enable the FLL control loop
// Worst-case settling time for the DCO when the DCO range bits have been
// changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx
// UG for optimization.
// 32 x 32 x 25 MHz / 32,768 Hz ~ 780k MCLK cycles for DCO to settle
__delay_cycles(782000);
// Loop until XT1,XT2 & DCO stabilizes - In this case only DCO has to stabilize
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG);
// Clear XT2,XT1,DCO fault flags
SFRIFG1 &= ~OFIFG; // Clear fault flags
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
P1OUT ^= BIT1; // Toggle P1.1
__delay_cycles(600000); // Delay
WDTCTL = WDTPW | WDTHOLD; // Stop WDT
// Setup UCS
UCSCTL4 = SELA_1; // Ensure VLO is ACLK source
// Port Configuration
P1OUT = 0x00;P2OUT = 0x00;P3OUT = 0x00;P4OUT = 0x00;P5OUT = 0x00;P6OUT = 0x00;
P7OUT = 0x00;P8OUT = 0x00;PJOUT = 0x00;
P1DIR = 0xFF;P2DIR = 0xFF;P3DIR = 0xFF;P4DIR = 0xFF;P5DIR = 0xFF;P6DIR = 0xFF;
P7DIR = 0xFF;P8DIR = 0xFF;PJDIR = 0xFF;
// Disable VUSB LDO and SLDO
USBKEYPID = 0x9628; // set USB KEYandPID to 0x9628
// access to USB config registers enabled
USBPWRCTL &= ~(SLDOEN+VUSBEN); // Disable the VUSB LDO and the SLDO
USBKEYPID = 0x9600; // access to USB config registers disabled
// Disable SVS
PMMCTL0_H = PMMPW_H; // PMM Password
SVSMHCTL &= ~(SVMHE+SVSHE); // Disable High side SVS
SVSMLCTL &= ~(SVMLE+SVSLE); // Disable Low side SVS
__bis_SR_register(LPM4_bits); // Enter LPM4
__no_operation();
}
void SetVcoreUp (unsigned int level)
{
// Open PMM registers for write
PMMCTL0_H = PMMPW_H;
// Set SVS/SVM high side new level
SVSMHCTL = SVSHE + SVSHRVL0 * level + SVMHE + SVSMHRRL0 * level;
// Set SVM low side to new level
SVSMLCTL = SVSLE + SVMLE + SVSMLRRL0 * level;
// Wait till SVM is settled
while ((PMMIFG & SVSMLDLYIFG) == 0);
// Clear already set flags
PMMIFG &= ~(SVMLVLRIFG + SVMLIFG);
// Set VCore to new level
PMMCTL0_L = PMMCOREV0 * level;
// Wait till new level reached
if ((PMMIFG & SVMLIFG))
while ((PMMIFG & SVMLVLRIFG) == 0);
// Set SVS/SVM low side to new level
SVSMLCTL = SVSLE + SVSLRVL0 * level + SVMLE + SVSMLRRL0 * level;
// Lock PMM registers for write access
PMMCTL0_H = 0x00;
}
电流读数为1.3uA、没有问题。
请尝试上面的代码吗？
此致、
肖恩