omapl138 starterware uart2 波特率异常

Hi, Shine:

是否可以分享一个375MHz 所需的.gel配置文件。（可能是PLL0片的错误）

我的gel文件中关于PLL0的配置如下，375MHz的PLLM最大只能到11，再大串口就乱码了，但配为11应该没有跑到最高主频，是否可以提供一组PLL0配置，可以达到最快频率的？

谢谢！

Set_Core_456MHz() {
device_PLL0(0,18,0,0,1,3,9);
GEL_TextOut("\tPLL0 init done for Core:456MHz, EMIFA:114MHz\n","Output",1,1,1);
}

Set_Core_375MHz() {
device_PLL0(0,11,0,0,1,3,9);
GEL_TextOut("\tPLL0 init done for Core:375MHz, EMIFA:114MHz\n","Output",1,1,1);
}

device_PLL0(unsigned int CLKMODE, unsigned int PLLM, unsigned int POSTDIV,unsigned int PLLDIV1, unsigned int PLLDIV2, unsigned int PLLDIV3, unsigned int PLLDIV7 ) {

unsigned int i=0;

/* Clear PLL lock bit */
CFGCHIP0 &= ~(0x00000010);

/* Set PLLENSRC '0',bit 5, PLL Enable(PLLEN) selection is controlled through MMR */
PLL0_PLLCTL &= ~(0x00000020);

/* PLLCTL.EXTCLKSRC bit 9 should be left at 0 for Freon */
PLL0_PLLCTL &= ~(0x00000200);

/* Set PLLEN=0 to put in bypass mode*/
PLL0_PLLCTL &= ~(0x00000001);

/*wait for 4 cycles to allow PLLEN mux switches properly to bypass clock*/
for(i=0; i<PLLEN_MUX_SWITCH; i++) {;}

/* Select the Clock Mode bit 8 as External Clock or On Chip Oscilator*/
PLL0_PLLCTL &= 0xFFFFFEFF;
PLL0_PLLCTL |= (CLKMODE << 8);

/*Clear PLLRST bit to reset the PLL */
PLL0_PLLCTL &= ~(0x00000008);

/* Disable the PLL output*/
PLL0_PLLCTL |= (0x00000010);

/* PLL initialization sequence
Power up the PLL by setting PWRDN bit set to 0 */
PLL0_PLLCTL &= ~(0x00000002);

/* Enable the PLL output*/
PLL0_PLLCTL &= ~(0x00000010);

/*PLL stabilisation time- take out this step , not required here when PLL in bypassmode*/
for(i=0; i<PLL_STABILIZATION_TIME; i++) {;}

/*Program the required multiplier value in PLLM*/
PLL0_PLLM = PLLM;

/*If desired to scale all the SYSCLK frequencies of a given PLLC, program the POSTDIV ratio*/
PLL0_POSTDIV = 0x8000 | POSTDIV;

/*Check for the GOSTAT bit in PLLSTAT to clear to 0 to indicate that no GO operation is currently in progress*/
while(PLL0_PLLSTAT & 0x1==1){}

/*Program the RATIO field in PLLDIVx with the desired divide factors. In addition, make sure in this step you leave the PLLDIVx.DxEN bits set so clocks are still enabled (default).*/
PLL0_PLLDIV1 = 0x8000 | PLLDIV1; // Fixed Ratio /1
PLL0_PLLDIV2 = 0x8000 | PLLDIV2; // Fixed Ratio /2
PLL0_PLLDIV4 = 0x8000 | (((PLLDIV1+1)*4)-1); // Fixed Ratio /4
PLL0_PLLDIV6 = 0x8000 | PLLDIV1; // Fixed Ratio /1
PLL0_PLLDIV3 = 0x8000 | PLLDIV3; // Variable Ratio (EMIF)
PLL0_PLLDIV7 = 0x8000 | PLLDIV7; // Variable Ratio (RMII)

/*Set the GOSET bit in PLLCMD to 1 to initiate a new divider transition.*/
PLL0_PLLCMD |= 0x1;

/*Wait for the GOSTAT bit in PLLSTAT to clear to 0 (completion of phase alignment).*/
while(PLL0_PLLSTAT & 0x1==1) { }

/*Wait for PLL to reset properly.*/
for(i=0; i<PLL_RESET_TIME_CNT; i++) {;}

/*Set the PLLRST bit in PLLCTL to 1 to bring the PLL out of reset*/
PLL0_PLLCTL |= 0x8;

/*Wait for PLL to lock.*/
for(i=0; i<PLL_LOCK_TIME_CNT; i++) {;}

/*Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass mode*/
PLL0_PLLCTL |= 0x1;
}

Hi Shine:

还是有些异常：

使用如下代码，使用仿真器，直接在arm上运行，如果gel文件中PLL0配置主频为456MHz串口打印正常，如果修为其他主频（器件是365MHz）,则是波特率异常；不知道是哪里影响了串口波特率啊？

int main(void)
{
int i,j,target_int_count=2;
char ch[2];

/* 初始化串口终端 使用串口2*/
UARTStdioInit();

/* 打印串口终端信息*/

UARTPuts("Test Application.\r\n", -2);

感谢！