Other Parts Discussed in Thread: UNIFLASH
Hi,
I am trying to set my MSP430FR2355 to 20 MHz with the DCO. I started with the example 8MHz DCO project and modified three lines as follows (lines 79, 89, 92):
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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--*/ //****************************************************************************** // MSP430FR235x Demo - Configure MCLK for 8MHz sourced from DCO. // // Description: Default DCODIV is MCLK and SMCLK source. // By default, FR235x select XT1 as FLL reference. // If XT1 is present, the XIN and XOUT pin needs to configure. // If XT1 is absent, switch to select REFO as FLL reference automatically. // XT1 is considered to be absent in this example. // f(DCOCLK) = 2^FLLD * (FLLN+1) * (fFLLREFCLK / n). // FLLD = 0, FLLN =243, n=1, DIVM =1, f(DCOCLK) = 2^0 * (243+1)*32768Hz = 8MHz, // f(DCODIV) = (243+1)*32768Hz = 8MHz, // ACLK = default REFO ~32768Hz, SMCLK = MCLK = f(DCODIV) = 8MHz. // Toggle LED to indicate that the program is running. // // MSP430FR235x // --------------- // /|\| | // | | | // --|RST | // | P1.0 |---> LED // | | // | | // | P1.1 |---> ACLK = 32768Hz // // // Darren Lu // Texas Instruments Inc. // Oct. 2016 // Built with IAR Embedded Workbench v6.50 & Code Composer Studio v6.2 //****************************************************************************** #include <msp430.h> void Software_Trim(); // Software Trim to get the best DCOFTRIM value //#define MCLK_FREQ_MHZ 8 // MCLK = 8MHz #define MCLK_FREQ_MHZ 20 // MCLK = 8MHz int main(void) { WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer __bis_SR_register(SCG0); // disable FLL CSCTL3 |= SELREF__REFOCLK; // Set REFO as FLL reference source // CSCTL1 = DCOFTRIMEN_1 | DCOFTRIM0 | DCOFTRIM1 | DCORSEL_3;// DCOFTRIM=3, DCO Range = 8MHz CSCTL1 = DCOFTRIMEN_1 | DCOFTRIM0 | DCOFTRIM1 | DCORSEL_6;// DCOFTRIM=6, DCO Range = 20MHz // CSCTL2 = FLLD_0 + 243; // DCODIV = 8MHz CSCTL2 = FLLD_0 + 609; // DCODIV = 20MHz __delay_cycles(3); __bic_SR_register(SCG0); // enable FLL Software_Trim(); // Software Trim to get the best DCOFTRIM value CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK; // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz // default DCODIV as MCLK and SMCLK source P1DIR |= BIT0 | BIT1; // set ACLK and LED pin as output P1SEL1 |= BIT1; // set ACLK pin as second function PM5CTL0 &= ~LOCKLPM5; // Disable the GPIO power-on default high-impedance mode // to activate previously configured port settings while(1) { P1OUT ^= BIT0; // Toggle P1.0 using exclusive-OR __delay_cycles(10000000); // Delay for 10000000*(1/MCLK)=1.25s } } void Software_Trim() { unsigned int oldDcoTap = 0xffff; unsigned int newDcoTap = 0xffff; unsigned int newDcoDelta = 0xffff; unsigned int bestDcoDelta = 0xffff; unsigned int csCtl0Copy = 0; unsigned int csCtl1Copy = 0; unsigned int csCtl0Read = 0; unsigned int csCtl1Read = 0; unsigned int dcoFreqTrim = 3; unsigned char endLoop = 0; do { CSCTL0 = 0x100; // DCO Tap = 256 do { CSCTL7 &= ~DCOFFG; // Clear DCO fault flag }while (CSCTL7 & DCOFFG); // Test DCO fault flag __delay_cycles((unsigned int)3000 * MCLK_FREQ_MHZ);// Wait FLL lock status (FLLUNLOCK) to be stable // Suggest to wait 24 cycles of divided FLL reference clock while((CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)) && ((CSCTL7 & DCOFFG) == 0)); csCtl0Read = CSCTL0; // Read CSCTL0 csCtl1Read = CSCTL1; // Read CSCTL1 oldDcoTap = newDcoTap; // Record DCOTAP value of last time newDcoTap = csCtl0Read & 0x01ff; // Get DCOTAP value of this time dcoFreqTrim = (csCtl1Read & 0x0070)>>4;// Get DCOFTRIM value if(newDcoTap < 256) // DCOTAP < 256 { newDcoDelta = 256 - newDcoTap; // Delta value between DCPTAP and 256 if((oldDcoTap != 0xffff) && (oldDcoTap >= 256)) // DCOTAP cross 256 endLoop = 1; // Stop while loop else { dcoFreqTrim--; CSCTL1 = (csCtl1Read & (~DCOFTRIM)) | (dcoFreqTrim<<4); } } else // DCOTAP >= 256 { newDcoDelta = newDcoTap - 256; // Delta value between DCPTAP and 256 if(oldDcoTap < 256) // DCOTAP cross 256 endLoop = 1; // Stop while loop else { dcoFreqTrim++; CSCTL1 = (csCtl1Read & (~DCOFTRIM)) | (dcoFreqTrim<<4); } } if(newDcoDelta < bestDcoDelta) // Record DCOTAP closest to 256 { csCtl0Copy = csCtl0Read; csCtl1Copy = csCtl1Read; bestDcoDelta = newDcoDelta; } }while(endLoop == 0); // Poll until endLoop == 1 CSCTL0 = csCtl0Copy; // Reload locked DCOTAP CSCTL1 = csCtl1Copy; // Reload locked DCOFTRIM while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)); // Poll until FLL is locked }
However when I do this I can get the clock to changed however I can no longer programs the MSP430. I saw the following suggestions by Bruce:
And I tried setting "No verification" under "Program/Memory Load" while this prevents the error I was getting (data verification error) the underlying program doesn't get flashed. I found I can get around this by doing a mass erase and a hard reset in uniflash however I would like to be able to flash from CCS. Is there something wrong in my code that makes it so that the msp430 can no longer be flashed once the clock is changed to 20MHz?
Thank you!
Connor