[参考译文] TM4C1290NCPDT：软件如何检测TM4C129的哪个部件(引脚)执行？

这只是一个后续的更完整的代码实施了上面讨论的方法。  它仅在TM4C129EKCPDT上进行了测试，但我认为它应该在TQFP封装中的八个TM4C129部件中的任意一个针脚62上正确设置PWM。  检测MCU部件变体的部分在其他情况下可能很有用。

// Detect the type of MCU at runtime and set up either PWM 6 or PWM 7, whichever one controls
// pin 62 on the current MCU variant. 

// PinMux could do some of this setup, but we need to make parts of it conditional on the MCU
// variant, and other parts get auto-generated only if one of those is enabled.  So it is
// easiest to just do it all here.

// This set up is for the SYSCTL_PERIPH_PWM0 PWM "module", of which the MCU has only one.  It
// contains four PWM "generator blocks".  Each PWM generator block has two PWM "output signals"
// which correspond with the output number (0..7); they are not 0 and 1 for every block.
// A single "control block" maps the pins and sets the pin polarities.
MAP_SysCtlPeripheralEnable( SYSCTL_PERIPH_PWM0 );       // Enable the PWM module.
SysCtlPWMClockSet( SYSCTL_PWMDIV_1 );                   // Set the clock divider for all PWM signals.

// Set up PWM generator block 3, which conveniently controls both pin PWM6 and pin PWM7 making this
// part the same regardless of the MCU variant.
PWMGenConfigure( PWM0_BASE, PWM_GEN_3, PWM_GEN_MODE_DOWN | PWM_GEN_MODE_NO_SYNC );
PWMGenPeriodSet( PWM0_BASE, PWM_GEN_3, 1831 );          // Sets to 60MHz/1831 = 32.7689787 KHz, almost 1Hz high.  That is an error of about 30 ppm.
PWMGenEnable( PWM0_BASE, PWM_GEN_3 );                   // Start the timers in the PWM generator block.

// Set up the PWM output signals (pins).  This part is dependent on the MCU variant.  I didn't
// find a way to detect the variant using the TivaWare library (although SysCtlPeripheralPresent()
// lets you test for the presence of various peripherals), but the Device Identification registers
// in the MCU do provide that info.  I asked on the TI forum but didn't get any suggestions about
// a better way to do this: e2e.ti.com/.../tm4c1290ncpdt-how-can-software-detect-which-tm4c129-part-pinout-it-is-executing-on
#define DeviceIdentification1 (*( (volatile uint32_t*) ( 0x400FE000 + 0x004 ) ) )
const uint32_t ReadOfDID1 = DeviceIdentification1;                  // Read the MCU's DID1 register.
const uint32_t ReadOfPARTNO = ( ReadOfDID1 >> 16 ) & 0x000000FF;    // Extract the PARTNO field.

// Parts with PK4/PWM6 on pin 62.
#define PARTNO_TM4C1290NCPDT (0x19)
#define PARTNO_TM4C1292NCPDT (0x1C)
#define PARTNO_TM4C129CNCPDT (0x24)
#define PARTNO_TM4C129DNCPDT (0x27)

// Parts with PK5/PWM7 on pin 62.
#define PARTNO_TM4C1294NCPDT (0x1F)
#define PARTNO_TM4C129ENCPDT (0x2D)
#define PARTNO_TM4C1294KCPDT (0x34)
#define PARTNO_TM4C129EKCPDT (0x35)

bool PK4_PWM6_on_pin_62 = ( ReadOfPARTNO == PARTNO_TM4C1290NCPDT )
                       || ( ReadOfPARTNO == PARTNO_TM4C1292NCPDT )
                       || ( ReadOfPARTNO == PARTNO_TM4C129CNCPDT )
                       || ( ReadOfPARTNO == PARTNO_TM4C129DNCPDT );

if( PK4_PWM6_on_pin_62 )
{
    // Enable pin PK4 for PWM0 M0PWM6.  For these parts it should drive pin 62.
    MAP_GPIOPinConfigure( GPIO_PK4_M0PWM6 );
    MAP_GPIOPinTypePWM( GPIO_PORTK_BASE, GPIO_PIN_4 );
    PWMPulseWidthSet( PWM0_BASE, PWM_OUT_6, 1831/2 );       // Can adjust this to get 50% duty cycle.
    PWMOutputState( PWM0_BASE, PWM_OUT_6_BIT, true );
}
else
{
    // Enable pin PK5 for PWM0 M0PWM7.  For these parts it should drive pin 62.
    MAP_GPIOPinConfigure( GPIO_PK5_M0PWM7 );
    MAP_GPIOPinTypePWM( GPIO_PORTK_BASE, GPIO_PIN_5 );
    PWMPulseWidthSet( PWM0_BASE, PWM_OUT_7, 1831/2 );       // Can adjust this to get 50% duty cycle.
    PWMOutputState( PWM0_BASE, PWM_OUT_7_BIT, true );
}