PWM_Config 定义问题

CC2640 iar环境 想在Board_LED引脚输出PWM，编译出现如下问题

Error[Li005]: no definition for "PWM_config" [referenced from C:\ti\simplelink\ble_cc26xx_2_01_00_44423\

没有找到有PWM_Config定义的例程，求教各位怎么解决。代码用的是User_Guide里面的，如下

PWM_Handle pwm1;
PWM_Params params;
//uint8_t pwmOutputNumber = 0;

PWM_Params_init(&params);
params.period = 20000;                  // Period in microseconds
params.dutyMode = PWM_DUTY_COUNTS; // Set PWM duty mode

pwm1 = PWM_open(Board_LED1, &params);

if (pwm1 == NULL) {
/* Error opening PWM */
}
PWM_setDuty(pwm1, 3000); // Set a duty cycle of 3000 PWM timer counts