Drive the LED_PWM line of the left half via TPM which doesn't work yet for some reason. Add protocol command for setting the LED_PWM brightness of the left half. Expose UpdateUsbReports()

left/src/led_pwm.c

@@ -0,0 +1,31 @@
+#include "led_pwm.h"
+#include "fsl_port.h"
+
+void LedPwm_Init() {
+    tpm_config_t tpmInfo;
+    tpm_chnl_pwm_signal_param_t tpmParam[1];/* = {{
+            .chnlNumber = LED_PWM_TPM_CHANNEL,
+            .level = kTPM_LowTrue,
+            .dutyCyclePercent = 00,
+    }};*/
+
+    CLOCK_EnableClock(LED_PWM_CLOCK);
+    PORT_SetPinMux(LED_PWM_PORT, LED_PWM_PIN, kPORT_MuxAlt2);
+
+    tpmParam[0].chnlNumber = LED_PWM_TPM_CHANNEL;
+    tpmParam[0].level = kTPM_LowTrue;
+    tpmParam[0].dutyCyclePercent = 100 - INITIAL_DUTY_CYCLE_PERCENT;
+    TPM_GetDefaultConfig(&tpmInfo);
+
+    TPM_Init(LED_PWM_TPM_BASEADDR, &tpmInfo);
+    TPM_SetupPwm(LED_PWM_TPM_BASEADDR, tpmParam, sizeof(tpmParam),
+                 kTPM_EdgeAlignedPwm, TPM_PWM_FREQUENCY, TPM_SOURCE_CLOCK);
+    TPM_StartTimer(LED_PWM_TPM_BASEADDR, kTPM_SystemClock);
+//    LedPwm_SetBrightness(INITIAL_DUTY_CYCLE_PERCENT);
+}
+
+void LedPwm_SetBrightness(uint8_t brightnessPercent)
+{
+    TPM_UpdatePwmDutycycle(LED_PWM_TPM_BASEADDR, LED_PWM_TPM_CHANNEL,
+            kTPM_EdgeAlignedPwm, 100-brightnessPercent);
+}