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/bridge_protocol_handler.c

@@ -3,6 +3,7 @@
 #include "main.h"
 #include "i2c_addresses.h"
 #include "i2c.h"
+#include "led_pwm.h"
 
 void SetError(uint8_t error);
 void SetGenericError();
@@ -31,10 +32,16 @@ void BridgeProtocolHandler()
             BridgeTxSize = KEYBOARD_MATRIX_COLS_NUM*KEYBOARD_MATRIX_ROWS_NUM;
             memcpy(BridgeTxBuffer, keyMatrix.keyStates, BridgeTxSize);
             break;
-        case BRIDGE_COMMAND_SET_LED:
+        case BRIDGE_COMMAND_SET_TEST_LED:
             TEST_LED_OFF();
             BridgeTxSize = 0;
             TEST_LED_SET(BridgeRxBuffer[1]);
             break;
+        case BRIDGE_COMMAND_SET_LED_PWM:
+            BridgeTxSize = 0;
+            uint8_t brightnessPercent = BridgeRxBuffer[1];
+            LedPwm_SetBrightness(brightnessPercent);
+            TEST_LED_SET(brightnessPercent == 0);
+            break;
     }
 }

left/src/bridge_protocol_handler.h

@@ -14,7 +14,8 @@
     #define PROTOCOL_RESPONSE_GENERIC_ERROR 1
 
     #define BRIDGE_COMMAND_GET_KEY_STATES 0
-    #define BRIDGE_COMMAND_SET_LED        1
+    #define BRIDGE_COMMAND_SET_TEST_LED   1
+    #define BRIDGE_COMMAND_SET_LED_PWM    2
 
 // Variables:
 

left/src/init_peripherials.c

@@ -6,6 +6,7 @@
 #include "fsl_i2c.h"
 #include "fsl_clock.h"
 #include "i2c.h"
+#include "led_pwm.h"
 
 void InitI2c() {
     port_pin_config_t pinConfig = {
@@ -41,5 +42,6 @@ void InitPeripherials(void)
 {
     InitLedDriver();
     InitTestLed();
+    LedPwm_Init();
     InitI2c();
 }

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);
+}

left/src/led_pwm.h

@@ -0,0 +1,27 @@
+#ifndef __LED_PWM_H__
+#define __LED_PWM_H__
+
+// Includes:
+
+    #include "fsl_tpm.h"
+
+// Macros:
+
+    #define LED_PWM_PORT  PORTB
+    #define LED_PWM_CLOCK kCLOCK_PortB
+    #define LED_PWM_PIN   5
+
+    #define LED_PWM_TPM_BASEADDR TPM1
+    #define LED_PWM_TPM_CHANNEL kTPM_Chnl_1
+
+    #define TPM_SOURCE_CLOCK CLOCK_GetFreq(kCLOCK_BusClk)
+    #define TPM_PWM_FREQUENCY 24000U
+
+    #define INITIAL_DUTY_CYCLE_PERCENT 100U
+
+// Functions:
+
+    extern void LedPwm_Init();
+    void LedPwm_SetBrightness(uint8_t brightnessPercent);
+
+#endif