AP_IOMCU: account for possibility of SBUS_OUT in PWM structures

Author: andyp1per

libraries/AP_IOMCU/AP_IOMCU.cpp

@@ -346,7 +346,7 @@ void AP_IOMCU::thread_main(void)
         // update failsafe pwm
         if (pwm_out.failsafe_pwm_set != pwm_out.failsafe_pwm_sent) {
             uint8_t set = pwm_out.failsafe_pwm_set;
-            if (write_registers(PAGE_FAILSAFE_PWM, 0, IOMCU_MAX_CHANNELS, pwm_out.failsafe_pwm)) {
+            if (write_registers(PAGE_FAILSAFE_PWM, 0, IOMCU_MAX_RC_CHANNELS, pwm_out.failsafe_pwm)) {
                 pwm_out.failsafe_pwm_sent = set;
             }
         }
@@ -372,7 +372,7 @@ void AP_IOMCU::send_servo_out()
         if (rate.sbus_rate_hz == 0) {
             n = MIN(n, 8);
         } else {
-            n = MIN(n, IOMCU_MAX_CHANNELS);
+            n = MIN(n, IOMCU_MAX_RC_CHANNELS);
         }
         uint32_t now = AP_HAL::micros();
         if (now - last_servo_out_us >= 2000 || AP_BoardConfig::io_dshot()) {

libraries/AP_IOMCU/iofirmware/iofirmware.cpp

@@ -966,7 +966,7 @@ bool AP_IOMCU_FW::handle_code_write()
         }
         /* copy channel data */
         uint16_t i = 0, num_values = rx_io_packet.count;
-        while ((i < IOMCU_MAX_CHANNELS) && (num_values > 0)) {
+        while ((i < IOMCU_MAX_RC_CHANNELS) && (num_values > 0)) {
             /* XXX range-check value? */
             if (rx_io_packet.regs[i] != PWM_IGNORE_THIS_CHANNEL) {
                 reg_direct_pwm.pwm[i] = rx_io_packet.regs[i];

libraries/AP_IOMCU/iofirmware/iofirmware.h

@@ -93,17 +93,17 @@ class AP_IOMCU_FW {
 
     // PAGE_SERVO values
     struct {
-        uint16_t pwm[IOMCU_MAX_CHANNELS];
+        uint16_t pwm[IOMCU_MAX_RC_CHANNELS];    // size has to account for virtual channels via SBUS_OUT
     } reg_servo;
 
     // PAGE_DIRECT_PWM values
     struct {
-        uint16_t pwm[IOMCU_MAX_CHANNELS];
+        uint16_t pwm[IOMCU_MAX_RC_CHANNELS];
     } reg_direct_pwm;
 
     // PAGE_FAILSAFE_PWM
     struct {
-        uint16_t pwm[IOMCU_MAX_CHANNELS];
+        uint16_t pwm[IOMCU_MAX_RC_CHANNELS];
     } reg_failsafe_pwm;
 
     // output rates