avr/motor_ctrl: Disable engines after 1s off inativity

[ros_wild_thumper.git] / avr / motor_ctrl / main.c

diff --git a/avr/motor_ctrl/main.c b/avr/motor_ctrl/main.c
index ec9965f68800c26812a9eadf04da5e67dd3cec81..b0d9cbfe00aba102cc72ce4f82173b5eefa30eac 100644 (file)
--- a/avr/motor_ctrl/main.c
+++ b/avr/motor_ctrl/main.c
@@ -113,6 +113,7 @@
 #define WHEEL_DIST 0.39912 // Measured: 0.252
 #define PWM_BREAK INT16_MIN
 #define STALL_LIMIT 140000
+#define I2C_TIMEOUT_DISABLE 255
 
 #define TWI_ACK   TWCR = (1<<TWINT) | (1<<TWEA) | (1<<TWEN) | (1<<TWIE)
 #define TWI_NAK   TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE)
@@ -183,6 +184,7 @@ static volatile uint8_t count_test=0;
 static volatile uint8_t front_handicap=0;
 static volatile uint8_t aft_handicap=0;
 static volatile uint8_t error_state=0;
+static volatile uint8_t last_man_update_count=I2C_TIMEOUT_DISABLE;
 
 ISR(TWI_vect)
 {
@@ -349,6 +351,7 @@ ISR(TWI_vect)
                                        tmp_angle.i = tmp_angle.i << 8 | TWDR;
                                        cmd_vel.angle = tmp_angle.f;
                                        cmd_vel.bUpdate = 1;
+                                       last_man_update_count = 0;
                                        TWI_ACK;
                                        break;
                                case 0x90: // Motor 1 switch
@@ -1144,6 +1147,15 @@ int main(void) {
                        update_pid();
                        update_motor();
                        count_test++;
+                       if (last_man_update_count != I2C_TIMEOUT_DISABLE) last_man_update_count++;
+
+                       if (last_man_update_count > 100) {
+                               // ~1s without a new i2c command
+                               cmd_vel.speed = 0;
+                               cmd_vel.angle = 0;
+                               cmd_vel.bUpdate = 1;
+                               last_man_update_count = I2C_TIMEOUT_DISABLE;
+                       }
                }
 
                sleep_mode();