drv/ioport/ioport_lpf2: move port power enable

This moves the port VCC (pin 4) power management from platform.c to the
LPF2 I/O port driver. This way, the driver can manage shutting down the
I/O ports on power off.

Author: dlech

lib/pbio/drv/ioport/ioport_lpf2.c

@@ -444,6 +444,20 @@ static PT_THREAD(poll_dcm(ioport_dev_t * ioport)) {
 PROCESS_THREAD(pbdrv_ioport_lpf2_process, ev, data) {
     static struct etimer timer;
 
+    PROCESS_EXITHANDLER({
+        // make sure all pins are set to input so they aren't supplying power
+        // to the I/O device.
+        for (int i = 0; i < PBDRV_CONFIG_IOPORT_LPF2_NUM_PORTS; i++) {
+            init_one(i);
+        }
+
+        // TODO: we need to ensure H-bridge power is off here to avoid potentially
+        // damaging custom I/O devices.
+
+        // Turn off power on pin 4 on all ports
+        pbdrv_gpio_out_low(&pbdrv_ioport_lpf2_platform_data.port_vcc);
+    });
+
     PROCESS_BEGIN();
 
     etimer_set(&timer, clock_from_msec(2));
@@ -452,7 +466,10 @@ PROCESS_THREAD(pbdrv_ioport_lpf2_process, ev, data) {
         init_one(i);
     }
 
-    while (true) {
+    // Turn on power on pin 4 on all ports
+    pbdrv_gpio_out_high(&pbdrv_ioport_lpf2_platform_data.port_vcc);
+
+    for (;;) {
         PROCESS_WAIT_EVENT();
 
         // If pbio_uartdev_process tells us the uart device was removed, reset

lib/pbio/platform/city_hub/platform.c

@@ -232,14 +232,10 @@ void SystemInit(void) {
         | RCC_APB1ENR_USART4EN;
     RCC->APB2ENR |= RCC_APB2ENR_SYSCFGCOMPEN | RCC_APB2ENR_TIM16EN | RCC_APB2ENR_TIM15EN;
 
-    // Keep main power on
+    // Keep main power on (PB11)
     GPIOB->MODER = (GPIOB->MODER & ~GPIO_MODER_MODER11_Msk) | (1 << GPIO_MODER_MODER11_Pos);
     GPIOB->BSRR = GPIO_BSRR_BS_11;
 
-    // Turn on port VCC
-    GPIOB->MODER = (GPIOB->MODER & ~GPIO_MODER_MODER2_Msk) | (1 << GPIO_MODER_MODER2_Pos);
-    GPIOB->BSRR = GPIO_BSRR_BS_2;
-
     // Unused pins
 
     // PA5 output, low

lib/pbio/platform/move_hub/platform.c

@@ -284,14 +284,10 @@ void SystemInit(void) {
     RCC->APB2ENR |= RCC_APB2ENR_SYSCFGCOMPEN | RCC_APB2ENR_TIM1EN
         | RCC_APB2ENR_TIM15EN | RCC_APB2ENR_TIM16EN;
 
-    // Keep BOOST alive
+    // Keep main power on (PB11)
     GPIOB->BSRR = GPIO_BSRR_BS_11;
     GPIOB->MODER = (GPIOB->MODER & ~GPIO_MODER_MODER11_Msk) | (1 << GPIO_MODER_MODER11_Pos);
 
-    // PB2 controls I/O port VCC
-    GPIOB->BSRR = GPIO_BSRR_BS_2;
-    GPIOB->MODER = (GPIOB->MODER & ~GPIO_MODER_MODER2_Msk) | (1 << GPIO_MODER_MODER2_Pos);
-
     // Unused pins
 
     // PF0 output, high

lib/pbio/platform/prime_hub/dual_boot.c

@@ -51,7 +51,7 @@ static bool check_for_long_press(void) {
     __HAL_RCC_GPIOB_CLK_ENABLE();
     __HAL_RCC_GPIOC_CLK_ENABLE();
 
-    // Keep main power on (PA13 == POWER_EN)
+    // Keep main power on (PA13)
     GPIOA->BSRR = GPIO_BSRR_BS_13;
     GPIOA->MODER = (GPIOA->MODER & ~GPIO_MODER_MODER13_Msk) | (1 << GPIO_MODER_MODER13_Pos);
 

lib/pbio/platform/prime_hub/platform.c

@@ -734,11 +734,7 @@ void SystemInit(void) {
         RCC_APB2ENR_UART10EN | RCC_APB2ENR_ADC1EN | RCC_APB2ENR_SPI1EN | RCC_APB2ENR_SYSCFGEN;
     RCC->AHB2ENR |= RCC_AHB2ENR_OTGFSEN;
 
-    // Keep main power on (PA13 == POWER_EN)
+    // Keep main power on (PA13)
     GPIOA->BSRR = GPIO_BSRR_BS_13;
     GPIOA->MODER = (GPIOA->MODER & ~GPIO_MODER_MODER13_Msk) | (1 << GPIO_MODER_MODER13_Pos);
-
-    // Turn VCC_PORT on (PA14 == PORTCE)
-    GPIOA->BSRR = GPIO_BSRR_BS_14;
-    GPIOA->MODER = (GPIOA->MODER & ~GPIO_MODER_MODER14_Msk) | (1 << GPIO_MODER_MODER14_Pos);
 }

lib/pbio/platform/technic_hub/platform.c

@@ -506,8 +506,4 @@ void SystemInit(void) {
     gpio_init.Mode = GPIO_MODE_OUTPUT_PP;
     HAL_GPIO_WritePin(GPIOC, GPIO_PIN_12, GPIO_PIN_SET);
     HAL_GPIO_Init(GPIOC, &gpio_init);
-
-    // Turn VCC_PORT on (PB12)
-    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
-    HAL_GPIO_Init(GPIOB, &gpio_init);
 }