From 6f418fc1b068c1a41113bb2b019a5803765e1deb Mon Sep 17 00:00:00 2001
From: Dave Hylands
Date: Tue, 22 Jul 2014 07:57:36 -0700
Subject: Add support for selecting pin alternate functions from python.

Converts generted pins to use qstrs instead of string pointers.

This patch also adds the following functions:
pyb.Pin.names()
pyb.Pin.af_list()
pyb.Pin.gpio()

dir(pyb.Pin.board) and dir(pyb.Pin.cpu) also produce useful results.

pyb.Pin now takes kw args.

pyb.Pin.__str__ now prints more useful information about the pin
configuration.

I found the following functions in my boot.py to be useful:
```python
def pins():
    for pin_name in dir(pyb.Pin.board):
        pin = pyb.Pin(pin_name)
        print('{:10s} {:s}'.format(pin_name, str(pin)))

def af():
    for pin_name in dir(pyb.Pin.board):
        pin = pyb.Pin(pin_name)
        print('{:10s} {:s}'.format(pin_name, str(pin.af_list())))
```
---
 teensy/hal_gpio.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

(limited to 'teensy/hal_gpio.c')

diff --git a/teensy/hal_gpio.c b/teensy/hal_gpio.c
index 0811f76fd..218560e29 100644
--- a/teensy/hal_gpio.c
+++ b/teensy/hal_gpio.c
@@ -25,12 +25,18 @@ void HAL_GPIO_Init(GPIO_TypeDef *GPIOx, GPIO_InitTypeDef *GPIO_Init)
         if ((GPIO_Init->Mode == GPIO_MODE_AF_PP) || (GPIO_Init->Mode == GPIO_MODE_AF_OD)) {
             /* Check the Alternate function parameter */
             assert_param(IS_GPIO_AF(GPIO_Init->Alternate));
-            /* Configure Alternate function mapped with the current IO */
-
-            *port_pcr &= ~PORT_PCR_MUX_MASK;
-            *port_pcr |= PORT_PCR_MUX(GPIO_Init->Alternate);
+        }
+        else if (GPIO_Init->Mode == GPIO_MODE_ANALOG) {
+            GPIO_Init->Alternate = 0;
+        }
+        else {
+            GPIO_Init->Alternate = 1;
         }
 
+        /* Configure Alternate function mapped with the current IO */
+        *port_pcr &= ~PORT_PCR_MUX_MASK;
+        *port_pcr |= PORT_PCR_MUX(GPIO_Init->Alternate);
+
         /* Configure IO Direction mode (Input, Output, Alternate or Analog) */
         if (GPIO_Init->Mode == GPIO_MODE_INPUT || GPIO_Init->Mode == GPIO_MODE_ANALOG) {
             GPIOx->PDDR &= ~bitmask;
@@ -112,4 +118,3 @@ void HAL_GPIO_Init(GPIO_TypeDef *GPIOx, GPIO_InitTypeDef *GPIO_Init)
 #endif
     }
 }
-
-- 
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