EMTime/libopencm3-examples
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

lm4f: Update examples to the new GPIO API

Browse Source 
We updated the GPIO API to use the AHB bus; however the AHP aperture for
GPIO ports A through J needs to be explicitly enabled at runtime. Accessing
the AHB aperture otherwise hardfaults.

To make the examples work again, we call gpio_enable_ahb_aperture() at the
start of main().

Since we're at it, we also take out the ugly register accesses in favor
of the new gpio functions.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Alexandru Gagniuc
2013-05-17 19:55:08 -05:00
parent 3758ce779f
commit adddf9e418
3 changed files with 22 additions and 39 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
examples/lm4f/stellaris-ek-lm4f120xl/miniblink/miniblink.c
View File

@@ -95,8 +95,8 @@ static void gpio_setup(void)
periph_clock_enable(RCC_GPIOF);
const u32 outpins = (LED_R | LED_G | LED_B);
GPIO_DIR(RGB_PORT) |= outpins; /* Configure outputs. */
GPIO_DEN(RGB_PORT) |= outpins; /* Enable digital function on outputs. */
gpio_mode_setup(RGB_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, outpins);
gpio_set_output_config(RGB_PORT, GPIO_OTYPE_PP, GPIO_DRIVE_2MA, outpins);
/*
* Now take care of our buttons
@@ -104,20 +104,12 @@ static void gpio_setup(void)
const u32 btnpins = USR_SW1 | USR_SW2;
/*
* PF0 is locked by default. We need to unlock the GPIO_CR register,
* then enable PF0 commit. After we do this, we can setup PF0. If we
* don't do this, any configuration done to PF0 is lost, and we will not
* have a PF0 interrupt.
* PF0 is a locked by default. We need to unlock it before we can
* re-purpose it as a GPIO pin.
*/
GPIO_LOCK(GPIOF) = 0x4C4F434B;
GPIO_CR(GPIOF) |= USR_SW2;
/* Configure pins as inputs. */
GPIO_DIR(GPIOF) &= ~btnpins;
/* Enable digital function on the pins. */
GPIO_DEN(GPIOF) |= btnpins;
/* Pull-up the pins. We don't have an external pull-up */
GPIO_PUR(GPIOF) |= btnpins;
gpio_unlock_commit(GPIOF, USR_SW2);
/* Configure pins as inputs, with pull-up. */
gpio_mode_setup(GPIOF, GPIO_MODE_INPUT, GPIO_PUPD_PULLUP, btnpins);
}
/*
@@ -127,14 +119,10 @@ static void gpio_setup(void)
static void irq_setup(void)
{
const u32 btnpins = USR_SW1 | USR_SW2;
/* Configure interrupt as edge-sensitive */
GPIO_IS(GPIOF) &= ~btnpins;
/* Interrupt only respond to rising or falling edge (single-edge) */
GPIO_IBE(GPIOF) &= ~btnpins;
/* Trigger interrupt on rising-edge (when button is depressed) */
GPIO_IEV(GPIOF) |= btnpins;
gpio_configure_trigger(GPIOF, GPIO_TRIG_EDGE_RISE, btnpins);
/* Finally, Enable interrupt */
GPIO_IM(GPIOF) |= btnpins;
gpio_enable_interrupts(GPIOF, btnpins);
/* Enable the interrupt in the NVIC as well */
nvic_enable_irq(NVIC_GPIOF_IRQ);
}
@@ -149,6 +137,7 @@ static void delay(void)
int main(void)
{
gpio_enable_ahb_aperture();
clock_setup();
gpio_setup();
irq_setup();
@@ -185,7 +174,7 @@ int main(void)
void gpiof_isr(void)
{
if (GPIO_RIS(GPIOF) & USR_SW1) {
if (gpio_is_interrupt_source(GPIOF, USR_SW1)) {
/* SW1 was just depressed */
bypass = !bypass;
if (bypass) {
@@ -201,10 +190,10 @@ void gpiof_isr(void)
rcc_change_pll_divisor(plldiv[ipll]);
}
/* Clear interrupt source */
GPIO_ICR(GPIOF) = USR_SW1;
gpio_clear_interrupt_flag(GPIOF, USR_SW1);
}
if (GPIO_RIS(GPIOF) & USR_SW2) {
if (gpio_is_interrupt_source(GPIOF, USR_SW2)) {
/* SW2 was just depressed */
if (!bypass) {
if (plldiv[++ipll] == 0)
@@ -212,6 +201,6 @@ void gpiof_isr(void)
rcc_change_pll_divisor(plldiv[ipll]);
}
/* Clear interrupt source */
GPIO_ICR(GPIOF) = USR_SW2;
gpio_clear_interrupt_flag(GPIOF, USR_SW2);
}
}

9
examples/lm4f/stellaris-ek-lm4f120xl/uart_echo_interrupt/uart_echo_interrupt.c
View File

@@ -25,14 +25,10 @@
static void uart_setup(void)
{
u32 pins;
/* Enable GPIOA in run mode. */
periph_clock_enable(RCC_GPIOA);
/* Configure PA0 and PA1 as alternate function pins */
pins = GPIO0 | GPIO1;
GPIO_AFSEL(GPIOA) |= pins;
GPIO_DEN(GPIOA) |= pins;
/* PA0 and PA1 are muxed to UART0 during power on, by default */
/* Mux PA0 and PA1 to UART0 (alternate function 1) */
gpio_set_af(GPIOA, 1, GPIO0 | GPIO1);
/* Enable the UART clock */
periph_clock_enable(RCC_UART0);
@@ -79,6 +75,7 @@ void uart0_isr(void)
int main(void)
{
gpio_enable_ahb_aperture();
uart_setup();
uart_irq_setup();

11
examples/lm4f/stellaris-ek-lm4f120xl/uart_echo_simple/uart_echo_simple.c
View File

@@ -24,14 +24,10 @@
static void uart_setup(void)
{
u32 pins;
/* Enable GPIOA in run mode. */
periph_clock_enable(RCC_GPIOA);
/* Configure PA0 and PA1 as alternate function pins */
pins = GPIO0 | GPIO1;
GPIO_AFSEL(GPIOA) |= pins;
GPIO_DEN(GPIOA) |= pins;
/* PA0 and PA1 are muxed to UART0 during power on, by default */
/* Mux PA0 and PA1 to UART0 (alternate function 1) */
gpio_set_af(GPIOA, 1, GPIO0 | GPIO1);
/* Enable the UART clock */
periph_clock_enable(RCC_UART0);
@@ -54,7 +50,8 @@ static void uart_setup(void)
int main(void)
{
u8 rx;
gpio_enable_ahb_aperture();
uart_setup();
/*