From cba9561e89c833b8151bf0439400ed5a9fd14ff8 Mon Sep 17 00:00:00 2001 From: Ken Sarkies Date: Mon, 9 Jul 2012 16:54:01 +0930 Subject: NVIC_Set_Interrupt_Priority: change to use 4-bit fields. (viz STM32F10xxx Cortex-M3 programming manual PM0056 and Cortex-M3-Generic-User-Guide.pdf) Doxygen commentary added --- lib/stm32/nvic.c | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 99 insertions(+), 2 deletions(-) (limited to 'lib/stm32') diff --git a/lib/stm32/nvic.c b/lib/stm32/nvic.c index c9cf48b..ae91bff 100644 --- a/lib/stm32/nvic.c +++ b/lib/stm32/nvic.c @@ -1,3 +1,25 @@ +/** @file + +@ingroup STM32F + +@brief libopencm3 STM32F Nested Vectored Interrupt Controller + +@version 1.0.0 + +@author @htmlonly © @endhtmlonly 2010 Thomas Otto +@author @htmlonly © @endhtmlonly 2012 Fergus Noble + +@date 7 July 2012 + +The STM32F series provides up to 68 maskable user interrupts for the STM32F10x +series, and 87 for the STM32F2xx and STM32F4xx series. + +The NVIC registers are defined by the ARM standards +@see Cortex-M3 Devices Generic User Guide + + +LGPL License Terms @ref lgpl_license +*/ /* * This file is part of the libopencm3 project. * @@ -20,47 +42,122 @@ #include +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Enable Interrupt + +Enables a user interrupt. + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +*/ + void nvic_enable_irq(u8 irqn) { NVIC_ISER(irqn / 32) = (1 << (irqn % 32)); } +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Disable Interrupt + +Disables a user interrupt. + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +*/ + void nvic_disable_irq(u8 irqn) { NVIC_ICER(irqn / 32) = (1 << (irqn % 32)); } +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Return Pending Interrupt + +True if the interrupt has occurred and is waiting for service. + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +@return Boolean. Interrupt pending. +*/ + u8 nvic_get_pending_irq(u8 irqn) { return NVIC_ISPR(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0; } +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Set Pending Interrupt + +Force a user interrupt to a pending state. No effect if the interrupt is already +pending. + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +*/ + void nvic_set_pending_irq(u8 irqn) { NVIC_ISPR(irqn / 32) = (1 << (irqn % 32)); } +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Clear Pending Interrupt + +Force remove a user interrupt from a pending state. No effect if the interrupt is +actively being serviced. + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +*/ + void nvic_clear_pending_irq(u8 irqn) { NVIC_ICPR(irqn / 32) = (1 << (irqn % 32)); } +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Return Active Interrupt + +Interrupt has occurred and is currently being serviced. + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +@return Boolean. Interrupt active. +*/ + u8 nvic_get_active_irq(u8 irqn) { return NVIC_IABR(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0; } +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Return Enabled Interrupt + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +@return Boolean. Interrupt enabled. +*/ + u8 nvic_get_irq_enabled(u8 irqn) { return NVIC_ISER(irqn / 32) & (1 << (irqn % 32)) ? 1 : 0; } +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Set Interrupt Priority + +@param[in] irqn Unsigned int8. Interrupt number @ref nvic_stn32f1_userint +@param[in] priority Unsigned int8. Interrupt priority (0 ... 255) +*/ + void nvic_set_priority(u8 irqn, u8 priority) { - NVIC_IPR(irqn) = priority; + NVIC_IPR(irqn / 4) = ((priority << ((irqn % 4) * 8)); } -void nvic_generate_software_interrupt(u8 irqn) +/*-----------------------------------------------------------------------------*/ +/** @brief NVIC Software Trigger Interrupt + +Generate an interrupt from software. This has no effect for unprivileged access +unless the privilege level has been elevated through the System Control Registers. + +@param[in] sgin Unsigned int16. Interrupt number (0 ... 239) +*/ + +void nvic_generate_software_interrupt(u16 irqn) { if (irqn <= 239) NVIC_STIR |= irqn; -- cgit v1.2.3