/**
* @brief Allocates a DMA stream.
* @details The stream is allocated and, if required, the DMA clock enabled.
* The function also enables the IRQ vector associated to the stream
* and initializes its priority.
* @pre The stream must not be already in use or an error is returned.
* @post The stream is allocated and the default ISR handler redirected
* to the specified function.
* @post The stream ISR vector is enabled and its priority configured.
* @post The stream must be freed using @p dmaStreamRelease() before it can
* be reused with another peripheral.
* @post The stream is in its post-reset state.
* @note This function can be invoked in both ISR or thread context.
*
* @param[in] dmastp pointer to a stm32_dma_stream_t structure
* @param[in] priority IRQ priority mask for the DMA stream
* @param[in] func handling function pointer, can be @p NULL
* @param[in] param a parameter to be passed to the handling function
* @return The operation status.
* @retval false no error, stream taken.
* @retval true error, stream already taken.
*
* @special
*/
bool dmaStreamAllocate(const stm32_dma_stream_t *dmastp,
uint32_t priority,
stm32_dmaisr_t func,
void *param) {
osalDbgCheck(dmastp != NULL);
/* Checks if the stream is already taken.*/
if ((dma_streams_mask & (1 << dmastp->selfindex)) != 0)
return true;
/* Marks the stream as allocated.*/
dma_isr_redir[dmastp->selfindex].dma_func = func;
dma_isr_redir[dmastp->selfindex].dma_param = param;
dma_streams_mask |= (1 << dmastp->selfindex);
/* Enabling DMA clocks required by the current streams set.*/
if ((dma_streams_mask & STM32_DMA1_STREAMS_MASK) != 0)
rccEnableDMA1(false);
#if STM32_HAS_DMA2
if ((dma_streams_mask & STM32_DMA2_STREAMS_MASK) != 0)
rccEnableDMA2(false);
#endif
/* Putting the stream in a safe state.*/
dmaStreamDisable(dmastp);
dmastp->channel->CCR = STM32_DMA_CCR_RESET_VALUE;
/* Enables the associated IRQ vector if a callback is defined.*/
if (func != NULL)
nvicEnableVector(dmastp->vector, priority);
return false;
}
/**
* @brief Allocates a DMA stream.
* @details The stream is allocated and, if required, the DMA clock enabled.
* The function also enables the IRQ vector associated to the stream
* and initializes its priority.
* @pre The stream must not be already in use or an error is returned.
* @post The stream is allocated and the default ISR handler redirected
* to the specified function.
* @post The stream ISR vector is enabled and its priority configured.
* @post The stream must be freed using @p dmaStreamRelease() before it can
* be reused with another peripheral.
* @post The stream is in its post-reset state.
* @note This function can be invoked in both ISR or thread context.
*
* @param[in] dmastp pointer to a stm32_dma_stream_t structure
* @param[in] priority IRQ priority mask for the DMA stream
* @param[in] func handling function pointer, can be @p NULL
* @param[in] param a parameter to be passed to the handling function
* @return The operation status.
* @retval FALSE no error, stream taken.
* @retval TRUE error, stream already taken.
*
* @special
*/
bool_t dmaStreamAllocate(const stm32_dma_stream_t *dmastp,
uint32_t priority,
stm32_dmaisr_t func,
void *param) {
chDbgCheck(dmastp != NULL, "dmaAllocate");
/* Checks if the stream is already taken.*/
if ((dma_streams_mask & (1 << dmastp->selfindex)) != 0)
return TRUE;
/* Marks the stream as allocated.*/
dma_isr_redir[dmastp->selfindex].dma_func = func;
dma_isr_redir[dmastp->selfindex].dma_param = param;
dma_streams_mask |= (1 << dmastp->selfindex);
/* Enabling DMA clocks required by the current streams set.*/
if ((dma_streams_mask & STM32_DMA1_STREAMS_MASK) != 0)
rccEnableDMA1(FALSE);
#if STM32_HAS_DMA2
if ((dma_streams_mask & STM32_DMA2_STREAMS_MASK) != 0)
rccEnableDMA2(FALSE);
#endif
/* Putting the stream in a safe state.*/
dmaStreamDisable(dmastp);
dmaStreamClearInterrupt(dmastp);
dmastp->channel->CCR = STM32_DMA_CCR_RESET_VALUE;
/* Enables the associated IRQ vector if a callback is defined.*/
if (func != NULL)
NVICEnableVector(dmastp->vector, CORTEX_PRIORITY_MASK(priority));
return FALSE;
}
void Lcd_t::Init() {
// ==== Backlight: Timer15 Ch2 ====
// Setup pin
PinSetupAlterFuncOutput(LCD_GPIO, LCD_BCKLT, omPushPull, ps50MHz);
// Remap Timer15 to PB14 & PB15
AFIO->MAPR2 |= 0x00000001;
// Setup timer15
rccEnableAPB2(RCC_APB2ENR_TIM15EN, false);
TIM15->CR1 = 0x01; // Enable timer
TIM15->CR2 = 0;
TIM15->PSC = 0; // Do not divide input freq
TIM15->ARR = 100; // Autoreload register: full brightness=100
TIM15->BDTR = 0xC000; // Main output Enable
TIM15->CCMR1 = 0x6000; // PWM mode1 on Ch2 enabled
TIM15->CCER = 0x0010; // Output2 enabled, polarity not inverted
BackligthValue = 0;
// ==== GPIOs ====
// Configure LCD_XRES, LCD_XCS, LCD_SCLK & LCD_SDA as Push-Pull output
InitGpios();
// ========================= Init LCD ======================================
SCLK_Lo();
XCS_Hi();
// Reset display
XRES_Lo();
chThdSleepMilliseconds(9);
XRES_Hi();
WriteCmd(0xAF); // display ON
// Reset display again
XRES_Lo();
chThdSleepMilliseconds(7);
XRES_Hi();
chThdSleepMilliseconds(7);
// Initial commands
WriteCmd(0xAF); // display ON
WriteCmd(0xA4); // Set normal display mode
WriteCmd(0x2F); // Charge pump on
WriteCmd(0x40); // Set start row address = 0
// WriteCmd(0xC8); // mirror Y axis
// WriteCmd(0xA1); // Mirror X axis
// Set x=0, y=0
WriteCmd(0xB3); // Y axis initialization
WriteCmd(0x10); // X axis initialisation1
WriteCmd(0x08); // X axis initialisation2
Cls(); // clear LCD buffer
draw_mode = OVERWRITE;
// ====================== Switch to USART + DMA ============================
#ifdef ENABLE_DMAUSART_MODE
PinSetupAlterFuncOutput(LCD_GPIO, LCD_SCLK, omPushPull, ps50MHz);
PinSetupAlterFuncOutput(LCD_GPIO, LCD_SDA, omPushPull, ps50MHz);
// Workaround hardware bug with disabled CK3 when SPI2 is enabled
SPI2->CR2 |= SPI_CR2_SSOE;
// ==== USART init ====
rccEnableUSART3(false);
// Usart clock: enabled, idle low, first edge, enable last bit pulse
// Usart itself
LCD_USART->BRR = Clk.APB1FreqHz / 100000;
LCD_USART->CR1 = USART_CR1_TE | /* Transmitter enabled */ \
USART_CR1_M; /* 9 bit */
LCD_USART->CR2 = USART_CR2_CLKEN | \
USART_CR2_LBCL;
LCD_USART->CR3 = USART_CR3_DMAT; // Enable DMA at transmitter
LCD_USART->CR1 |= USART_CR1_UE; // Enable USART
// ==== DMA ====
rccEnableDMA1();
dmaStreamAllocate(LCD_DMA, IRQ_PRIO_MEDIUM, LcdDmaCompIrq, NULL);
dmaStreamSetPeripheral(LCD_DMA, &USART3->DR);
dmaStreamSetMemory0(LCD_DMA, (uint32_t)&IBuf[0]);
dmaStreamSetMode (LCD_DMA, LCD_DMA_MODE);
// Start transmission
XCS_Lo();
// DMA_Cmd(DMA1_Channel2, ENABLE); // Enable USARTy DMA TX Channel
#else
for(int i=0; i < 864; i++) WriteData(0x00); // Clear all screen
#endif
Backlight(0);
chThdCreateStatic(waLcdThread, sizeof(waLcdThread), NORMALPRIO, (tfunc_t)LcdThread, NULL);
}
