I plan to use USART3 on the ISM43362 which uses the STM32F205 processor. I modified the platform.c and platform.h files to include the correct pins, interrupts, DMA channels and streams. I also had to update the interrupt priorities function:
void platform_init_peripheral_irq_priorities( void )
{
/* Interrupt priority setup. Called by WICED/platform/MCU/STM32F2xx/platform_init.c */
NVIC_SetPriority( RTC_WKUP_IRQn , 1 ); /* RTC Wake-up event */
NVIC_SetPriority( SDIO_IRQn , 2 ); /* WLAN SDIO */
NVIC_SetPriority( DMA2_Stream3_IRQn, 3 ); /* WLAN SDIO DMA */
NVIC_SetPriority( DMA1_Stream3_IRQn, 3 ); /* WLAN SPI DMA */
NVIC_SetPriority( USART1_IRQn , 6 ); /* WICED_UART_1 */
NVIC_SetPriority( USART2_IRQn , 6 ); /* WICED_UART_2 */
NVIC_SetPriority( USART3_IRQn , 6 ); /* WICED_UART_2 */
NVIC_SetPriority( DMA2_Stream7_IRQn, 7 ); /* WICED_UART_1 TX DMA */
NVIC_SetPriority( DMA2_Stream2_IRQn, 7 ); /* WICED_UART_1 RX DMA */
NVIC_SetPriority( DMA1_Stream6_IRQn, 7 ); /* WICED_UART_2 TX DMA */
NVIC_SetPriority( DMA1_Stream5_IRQn, 7 ); /* WICED_UART_2 RX DMA */
NVIC_SetPriority( DMA1_Stream3_IRQn, 7 ); /* WICED_UART_3 TX DMA */
NVIC_SetPriority( DMA1_Stream1_IRQn, 7 ); /* WICED_UART_3 RX DMA */
NVIC_SetPriority( EXTI0_IRQn , 14 ); /* GPIO */
NVIC_SetPriority( EXTI1_IRQn , 14 ); /* GPIO */
NVIC_SetPriority( EXTI2_IRQn , 14 ); /* GPIO */
NVIC_SetPriority( EXTI3_IRQn , 14 ); /* GPIO */
NVIC_SetPriority( EXTI4_IRQn , 14 ); /* GPIO */
NVIC_SetPriority( EXTI9_5_IRQn , 14 ); /* GPIO */
NVIC_SetPriority( EXTI15_10_IRQn , 14 ); /* GPIO */
}
I noticed that the entry for SPI DMA is DMA1_Stream3 and this is not correct for SPI1. SPI1_RX is on DMA2_Stream0. I compared this function to that of BCD943362 which is a similar module and the interrupt priorities are the same.
I would ask anyone more familiar with the STM32F205 to review and let me know the correct entry. If it is correct as is, then I need to decide if it is priority 3 or 7 since USART3 uses that same DMA and stream but different channel.
Thanks,
Tom
