fix: UART DMA REQUEST

Author: HalfSweet

src/fw/board/boards/board_em_lb525.c

@@ -29,12 +29,12 @@
 #define UART_INST USART1
 #define UART_TX PAD_PA19
 #define UART_RX PAD_PA18
-#define UART_DMAREQ DMA_REQUEST_4
+#define UART_DMAREQ DMA_REQUEST_5
 #else
 #define UART_INST USART3
 #define UART_TX PAD_PA20
 #define UART_RX PAD_PA27
-#define UART_DMAREQ DMA_REQUEST_7
+#define UART_DMAREQ DMA_REQUEST_27
 #endif
 
 static UARTDeviceState s_dbg_uart_state;

src/fw/drivers/sf32lb/uart.c

@@ -303,7 +303,7 @@ void uart_irq_handler(UARTDevice *dev) {
         recv_len += dma_length;
       }
 
-      for (uint32_t i = 0; i < recv_len; i++) {
+      for (int32_t i = 0; i < recv_len; i++) {
         const uint8_t data = dev->state->rx_dma_buffer[dev->state->rx_dma_index + i];
         if (dev->state->rx_irq_handler(dev, data, &err_flags)) {
           should_context_switch = true;