Hello, I am using a NUCLEO-H7A3ZI-Q to send and receive packets over serial. I have a varying payload size, so I am using: HAL_UARTEx_ReceiveToIdle_DMA(&huart3, rx_buffer, 4096); as this searches for an idle at the end of the frame to begin processing this data.
To process this data and copy it into a look up table (LUT) capable of being 0-4096 bytes long I have this following script; which comprises two uint8_t into one uint16_t to be represented by a 12-bit DAC, hence the clipping if they exceed 0FFF (4095).
This receives and writes perfectly up to 512 bytes of memory (256 uint16_t within the LUT), however above this all remaining values in the LUT are left unpopulated.
uint16_t length = 0;
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t size){
if (lut != NULL) {
HAL_DAC_Stop_DMA(&hdac1, DAC_CHANNEL_1);
free (lut);
lut = NULL;
}
if(rx_buffer[0] == 0XAA) {
length = rx_buffer[2] | (rx_buffer[1] <<8);
frame_rate = rx_buffer[3];
mode = rx_buffer[4];
if (mode >=3){
mode = 0;
}
uint16_t receive = __HAL_DMA_GET_COUNTER(huart3.hdmarx);
if (receive >= length + 5) {
lut = malloc ((length/2)*sizeof(uint16_t));
for (uint16_t k = 0, i = 5; i < length + 5; ++k, i += 2){
lut[k] = (rx_buffer[i+1] | rx_buffer[i] << 8);
if (lut[k] >= 4095) {
lut[k] = 4095;
}
}
}
mode_init = 0;
HAL_StatusTypeDef status = HAL_UART_Transmit_DMA(&huart3, lut, length);
}
HAL_UARTEx_ReceiveToIdle_DMA(&huart3, rx_buffer, 4096);
}
I have tried moving the DMA ram address to 0x3 and the rx_buffer appears to be populating fully, however this is not being transfered to the LUT
.RxDmaSection :
{
KEEP(*(.RxDmaSection))
} > RAM_CD
Edited to apply source code formatting - please see How to insert source code for future reference.
