yefj
Advanced Member level 4
Hello,I am trying to communicate with SPI device as you can see bellow.
I put in endless loop the process of sending commands and getting response.
At first i send commands and then i expect to get 8 bit response.
but when i put the following line RxBuffer=USART_Rx(USART1); after the TX command.
I get zero data sent from my device .
Why my RxBuffer=USART_Rx(USART1); blocking the TX commands?
Thanks.
I put in endless loop the process of sending commands and getting response.
At first i send commands and then i expect to get 8 bit response.
but when i put the following line RxBuffer=USART_Rx(USART1); after the TX command.
I get zero data sent from my device .
Why my RxBuffer=USART_Rx(USART1); blocking the TX commands?
Thanks.
Code:
/**************************************************************************//**
* @main_series1_PG1_EFR.c
* @brief Demonstrates USART1 as SPI master.
* @version 0.0.2
******************************************************************************
* @section License
* <b>Copyright 2018 Silicon Labs, Inc. http://www.silabs.com</b>
*******************************************************************************
*
* This file is licensed under the Silabs License Agreement. See the file
* "Silabs_License_Agreement.txt" for details. Before using this software for
* any purpose, you must agree to the terms of that agreement.
*
******************************************************************************/
#include <stdint.h>
#include <stdbool.h>
#include "bsp.h"
#include "bsp_trace.h"
#include "em_emu.h"
#include "em_device.h"
#include "em_chip.h"
#include "em_cmu.h"
#include "em_gpio.h"
#include "em_usart.h"
#include "em_ldma.h"
#define TX_WREN_BUFFER_SIZE 1
#define TX_WRITE_BUFFER_SIZE 5
#define TX_READ_BUFFER_SIZE 4
#define RX_BUFFER_SIZE 1
uint8_t Tx_WREN[TX_WREN_BUFFER_SIZE] = {0x06};//write enable command
uint8_t Tx_CHIP_ERASE[TX_WREN_BUFFER_SIZE] = {0xC7};//Chip Erase
uint8_t Tx_READ_STATUS[TX_WREN_BUFFER_SIZE] = {0x05};//read status
uint8_t Tx_PP[TX_WRITE_BUFFER_SIZE] = {0x02,0x00,0x00,0x00,0xE6}; //write to all zero register the value EF
uint8_t Tx_READ[TX_READ_BUFFER_SIZE] = {0x03,0x00,0x00,0x00}; //read register 00,00,00,00
uint32_t TxBufferIndex = 0;
uint8_t RxBuffer;
//uint32_t RxBufferIndex = 0;
volatile uint32_t msTicks; /* counts 1ms timeTicks */
void Delay(uint32_t dlyTicks);
void SysTick_Handler(void)
{
msTicks++; /* increment counter necessary in Delay()*/
}
void Delay(uint32_t dlyTicks)
{
uint32_t curTicks;
curTicks = msTicks;
while ((msTicks - curTicks) < dlyTicks) ;
}
int main(void)
{
int i;
CHIP_Init();
CMU_ClockEnable(cmuClock_GPIO, true);
CMU_ClockEnable(cmuClock_USART1, true);
CMU_ClockEnable(cmuClock_USART0, true);
// Configure GPIO mode
GPIO_PinModeSet(gpioPortC, 8, gpioModePushPull, 0); // US1_CLK is push pull
GPIO_PinModeSet(gpioPortA, 4, gpioModePushPull, 1); // US1_CS is push pull
GPIO_PinModeSet(gpioPortA, 5, gpioModePushPull, 1); // delay gpi
GPIO_PinModeSet(gpioPortC, 6, gpioModePushPull, 1); // US1_TX (MOSI) is push pull
GPIO_PinModeSet(gpioPortC, 7, gpioModeInput, 1); // US1_RX (MISO) is input
// Start with default config, then modify as necessary
USART_InitSync_TypeDef config = USART_INITSYNC_DEFAULT;
config.master = true; // master mode
config.baudrate = 1000000; // CLK freq is 1 MHz
config.autoCsEnable = false; // CS pin controlled by firmware, not hardware
config.clockMode = usartClockMode0; // clock idle low, sample on rising/first edge
config.msbf = true; // send MSB first
config.enable = usartDisable; // Make sure to keep USART disabled until it's all set up
USART_InitSync(USART1, &config);
USART_InitAsync_TypeDef init = USART_INITASYNC_DEFAULT;
// set pin modes for UART TX and RX pins
GPIO_PinModeSet(gpioPortA, 1, gpioModeInput, 1);
GPIO_PinModeSet(gpioPortA, 0, gpioModePushPull, 1);
///////////////////////////////////
USART_InitAsync(USART0, &init);
USART0->ROUTELOC0 =(USART_ROUTELOC0_TXLOC_LOC0) | // US1_TX (MOSI) on location 11 = PC6 per datasheet section 6.4 = EXP Header pin 4
(USART_ROUTELOC0_RXLOC_LOC0); // US1_RX (MISO) on location 11 = PC7 per datasheet section 6.4 = EXP Header pin 6
// Set USART pin locations
USART1->ROUTELOC0 = (USART_ROUTELOC0_CLKLOC_LOC11) | // US1_CLK on location 11 = PC8
(USART_ROUTELOC0_CSLOC_LOC11) | // US1_CS Manual
(USART_ROUTELOC0_TXLOC_LOC11) | // US1_TX (MOSI) on location 11 = PC6
(USART_ROUTELOC0_RXLOC_LOC11); // US1_RX (MISO) on location 11 = PC7
// Enable USART pins
USART1->ROUTEPEN = USART_ROUTEPEN_CLKPEN | USART_ROUTEPEN_TXPEN | USART_ROUTEPEN_RXPEN;
// Enable USART1
USART_Enable(USART1, usartEnable);
TxBufferIndex = 0;
if (SysTick_Config(CMU_ClockFreqGet(cmuClock_CORE) / 1000)) {
while (1) ;
}
while(1)
{
for(i=0;i<200;i++)
{
GPIO_PinOutSet(gpioPortA,5);
GPIO_PinOutClear(gpioPortA,5);
}
GPIO_PinOutClear(gpioPortA,4);
USART_SpiTransfer(USART1,Tx_WREN[0]);
GPIO_PinOutSet(gpioPortA,4);
for(i=0;i<10;i++)
{
GPIO_PinOutSet(gpioPortA,5);
GPIO_PinOutClear(gpioPortA,5);
}
GPIO_PinOutClear(gpioPortA,4);
USART_SpiTransfer(USART1,Tx_READ_STATUS[0]);
GPIO_PinOutSet(gpioPortA,4);
RxBuffer=USART_Rx(USART1);
}//end while(1)
}
