[elektro] STM32F103 SPI1 vs SPI2

[uprogc .]

Talan SPI eseten:

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);





2018-01-15 17:09 GMT+02:00 uprogc . <uprogc at gmail.com>:

> En ugyan nem olvastam vegig a kodot, de megfeleloen be van allitva az
> orajele az adott SPInek ?
>
> 2018-01-15 15:56 GMT+02:00 Peter Peterb <peterb.list at gmail.com>:
>
>> Sziasztok,
>>
>> Hátha van itt valaki, aki benne van a témában és szemet szúr neki
>> valami, ami nekem már végképp nem. Az alábbi teszt kód szerint az SPI2
>> működik ahogy kell, az SPI1 viszont rögtön végtelen ciklusba kerül a
>> TXE flag vizsgálatán. Ennek a reset utáni alapállapota 1, de a
>> debugger szerint az SPI1_SR=0, azaz a TXE bit is 0, mintha már lenne a
>> TX bufferben valami.
>> Ha ezt a vizsgálatot kihagyom, vagy ha a ...TXE == RESET helyett
>> ...BSY == SET van, akkor ugyan átmegy rajta, de akkor se csinál
>> semmit, a CLK és MOSI folyamatosan 0-n van. Sima GPIO-nak konfigurálva
>> piszkálhatók a lábak, tehát a chip kifelé rendben van.
>>
>> Üdv,
>> Péter
>>
>> #include "stm32f10x.h"
>> #include "stm32f10x_rcc.h"
>> #include "stm32f10x_gpio.h"
>> #include "stm32f10x.h"
>> #include "delay.h"
>>
>> //-----------------------------------------------------------------
>> #define TEST_SPI        1
>> //-----------------------------------------------------------------
>>
>> #if (TEST_SPI == 1)
>> #define SPIy            SPI1
>> #define SPIy_CLK        RCC_APB2Periph_SPI1
>> #define SPIy_GPIO       GPIOA
>> #define SPIy_GPIO_CLK   RCC_APB2Periph_GPIOA
>> #define SPIy_PIN_NSS    GPIO_Pin_4
>> #define SPIy_PIN_SCK    GPIO_Pin_5
>> #define SPIy_PIN_MISO   GPIO_Pin_6
>> #define SPIy_PIN_MOSI   GPIO_Pin_7
>>
>> #elif (TEST_SPI == 2)
>> #define SPIy            SPI2
>> #define SPIy_CLK        RCC_APB1Periph_SPI2
>> #define SPIy_GPIO       GPIOB
>> #define SPIy_GPIO_CLK   RCC_APB2Periph_GPIOB
>> #define SPIy_PIN_NSS    GPIO_Pin_12
>> #define SPIy_PIN_SCK    GPIO_Pin_13
>> #define SPIy_PIN_MISO   GPIO_Pin_14
>> #define SPIy_PIN_MOSI   GPIO_Pin_15
>>
>> #else
>> #error Not a valid SPI port number!
>> #endif
>>
>> int main(void)
>> {
>>     SPI_InitTypeDef     SPI_InitStructure;
>>     GPIO_InitTypeDef    GPIO_InitStructure;
>>
>>     //-----------------------------------------------------------------
>>     // System clocks configuration
>>     // First set flash latency:
>>     //  0...24 MHz ---> 0
>>     // 24...48 MHz ---> 1
>>     // 48...72 MHz ---> 2
>>     FLASH_SetLatency(FLASH_Latency_1);
>>
>>     RCC_PLLConfig(RCC_PLLSource_HSI_Div2, RCC_PLLMul_9); // HSI, 36 MHz
>>     RCC_PLLCmd(ENABLE); // Enable PLL
>>     while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {} // Wait till
>> PLL stable
>>     RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
>>
>>     RCC_HCLKConfig(RCC_SYSCLK_Div1);
>>     RCC_PCLK1Config(RCC_HCLK_Div2);
>>     RCC_PCLK2Config(RCC_HCLK_Div2);
>>
>>     RCC_APB2PeriphClockCmd(SPIy_GPIO_CLK | RCC_APB2Periph_AFIO,
>> ENABLE); // Enable GPIO clock for SPIy
>>     RCC_APB1PeriphClockCmd(SPIy_CLK, ENABLE); // Enable SPIy Periph clock
>>
>>     //-----------------------------------------------------------------
>>     // GPIO configuration
>>     GPIO_InitStructure.GPIO_Pin = SPIy_PIN_SCK | SPIy_PIN_MOSI;
>>     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
>>     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
>>     GPIO_Init(SPIy_GPIO, &GPIO_InitStructure);
>>
>>     GPIO_InitStructure.GPIO_Pin = SPIy_PIN_MISO;
>>     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
>>     GPIO_Init(SPIy_GPIO, &GPIO_InitStructure);
>>
>>     GPIO_InitStructure.GPIO_Pin = SPIy_PIN_NSS;
>>     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
>>     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
>>     GPIO_Init(SPIy_GPIO, &GPIO_InitStructure);
>>
>>     //-----------------------------------------------------------------
>>     // SPIy configuration
>>
>>     SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
>>     SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
>>     SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
>>     SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
>>     SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
>>     SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
>>     SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
>>     SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
>>     SPI_InitStructure.SPI_CRCPolynomial = 7;
>>     SPI_Init(SPIy, &SPI_InitStructure);
>>
>>     // Enable SPIy
>>     SPI_Cmd(SPIy, ENABLE);
>>
>>     //-----------------------------------------------------------------
>>     while (1)
>>     {
>>         GPIO_WriteBit(SPIy_GPIO, SPIy_PIN_NSS, 0);
>>
>>         while (SPI_I2S_GetFlagStatus(SPIy, SPI_I2S_FLAG_TXE) ==
>> RESET); // Wait for SPIy Tx buffer empty
>>         //while (SPI_I2S_GetFlagStatus(SPIy, SPI_I2S_FLAG_BSY) ==
>> SET); // Wait for SPIy ready
>>         SPI_I2S_SendData(SPIy, 0x82);   // Send SPIy test databyte
>>
>>         GPIO_WriteBit(SPIy_GPIO, SPIy_PIN_NSS, 1);
>>         Delay_ms(100);
>>     }
>> }
>>
>> -----------------------------------------
>>           elektro[-flame|-etc]
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