stm32F4驱动MCP41010
时间: 2023-10-30 21:07:12 浏览: 288
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MCP41010是一款数字电位器,其控制接口使用SPI协议。要使用STM32F4驱动MCP41010,需要连接MCP41010的SDI、SCLK和CS引脚到STM32F4的SPI引脚,并初始化SPI模块。
以下是一个简单的代码示例,可以将MCP41010的第0通道的电阻值设置为50:
```c
#include "stm32f4xx.h"
#define CS_GPIO_Port GPIOA
#define CS_Pin GPIO_PIN_4
void MCP41010_Write(uint8_t channel, uint8_t value)
{
uint8_t data[2];
data[0] = 0x00 | channel;
data[1] = value;
HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi1, data, 2, HAL_MAX_DELAY);
HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_SET);
}
int main(void)
{
HAL_Init();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_SPI1_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = CS_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(CS_GPIO_Port, &GPIO_InitStruct);
SPI_HandleTypeDef hspi1 = {0};
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 7;
HAL_SPI_Init(&hspi1);
MCP41010_Write(0, 50);
while (1)
{
}
}
```
在这个示例中,使用STM32F4的SPI1模块,将CS引脚连接到PA4引脚。在初始化SPI模块之后,使用MCP41010_Write函数将第0通道的电阻值设置为50。在主循环中不做任何事情,程序将一直运行。
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