74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
#include "main.h"
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#include "mcp41x.h"
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static uint32_t pot_value[MCP41X_RES_MAX] = {10000, 50000, 100000};
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static void mcp41x_transmit(mcp41x_handle_t *hpot, uint8_t *data)
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{
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HAL_GPIO_WritePin(hpot->cs_port, hpot->cs_pin, GPIO_PIN_RESET);
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HAL_SPI_Transmit(hpot->hspi, data, 2, 1);
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HAL_GPIO_WritePin(hpot->cs_port, hpot->cs_pin, GPIO_PIN_SET);
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}
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void mcp41x_init(mcp41x_handle_t *hpot, SPI_HandleTypeDef *hspi, GPIO_TypeDef *cs_port, uint16_t cs_pin, mcp41x_res_t res)
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{
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hpot->hspi = hspi;
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hpot->cs_port = cs_port;
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hpot->cs_pin = cs_pin;
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hpot->max_res = res;
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hpot->dir = MCP41X_ATOB;
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}
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void mcp41x_setValue(mcp41x_handle_t *hpot, uint8_t value)
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{
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if (hpot->dir == MCP41X_BTOA)
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{
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value = 255 - value;
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}
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hpot->value = value;
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uint8_t data[2] = {MCP41X_WRITE0, value};
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mcp41x_transmit(hpot, data);
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}
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void mcp41x_setVolume(mcp41x_handle_t *hpot, uint8_t volume)
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{
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if (volume > 100)
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{
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volume = 100;
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}
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uint32_t value = volume * 255U / 100U;
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mcp41x_setValue(hpot, value);
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}
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uint8_t mcp41x_getVolume(mcp41x_handle_t *hpot)
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{
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return hpot->value * 100U / 255U;
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}
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void mcp41x_setResistance(mcp41x_handle_t *hpot, uint32_t resistance)
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{
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if (resistance > pot_value[hpot->max_res])
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{
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resistance = pot_value[hpot->max_res];
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}
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uint32_t value = resistance * 255U / pot_value[hpot->max_res];
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mcp41x_setValue(hpot, value);
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}
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uint32_t mcp41x_getResistance(mcp41x_handle_t *hpot)
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{
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return hpot->value * pot_value[hpot->max_res] / 255;
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}
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void mcp41x_setWiperDir(mcp41x_handle_t *hpot, mcp41x_dir_t dir)
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{
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hpot->dir = dir;
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}
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void mcp41x_sleep(mcp41x_handle_t *hpot)
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{
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uint8_t data[2] = {MCP41X_SLEEP, 0};
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mcp41x_transmit(hpot, data);
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} |