* 设置时钟 * @spi_base 基地址 * @max_hz 最大频率，单位hz */
| 135 | * @max_hz 最大频率，单位hz |
| 136 | */ |
| 137 | void ls1c_spi_set_clock(void *spi_base, unsigned long max_hz) |
| 138 | { |
| 139 | unsigned int div = 0; |
| 140 | unsigned char val = 0; |
| 141 | |
| 142 | // 获取分频系数 |
| 143 | div = ls1c_spi_get_div(max_hz); |
| 144 | |
| 145 | // 设置spr |
| 146 | val = reg_read_8(spi_base + LS1C_SPI_SPCR_OFFSET); |
| 147 | val &= (~LS1C_SPI_SPCR_SPR_MASK); // spr清零 |
| 148 | val |= (div & LS1C_SPI_SPCR_SPR_MASK); // 设置新的spr |
| 149 | reg_write_8(val, spi_base + LS1C_SPI_SPCR_OFFSET); |
| 150 | |
| 151 | // 设置spre |
| 152 | val = reg_read_8(spi_base + LS1C_SPI_SPER_OFFSET); |
| 153 | val &= (~LS1C_SPI_SPER_SPRE_MASK); // spre清零 |
| 154 | val |= ((div >> 2) & LS1C_SPI_SPER_SPRE_MASK); // 设置新的spre |
| 155 | reg_write_8(val, spi_base + LS1C_SPI_SPER_OFFSET); |
| 156 | |
| 157 | return ; |
| 158 | } |
| 159 | |
| 160 | |
| 161 | /* |
no test coverage detected